Mg-9Zn-XAl合金半固态成形的热力学分析及实验研究（英文）  

Thermodynamic Analysis and Experimental Investigation of Mg-9Zn-XAl Alloy for Semi-Solid Forming

作　　者：李春[1,2] 崔乐[1] 范新会[1,2] 陈建 李英[1] 袁训锋[1] 李元东[3] Li Chun;Cui Le;Fan Xinhui;Chen Jian;Li Ying;Yuan Xunfeng;Li Yuandong(Shaanxi Key Laboratory of Comprehensive Utilization of Tailings Resources, Shangluo University, Shangluo 726000,China;Xi’an Technological University, Xi’an 710021,China;State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China)

机构地区：[1]商洛学院陕西省尾矿综合利用重点实验室,陕西商洛726000 [2]西安工业大学,陕西西安710021 [3]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,甘肃兰州730050

出　　处：《稀有金属材料与工程》2019年第6期1769-1776,共8页Rare Metal Materials and Engineering

基　　金：National Natural Science Foundation of China(51464031,51471123);Scientific Research Plan of Shaanxi Education Department(16JK1241);Planned Science and Technology of Shangluo City(SK2016-29)

摘　　要：采用相图计算软件Pandat计算了Mg-9Zn-XAl(X=2,4,6,质量分数,%)合金的凝固温度窗口、固相率对温度的敏感性、加工温度窗口和相组成及其转变路径,并进行了实验验证。结果表明:Mg-9Zn-XAl镁合金的半固态加工温度窗口较大,易于进行半固态成形操作,且在半固态加工温度区间,其固相率对温度的敏感性均小于0.015。当Al含量不同时,其相的转变温度和路径不同。Mg-9Zn-XAl在凝固过程中均形成α-Mg、Mg Zn,Mg32(Al,Zn)49和Al5Mg11Zn4相,当Al含量增加至6%时,形成了Mg17Al12相。自孕育流变成形Mg-9Zn-XAl合金的晶粒尺寸和圆整度分别为65.3、56.5、52.2μm和1.3、1.19、1.23。当加工温度为150℃时,其抗压强度和压缩变形量分别为278、283、295 MPa和36.22%、33.02%、31.21%。Solidification temperature range,temperature sensitivity of the solid fraction,temperature process window and phase composition and transformation path of Mg-9Zn-XAl(X=2,4,6,wt%)alloys were calculated by Pandat calculation,and studied by experiment.The results indicate that a larger temperature window is conducive to the control and operation of semi-solid forming for the Mg-9Zn-XAl alloy.The temperature sensitivity of all solid fractions is smaller than 0.015.Mg-9Zn-XAl alloys have different transformation temperatures and paths of the phase at different Al additions.α-Mg,Mg Zn,Mg32(Al,Zn)49 and Al5Mg11Zn4 are formed in all samples.When Al addition is increased to 6%,Mg17Al12 phase is formed.The grain size and roundness of Mg-9Zn-XAl alloys prepared by self-inoculation rheo-diecasting method are 65.3,56.5,52.2μm and 1.3,1.19,1.23,respectively.When the working temperature is 150°C,the comprehensive strength and deformation are 278,283,295 MPa and 36.22%,33.02%,31.21%,respectively.

关 键 词：热力学分析 Mg-9Zn-XAl合金 半固态成形 相转变 

分 类 号：TG146.22[一般工业技术—材料科学与工程] TG244.3[金属学及工艺—金属材料]