摘要
以Zn-25Al-5Mg-2.5Si合金为基体材料,通过常规铸造方法制备了加入不同含量稀土Y的锌铝合金。采用扫描电镜、拉伸试验机、硬度计等分析研究了稀土Y对合金显微组织和力学性能的影响。实验结果表明,添加稀土Y后,在锌铝合金中,其与Al、Zn等元素形成硬度高、热硬性好的复杂成分化合物,分散于晶界和枝晶中,细化了组织,有效地阻碍了高温时基体的变形和晶界移动。随着Y含量的增加,在室温、100℃和180℃时合金的抗拉强度基本呈先升后降的趋势。当Y含量为0.4%(质量分数)时合金的综合性能最好,高温强度和硬度显著提高。180℃时合金的抗拉强度比不加Y时提高了26.4%,硬度提高了47.8%。
The Zn-Al alloys containing different content of rare earth element Y are produced by cast with the Zn-25A1-SMg-2.5Si alloy as a matrix alloy. The effects of Y on the mierostructure and mechanical properties of Zn- 25Al-SMg-2. 5Si alloys are investigated. Results show that Y can react with Al, Zn etc. to form some compounds with complex composition which have high hardness and good hot-hardness and can disperse in crystal interfaces or branch crystal interfaces so that the alloy has refined and deformation of matrix and movement of crystal interfaces at high temperature are tempered. With the Y content increasing, the mechanical properties rise at first and then drop. The optimization of microstructure and performance is obtained with 0. 4wt% Y addition, especially the tensile strength and hardness are improved at high temperature. Compare to without Y, the tensile strength increases 26.4% ,micro- hardness increase 47. 8% at 180℃.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2010年第12期50-52,共3页
Materials Reports
基金
太原理工大学校青年基金(2008-190)
关键词
稀土
锌铝合金
显微组织
力学性能
rare earth, Zn-Al alloy, microstructure, mechanical property
