The effect of Ba on the microstructure and age hardening of an Mg-Zn alloy

被引：50
作者：
Buha, J. [1 ]
机构：
[1] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050047, Japan
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2008年 / 491卷 / 1-2期
基金：
日本学术振兴会;
关键词：
magnesium alloys; alloying; precipitation hardening; TEM; SEM;
D O I：
10.1016/j.msea.2008.01.027
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
A micro-alloying addition of Ba to Mg-2.8Zn (at.%) alloy almost doubles the hardness increment produced by artificial ageing. Alloying with Ba promotes the formation of an increased number density of the strengthening precipitates, i.e. it stimulates the precipitate nucleation, and accelerates the kinetics of precipitation during artificial and natural ageing. The solidus temperature of the Ba-containing alloy is considerably increased compared to that of the binary alloy, which allows for the use of higher solutionizing temperatures and wide is the temperature range available for the mechanical processing. The dispersion strengthening in the as-homogenized Mg-Zn-Ba alloy is achieved by densely distributed intenmetallic particles (Mg7Zn2Ba) present on the grain boundaries and within the grains. (C) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码：70 / 79
页数：10
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