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Alan A Luo - One of the best experts on this subject based on the ideXlab platform.

  • in situ investigation on the microstructure evolution and plasticity of two magnesium Alloys during three point bending
    International Journal of Plasticity, 2015
    Co-Authors: Li Jin, Jie Sun, Jie Dong, Alan A Luo
    Abstract:

    Abstract Three-point bending represents important straining in metal forming, and is an ideal loading condition for in-situ investigation of complex microstructure evolution and plasticity of magnesium Alloys. Two extruded Alloys with different initial texture, AZ31 (Mg–3%Al–0.5%Zn 1 ) and Am30 (Mg–3%Al–0.3%Mn), were studied in three-point bending with in-situ electron backscatter diffraction (EBSD) observations, to reveal the role of strain gradient and deformation compatibility in the plasticity of magnesium Alloys. The results indicate that strain gradients in macro-scale from tension to compression can lead to a graded microstructure and texture evolution in the samples during bending. At the intergranular and intragranular levels, the volume fraction of twins was influenced by the slip-induced twinning behavior and strain compatibility among the surrounding grains except for Schmid factor relating to grain orientation. Slip-induced twinning behavior and its surrounding effects on the twinning volume fraction is much more profound in materials with weak textures. The Am30 Alloy with a weaker texture shows better deformation compatibility (and, thus, formability) during three-point bending compared to AZ31 Alloy with a stronger texture in this study.

  • effect of eutectic temperature on the extrudability of magnesium aluminum Alloys
    Scripta Materialia, 2012
    Co-Authors: Alan A Luo, C Zhang, Anil K Sachdev
    Abstract:

    The limited extrudability of AZ31 (Mg–3Al–1Zn) Alloy is reported to be caused by incipient melting of the Mg17Al12 binary phase with a eutectic temperature of 438 °C. Computational phase equilibria and microstructural examination, however, show that Mg–Al–Zn ternary phases with eutectic temperatures as low as 338 °C are actually present in the AZ31 Alloy, which is indeed the real limitation to its extrudability. The significantly improved extrudability of Am30 Alloy (Mg–3Al–0.3Mn) is due to the absence of these zinc-containing eutectic phases.

  • Development of a new wrought magnesium-aluminum-manganese Alloy Am30
    Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, 2007
    Co-Authors: Alan A Luo, Anil K Sachdev
    Abstract:

    A new wrought magnesium Alloy, Am30 (Mg-3 pct Al-0.4 pct Mn), has been developed. Compared to the current workhorse commercial wrought magnesium Alloy AZ31 (Mg-3 pct Al-1 pct Zn), the new Am30 Alloy has 20 to 50 pct higher maximum extrusion speed, up to 50 pct ductility improvement at temperatures up to 200 °C, with similar yield and tensile strengths. The tensile behavior of Am30 and AZ31 magnesium Alloy tubes suggests a moderate temperature forming range of 100 °C to 175 °C in which strain hardening offsets plastic instability until fracture by cavity coalescence occurs. The Am30 Alloy has slightly better formability than AZ31 at room and moderate temperatures, due to higher strain-hardening rates (dr/de) and exponents (n). Microstructural evaluation indicates that twinning is the major deformation mechanism for these Alloys at room and moderate temperatures in addition to slip mechanisms. Dynamic recrystallization (DRX) is observed at temperatures greater than ~150 °C, which causes local instabilities to occur, leading to failure.

Anil K Sachdev - One of the best experts on this subject based on the ideXlab platform.

  • effect of eutectic temperature on the extrudability of magnesium aluminum Alloys
    Scripta Materialia, 2012
    Co-Authors: Alan A Luo, C Zhang, Anil K Sachdev
    Abstract:

    The limited extrudability of AZ31 (Mg–3Al–1Zn) Alloy is reported to be caused by incipient melting of the Mg17Al12 binary phase with a eutectic temperature of 438 °C. Computational phase equilibria and microstructural examination, however, show that Mg–Al–Zn ternary phases with eutectic temperatures as low as 338 °C are actually present in the AZ31 Alloy, which is indeed the real limitation to its extrudability. The significantly improved extrudability of Am30 Alloy (Mg–3Al–0.3Mn) is due to the absence of these zinc-containing eutectic phases.

