Jui-Chao Kuo | National Cheng Kung University (original) (raw)

Papers by Jui-Chao Kuo

Research paper thumbnail of Correlation between Orientation Spread and Ear Forming of As-Annealed AA5151 Aluminum Alloy

Materials

In the present work, we take the influences of activated slip systems and the orientation spread ... more In the present work, we take the influences of activated slip systems and the orientation spread into account to predict the cup height using analytical earing models and compare the predicted results with experimental results. The effect of boundary conditions of the various stress states and the work hardening exponents are compared and discussed for profile of single crystals. A stress ratio of −0.3 and a hardening exponent of 0.3 are selected for the prediction of earing profiles. The combination of activation of the single slip systems and orientation spread provides the best prediction of deep-drawing profiles. With further consideration of the orientation spread, an increase in the total orientation leads to peak-broadening, i.e., broad and smooth ears. Furthermore, the difference of the height between the maximum and minimum value of cup profiles is reduced because of the orientation spread. The profile for C is found with single ear at 45°, while the other components indivi...

Research paper thumbnail of Calibration of the image distortion induced error of plane strain field measured using digital image correlation technique

Las Palmas de Gran Canaria, Spain, Sep 1, 2006

ABSTRACT

Research paper thumbnail of Article Grain Boundary Evolution of Cold-Rolled FePd Alloy during Recrystallization at Disordering Temperature

In this study, the grain boundary character and texture of 50% and 90% cold-rolled FePd alloy was... more In this study, the grain boundary character and texture of 50% and 90% cold-rolled FePd alloy was investigated during recrystallization at 700 °C. Electron backscatter diffraction (EBSD) measurements were performed on the rolling direction to normal direction section. Kernel average misorientation (KAM) calculated from EBSD measurements was employed to determine the recrystallization fraction. The Avrami exponent n of recrystallization is 1.9 and 4.9 for 50% and 90% cold rolling, respectively. The new formation of texture reveals random texture during the recrystallization process. As annealing time increased, the number of high angle boundary (HAGB) and coincidence site lattice (CSL) increased with consumption of low angle boundary (LAGB). In addition, possible transformations between different grain boundaries are observed here.

Research paper thumbnail of Effect of Deformation on Crystallographic Texture in Cold-Rolled FePd Alloy

Research paper thumbnail of Effect of Stacking Fault Energy on Cold-Rolling Texture and Microstructure of FCC Metals

Research paper thumbnail of On the Pile-Up and Sink-in Behavior of Indented Nickel Considering Dislocation Structures

Experimental Mechanics

Background: Surface topography of pileup and sink-in is an issue of strain-hardening behavior aro... more Background: Surface topography of pileup and sink-in is an issue of strain-hardening behavior around pyramidal and spherical indentations. The relationship between the surface profile and the activated dislocations is not clearly understood. Objective: This study combined electron channeling contrast imaging (ECCI), electron backscatter diffraction-based (EBSD) techniques and 3D laser microscopy to visualize the stress field and understand the influence of activated dislocations on the surface topography around an indent. Methods: The dislocation structures were identified using ECCI and geometrically necessary dislocation à , and 111 À Á 101  Ã. Conclusions: The surface profile reveals a combination of pileup and sink-in patterns resulting in the activated dislocations, where the deformation around the indent is dominated by screw-type dislocations.

Research paper thumbnail of Microstructure and Deformation Characteristics of MnS in 1215MS Steel at 1050°C

Research paper thumbnail of Application of Electron Channeling Contrast Image on Analysis of Dislocation Structures Induced by Indentation in Nickel Single Crystal

Research paper thumbnail of On the Passive Role of Grain Boundaries in Deformation Processing

Research paper thumbnail of Study on the deformation behaviour of aluminium bicrystals by use of image correlation photogrammetry

Research paper thumbnail of Effect of Pulse Plating Frequency on Electrical and Mechanical Properties of Electrodeposited Copper Films

Research paper thumbnail of Characterizing the Grain boundary Effect in Bicrystal Deformation

Research paper thumbnail of Control of Uni-Directional Growth of Η-Cu 6 SN 5 in Microbumps on ( 111 ) Oriented and Nanotwinned Cu

