Effect of Y for enhanced age hardening response and mechanical properties of Mg–Ho–Y–Zr alloys
Effect of Y for enhanced age hardening response and mechanical properties of Mg–Ho–Y–Zr alloys
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DOI：
10.1016/j.jallcom.2006.12.120
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发表时间：
2008-04
影响因子：
6.2
通讯作者：
J. L. Wang;Daofan Zhang;D. Fang;Huayi Lu;D. Tang;Jie Zhang;J. Meng
中科院分区：
文献类型：
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作者：
J. L. Wang;Daofan Zhang;D. Fang;Huayi Lu;D. Tang;Jie Zhang;J. Meng
在这项研究中，时效硬化特性和拉伸性能的Mg-4 Ho-xY-0.6Zr合金（x=0，3，5，和7wt%）的成分依赖性进行了研究。结果表明，随着Y含量的增加，合金在淬火态和时效峰态下的硬度都有所提高。相当大的时效硬化反应被确认为合金。当Y含量为7%时，合金在250°C时效时表现出最显著的时效硬化效应。合金的抗拉强度随Y含量的增加而单调增加，Mg-4 Ho-7 Y-0.6Zr合金的抗拉强度和屈服强度最大，室温下分别为240和165 MPa，250°C下分别为204和131 MPa。强度的提高似乎与β′和/或平衡Mg 24 Y（Ho）5相以及高密度位错有关。
In this study, compositional dependence of age hardening characteristics and tensile properties were investigated for Mg–4Ho–xY–0.6Zr alloys (x=0, 3, 5, and 7wt%). The result showed that with increasing Y content, the hardness of the alloys increased in the as-quenched and aged-peak conditions. Considerable age hardening response was recognized for the alloys. When the alloy containing 7% Y showed the most remarkable age hardening response at aging temperature of 250°C. The tensile strength of the alloys increased monotonously with increasing Y content, and Mg–4Ho–7Y–0.6Zr exhibited the maximum ultimate tensile strength and yield strength at peak hardness, and the values were 240 and 165MPa at room temperature, and 204 and 131MPa at 250°C, respectively. The improvement in strength appeared to be associated with β′ and/or equilibrium Mg24Y(Ho)5precipitates and high dense dislocation.