热处理对Mg_(94)Zn_2Y_4合金微观组织与力学性能的影响（英文）  

Effect of Heat Treatment on Microstructure and Mechanical Properties of Mg_(94)Zn_2Y_4 Alloy

作　　者：许敏[1] 滕新营[1] 杨超平[1] 张金洋[1] Xu Min Teng Xinying Yang Chaoping Zhang Jinyang(University of Jinan, Jinan 250022, Chin)

机构地区：[1]济南大学,山东济南250022

出　　处：《稀有金属材料与工程》2016年第11期2804-2808,共5页Rare Metal Materials and Engineering

基　　金：National Natural Science Foundation of China(51571102)

摘　　要：研究了在773 K、48 h条件下热处理对Mg94Zn2Y4合金的微观组织与力学性能的影响。结果表明,块形和板条结构的18R长周期堆垛结构相可直接从熔体凝固过程中形成。热处理后,绝大多数的块形和板条结构相转变为细片状或针状的14H相。在热处理过程中,有相当体积分数的LPSO（长周期堆垛结构）相由18R转变为14H。结果表明,经过热处理,块形和板条结构相与针状相可以在α-Mg基体中共存,并作为影响因素,使合金晶粒得到细化,晶粒尺寸为1424μm（平均晶粒尺寸为19μm）,使极限抗拉强度、屈服强度以及伸长率分别由铸态时的182 MPa、135 MPa和10.2%提高至245 MPa、157 MPa和13.8%。The effect of heat treatment at 773 K for 48 h on microstructure and mechanical properties of as-cast Mg94Zn2Y4（at%） alloy was investigated. The results show that block shaped and laths structured 18 R long period stacking ordered（LPSO） phase forms directly from the melt. After heat treatment, vast majority of the block shaped and laths structured LPSO phase changes into fine lamellar or needle-like shaped 14 H. During heat treatment, a great fraction of LPSO phase is transformed from 18 R structure to 14 H type. 18 R and 14 H can co-exist within the α-Mg matrix after solution treatment. As a result, grain sizes are refined to 1424 μm（the average grain size is about 19 μm）. The co-existence of the block shaped and laths structured phase and needle-like shaped phase help to improve the ultimate tensile strength, yield strength and elongation from 182 MPa, 135 MPa and 10.2% in as-cast alloy to 245 MPa, 157 MPa and 13.8%, respectively.

关 键 词：MG-ZN-Y合金 钇 相转变 长周期堆垛结构 力学性能 

分 类 号：TG146.22[一般工业技术—材料科学与工程] TG166.4[金属学及工艺—金属材料]