方晓刚,吴树森.超声功率对Mg-3Re-3Zn-0.7Y合金组织和力学性能的影响[J].稀有金属材料与工程,2016,45(1):7~12.[Fangxiaogang,Wu Shusen.Effect of ultrasonic power on microstructure and mechanical properties of Mg-3Re-3Zn-0.7Y alloy[J].Rare Metal Materials and Engineering,2016,45(1):7~12.]
超声功率对Mg-3Re-3Zn-0.7Y合金组织和力学性能的影响
投稿时间:2013-12-20  修订日期:2014-01-03
中文关键词:  Mg-3RE-3Zn-0.7Y 合金  超声功率  半固态浆料  组织;力学性能
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目);国家教育部博士点基金
中文摘要:
      如果在铸造过程能够细化含有稀土元素的金属间化合物,那么稀土镁合金在耐热应用方面将具有巨大的潜力。本文研究了半固态制浆过程中不同超声功率的超声振动对Mg-3RE-3Zn-0.7Y合金半固态微观组织以及铸态试样力学性能的影响。试验对液相线以上20~40癈镁合金熔体分别施加超声功率为800W至1200W的超声振动,振动时间为90s,结束超声振动温度为液相线以下10℃左右。结果表明,超声振动可以制备出组织中具有细小圆整的初生α-Mg相的优良半固态浆料,并且经过超声功率为1000W的超声处理后浆料组织中初生α-Mg晶粒的平均晶粒直径和平均形状系数SF分别为55μm和0.63。此外,1000W超声处理的铸件试样比未经超声处理的试样抗拉强度提高了25.2%,伸长率提高了93.5%。可见,声空化效应和声流效应使超声振动成为一种制备具有细小圆整初生晶粒的镁合金半固态浆料的有效途径。
Effect of ultrasonic power on microstructure and mechanical properties of Mg-3Re-3Zn-0.7Y alloy
英文关键词:Mg-3RE-3Zn-0.7Y alloy  ultrasonic power  semisolid slurry  microstructure  mechanical properties
英文摘要:
      The Rare Earth (RE) containing Mg cast alloys have big potential to be used for heat-resistant applications, on condition that the RE-containing intermetallic compounds can be refined during the casting process. In this research, the effect of Ultrasonic Vibration (USV) with different powers on microstructure and mechanical properties of the semi-solid Mg-3RE-3Zn-0.7Y alloys has been investigated. The Mg alloy melt at temperature of 20?40 癈 above the liquidus was exposed to USV for 90 s with different powers from 800W to 1200W, and the USV ended about 10癈 below the liquidus. The results show that good semi-solid slurry with fine and spherical α-Mg particles could be obtained, and the primary α-Mg crystals are with average particle size of 55 μm and average shape coefficient of 0.63 after USV with 1000 W power. After USV treatment with the power of 1000 W, the ultimate tensile strength and elongation of the casting samples were 25.2% and 93.5% higher than those of the samples without USV treatment respectively. It can be concluded that ultrasonic vibration is a good method to prepare semi-solid slurry of Mg alloy with fine and relatively round primary crystals due to cavitation and acoustic streaming effects.
作者单位E-mail
方晓刚 华中科技大学 kellyfox_3026@qq.com 
吴树森 华中科技大学 ssw636@hust.edu.cn 
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