Microstructure and mechanical properties of as-cast and extruded Mg-8Li-1Al-0.5Sn alloy
Microstructure and mechanical properties of as-cast and extruded Mg-8Li-1Al-0.5Sn alloy
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铸态和挤压态Mg-8Li-1Al-0.5Sn合金的显微组织和力学性能
DOI：
10.1016/j.msea.2017.10.036
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发表时间：
2018-01-02
期刊：
影响因子：
6.4
通讯作者：
Peng, Xiaodong
中科院分区：
文献类型：
--
作者：
Fu, Xuesong;Yang, Yan;Peng, Xiaodong
本研究采用铸造法制备了Mg-8Li-1Al-0.5Sn(wt%)合金，并对其进行了热挤压变形。通过金相显微镜、扫描电子显微镜、X射线衍射仪和拉伸试验研究了铸态和挤压态合金的显微组织和力学性能。结果表明，Mg-8Li-1Al-0.5Sn合金由α-Mg(HCP)、β-Li(体心立方)、LiMgAl2、Mg2Sn相、Li2MgSn相组成。热挤压后，β-Li相得到细化，镁锡化合物均匀分布于基体中。在室温下，挤压试件的屈服强度和极限拉伸强度分别达到240 Mpa和322 Mpa。在423K(150℃)时，挤压合金的极限抗拉强度达到220兆帕。与许多传统的镁锂合金相比，镁锂合金具有更高的强度。
Mg-8Li-1Al-0.5Sn (wt%) alloy was prepared by casting and deformed by hot extrusion in this study. The microstructure and mechanical properties of as-cast and extruded alloys were studied by OM, SEM, XRD, and the tensile test. The results show that the Mg-8Li-1Al-0.5Sn alloy consists of alpha-Mg (hcp), beta-Li (bcc), LiMgAl2, Mg2Sn, Li2MgSn phases. After hot extrusion, the beta-Li phase was refined, and Mg2Sn compounds were distributed uniformly in the matrix. The yield strength and ultimate tensile strength of extruded specimen reach to 240 MPa and 322 MPa respectively at room temperature. At 423 K (150 degrees C), the ultimate tensile strength arrives at 220 MPa for extruded alloy. The strength of Mg-8Li-1Al-0.5Sn alloy is higher than many traditional Mg-Li alloys.