不同冷轧变形量下LA141镁锂合金的组织与力学性能

Microstructure and Mechanical Properties of LA141 Mg-Li Alloy under Different Cold Rolling Deformation Amount

摘要: 对挤压态LA141镁锂合金进行了30%～70%不同变形量的冷轧，采用显微组织观察、XRD分析、拉伸试验等研究了冷轧变形后LA141镁锂合金的显微组织及力学性能。结果表明：冷轧过程中合金未发生动态再结晶，晶内有大量析出相出现。随着冷轧变形量的增加，LA141合金的晶粒沿着轧制方向被逐渐拉长，合金的抗拉强度和伸长率先升高后降低。50%冷轧变形的合金的抗拉强度和伸长率均达到最大值，分别为231.4 MPa和37.5%，强塑性匹配最好。

Abstract: The extruded LA141 Mg-Li alloy was cold-rolled with different deformations of 30% to 70%.The microstructure and mechanical properties of the LA141 magnesium-lithium alloy after cold-rolling deformation were studied by means of microstructure observation, XRD analysis, and tensile test.The results show that there is no dynamic recrystallization in LA141 alloy during cold rolling, and a large amount of precipitates appear in the grains.With the increase of cold rolling deformation, the grain size of LA141 alloy is gradually elongated along the rolling direction, and the tensile strength and elongation of the alloy increase first and then decrease.The maximum tensile strength and elongation of the 50%cold-rolled alloy are 231.4 MPa and 37.5%, respectively, and the strong plastic matching is the best.