中国有色金属学报(英文版), 2017, 27(1): 73-81.
10.1016/S1003-6326(17)60008-6
挤压和热处理对Mg-8Zn-1Al-0.5Cu-0.5Mn镁合金显微组织和力学性能的影响
朱绍珍
1,
,
罗天骄
2,
,
张廷安
3,
,
刘运腾
4,
,
杨院生
5,
1.中国科学院 金属研究所，沈阳 110016; 东北大学 材料科学与工程学院，沈阳 110819;
2.中国科学院 金属研究所,沈阳,110016;
3.东北大学 多金属共生矿生态化冶金教育部重点实验室,沈阳,110819;
4.山东省轻质高强金属材料省级重点实验室,济南,250014;
5.中国科学院 金属研究所,沈阳,110016
研究挤压和热处理对Mg?8Zn?1Al?0.5Cu?0.5Mn镁合金显微组织和力学性能的影响。结果表明，合金在230和260°C挤压时呈现双峰组织，而在290°C挤压时合金发生了完全的动态再结晶。随着挤压温度的升高，合金动态再结晶越充分，从而使其基面织构降低。通过研究4种不同的热处理制度对290°C下挤压成型合金的影响发现，经过固溶+时效处理后，合金的晶粒发生明显长大。与固溶+单级时效的合金相比，固溶+双级的工艺能显著细化析出相，提高析出相的密度。同时，经固溶+双级时效处理后合金的力学性显著提高，其屈服强度、抗拉强度和伸长率分别为298 MPa、348 MPa和18%，这主要是由细小的再结晶晶粒与均匀弥散分布的第二相共同作用的结果。
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