Effects of ultrasonic vibration on solidification structure and properties of Mg-8Li-3Al alloy  

超声振动对Mg-8Li-3Al合金凝固组织及性能的影响(英文)

作　　者：姚磊[1] 郝海[1] 季首华[1] 房灿峰[1] 张兴国[1] 

机构地区：[1]大连理工大学材料科学与工程学院,大连116024

出　　处：《Transactions of Nonferrous Metals Society of China》2011年第6期1241-1246,共6页中国有色金属学报（英文版）

基　　金：Project(2009AA03Z525)supported by the High-tech Research and Development Program of China;Project(NCET-08-0080)supported by the Program of New Century Excellent Talents of the Ministry of Education of China;Project(20082172)supported by the Natural Science Fund of Liaoning Province,China;Project(2009J21DW003)supported by the Science and Technology Fund of Dalian City,China

摘　　要：Ultrasonic vibration was introduced into the Mg-8Li-3A1 alloy melt during its solidification process. The microstructure, corrosion resistance and mechanical properties of the Mg-8Li-3A1 alloy under ultrasonic vibration were investigated. The experiment results show that the morphology of a phase is modified from coarse rosette-like structure to fine globular one with the application of ultrasonic vibration. The fine globular structure is obtained especially when the power is 170 W, and the refining effect also gets better with prolonging the ultrasonic treatment time. The corrosion resistance of the alloy with 170 W of ultrasonic vibration for 90 s is improved apparently compared with the alloy without ultrasonic vibration. The mechanical properties of alloys with ultrasonic vibration are also both improved apparently. The tensile strength and elongation of alloy improve by 9.5% and 45.7%, respectively, with 170 W of ultrasonic treatment for 90 s.在Mg-8Li-3Al合金的凝固过程中,不同功率的超声波被引入到合金熔体中。在超声作用下研究Mg-8Li-3Al合金的微观结构、耐腐蚀性能和力学性能。基于超声空化作用及声流作用,对超声细化机制进行分析。结果表明:在施加超声波后,合金的α相形貌从粗大的蔷薇状结构变为细小的近球状结构。当超声波功率为170W时,能够获得细小的球状结构。与没有施加超声场的合金相比,施加超声场(功率170W,作用时间90s)后的合金耐腐蚀性明显提高,力学性能也有很大改善,抗拉强度和伸长率分别提高了9.5%和45.7%。

关 键 词：Mg-8Li-3A1 alloy ultrasonic vibration corrosion resistance 

分 类 号：TG111.4[金属学及工艺—物理冶金]