Mn对Mg-5Sn-2Al-Zn合金组织及力学性能的影响  

Effect of Mn Addition on the Microstructure and Properties of Mg-5Sn-2Al-Zn Alloys

作　　者：穆桐[1] 孙镇[2] 邓子玉[1] 董旭光[1] 崔海涛[1] MU Tong SUN Zhen DENG Ziyu DONG Xuguang CUI Haitao(Shenyang Ligong University, Shenyang 110159 ,China Shenyang Research Institute of Nonferrous Metals,Shenyang 110141 ,China)

机构地区：[1]沈阳理工大学材料科学与工程学院,沈阳110159 [2]沈阳有色金属研究院,沈阳110141

出　　处：《沈阳理工大学学报》2017年第3期27-31,110,共6页Journal of Shenyang Ligong University

基　　金：辽宁省教育厅一般项目(L2014074)

摘　　要：利用纯镁锭、锡锭,纯铝粒、锌粒及含锰10%的镁锰中间合金制备Mg-5Sn-2AlZn-xMn合金(x=0、0.2、0.5及0.8),对Mn的含量进行调整,通过光学显微组织分析、XRD分析、扫描电镜(EDS)以及室温抗压强度测试,研究不同Mn含量对合金铸态、固溶后组织及力学性能的影响。结果表明:Mg-5Sn-2Al-Zn合金组织主要由α-Mg相、Mg_2Sn相以及较少量的β-Mg_(17)Al_(12)相组成;Mn含量的增加促进了Mg_2Sn相和β-Mg_(17)Al_(12)相在枝晶间的析出分布,并使枝晶细化;对不同Mn含量的合金进行室温压缩实验,表明当Mn含量在0.2%和0.5%时室温力学性能较好,固溶态合金的抗压强度由不含Mn时的355MPa分别提高到370MPa和360MPa,铸态合金也由不含Mn时的350MPa提高到360MPa;当含Mn达到0.8%时,颗粒状的第二相分布明显增多,其力学性能也急剧下降。Mg-5Sn-2A1-Zn-xMn（x=0,0. 2,0. 5and0. 8） alloys with different compositions were prepared by using pure Mg, Sn ,A1 ,Zn and Mg-10% Mn alloy. The microstructure and mechanical properties of different alloys were analyzed by optical microscopy, XRD （ X-ray diffraction）, SEM （ scanning electron microscopy） and the compression intensity tester. The results show that Mg-5 Sn-2AI-Zn alloys are composed mainly of α-Mg, Mg2 Sn and some β- Mg17A112 phases. The addition of Mn promoted the precipitation of Mg2Sn and 13-Mg17A112 phases at grain boundaries and in dendritic arms, and made dendritic grains refined. The compressive test was also done by using alloys of different Mn addition. While the addition of Mn reached 0. 2% or 0. 5% ,the alloys performed better in mechanical properties at room temperature,the compressive strength of alloys after solution increased from 355MPa of no Mn addition to 370MPa and 360MPa. The compressive strength of cast alloys also increased from 350MPa to 360MPa. With the Mn content of O. 8% ,second phases of particulate form in the structure increased significantly, and the mechanical properties fell dramatically.

关 键 词：Mg-5Sn-2Al-Zn合金 Mn添加 显微组织 力学性能 

分 类 号：TG113[金属学及工艺—物理冶金]