Microstructure and mechanical properties of an Al–Mg alloy solidified under high pressures

Microstructure and mechanical properties of an Al–Mg alloy solidified under high pressures
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高压凝固Al-Mg合金的显微组织与力学性能

DOI:
10.1016/j.jallcom.2013.04.184
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发表时间:
2013-11
影响因子:
6.2
通讯作者:
T.J. Li
T.J. Li
中科院分区:
材料科学2区
文献类型:
--
作者:
E. Brosh;H.W. Wang;Z.J. Wei;T.J. Li

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Al-42.2at.%合金的相形成、显微组织及其演变和力学性能研究了镁合金在高压下的凝固过程。在1GPa和2GPa压力下凝固后,主相为γ相,比平衡状态下更富Al。当压力进一步增加到3GPa时,主相为过饱和Al(Mg)固溶体,Mg的溶解度高达41.6at.%。与在环境压力下凝固的类似合金不同,β相不会出现。计算的Al-Mg系高压相图表明,虽然β相的稳定范围随压力的增大而减小,但在室温下仍是稳定的。因此,β相的消失被解释为动力学抑制,这是由于在高压下的缓慢扩散速率,这抑制了固-固反应。Al-42.2at.%与常压下凝固的镁合金相比,在3GPa下凝固的镁合金的抗拉强度显著提高。
Phase formation, the microstructure and its evolution, and the mechanical properties of an Al–42.2 at.% Mg alloy solidified under high pressures were investigated. After solidification at pressures of 1 GPa and 2 GPa, the main phase is the γ phase, richer in Al than in equilibrium condition. When the pressure is further increased to 3 GPa, the main phase is the supersaturated Al(Mg) solid solution with Mg solubility up to 41.6 at.%. Unlike in similar alloys solidified at ambient pressure, the β phase does not appear. Calculated high-pressure phase diagrams of the Al–Mg system show that although the stability range of the β phase is diminished with pressure, it is still thermodynamically stable at room temperature. Hence, the disappearance of the β phase is interpreted as kinetic suppression, due to the slow diffusion rate at high pressures, which inhibits solid–solid reactions. The Al–42.2 at.% Mg alloy solidified under 3 GPa has remarkably enhanced ultimate tensile strength compared to the alloy solidified under normal atmospheric pressure.
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