Effect of lithium content on the mechanical and corrosion behaviors of HCP binary Mg-Li alloys
Effect of lithium content on the mechanical and corrosion behaviors of HCP binary Mg-Li alloys
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锂含量对HCP二元镁锂合金力学和腐蚀行为的影响
DOI：
10.1016/j.jma.2020.02.022
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发表时间：
2021-03-15
影响因子：
17.6
通讯作者：
Huang, Huaipei
中科院分区：
文献类型：
--
作者：
Li, Chuanqiang;He, Yibin;Huang, Huaipei
研究了挤压态HCP Mg-xLi(x=1，3，5；in wt%)合金的显微组织、晶体织构、力学性能和耐蚀性。结果表明，高锂含量的HCP镁5Li合金的动态再结晶(DRX)程度低于镁1Li和镁3Li合金。此外，Mg-1Li合金的45°基面(0001)织构可转变为(11-20)和(10-10)柱状织构，c轴大致平行于横向织构(Td)。结果表明，强烈的柱状织构导致了挤压态Mg-3Li和Mg-5Li合金的力学各向异性，这些合金具有较高的机械强度和较低的挤压方向伸长率(TD样品则相反)。从腐蚀行为来看，三种镁锂合金都发生了丝状腐蚀，而高锂含量的镁锂合金由于具有细小的晶粒、柱状织构和表面膜，减轻了沟槽状腐蚀，提高了耐蚀性。(三)2020年重庆大学。爱思唯尔公司代表科爱通信有限公司提供的出版服务。
The microstructure, crystallographic texture, mechanical properties and corrosion resistance of as-extruded HCP Mg-xLi (x = 1, 3, 5; in wt%) alloys were investigated. The results indicated that the HCP Mg-5Li alloy with high lithium content exhibited a low degree of dynamic recrystallization (DRX) compared with Mg-1Li and Mg-3Li alloys. Besides, the 45 degrees base (0001) texture of Mg-1Li alloy could turn into (11-20) and (10-10) prismatic texture of Mg-3Li and Mg-5Li alloys with c-axis approximately parallel to transverse direction (TD). As a result, the strong prismatic texture resulted in the mechanical anisotropy of as-extruded Mg-3Li and Mg-5Li alloys with higher mechanical strength and low elongation along extrusion direction (ED) (reverse for TD sample). Regarding of corrosion behaviors, filiform corrosion occurred in the three Mg-Li alloys, whilst the high lithium content could mitigate the groove-like corrosion and improve the corrosion resistance of Mg-5Li alloy, which was ascribed to the refined grains, prismatic texture and surface film. (C) 2020 Chongqing University. Publishing services provided by Elsevier B.V. on behalf of KeAi Communications Co. Ltd.