液相线铸造Al-18Si合金的凝固组织与力学性能研究  

Study on Solidification Microstructure and Mechanical Properties of Liquidus Cast Al-18Si Alloy

作　　者：刘细良 王云飞 杜福林 王建华[1,2] LIU Xi-liang;WANG Yun-fei;DU Fu-lin;WANG Jian-hua(Jiangsu Key Laboratory of Material Surface Science and Technology,Changzhou University,Changzhou 213164,Jiangsu,China;National Experimental Teaching Demonstration Center of Materials Science and Engineering,Changzhou University,Changzhou 213164,Jiangsu,China)

机构地区：[1]常州大学江苏省材料表面科学与技术重点实验室,江苏常州213164 [2]常州大学材料科学与工程国家级实验教学示范中心,江苏常州213164

出　　处：《铸造》2024年第4期509-513,共5页Foundry

基　　金：国家自然科学基金项目(52071032)。

摘　　要：采用光学显微镜、Image-Pro Plus软件、X射线衍射仪和万能拉伸试验机等研究液相线铸造Al-18Si合金的凝固组织与力学性能。结果表明,随着液相线温度下保温时间的增加,Al-18Si过共晶铝硅合金中初生硅的尺寸呈现先减小后增大的趋势,力学性能则呈现先增大后减小的趋势。与普通铸造相比,液相线铸造可使Al-18Si合金中初生硅平均尺寸减小30.6%,使该合金抗拉强度和伸长率分别提高27%和108%。因此,液相线铸造是改善过共晶铝硅合金凝固组织和力学性能的有效方法。The solidification microstructure and mechanical properties of liquidus cast Al-18Si alloy were studied using optical microscopy,Image-Pro Plus software,X-ray diffractometer,and universal tensile testing machine.The results indicated that with the increase of holding time at liquidus temperature,the size of primary silicon in Al-18Si hypereutectic aluminum silicon alloy showed a trend of first decreasing and then increasing,while the mechanical properties showed a trend of first increasing and then decreasing.Compared with ordinary casting,the liquidus casting reduced the average size of the primary silicon in the Al-18Si alloy by 30.6%,and increased the tensile strength and elongation of the alloy by 27%and 108%,respectively.Therefore,the liquidus casting was an effective method to improve the solidification microstructure and mechanical properties of hypereutectic aluminum silicon alloys.

关 键 词：过共晶铝硅合金 液相线铸造 凝固组织 力学性能 

分 类 号：TG24[金属学及工艺—铸造] TG146.21[一般工业技术—材料科学与工程]