微合金化元素对7005铝合金铸态组织与性能的影响Effect of trace elements on microstructure and properties of as-cast 7005 aluminum alloy
倪培相,左秀荣,李贞明,赵亮,王齐伟
摘要(Abstract):
采用金相显微镜、SEM、EDS等试验方法研究了Al-10Ti中间合金、细晶铝锭、Sc-Zr以及Ti-Sc-Zr等细化方式细化的7005铝合金铸态组织和铸态力学性能。结果表明,由Al-10Ti中间合金细化的合金晶粒最大,平均晶粒直径约为330μm;由细晶铝锭细化的合金晶粒明显变小,平均直径在170μm左右,抗拉强度由Al-10Ti细化时的280MPa提高到了304MPa,伸长率由3.2%提高到4.2%。由Sc-Zr细化的合金的晶粒直径约为50μm,抗拉强度达到了330MPa,但伸长率只有2%;由Ti-Sc-Zr细化的合金的晶粒直径约为35μm,力学性能最好,抗拉强度达到338MPa,伸长率达到4.5%。
关键词(KeyWords): 7005铝合金;Ti;Sc;Zr;微观组织;力学性能
基金项目(Foundation): 河南省科技攻关项目(0624250012);; 河南省教育厅自然科学研究项目(2007450001)
作者(Author): 倪培相,左秀荣,李贞明,赵亮,王齐伟
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