Ca及时效处理对ZA102镁合金组织和力学性能的影响Effects of addition of Ca and aging treatment on microstructure and mechanical properties of ZA102 casting magnesium alloy
漆振华,林晓娉,代兆立,柳士强,李小芳
摘要(Abstract):
利用SEM、X射线衍射、拉伸性能测试、显微硬度测试等手段研究了合金元素Ca及时效处理对ZA102镁合金铸态组织和力学性能的影响。结果表明1%的Ca对合金铸态组织的改善效果最为明显,τ相(Mg32(Al,Zn)49)由断续网状变为细小的块状且分布弥散,ε相(MgZn)变得更加细小,同时形成了分布弥散的Al2Ca强化相,此时合金的抗拉强度和拉伸性能达到最大值,抗拉强度达到174 MPa、伸长率达到6%、硬度达到86 HV。如果Ca的含量超过1%合金的晶粒开始变大并且合金元素有偏聚的趋势,并导致其力学性能降低。对铸态试验合金在360℃×10 h+180℃(T6)下进行时效处理,结果表明经过T6处理后能进一步改善合金的组织和力学性能。
关键词(KeyWords): ZA102镁合金;Ca;组织;时效处理;力学性能
基金项目(Foundation): 河北省科学技术研究与发展计划项目(05547003D)
作者(Author): 漆振华,林晓娉,代兆立,柳士强,李小芳
DOI: 10.13289/j.issn.1009-6264.2011.05.021
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