CAJ | 학술논문

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170 W,作用时间90 s)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%.
재Mg-8Li-3Al합금적응고과정중,불동공솔적초성파피인입도합금용체중.재초성작용하연구Mg-8Li-3Al합금적미관결구、내부식성능화역학성능.기우초성공화작용급성류작용,대초성세화궤제진행분석.결과표명:재시가초성파후,합금적α상형모종조대적장미상결구변위세소적근구상결구.당초성파공솔위170W시,능구획득세소적구상결구.여몰유시가초성장적합금상비,시가초성장(공솔170 W,작용시간90 s)후적합금내부식성명현제고,역학성능야유흔대개선,항랍강도화신장솔분별제고료9.5%화45.7%.
Ultrasonic vibration was introduced into the Mg-8Li-3Al alloy melt during its solidification process.The microstructure,corrosion resistance and mechanical properties of the Mg-8Li-3Al alloy under ultrasonic vibration were investigated.The experiment results show that the morphology of α 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.