The growth of η and η’-Cu6Sn5 has been proven as a preferential growth behavior on single crystal... more The growth of η and η’-Cu6Sn5 has been proven as a preferential growth behavior on single crystal copper. However, a layer of single crystal copper is not possible to be electroplated. It can not be utilized in the electronic industry. In this paper, we electroplated an array of (111) uni-directional Cu pad followed by electroplating SnAg2.3. After being reflowed at 260C for 1 minute, the η-Cu6Sn5 showed a preferential growth to (0001) plane. As reflow time extended, the preferential growth behavior would change. The intensity of (0001) decreased while that of (2 3) increased. It means the preferential growth of η-Cu6Sn5 would change during reflow. Eventually, the preferred orientation of η-Cu6Sn5 changed to (2 3) after 5 minutes of reflowing. It is also found that this preferential growth behavior of Cu6Sn5 would be affected by the quality of (111) uni-directional Cu.

Research paper thumbnail of Effects of bismuth additions on mechanical property and microstructure of SAC-Bi solder joint under current stressing

Microelectronics Reliability, 2021

We are concerned with the study of some classical spectral collocation methods as well as with th... more We are concerned with the study of some classical spectral collocation methods as well as with the new software system Chebfun in computing high order eigenpairs of singular and regular Schrödinger eigenproblems. We want to highlight both the qualities as well as the shortcomings of these methods and evaluate them in conjunction with the usual ones. In order to resolve a boundary singularity we use Chebfun with domain truncation. Although it is applicable with spectral collocation, a special technique to introduce boundary conditions as well as a coordinate transform, which maps an unbounded domain to a finite one, are the special ingredients. A challenging set of "hard"benchmark problems, for which usual numerical methods (f. d., f. e. m., shooting etc.) fail, are analyzed. In order to separate "good"and "bad"eigenvalues we estimate the drift of the set of eigenvalues of interest with respect to the order of approximation and/or scaling of domain parameter. It automatically provides us with a measure of the error within which the eigenvalues are computed and a hint on numerical stability. We pay a particular attention to problems with almost multiple eigenvalues as well as to problems with a mixed spectrum.

Research paper thumbnail of Role of phase transformation in possible wear mechanisms in silicon microelectromechanical-system devices

Materials Chemistry and Physics, 2020

Research paper thumbnail of Fabrication of Electrodeposited Iron-Palladium Films

ECS Meeting Abstracts, 2009

Research paper thumbnail of Formation of Black Striped Oxide Scale on Hot-Rolled Si-Containing Carbon Steel

MATERIALS TRANSACTIONS, 2018

Research paper thumbnail of Resolution of transmission electron backscatter diffraction in aluminum and silver: Effect of the atomic number

Ultramicroscopy, 2018

This work aims to investigate the influence of intrinsic and extrinsic factors on the physical re... more This work aims to investigate the influence of intrinsic and extrinsic factors on the physical resolution of the transmission electron backscattered diffraction technique (t-EBSD) in aluminum and silver. Here, we focus on the intrinsic factors, namely, atomic number and thickness of the specimen, and extrinsic set-up factors, which include the electron beam voltage, working distance, and specimen tilt. The working distance and tilt angle, which are selected as 12 mm and 60° for Al and 12 mm and 50° for Ag, respectively, reveal a sharp pattern with high contrast. The physical resolutions at the lateral and longitudinal directions depend on the depth resolution. The depth and lateral and longitudinal resolutions increase in Al but decrease in Ag with increased accelerating voltage. The decrease in specimen thickness for Al and Ag from 400 nm to 100 nm reduces the lateral and longitudinal resolutions. The most ideal depth and lateral and longitudinal resolutions obtained under a thickness of 100 nm are 22.7, 18.9, and 33.7 nm at 30 kV for Ag and 34.7, 22.8, and 36.6 nm at 15 kV for Al, respectively.

