熔体净化和急冷协同对含镧过共晶铝硅合金组织凝固及力学性能的影响  

Effects of Melt Purification and Quenching on Solidification Structure and Mechanical Properties of La Containing Hypereutectic Al-Si Alloy

作　　者：荆伊蕾 朱翔鹰 吴长军[1,2] 王建华[1,2] JING Yilei;ZHU Xiangying;WU Changjun;WANG Jianhua(Jiangsu Key Laboratory of Material Surface Science and Technology,Changzhou University,Changzhou 213164,China;National Experimental Teaching Demonstration Center of Materials Science and Engineering,Changzhou University,Changzhou 213164,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：《热加工工艺》2024年第19期98-102,共5页Hot Working Technology

基　　金：国家自然科学基金项目(52071032)。

摘　　要：采用光学显微镜、扫描电镜和差示扫描量热仪等研究了熔体净化和急冷协同作用对Al-(16-24)Si-0.1La合金凝固组织和力学性能的影响。结果表明,与熔体急冷相比,熔体净化和急冷协同作用可完全抑制硅含量不超过20wt%的过共晶Al-Si-0.1La合金中初生硅的析出,明显细化Al-(16-24)Si-0.1La合金中的共晶组织,提高共晶组织的显微硬度。因此,熔体净化与急冷协同处理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 effects of melt purification and quenching on the solidification structure and mechanical properties of Al-(16-24)Si-0.1La alloy were studied by optical microscope,scanning electron microscope and differential scanning calorimeter.The reults show that,compared with that of melt quenching,the synergistic effects of melt purification and quenching can completely inhibit the precipitation of primary silicon in hypereutectic Al-Si-0.1La alloy with silicon content less than 20wt%,significantly refine the eutectic structure in Al-(16-24)Si-0.1La alloy,and improve the microhardness of the eutectic structure.Therefore,the collaborative treatment of melt purification and quenching is an effective method to improve the solidification structure and mechanical properties of hypereutectic Al-Si alloy.

关 键 词：过共晶铝硅合金 镧 熔体净化 熔体急冷 凝固组织 

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]