时效时间对Mg-8Al-1Zn-3Ca合金组织及力学性能的影响  

Influence of Aging Time on Microstructure and Mechanical Properties of Mg-8Al-1Zn-3Ca Alloy

作　　者：谢建昌[1] 李全安[1] 李建弘[1] 张兴渊[1] 

机构地区：[1]河南科技大学材料科学与工程学院,河南洛阳471003

出　　处：《热加工工艺》2008年第2期64-66,72,共4页Hot Working Technology

基　　金：河南省高校创新人才培养基金资助项目(豫高教[2002]129);洛阳市攻关项目(0602018A)

摘　　要：通过合金制备、微观分析和力学性能测试等方法研究了不同时效时间对Mg-8Al-1Zn-3Ca合金微观组织和力学性能的影响。结果表明,经过适当的时效处理后,Mg-8Al-1Zn-3Ca合金的组织明显细化,β(Mg17Al12)相减少,并析出粒状的化合物Al4Ca、Al2Ca和Al-Ca。随着时效时间的延长,在室温下,合金的抗拉强度呈先升后降的趋势,而伸长率正好相反。当时效时间在36h,合金的室温强度达到最大值,其值为195MPa,而对应的伸长率是3.25%。Through preparing alloy, analyzing microstructure and testing mechanical properties,the effects of aging time on microstructure and mechanical properties of Mg-8Al-1Zn-3Ca alloy were investigated. The results show that proper aging treatment time can make the microstructures of Mg-8Al-1Zn-3Ca alloy fine obviously, the quantity of β-Mg17Al12 phases reduce and Al4Ca, Al2Ca and Al-Ca form. With the increase of aging treatment time, the tensile strength of the alloy at room temperature first increases,then decreases. However, the elongation of the alloy is inverse relationship. When the time of aging treatment is up to 36 h,the value of tensile strength of the alloy at room temperature is up to its maximum, 195 MPa, but the corresponded value of elongation is up to its minimum, 3.25%.

关 键 词：时效处理 微观组织 高温力学性能 

分 类 号：TG146.22[一般工业技术—材料科学与工程]