Research paper thumbnail of A new method for detection of single nucleotide polymorphism in a female reproduction-associated gene, tmigd1, of Anas platyrhynchos using a strip biosensor with gold nanoparticles

Poultry Science, 2018

In this study, we first reported a lateral flow assay combined with primer extension (PEXT) and g... more In this study, we first reported a lateral flow assay combined with primer extension (PEXT) and gold nanoparticles for single-nucleotide polymorphism (SNP) genotyping of the tmigd1 gene of the Tsaiya ducks (Anas platyrhynchos), which has the advantages of simplicity of operation, cost-effectiveness, and time-saving. Gold nanoparticles were tailed with thiol-thymine oligodeoxyribonucleotides (thiol-(dT)30) using the salt-aging method at 25°C and used as a label in a lateral flow assay. The lateral flow device was composed of test and control zones on a nitrocellulose membrane containing streptavidin and adenosine oligodeoxyribonucleotides ((dA)30), respectively. When the specific SNP existed, the corresponding primers were extended, and the reaction product was captured by streptavidin at the test zone owing to the introduction of biotin-deoxyuridine triphosphate (biotin-dUTP) into the reaction product during PEXT. Gold nanoparticles hybridized with the reaction product to render it visible. Here, we developed a new system for detection of single nucleotide polymorphism in a female reproduction-associated gene, tmigd1, of Anas platyrhynchos using the strip biosensor, and identified the optimized parameters for the concentration of Mg2+ in the PEXT reaction and the amount of streptavidin used on membranes for signal specificity.

Research paper thumbnail of Effects of Mg-Al-O-Mn-S inclusion on the nucleation of acicular ferrite in magnesium-containing low-carbon steel

Materials Characterization, 2018

Abstract The effects of inclusion size and chemical composition on acicular ferrite (AF) nucleati... more Abstract The effects of inclusion size and chemical composition on acicular ferrite (AF) nucleation and possible nucleation mechanisms were discussed. With the use of low-carbon structure steel containing 13 ppm Mg, the chemical composition and size of inclusions were quantified by scanning electron microscopy combined with an energy dispersive spectroscopy system. Results showed that the complex inclusions MgO-MnS and MgO-Al2O3-MnS are the most effective inclusions for inducing AF nucleation in Mg-containing A36, and their probabilities of AF nucleation are 35.8% and 41.4%, respectively. Moreover, the inclusion size in the range of 1–2 μm exhibits the most remarkable ability to induce AF formation. AF nucleates at the interface of MgO and MgO-Al2O3 because of the low lattice misfit with AF. Complex inclusions, such as MgO-MnS and MgO-Al2O3-MnS, present a better ability of inducing AF formation than that of MnS due to the Mn-depleted zone.

Research paper thumbnail of Correlation between Orientation Spread and Ear Forming of As-Annealed AA5151 Aluminum Alloy

Materials

In the present work, we take the influences of activated slip systems and the orientation spread ... more In the present work, we take the influences of activated slip systems and the orientation spread into account to predict the cup height using analytical earing models and compare the predicted results with experimental results. The effect of boundary conditions of the various stress states and the work hardening exponents are compared and discussed for profile of single crystals. A stress ratio of −0.3 and a hardening exponent of 0.3 are selected for the prediction of earing profiles. The combination of activation of the single slip systems and orientation spread provides the best prediction of deep-drawing profiles. With further consideration of the orientation spread, an increase in the total orientation leads to peak-broadening, i.e., broad and smooth ears. Furthermore, the difference of the height between the maximum and minimum value of cup profiles is reduced because of the orientation spread. The profile for C is found with single ear at 45°, while the other components indivi...

Research paper thumbnail of Calibration of the image distortion induced error of plane strain field measured using digital image correlation technique

Las Palmas de Gran Canaria, Spain, Sep 1, 2006

ABSTRACT

Research paper thumbnail of Article Grain Boundary Evolution of Cold-Rolled FePd Alloy during Recrystallization at Disordering Temperature

In this study, the grain boundary character and texture of 50% and 90% cold-rolled FePd alloy was... more In this study, the grain boundary character and texture of 50% and 90% cold-rolled FePd alloy was investigated during recrystallization at 700 °C. Electron backscatter diffraction (EBSD) measurements were performed on the rolling direction to normal direction section. Kernel average misorientation (KAM) calculated from EBSD measurements was employed to determine the recrystallization fraction. The Avrami exponent n of recrystallization is 1.9 and 4.9 for 50% and 90% cold rolling, respectively. The new formation of texture reveals random texture during the recrystallization process. As annealing time increased, the number of high angle boundary (HAGB) and coincidence site lattice (CSL) increased with consumption of low angle boundary (LAGB). In addition, possible transformations between different grain boundaries are observed here.

