Microstructures and properties of a Mg-Li-Al-Zn wrought alloy
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摘要: 根据Mg-Li二元合金相图及Al,Zn元素在合金中的作用,设计了一种新的β基变形镁锂合金(Mg-Li-Al-Zn),用光学显微镜和X射线衍射法对合金锻造、轧制和轧制退火态的组织及合金相进行了分析,结果表明该合金轧制退火态具有比较理想的组织.不同状态合金的拉伸性能表明,轧制退火态下合金具有最高的强度和屈强比,并具有较好的塑性.Abstract: A novel β base Mg-Li-Al-Zn wrought alloy was designed according as the Mg-Li binary phase diagram and effect of Al, Zn on the alloys. The microstructure and alloy phases changes of the alloy on the states of casting, forging, rolling and rolling-annealing were systematically investigated by optical microscope and X-Ray. The results show that the microstructure of as rolling-annealing is satisfying. The results from tensile test show that the alloy at the state after rolling and consequent heating at 220℃ with holding time of 2 hour has either the highest fracture strength or the highest ratio of the yield strength to fracture strength, meanwhile the plasticity is quite acceptable.
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Key words:
- micro structure /
- heat treatment /
- Mg-Li wrought alloy /
- alloy phases
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