深冷轧制对Mg-9Li-1Zn合金微观组织及力学性能的影响  

Effect of cryogenic rolling on microstructure and mechanical properties of Mg-9Li-1Zn alloy

作　　者：何旭 逄雪 冯效琰 赵莉萍[1,2] 王海燕 杨礼林[1,2] 金自力 李瑞红 HE Xu;PANG Xue;FENG Xiao-yan;ZHAO Li-ping;WANG Hai-yan;YANG Li-lin;JIN Zi-li;LI Rui-hong(School of Materials and Metallurgy,Inner Mongolia University of Science and Technology,Baotou 014010,China;Key Laboratory of Advanced Metal Materials of Inner Mongolia Autonomous Region,Baotou 014010,China)

机构地区：[1]内蒙古科技大学材料与冶金学院,内蒙古包头014010 [2]内蒙古自治区新金属材料重点实验室,内蒙古包头014010

出　　处：《材料热处理学报》2023年第12期55-61,共7页Transactions of Materials and Heat Treatment

基　　金：内蒙古自治区重大科技攻关项目(2021GG0094);内蒙古自治区自然科学基金(2023MS05038)。

摘　　要：首先对Mg-9Li-1Zn(LZ91)合金进行了不同时间的深冷处理,随后进行深冷轧制。利用光学显微镜、扫描电镜及拉伸试验机等研究了深冷轧制对合金微观组织和力学性能的影响。结果表明:深冷4 h后深冷轧制的合金中α-Mg相出现了一定程度的细化,并以细针状弥散分布于β-Li相中。深冷20 h后深冷轧制的合金中α-Mg相形貌并没有发生明显改变。与室温轧制相比,深冷4 h后深冷轧制的合金的抗拉强度和屈服强度分别提高了约43和36 MPa,而深冷20 h后深冷轧制的合金的抗拉强度和屈服强度分别增加了约20和50 MPa。Firstly,the Mg-9Li-1Zn(LZ91)alloy was subjected to cryogenic treatment for different time,followed by cryogenic rolling.Effect of cryogenic rolling on microstructure and mechanical properties of the alloy was studied by means of optical microscope,scanning electron microscopy and tensile testing machine.The results show that after cryogenic treatment for 4 h,theα-Mg phase in the alloy after cryogenic rolling exhibits a certain degree of refinement and is dispersed in theβ-Li phase as fine needles.After cryogenic treatment for 20 h,there is no significant change in the morphology ofα-Mg phase in the alloy after cryogenic rolling.Compared with room temperature rolling,the tensile strength and yield strength of the alloy after cryogenic treatment for 4 h and cryogenic rolling are increased by about 43 MPa and 36 MPa,respectively,while the tensile strength and yield strength of the alloy after cryogenic treatment for 20 h and cryogenic rolling are increased by about 20 MPa and 50 MPa,respectively.

关 键 词：镁锂合金 深冷处理 深冷轧制 组织 力学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]