Research paper thumbnail of Effect of Deformation on Crystallographic Texture in Cold-Rolled FePd Alloy

Research paper thumbnail of Effect of Stacking Fault Energy on Cold-Rolling Texture and Microstructure of FCC Metals

Research paper thumbnail of On the Pile-Up and Sink-in Behavior of Indented Nickel Considering Dislocation Structures

Experimental Mechanics

Background: Surface topography of pileup and sink-in is an issue of strain-hardening behavior aro... more Background: Surface topography of pileup and sink-in is an issue of strain-hardening behavior around pyramidal and spherical indentations. The relationship between the surface profile and the activated dislocations is not clearly understood. Objective: This study combined electron channeling contrast imaging (ECCI), electron backscatter diffraction-based (EBSD) techniques and 3D laser microscopy to visualize the stress field and understand the influence of activated dislocations on the surface topography around an indent. Methods: The dislocation structures were identified using ECCI and geometrically necessary dislocation à , and 111 À Á 101  Ã. Conclusions: The surface profile reveals a combination of pileup and sink-in patterns resulting in the activated dislocations, where the deformation around the indent is dominated by screw-type dislocations.

Research paper thumbnail of Microstructure and Deformation Characteristics of MnS in 1215MS Steel at 1050°C

Research paper thumbnail of Application of Electron Channeling Contrast Image on Analysis of Dislocation Structures Induced by Indentation in Nickel Single Crystal

Research paper thumbnail of On the Passive Role of Grain Boundaries in Deformation Processing

Research paper thumbnail of Study on the deformation behaviour of aluminium bicrystals by use of image correlation photogrammetry

Research paper thumbnail of Effect of Pulse Plating Frequency on Electrical and Mechanical Properties of Electrodeposited Copper Films

Research paper thumbnail of Characterizing the Grain boundary Effect in Bicrystal Deformation

Research paper thumbnail of Control of Uni-Directional Growth of Η-Cu 6 SN 5 in Microbumps on ( 111 ) Oriented and Nanotwinned Cu

The growth of η and η’-Cu6Sn5 has been proven as a preferential growth behavior on single crystal... more The growth of η and η’-Cu6Sn5 has been proven as a preferential growth behavior on single crystal copper. However, a layer of single crystal copper is not possible to be electroplated. It can not be utilized in the electronic industry. In this paper, we electroplated an array of (111) uni-directional Cu pad followed by electroplating SnAg2.3. After being reflowed at 260C for 1 minute, the η-Cu6Sn5 showed a preferential growth to (0001) plane. As reflow time extended, the preferential growth behavior would change. The intensity of (0001) decreased while that of (2 3) increased. It means the preferential growth of η-Cu6Sn5 would change during reflow. Eventually, the preferred orientation of η-Cu6Sn5 changed to (2 3) after 5 minutes of reflowing. It is also found that this preferential growth behavior of Cu6Sn5 would be affected by the quality of (111) uni-directional Cu.

Research paper thumbnail of Effects of bismuth additions on mechanical property and microstructure of SAC-Bi solder joint under current stressing

Microelectronics Reliability, 2021

We are concerned with the study of some classical spectral collocation methods as well as with th... more We are concerned with the study of some classical spectral collocation methods as well as with the new software system Chebfun in computing high order eigenpairs of singular and regular Schrödinger eigenproblems. We want to highlight both the qualities as well as the shortcomings of these methods and evaluate them in conjunction with the usual ones. In order to resolve a boundary singularity we use Chebfun with domain truncation. Although it is applicable with spectral collocation, a special technique to introduce boundary conditions as well as a coordinate transform, which maps an unbounded domain to a finite one, are the special ingredients. A challenging set of "hard"benchmark problems, for which usual numerical methods (f. d., f. e. m., shooting etc.) fail, are analyzed. In order to separate "good"and "bad"eigenvalues we estimate the drift of the set of eigenvalues of interest with respect to the order of approximation and/or scaling of domain parameter. It automatically provides us with a measure of the error within which the eigenvalues are computed and a hint on numerical stability. We pay a particular attention to problems with almost multiple eigenvalues as well as to problems with a mixed spectrum.

