伍华怡,张丁非,蒋璐瑶,冯靖凯,赵阳,潘复生.Zn添加对Mg-8Al-2Sn镁合金组织和性能的影响[J].稀有金属材料与工程,2019,48(7):2091~2198.[Wu Huayi,Zhang Dingfei,Jiang Luyao,Feng Jingkai,Zhao Yang,Pan Fusheng.Effects of Zn Addition on the Microstructure and Mechanical Properties of Mg-8Al-2Sn Alloy[J].Rare Metal Materials and Engineering,2019,48(7):2091~2198.]
Zn添加对Mg-8Al-2Sn镁合金组织和性能的影响
投稿时间:2018-01-26  修订日期:2019-06-17
中文关键词:  镁合金  Mg-Al-Sn-Zn挤压镁合金  显微组织  力学性能
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目),国家重点基础研究发展计划(973计划),国家重点研发计划项目
中文摘要:
      本文以Mg-8Al-2Sn变形镁合金为研究背景,通过在Mg-8Al-2Sn合金中添加0-2 wt.%含量的Zn元素,研究了Zn添加对Mg-8Al-2Sn挤压镁合金显微组织和性能的影响。研究结果表明,铸态Mg-8Al-2Sn-xZn合金的相组成主要是α-Mg相、Mg17Al12相和Mg2Sn相。在添加Zn元素以后,合金中的共晶化合物的形态发生变化,由共晶组织变为离异共晶组织。挤压过后,晶粒组织尺寸更均匀。Zn元素的加入,会促进合金中第二相在挤压过程中的动态析出以及第二相尺寸的粗化。合金在时效中产生的析出相的数量也随着Zn含量的增多而增加。随着Zn含量的增加,挤压态和时效态合金的屈服强度和抗拉强度都随之增加。当Zn含量达到2 wt.%时,合金力学性能最好,其时效态的抗拉强度,屈服强度和延伸率分别是385 MPa, 291 MPa和6.44%。
Effects of Zn Addition on the Microstructure and Mechanical Properties of Mg-8Al-2Sn Alloy
英文关键词:magnesium alloys  Mg-Al-Sn-Zn alloy  extrusion  microstructure  mechanical properties
英文摘要:
      The effect of adding 0-2.0 wt.% Zn to the Mg-8Al-2Sn alloy was investigated by analyzing the microstructures and tensile properties. The results revealed that the phase compositions of Mg-8Al-2Sn-xZn alloys are α-Mg, Mg17Al12 and Mg2Sn phases. The morphology of eutectic phases of the as-cast alloys was changed from normal eutectic to divorced eutectic with Zn addition. Grain sizes of the alloys were uniform after hot extrusion with Zn addition. Dynamic precipitation of the second phases was promoted by the addition of Zn during hot extrusion. The second phases coarsened in Mg-8Al-2Sn-2Zn alloy. Precipitates formed during the aging treatment and the amount of which increased with the addition of Zn content. Besides, the ultimate tensile and yield strength of the extruded and aged alloys gradually increased with the addition of Zn content. The results showed that Mg-8Al-2Sn-2Zn alloy has the best mechanical property that the ultimate tensile strength, yield strength and elongation of the as-aged alloy were 385 MPa, 291 MPa and 6.44%, respectively.
作者单位E-mail
伍华怡 重庆大学 505280138@qq.com 
张丁非 重庆大学 zhangdingfei@cqu.edu.cn 
蒋璐瑶 重庆大学 676045745@qq.com 
冯靖凯 重庆大学 605493679@qq.com 
赵阳 重庆大学  
潘复生 重庆大学 fspan@cqu.edu.cn 
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