chandan mondal | College of the Mainland (original) (raw)

Papers by chandan mondal

Research paper thumbnail of Effect of heat treatment on the behavior of an AA7055 aluminum alloy during ballistic impact

International Journal of Impact Engineering, 2011

Effect of heat treatment on mechanical properties and ballistic resistance of AA 7055 aluminum al... more Effect of heat treatment on mechanical properties and ballistic resistance of AA 7055 aluminum alloy plates has been studied. Large differences in the static mechanical properties are observed in the plates subjected to three different heat treatment schedules namely under-aging, peak aging and over-aging.

Research paper thumbnail of Formation of a single, rotated-Brass {1 1 0}〈5 5 6〉 texture by hot cross-rolling of an Al–Zn–Mg–Cu–Zr alloy

Thin-walled Structures, 2011

The present work describes the evolution of a strong, single-component rotated-Brass ({1 1 0}h5 5... more The present work describes the evolution of a strong, single-component rotated-Brass ({1 1 0}h5 5 6i) texture in an Al-Zn-Mg-Cu-Zr alloy by an uneven hot cross-rolling with frequent interpass annealing. This texture development is unique because hot rolling of aluminum alloys results in orientation distribution along the "b-fibre". It has been demonstrated that the deformation by cross-rolling of a partially recrystallized grain structure having rotated-Cube and Goss orientations, and the recrystallization resistance of near-Brass-oriented elongated grains play a critical role in development of this texture.

Research paper thumbnail of On the nature of T(Al 2Mg 3Zn 3) and S(Al 2CuMg) phases present in as-cast and annealed 7055 aluminum alloy

Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2005

Aluminum alloys, encompassed by AA 7055 alloy composition, having the nominal zinc content (i.e. ... more Aluminum alloys, encompassed by AA 7055 alloy composition, having the nominal zinc content (i.e. 8 wt.%) but varying copper and magnesium contents across the alloy composition range were examined in the as-cast form by a combination of light microscopy, scanning electron microscopy (SEM), electron probe micro analysis (EPMA) and X-ray diffraction (XRD). It is observed that for all compositions, the second phases based on (MgZn 2 ), T(Al 2 Mg 3 Zn 3 ) and S(Al 2 CuMg) are present. The T phase dissolves copper up to 28 wt.%, whilst the S phase shows metastable solubility of zinc that may range up to 30 wt.%. In alloys with magnesium at the lower limit and the copper contents approaching the upper limit of the alloy composition, the phase (Al 2 Cu) of the constituent binary Al-Cu system is further observed. The phase (Al 2 Cu) does not dissolve either zinc or magnesium. Below the nominal composition, the alloys could be homogenized substantially using a commercially viable homogenization treatment leaving small amounts of undissolved S phase that does not contain any zinc.

Research paper thumbnail of Tensile properties of peak aged 7055 aluminum alloy extrusions

Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2007

In 7055 aluminum alloy, the optimization of alloy composition, extrusion processing parameters an... more In 7055 aluminum alloy, the optimization of alloy composition, extrusion processing parameters and peak aging treatment results in reproducible, minimum tensile properties of 0.2% P.S. = 724 MPa, UTS = 745 MPa and elongation = 12.6%.

Research paper thumbnail of Extrusion Processing of High-Strength Al Alloy 7055

Materials and Manufacturing Processes, 2007

The effects of a combination of extrusion processing parameters and aging schedules on the micros... more The effects of a combination of extrusion processing parameters and aging schedules on the microstructure and mechanical properties of the 7055 Al alloy were investigated. A safe extrusion processing zone is determined through a limit diagram constructed over the experimental initial billet temperature ranging from 380° to 420°C, extrusion ratio from 10:1 to 40:1, and the ram speed ranging from 1 to 15 mm s−1. Microstructural characterization of as-extruded, solution-treated, and artificially-aged materials was carried out using polarized light microscopy (for grain structure) and transmission electron microscopy (for precipitate morphology). A combination of hardness and tensile tests was used to evaluate mechanical properties. It is shown that in 7055 Al alloy, the optimization of alloy composition, extrusion processing parameters, and peak aging treatment results in reproducible tensile properties of 0.2% P.S. = 725 MPa, UTS = 750 MPa, and % elongation = 12.9. In order to improve the stress-corrosion resistance of peak aged material, retrogression and reaging (RRA) temper was established. A strength-electrical conductivity relationship has been established for the RRA temper between 36% and 37% International Annealed Copper Standard (IACS) electrical conductivity to enable selection of suitable combination of properties.

