Effect of Li content on microstructure and mechanical property of Mg-xLi-3(Al-Si) alloys  

Li含量对Mg-xLi-3(Al-Si)合金显微组织和力学性能的影响（英文）

作　　者：Cheng ZHANG Liang WU Zi-long ZHAO Zhi-hui XIE Guang-sheng HUANG Lei LIU Bin JIANG Andrej ATRENS Fu-sheng PAN 张诚;吴量;赵子龙;谢治辉;黄光胜;刘磊;蒋斌;Andrej ATRENS;潘复生(重庆大学材料科学与工程学院,机械传动国家重点实验室,重庆400044;重庆大学国家镁合金材料工程技术研究中心,重庆400044;重庆大学土木工程学院,重庆400045;西华师范大学化学化工学院化学合成与污染控制四川省重点实验室,南充637002;重庆市科学技术研究院重庆市先进材料研究中心,重庆401123;School of Mechanical and Mining Engineering,The University of Queensland,Brisbane Qld 4072,Australia)

机构地区：[1]State Key Laboratory of Mechanical Transmission,College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China [2]National Engineering Research Center for Magnesium Alloys,Chongqing University,Chongqing 400044,China [3]College of Civil Engineering,Chongqing University,Chongqing 400045,China [4]Synthesis and Pollution Control Key Laboratory of Sichuan Province,College of Chemistry and Chemical Engineering,China West Normal University,Nanchong 637002,China [5]Chongqing Research Center for Advanced Materials,Chongqing Academy of Science and Technology,Chongqing 401123,China [6]School of Mechanical and Mining Engineering,The University of Queensland,Brisbane Qld 4072,Australia

出　　处：《Transactions of Nonferrous Metals Society of China》2019年第12期2506-2513,共8页中国有色金属学报（英文版）

基　　金：Projects(51971040,51701029,51671041,51531002) supported by the National Natural Science Foundation of China;Project(2016YFB0301100) supported by the National Key Research and Development Program of China;Projects(2018T110943,2017M620410) supported by the China Postdoctoral Science Foundation;Project(Xm2017010) supported by the the Chongqing Postdoctoral Scientific Research Foundation,China;Project(2018CDGFCL005) supported by the Fundamental Research Funds for the Central Universities,China

摘　　要：Mg-4 Li-3(Al-Si),Mg-8 Li-3(Al-Si)and Mg-12 Li-3(Al-Si)alloys based on theα-Mg,α-Mg+β-Li,β-Li phases,respectively,were produced to investigate the effect of alloying with Al-Si eutectic on the microstructure and mechanical properties of the three alloys.Alloying with the Al-Si eutectic of Mg-xLi(x=4,8 and 12 wt.%)alloys caused the formation of different types of Al-Li precipitates:Al3Li,AlLi and Li3Al2,respectively.Also,considerable quantities of Mg2Si phase particles were found in the three alloys.The results of tensile tests showed that the Mg-4Li-3(Al-Si)alloy exhibited the highest ultimate tensile strength(UTS)of 249 MPa but the lowest elongation of 6.3%.The Mg-12Li-3(Al-Si)alloy had the highest elongation of 26%but the lowest UTS of 173 MPa.The different mechanical properties were attributed to the different crystal structures of the three alloys and the precipitate with different type,morphology and distribution.基于α-Mg、α-Mg+β-Li和β-Li三种相结构,制备Mg-4Li-3(Al-Si)、Mg-8Li-3(Al-Si)和Mg-12Li-3(Al-Si)三种合金,用于研究Al-Si共晶体对其组织和力学性能的影响。在Mg-xLi(x=4%,8%和12%,质量分数)合金中添加Al-Si共晶体分别形成以下的Al-Li析出相:Al3Li、AlLi和Li3Al2。此外,在这三种合金中还发现大量的Mg2Si相颗粒。拉伸试验结果表明,Mg-4Li-3(Al-Si)合金的极限抗拉强度最高,为249MPa,其伸长率最低,为6.3%。Mg-12Li-3(Al-Si)合金的伸长率最高,为26%,但极限抗拉强度最低,为173 MPa。这三种合金力学性能的差异归因于晶体结构的不同以及析出物类型、形态和分布的不同。

关 键 词：Mg-Li alloy Al-Si eutectic second phase tensile strength ELONGATION 

分 类 号：TG1[金属学及工艺—金属学]