Microstructural evolution and age-hardening behavior of quasicrystal-reinforced Mg-Dy-Zn alloy

被引：9
作者：
Bi, Guang-Li [1 ,2 ]
Han, Yu-Xiang [1 ,2 ]
Jiang, Jing [1 ,2 ]
Jiang, Chun-Hong [1 ,2 ,3 ]
Li, Yuan-Dong [1 ,2 ]
Ma, Ying [1 ,2 ]
机构：
[1] Lanzhou Univ Technol, State Key Lab Adv Proc & Recycling Nonferrous Met, Lanzhou 730050, Gansu, Peoples R China
[2] Lanzhou Univ Technol, Minist Educ, Key Lab Nonferrous Met Alloys & Proc, Lanzhou 730050, Gansu, Peoples R China
[3] Lanshi Foundry Co Ltd, Lanzhou 730050, Gansu, Peoples R China
来源：
RARE METALS | 2019年 / 38卷 / 08期
基金：
中国国家自然科学基金;
关键词：
Mg-Dy-Zn alloy; Microstructure; I phase; Age-hardening behavior; MECHANICAL-PROPERTIES; AS-CAST; W-PHASE; GRAIN-REFINEMENT; HIGH-STRENGTH; Y ALLOY; I-PHASE; TRANSFORMATIONS; ND;
D O I：
10.1007/s12598-018-1089-8
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Microstructural evolution and age-hardening behavior of Mg-2Dy-6Zn (at%) alloy during solid-solution and aging treatment were investigated. The microstructure of as-cast alloy is composed of -Mg, Mg3DyZn6 (I) phase, Mg3Dy2Zn3 (W) phase, Mg(Zn,Dy) phase and a small amount of Mg0.97Zn0.03 phases. After solid-solution treatment (480 degrees C, 12h), all the I phases and most W phases dissolve into -Mg matrix and the remainder W phases transform into Mg(Dy,Zn) phase and MgDy3 phase. During aging treatment, I phase and small amounts of W phases co-precipitate from -Mg matrix, respectively. The alloy exhibits a peak hardness of HV 77.5 at 200 degrees C for 8h. The excellent age-hardening behavior of alloy is mainly attributed to the co-precipitation strengthening of I and W phases.
引用
收藏
页码：739 / 745
页数：7
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