超声功率对AlSi7MgCu2合金组织及力学性能的影响  

Effect of Ultrasonic Power on Microstructure and Mechanical Properties of AlSi7MgCu2 Alloy

作　　者：李便霞[1] 曾凡娇[1] LI Bian-xia;ZENG Fan-jiao(College of Mechanical and Electrical Engineering,Henan Vacational College of Agriculture,Zhengzhou 451450,Henan,China)

机构地区：[1]河南农业职业学院机电工程学院,河南郑州451450

出　　处：《铸造》2022年第9期1139-1143,共5页Foundry

摘　　要：研究了不同超声功率对AlSi7MgCu2合金组织与性能的影响。结果表明,当超声功率为1 400 W时,合金的凝固组织中初生α-Al相及共晶硅最为细小,共晶硅形貌由未处理铸态合金中的针片状转变为细小的颗粒状和蠕虫状。此时,合金的布氏硬度、抗拉强度和伸长率分别为HBW76.4、276 MPa和4.6%,与未超声处理合金相比,分别提高了13.02%、41.54%和84%。试样的断裂方式为韧性断裂,合金的综合力学性能得到显著提高和改善。The effect of different ultrasonic powers on the microstructure and properties of AlSi7MgCu2 alloy was studied. The results showed that when the ultrasonic power was 1 400 W, the primary α-Al phase and eutectic silicon of the alloy were the smallest, and the morphology of eutectic silicon changed from needle-like in untreated as-cast alloy to fine granular and worm-like. At this time, the Brinell hardness, the tensile strength and elongation of the alloy were HBW76.4, 276 MPa and 4.6%, respectively. Compared with the alloy without ultrasonic treatment, they were increased by 13.02%, 41.54% and 84%, respectively. The fracture mode of the sample was ductile fracture, and the comprehensive mechanical properties of the alloy were significantly enhanced and improved.

关 键 词：AlSi7MgCu2合金 超声处理 显微组织 力学性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG292[金属学及工艺—金属材料]