Osman Ertorer | University of California, Davis (original) (raw)

Papers by Osman Ertorer

Research paper thumbnail of Cryomilled Commercially Pure Ti Consolidated via Spark Plasma Sintering

Research paper thumbnail of Synthesis and Microstructure of Bulk Nanostructured Cu by Spark Plasma Sintering of Cryomilled Powders

Research paper thumbnail of Synthesis of Bulk Nanostructured Cu via Spark Plasma Sintering and High Pressure Torsion of Cryomilled Powders

Research paper thumbnail of Additive Manufacturing and Post Processing of Alloy 22 by Laser Powder Bed Fusion

Research paper thumbnail of Processing, Microstructure and Mechanical Behavior of Cryomilled Commercially Pure Titanium

Metal matrix composites play an important role in automobiles, aerospace, sports and marine secto... more Metal matrix composites play an important role in automobiles, aerospace, sports and marine sector. In the present investigation, an attempt has been made to investigate the mechanical properties of Boron Carbide (B 4 C) particulates reinforced Al6262 alloy composites. Al6262 alloy was used as the base matrix. B 4 C particulates were used as reinforcement. The composites containing 4 wt. % of B 4 C particulates were fabricated by using liquid metallurgy route. The microstructures of the composites were examined by scanning electron microscopy. Further, tensile behaviour of as cast Al6262 alloy and 4 wt. % B 4 C composites were studied. Mechanical properties like hardness, ultimate tensile strength, yield strength and percentage elongation were evaluated as per ASTM standards. Microstructural observation revealed the uniform distribution of particles in the Al6262 alloy matrix. Further, it was found that the hardness, ultimate tensile strength and yield strength of composites were increased due to presence of boron carbide particle in the Al6262 alloy matrix. Percentage elongation of the composites decreased with addition of 4 wt. % of B 4 C particulates in soft Al alloy. Keywords-Al6262 Alloy, B 4 C particulates, Stir Casting, Hardness, Tensile Behaviour I. INTRODUCTION In the past, few years the global need for low cost, high performance and good quality materials has cause the shift in research from monolithic to composite materials. Aluminium is one of the major metals used in in the preparation of the metal matrix composites [1]. Aluminium alloys are broadly classified into wrought alloys and cast alloys. Major alloying elements in aluminium alloys are magnesium, copper, manganese, zinc and silicon. Aluminium alloys are frequently chosen as matrix because of their low density, good isotropic mechanical properties, high damping capacity, excellent corrosion resistance, and reasonable cost [2-4]. The replacement of conventional materials by lighter metals such as aluminium alloy is, therefore, highly required. However, aluminium alloys are not sufficiently stiff or strong for many applications so the composition of reinforcement is very much necessary. Therefore, the introduction of a hard-ceramic material into a metal matrix yields a composite material which results in a better combination of physical and mechanical properties that cannot be achieved alone with the matrix phase. Particle reinforced metal matrix composites are attractive for automotive and aeronautical application due to their high strength and low density [5, 6]. They are also interesting for their high temperature behaviour, good creep and wear resistance, also high stiffness than the base alloy. The most commonly used aluminium alloy matrices are

Research paper thumbnail of Enhanced tensile strength and high ductility in cryomilled commercially pure titanium

Scripta Materialia, 2009

ABSTRACT The room temperature tensile behavior of cryomilled and quasi-isostatically forged comme... more ABSTRACT The room temperature tensile behavior of cryomilled and quasi-isostatically forged commercially pure (CP)-Ti was investigated. Enhanced tensile strength (yield strength = 840 MPa, ultimate tensile strength = 902 MPa) in combination with high ductility (elongation to failure = 27.5%) was observed. This mechanical behavior is rationalized on the basis of processing history, microstructure (multimodal grain distribution, high-angle grain boundaries, high dislocation density) and chemistry. Relevant mechanisms are discussed and the results compared to those reported in earlier studies.

Research paper thumbnail of Mechanical Behavior of Cryomilled CP-Ti Consolidated via Quasi-Isostatic Forging

Metallurgical and Materials Transactions A-physical Metallurgy and Materials Science, 2009

Commercially pure (CP) Ti (Grade 2 with chemical composition 0.190 wt pct O, 0.0165 wt pct N, 0.0... more Commercially pure (CP) Ti (Grade 2 with chemical composition 0.190 wt pct O, 0.0165 wt pct N, 0.0030 wt pct C, and 0.013 wt pct Fe) was cryomilled in liquid argon and liquid nitrogen for 8 hours. The influence of the milling environment on the chemistry, grain size, and grain-boundary structure of CP-Ti was studied by means of transmission electron microscopy (TEM), X-ray diffraction (XRD), and chemical analysis. The

Research paper thumbnail of Nanostructured Ti Consolidated via Spark Plasma Sintering

Metallurgical and Materials Transactions A-physical Metallurgy and Materials Science, 2011

Cryomilled nanocrystalline commercially pure (CP)-Ti powders were spark plasma sintered (SPS) usi... more Cryomilled nanocrystalline commercially pure (CP)-Ti powders were spark plasma sintered (SPS) using different process parameters (heating rate, temperature, pressure, and dwell time) to study densification, microstructure, and mechanical behavior. The results were rationalized on the basis of the relevant literature and experimental results, and they reveal a strong dependence on SPS parameters. An interesting finding was that the measured high

