时效处理工艺对Mg-12Zn-2Ca合金组织与性能的影响  

Influence of aging treatment on microstructure and properties of Mg-12Zn-2Ca alloy

作　　者：王博[1] Wang Bo(Materials Engineering Department,Bohai Shipbuilding Vocational College,Huludao 125000,China)

机构地区：[1]渤海船舶职业学院材料工程系,辽宁葫芦岛125000

出　　处：《锻压技术》2020年第9期177-180,共4页Forging & Stamping Technology

摘　　要：通过对Mg-12Zn-2Ca合金进行不同的T6处理(固溶+人工时效)工艺,并观察显微组织和测试布氏硬度,研究了时效处理工艺对Mg-12Zn-2Ca合金组织与性能的影响。试验结果表明:Mg-12Zn-2Ca合金在380℃下固溶20 h后,在180℃下进行不同时间的时效处理,随着时效时间的增加,合金的硬度值出现急剧上升,在时效12 h时达到阶段高点,之后在相对较小的区间波动,至96 h时达到最高点,随后出现明显回落。因此,Mg-12Zn-2Ca合金在380℃下固溶20 h后,在时效温度为180℃下的最佳时效时间为96 h,合金硬度到达最高值,为89.7 HBW,其组织为等轴晶α-Mg基体相以及在α-Mg相之间与α-Mg相内部弥撒分布着的Mg5Zn13Ca2与Mg6Zn3Ca2等第二相。Mg-12Zn-2Ca magnesium alloy was conducted by different T6 treatment processes(Solution and artificial aging),and its microstructure and hardness were tested.Then,the influences of aging treatment process on microstructure and properties of Mg-12Zn-2Ca alloy were studied.The results show that the hardness of Mg-12Zn-2Ca alloy increases sharply with the increasing of aging time when it is aging treated for different times after solid solution of 380℃×20 h,and it reaches the stage high point when aging for 12 h.After that,it fluctuates in a relatively small interval and reaches its highest point when aging for 96 h;then it drops significantly.Thus,when Mg-12 Zn-2 Ca alloy is treated under 380℃×20 h for solid solution and 180℃×96 h for aging,the hardness of alloy gets its maximum value of 89.7 HBW,and its microstructure is equiaxed α-Mg matrix phase and the second phases such as Mg5Zn13Ca2 and Mg6Zn3Ca2 which are distributed betweenα-Mg phase and insideα-Mg phase.

关 键 词：Mg-12Zn-2Ca合金 时效处理 硬度 等轴晶 第二相 

分 类 号：TG146.2[一般工业技术—材料科学与工程]