冷却速率对Mg_(97)Er_2Zn_1合金凝固组织和力学性能的影响  

Influences of Cooling Rates on Solidification Microstructure and Mechanical Properties of Mg_(97)Er_2Zn_1 Alloy

作　　者：张晋涛[1] 吁艳林[2] 

机构地区：[1]四川工程职业技术学院,四川德阳618000 [2]南昌航空大学,江西南昌330063

出　　处：《铸造技术》2013年第12期1627-1630,共4页Foundry Technology

摘　　要：采用光学显微镜、X射线衍射、压缩及硬度试验,研究了不同冷却速率对Mg97Er2Zn1合金铸态组织和力学性能的影响。结果表明,在15~113℃/s的冷却速率范围,Mg97Er2Zn1合金的初生相呈树枝晶状,随着冷却速率增加,树枝晶逐渐细化,二次枝晶间距变小,合金的晶粒形貌由粗大的树枝状转变成细小的针状。第二相由非连续网状分布变成了连续网状分布再变成细条状分布。冷却速率的变化对Mg97Er2Zn1合金中的第二相的组成没有太大影响,合金中的第二相依然由X-Mg12Er1Zn1相和(Mg,Zn)xEr相组成。Mg97Er2Zn1合金的力学性能随着冷却速率的提高而增加。The effects of different cooling rates on microstructures and mechanical properties of Mg97Er2Znlalloy were investigated by optical microscope, X-ray diffraction, hardness testing and compressive testing machine. In the cooling rates from 15℃/s to 113℃/s, the second dendrite ann spacing for the alloys decreases with the increase of cooling rates; Dendrite morphology of Mg97Er2Znl alloy changes from the coarse dendritic to the small needle; The distribution of second phase changes from discontinuous reticular to continuous mesh, again into thin strips. The cooling rates do not change the component of second phase in the alloys, the second phase still consists of X-Mg97Er2Zn1 phase and （Mg,Zn）xEr phase. As the cooling rates increasing, the mechanical prooerties of the alloys imorove obviously.

关 键 词：Mg97Er2Zn1合金 冷却速率 凝固组织 力学性能 

分 类 号：TG146.22[一般工业技术—材料科学与工程]