Influence of cerium on microstructures and mechanical properties of Al-Zn-Mg-Cu alloys

被引：0

作者：

赖建平 ^{[1
]}

姜荣票 ^{[1
]}

刘华山 ^{[1
]}

敦小龙 ^{[1
]}

李艳芬 ^{[1
]}

李晓谦 ^{[2
]}

机构：

[1] School of Materials Science and Engineering,Central South University

[2] School of Mechanical and Electrical Engineering, Central South University

来源：

JournalofCentralSouthUniversity | 2012年 / 19卷 / 04期

关键词：

Al-Zn-Mg-Cu alloy; cerium; microstructure; homogenization; precipitation;

D O I：

暂无

中图分类号：

TG146.21 [];

学科分类号：

080502 ;

摘要：

Effect of element cerium (Ce) on microstructure and mechanical properties of Al-Zn-Mg-Cu alloys has been investigated by transmission electron microscopy (TEM), scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and hardness test. The results show that addition of Ce can remarkably refine the as-cast grains and eutectic microstructure. A transformation from Mg(Zn,Cu,Al)2 phase to Al2CuMg phase is observed during homogenization. Furthermore, the Ce addition introduces changes in the precipitation process and consequently in the age-hardening behavior of the alloy. Microstructural measurements reveal that the addition of Ce promotes the precipitation of η' phase, but it also partly retards the precipitation of GP zones. The density of precipitates decreases in a certain degree and rod-like η' precipitates increase when Ce content is from 0.2% to 0.4% (mass fraction).

引用

页码：869 / 874

页数：6

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