Research paper thumbnail of Effect of heat treatment on the behavior of an AA7055 aluminum alloy during ballistic impact

International Journal of Impact Engineering, 2011

Effect of heat treatment on mechanical properties and ballistic resistance of AA 7055 aluminum al... more Effect of heat treatment on mechanical properties and ballistic resistance of AA 7055 aluminum alloy plates has been studied. Large differences in the static mechanical properties are observed in the plates subjected to three different heat treatment schedules namely under-aging, peak aging and over-aging.

Research paper thumbnail of Formation of a single, rotated-Brass {1 1 0}〈5 5 6〉 texture by hot cross-rolling of an Al–Zn–Mg–Cu–Zr alloy

Thin-walled Structures, 2011

The present work describes the evolution of a strong, single-component rotated-Brass ({1 1 0}h5 5... more The present work describes the evolution of a strong, single-component rotated-Brass ({1 1 0}h5 5 6i) texture in an Al-Zn-Mg-Cu-Zr alloy by an uneven hot cross-rolling with frequent interpass annealing. This texture development is unique because hot rolling of aluminum alloys results in orientation distribution along the "b-fibre". It has been demonstrated that the deformation by cross-rolling of a partially recrystallized grain structure having rotated-Cube and Goss orientations, and the recrystallization resistance of near-Brass-oriented elongated grains play a critical role in development of this texture.

Research paper thumbnail of On the nature of T(Al 2Mg 3Zn 3) and S(Al 2CuMg) phases present in as-cast and annealed 7055 aluminum alloy

Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2005

Aluminum alloys, encompassed by AA 7055 alloy composition, having the nominal zinc content (i.e. ... more Aluminum alloys, encompassed by AA 7055 alloy composition, having the nominal zinc content (i.e. 8 wt.%) but varying copper and magnesium contents across the alloy composition range were examined in the as-cast form by a combination of light microscopy, scanning electron microscopy (SEM), electron probe micro analysis (EPMA) and X-ray diffraction (XRD). It is observed that for all compositions, the second phases based on (MgZn 2 ), T(Al 2 Mg 3 Zn 3 ) and S(Al 2 CuMg) are present. The T phase dissolves copper up to 28 wt.%, whilst the S phase shows metastable solubility of zinc that may range up to 30 wt.%. In alloys with magnesium at the lower limit and the copper contents approaching the upper limit of the alloy composition, the phase (Al 2 Cu) of the constituent binary Al-Cu system is further observed. The phase (Al 2 Cu) does not dissolve either zinc or magnesium. Below the nominal composition, the alloys could be homogenized substantially using a commercially viable homogenization treatment leaving small amounts of undissolved S phase that does not contain any zinc.

Research paper thumbnail of Tensile properties of peak aged 7055 aluminum alloy extrusions

Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2007

In 7055 aluminum alloy, the optimization of alloy composition, extrusion processing parameters an... more In 7055 aluminum alloy, the optimization of alloy composition, extrusion processing parameters and peak aging treatment results in reproducible, minimum tensile properties of 0.2% P.S. = 724 MPa, UTS = 745 MPa and elongation = 12.6%.

Research paper thumbnail of Extrusion Processing of High-Strength Al Alloy 7055

Materials and Manufacturing Processes, 2007

The effects of a combination of extrusion processing parameters and aging schedules on the micros... more The effects of a combination of extrusion processing parameters and aging schedules on the microstructure and mechanical properties of the 7055 Al alloy were investigated. A safe extrusion processing zone is determined through a limit diagram constructed over the experimental initial billet temperature ranging from 380° to 420°C, extrusion ratio from 10:1 to 40:1, and the ram speed ranging from 1 to 15 mm s−1. Microstructural characterization of as-extruded, solution-treated, and artificially-aged materials was carried out using polarized light microscopy (for grain structure) and transmission electron microscopy (for precipitate morphology). A combination of hardness and tensile tests was used to evaluate mechanical properties. It is shown that in 7055 Al alloy, the optimization of alloy composition, extrusion processing parameters, and peak aging treatment results in reproducible tensile properties of 0.2% P.S. = 725 MPa, UTS = 750 MPa, and % elongation = 12.9. In order to improve the stress-corrosion resistance of peak aged material, retrogression and reaging (RRA) temper was established. A strength-electrical conductivity relationship has been established for the RRA temper between 36% and 37% International Annealed Copper Standard (IACS) electrical conductivity to enable selection of suitable combination of properties.