Research paper thumbnail of Cryomilled Commercially Pure Ti Consolidated via Spark Plasma Sintering

Research paper thumbnail of Synthesis and Microstructure of Bulk Nanostructured Cu by Spark Plasma Sintering of Cryomilled Powders

Research paper thumbnail of Synthesis of Bulk Nanostructured Cu via Spark Plasma Sintering and High Pressure Torsion of Cryomilled Powders

Research paper thumbnail of Additive Manufacturing and Post Processing of Alloy 22 by Laser Powder Bed Fusion

Research paper thumbnail of Processing, Microstructure and Mechanical Behavior of Cryomilled Commercially Pure Titanium

Metal matrix composites play an important role in automobiles, aerospace, sports and marine secto... more Metal matrix composites play an important role in automobiles, aerospace, sports and marine sector. In the present investigation, an attempt has been made to investigate the mechanical properties of Boron Carbide (B 4 C) particulates reinforced Al6262 alloy composites. Al6262 alloy was used as the base matrix. B 4 C particulates were used as reinforcement. The composites containing 4 wt. % of B 4 C particulates were fabricated by using liquid metallurgy route. The microstructures of the composites were examined by scanning electron microscopy. Further, tensile behaviour of as cast Al6262 alloy and 4 wt. % B 4 C composites were studied. Mechanical properties like hardness, ultimate tensile strength, yield strength and percentage elongation were evaluated as per ASTM standards. Microstructural observation revealed the uniform distribution of particles in the Al6262 alloy matrix. Further, it was found that the hardness, ultimate tensile strength and yield strength of composites were increased due to presence of boron carbide particle in the Al6262 alloy matrix. Percentage elongation of the composites decreased with addition of 4 wt. % of B 4 C particulates in soft Al alloy. Keywords-Al6262 Alloy, B 4 C particulates, Stir Casting, Hardness, Tensile Behaviour I. INTRODUCTION In the past, few years the global need for low cost, high performance and good quality materials has cause the shift in research from monolithic to composite materials. Aluminium is one of the major metals used in in the preparation of the metal matrix composites [1]. Aluminium alloys are broadly classified into wrought alloys and cast alloys. Major alloying elements in aluminium alloys are magnesium, copper, manganese, zinc and silicon. Aluminium alloys are frequently chosen as matrix because of their low density, good isotropic mechanical properties, high damping capacity, excellent corrosion resistance, and reasonable cost [2-4]. The replacement of conventional materials by lighter metals such as aluminium alloy is, therefore, highly required. However, aluminium alloys are not sufficiently stiff or strong for many applications so the composition of reinforcement is very much necessary. Therefore, the introduction of a hard-ceramic material into a metal matrix yields a composite material which results in a better combination of physical and mechanical properties that cannot be achieved alone with the matrix phase. Particle reinforced metal matrix composites are attractive for automotive and aeronautical application due to their high strength and low density [5, 6]. They are also interesting for their high temperature behaviour, good creep and wear resistance, also high stiffness than the base alloy. The most commonly used aluminium alloy matrices are

Research paper thumbnail of Enhanced tensile strength and high ductility in cryomilled commercially pure titanium

Scripta Materialia, 2009

ABSTRACT The room temperature tensile behavior of cryomilled and quasi-isostatically forged comme... more ABSTRACT The room temperature tensile behavior of cryomilled and quasi-isostatically forged commercially pure (CP)-Ti was investigated. Enhanced tensile strength (yield strength = 840 MPa, ultimate tensile strength = 902 MPa) in combination with high ductility (elongation to failure = 27.5%) was observed. This mechanical behavior is rationalized on the basis of processing history, microstructure (multimodal grain distribution, high-angle grain boundaries, high dislocation density) and chemistry. Relevant mechanisms are discussed and the results compared to those reported in earlier studies.

Research paper thumbnail of Mechanical Behavior of Cryomilled CP-Ti Consolidated via Quasi-Isostatic Forging

Metallurgical and Materials Transactions A-physical Metallurgy and Materials Science, 2009

Commercially pure (CP) Ti (Grade 2 with chemical composition 0.190 wt pct O, 0.0165 wt pct N, 0.0... more Commercially pure (CP) Ti (Grade 2 with chemical composition 0.190 wt pct O, 0.0165 wt pct N, 0.0030 wt pct C, and 0.013 wt pct Fe) was cryomilled in liquid argon and liquid nitrogen for 8 hours. The influence of the milling environment on the chemistry, grain size, and grain-boundary structure of CP-Ti was studied by means of transmission electron microscopy (TEM), X-ray diffraction (XRD), and chemical analysis. The

Research paper thumbnail of Nanostructured Ti Consolidated via Spark Plasma Sintering

Metallurgical and Materials Transactions A-physical Metallurgy and Materials Science, 2011

Cryomilled nanocrystalline commercially pure (CP)-Ti powders were spark plasma sintered (SPS) usi... more Cryomilled nanocrystalline commercially pure (CP)-Ti powders were spark plasma sintered (SPS) using different process parameters (heating rate, temperature, pressure, and dwell time) to study densification, microstructure, and mechanical behavior. The results were rationalized on the basis of the relevant literature and experimental results, and they reveal a strong dependence on SPS parameters. An interesting finding was that the measured high