Research paper thumbnail of Role of phase transformation in possible wear mechanisms in silicon microelectromechanical-system devices

Materials Chemistry and Physics, 2020

Research paper thumbnail of Fabrication of Electrodeposited Iron-Palladium Films

ECS Meeting Abstracts, 2009

Research paper thumbnail of Formation of Black Striped Oxide Scale on Hot-Rolled Si-Containing Carbon Steel

MATERIALS TRANSACTIONS, 2018

Research paper thumbnail of Resolution of transmission electron backscatter diffraction in aluminum and silver: Effect of the atomic number

Ultramicroscopy, 2018

This work aims to investigate the influence of intrinsic and extrinsic factors on the physical re... more This work aims to investigate the influence of intrinsic and extrinsic factors on the physical resolution of the transmission electron backscattered diffraction technique (t-EBSD) in aluminum and silver. Here, we focus on the intrinsic factors, namely, atomic number and thickness of the specimen, and extrinsic set-up factors, which include the electron beam voltage, working distance, and specimen tilt. The working distance and tilt angle, which are selected as 12 mm and 60° for Al and 12 mm and 50° for Ag, respectively, reveal a sharp pattern with high contrast. The physical resolutions at the lateral and longitudinal directions depend on the depth resolution. The depth and lateral and longitudinal resolutions increase in Al but decrease in Ag with increased accelerating voltage. The decrease in specimen thickness for Al and Ag from 400 nm to 100 nm reduces the lateral and longitudinal resolutions. The most ideal depth and lateral and longitudinal resolutions obtained under a thickness of 100 nm are 22.7, 18.9, and 33.7 nm at 30 kV for Ag and 34.7, 22.8, and 36.6 nm at 15 kV for Al, respectively.

Research paper thumbnail of A new method for detection of single nucleotide polymorphism in a female reproduction-associated gene, tmigd1, of Anas platyrhynchos using a strip biosensor with gold nanoparticles

Poultry Science, 2018

In this study, we first reported a lateral flow assay combined with primer extension (PEXT) and g... more In this study, we first reported a lateral flow assay combined with primer extension (PEXT) and gold nanoparticles for single-nucleotide polymorphism (SNP) genotyping of the tmigd1 gene of the Tsaiya ducks (Anas platyrhynchos), which has the advantages of simplicity of operation, cost-effectiveness, and time-saving. Gold nanoparticles were tailed with thiol-thymine oligodeoxyribonucleotides (thiol-(dT)30) using the salt-aging method at 25°C and used as a label in a lateral flow assay. The lateral flow device was composed of test and control zones on a nitrocellulose membrane containing streptavidin and adenosine oligodeoxyribonucleotides ((dA)30), respectively. When the specific SNP existed, the corresponding primers were extended, and the reaction product was captured by streptavidin at the test zone owing to the introduction of biotin-deoxyuridine triphosphate (biotin-dUTP) into the reaction product during PEXT. Gold nanoparticles hybridized with the reaction product to render it visible. Here, we developed a new system for detection of single nucleotide polymorphism in a female reproduction-associated gene, tmigd1, of Anas platyrhynchos using the strip biosensor, and identified the optimized parameters for the concentration of Mg2+ in the PEXT reaction and the amount of streptavidin used on membranes for signal specificity.

Research paper thumbnail of Effects of Mg-Al-O-Mn-S inclusion on the nucleation of acicular ferrite in magnesium-containing low-carbon steel

Materials Characterization, 2018

Abstract The effects of inclusion size and chemical composition on acicular ferrite (AF) nucleati... more Abstract The effects of inclusion size and chemical composition on acicular ferrite (AF) nucleation and possible nucleation mechanisms were discussed. With the use of low-carbon structure steel containing 13 ppm Mg, the chemical composition and size of inclusions were quantified by scanning electron microscopy combined with an energy dispersive spectroscopy system. Results showed that the complex inclusions MgO-MnS and MgO-Al2O3-MnS are the most effective inclusions for inducing AF nucleation in Mg-containing A36, and their probabilities of AF nucleation are 35.8% and 41.4%, respectively. Moreover, the inclusion size in the range of 1–2 μm exhibits the most remarkable ability to induce AF formation. AF nucleates at the interface of MgO and MgO-Al2O3 because of the low lattice misfit with AF. Complex inclusions, such as MgO-MnS and MgO-Al2O3-MnS, present a better ability of inducing AF formation than that of MnS due to the Mn-depleted zone.