Sm对ADC12合金微观组织与力学性能的影响  

Effects of Sm Addition on Microstructure and Mechanical Properties of ADC12 Alloy

作　　者：饶远生[1] 闫洪[1] 胡志[1,2] 

机构地区：[1]南昌大学机电工程学院 [2]江西省科学院江西省铜钨新材料重点实验室

出　　处：《特种铸造及有色合金》2012年第10期965-969,共5页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(51165032);江西省教育厅资助项目(GJJ11269);江西省高等学校科技创新团队资助项目(00008713);江西省铜钨新材料重点实验室开放基金项目(2011-TW-03);江西省自然科学基金资助项目(20122BAB216017)

摘　　要：采用光学显微镜、扫描电镜及能谱仪等分析手段,研究了不同含量的稀土Sm对ADC12合金微观组织和力学性能的影响。结果表明,Sm添加量小于1.0%时,随着含量的增加,二次枝晶臂间距、晶粒尺寸、Si相尺寸减小,抗拉强度和伸长率增加;当Sm含量为1.0%时,二次枝晶间距约为15μm,晶粒平均尺寸为30～40μm,Si相大部分呈圆整度较好的短棒状或细小球状,此时抗拉强度为220MPa,伸长率为3.1%,比ADC12合金分别提高了22%和210%;当Sm含量超过1.0%时,细化作用减弱,合金的力学性能下降。Microstructures and mechanical properties of ADC12 alloy with different Sm additions were investigated by optical microscopy（OM）,scanning electron microscopy（SEM）,energy dispersive spectrometry（EDS）.With the increase of the Sm in the range of 0~1.0%,the secondary dendrite arm spacing and the size of primary α-Al phase as well as the size of silicon phase are decreased,while the tensile strength and elongation are increased.With 1% Sm addition,the secondary dendrite arm spacing and the average size of primary α-Al cell are about 15 μm and 30~40 μm,respectively,and most of the Si phases exhibit spherical structure or rod-like shape with high aspect ratio.The tensile strength and elongation reach 220 MPa and 3.1%,respectively,increased by 22% and 210%,respectively,compared with those of ADC12 alloy.However,with Sm addition more than 1%,the mechanical properties are decreased as a result of coarseness of the microstructures.

关 键 词：SM ADC12铝合金 微观组织 力学性能 细化 变质 

分 类 号：TG146.21[一般工业技术—材料科学与工程]