采用光学显微镜,SEM扫描电镜,XRD以及力学性能测试等手段,对比研究了Mg-7Li-3Zn,Mg-7Li-3A1和Mg-7Li-1.5Al-1.5Zn的合金组织,力学性能以及断裂机制.结果表明:Zn和Al主要以固溶形式存在于Mg-Li合金中,但仍有少量Al与Mg会形成中间相以颗粒状弥散分布在α-Mg的晶界处和-Li的基体中.三类合金经过挤压变形后,组织得到细化,回复再结晶现象明显,力学性能发生明显改善.其中Mg-7Li-3Al的抗拉强度和最大延伸率达到最高,分别为239 MPa和27％,比铸态下分别提高34％和93％.
参考文献
| [1] | Aghion E.;Bronfin B. .Magnesium Alloys Development towards the 21~(st) Century[J].Materials Science Forum,2000(0):19-28. |
| [2] | Dong, HW;Wang, LD;Wu, YM;Wang, LM .Effect of Y on microstructure and mechanical properties of duplex Mg-7Li alloys[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2010(1):468-474. |
| [3] | Sivakesavam O.;Prasad YVRK. .Characteristics of superplasticity domain in the processing map for hot working of as-cast Mg-11.5Li-1.5Al alloy[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2002(1/2):270-277. |
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