超轻Mg-Li-Al-Zn合金的制备与性能研究  

Research on Preparation and Properties of Ultra-light Mg-Li-Al-Zn Alloys

作　　者：胡勇 邓君[2] 徐进 康跃华 黎伟华 杨浩坤 HU Yong;DENG Jun;XU Jin;KANG Yuehua;LI Weihua;YANG HaoKun(Smart Manufacturing and Mainland Business Department, Hong Kong Productivity Council, Hong Kong 999077, China;School of Mechanical Engineering, Dongguan University Of Technology, Dongguan 523808, China;Guangdong Institute of Materials and Processing, Guangzhou 510650, China)

机构地区：[1]香港生产力促进局智能制造及内地业务部,中国香港999077 [2]东莞理工学院机械工程学院,广东东莞523808 [3]广东省材料与加工研究所,广东广州510650

出　　处：《东莞理工学院学报》2021年第3期123-127,共5页Journal of Dongguan University of Technology

基　　金：香港生产力促进局CRD资助项目(10008788)。

摘　　要：在氩气氛围保护的手套箱内熔炼和浇铸,并结合热轧工艺制备高强超轻Mg-(5%~8%)Li-1%Al-1%Zn合金。探讨了元素成分对镁锂合金材料的组织结构、强塑性和断裂形式的影响。结果表明:Li元素质量分数从5%上升到6%,材料的抗拉强度和塑性变形能力有明显提升;但随着Li元素增加到8%,材料抗拉强度有所降低,但是塑性变形能力保持提升,并提升明显。此外,在Li元素质量分数低于6%时,分别加入质量分数为1%的Al和Zn元素,可以明显提高材料的抗拉强度和塑性变形能力;但Li元素质量分数增加到8%时,1%Al和Zn元素的加入虽然能提升材料的抗拉强度,但是塑性变形能力急剧降低。金相与断口形貌观察结果表明,均匀分布的β-Li相是提升材料塑性变形能力的关键因素,Al和Zn元素的加入,有强化相的形成和析出,以提升材料强度。Ultra-light Mg-(5%~8%)Li-1%Al-1%Zn alloy was prepared by melting and casting in a glove box under the protection of argon atmosphere and combined with hot rolling process.The effects of elemental composition on the microstructure,strong plasticity and fracture pattern of Mg-Li alloy materials were investigated.The results show that the tensile strength and plastic deformation capacity of the material are significantly improved when the content of Li element increases from 5%to 6%.However,with the increase of Li element to 8%,the tensile strength of the material decreases somewhat,but the plastic deformation ability keeps improving,and the improvement is obvious.In addition,when the content of Li is less than 6%,the addition of Al and Zn,which are 1%respectively,can significantly improve the tensile strength and plastic deformation capacity of the material.However,when the content of Li element increases to 8 wt.%,the addition of 1%Al and Zn element can improve the tensile strength of the material,but the plastic deformation ability decreases sharply.The results of metallographic and fracture morphology show that the uniform distribution ofβ-Li phase is the key factor to improve the plastic deformation ability of the material.The addition of Al and Zn elements can form and precipitate the strengthening phase to improve the strength of the material.

关 键 词：镁锂合金 抗拉强度 塑性 断裂 

分 类 号：TB333[一般工业技术—材料科学与工程]