超声波对AZ31B镁合金凝固组织和力学性能的影响  

Effect of Ultrasonic Wave on Solidified Structure and Mechanical Properties of AZ31B Magnesium Alloy

作　　者：毛大恒[1] 仇灵[1] 李婷[1] 张家富[1] 薛新颖[2] 

机构地区：[1]中南大学机电工程学院 [2]中南大学材料科学与工程学院,长沙410083

出　　处：《机械工程材料》2010年第8期12-14,52,共4页Materials For Mechanical Engineering

基　　金：国家"973"计划资助项目(2007CB613706)

摘　　要：在铸造过程中引入超声场制备出了AZ31B镁合金铸锭,研究了超声波对镁合金凝固组织及轧制后性能的影响。结果表明:在铸造过程中施加超声场,能显著细化AZ31B镁合金铸锭的晶粒,其平均粒径由未加超声场时的250～350μm减小至120μm左右;施加超声场还能促进第二相的析出,强化基体相,提高材料的强度;将铸锭轧制成3.0 mm厚板材后镁合金的抗拉强度和屈服强度分别提高了18.6%和25.8%,而伸长率变化不明显。The ingot of AZ31B magnesium alloy was prepared by casting in ultrasonic field. The effect of ultrasonic wave on solidified structure and properties of the alloy after rolling was studied. The results show that compared with the ingot casted without ultrasonic field the grain size of the AZ31B magnesium alloy ingot after casting in ultrasonic field could reduce from 250- 350μm to 120 μm The ultrasonic vibration promoted the precipitation of the second phase which strengthened the base and improved the strength of the material. The tensile strength and yield strength were improved by 18. 6% and 25. 8% respectively after rolling the magnesium plate to 3. 0 mm, and the elongation value had no significant change.

关 键 词：AZ31B镁合金 铸造 超声波 晶粒尺寸 力学性能 

分 类 号：TG244[金属学及工艺—铸造]