  • Development of a new wrought magnesium-aluminum-manganese Alloy Am30
    Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, 2007
    Co-Authors: Alan A Luo, Anil K Sachdev
    Abstract:

    A new wrought magnesium Alloy, Am30 (Mg-3 pct Al-0.4 pct Mn), has been developed. Compared to the current workhorse commercial wrought magnesium Alloy AZ31 (Mg-3 pct Al-1 pct Zn), the new Am30 Alloy has 20 to 50 pct higher maximum extrusion speed, up to 50 pct ductility improvement at temperatures up to 200 °C, with similar yield and tensile strengths. The tensile behavior of Am30 and AZ31 magnesium Alloy tubes suggests a moderate temperature forming range of 100 °C to 175 °C in which strain hardening offsets plastic instability until fracture by cavity coalescence occurs. The Am30 Alloy has slightly better formability than AZ31 at room and moderate temperatures, due to higher strain-hardening rates (dr/de) and exponents (n). Microstructural evaluation indicates that twinning is the major deformation mechanism for these Alloys at room and moderate temperatures in addition to slip mechanisms. Dynamic recrystallization (DRX) is observed at temperatures greater than ~150 °C, which causes local instabilities to occur, leading to failure.

Xunong Dong - One of the best experts on this subject based on the ideXlab platform.

  • Fatigue deformation characteristic of as-extruded Am30 magnesium Alloy
    Materials & Design, 2010
    Co-Authors: Tingwei Luo, Yuansheng Yang, W.h. Tong, Q.q. Duan, Xunong Dong
    Abstract:

    Abstract The fatigue deformation behavior of as-extruded Am30 magnesium Alloy has been investigated under different strain amplitudes in this paper, and the microstructure and fractograph during the cyclic deformation have been analyzed by use of the optical microscope (OM) and the scanning electronic microscope (SEM). The results show that there are many {1 0 –1 2} twins in the fatigue specimens of the extruded Am30 Alloy, and with the increase of total strain amplitude, the twins become coarser and longer. Otherwise, there are many twin bands composed of many tiny lenticular type twins ({1 0 –1 2}〈1 0 –1 1〉 twin) near the fatigue fracture, which become more with increase of total strain amplitude.

Tingwei Luo - One of the best experts on this subject based on the ideXlab platform.

  • Fatigue deformation characteristic of as-extruded Am30 magnesium Alloy
    Materials & Design, 2010
    Co-Authors: Tingwei Luo, Yuansheng Yang, W.h. Tong, Q.q. Duan, Xunong Dong
    Abstract:

    Abstract The fatigue deformation behavior of as-extruded Am30 magnesium Alloy has been investigated under different strain amplitudes in this paper, and the microstructure and fractograph during the cyclic deformation have been analyzed by use of the optical microscope (OM) and the scanning electronic microscope (SEM). The results show that there are many {1 0 –1 2} twins in the fatigue specimens of the extruded Am30 Alloy, and with the increase of total strain amplitude, the twins become coarser and longer. Otherwise, there are many twin bands composed of many tiny lenticular type twins ({1 0 –1 2}〈1 0 –1 1〉 twin) near the fatigue fracture, which become more with increase of total strain amplitude.

Yuansheng Yang - One of the best experts on this subject based on the ideXlab platform.

  • Fatigue deformation characteristic of as-extruded Am30 magnesium Alloy
    Materials & Design, 2010
    Co-Authors: Tingwei Luo, Yuansheng Yang, W.h. Tong, Q.q. Duan, Xunong Dong
    Abstract:

    Abstract The fatigue deformation behavior of as-extruded Am30 magnesium Alloy has been investigated under different strain amplitudes in this paper, and the microstructure and fractograph during the cyclic deformation have been analyzed by use of the optical microscope (OM) and the scanning electronic microscope (SEM). The results show that there are many {1 0 –1 2} twins in the fatigue specimens of the extruded Am30 Alloy, and with the increase of total strain amplitude, the twins become coarser and longer. Otherwise, there are many twin bands composed of many tiny lenticular type twins ({1 0 –1 2}〈1 0 –1 1〉 twin) near the fatigue fracture, which become more with increase of total strain amplitude.