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金属学报  2012 

Mg-(11-13)Gd-1Zn变形镁合金的组织和力学性能

DOI: 10.3724/SP.J.1037.2012.00156, PP. 733-738

Keywords: 镁合金,Gd,Zn,时效,长周期堆垛有序相

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Abstract:

制备了3种成分的Mg-Gd-Zn三元合金,并对其显微组织和力学性能进行了较系统的研究.结果表明,Mg-(11-13)Gd-1Zn(质量分数,%)三元合金的铸态组织由α-Mg,(Mg,Zn)3Gd和具有14H结构的长周期堆垛有序相(14H-LPSO)组成;(Mg,Zn)3Gd呈现典型的网状共晶形貌,其体积分数随Gd含量的增加而增大.热挤压过程中(Mg,Zn)3Gd相破碎,其颗粒沿挤压方向排列,而14H-LPSO相则分布于条状分布的(Mg,Zn)3Gd颗粒之间.铸态和挤压态合金在高温固溶处理后,14H--LPSO相的体积分数增加,大部分(Mg,Zn)3Gd相溶入基体.挤压态合金经固溶和时效(T6)处理后,显微组织中14H--LPSO相的体积分数大幅度增加,而且出现了β'和β1沉淀颗粒.对挤压后的合金直接进行时效处理(T5)过程中也形成了β'和β1沉淀,但14H-LPSO相没有显著增加.3种合金中Mg-11Gd-1Zn合金在T6态的性能最好,抗拉强度高达416MPa.

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