Ultrasonic Vibration and Rheocasting for Refinement of Mg-Zn-Y Alloy Reinforced with LPSO Structure

作者：Lu, Shulin; Yang, Xiong; Hao, Liangyan; Wu, Shusen^*; Fang, Xiaogang; Wang, Jing

来源：Metals and Materials International, 2018, 24(6): 1315-1326.

DOI：10.1007/s12540-018-0125-4

• Alloy
• Ultrasonic vibration
• Semisolid processing
• Microstructure
• Mechanical properties

In this work, ultrasonic vibration (UV) and rheo-squeeze casting was first applied on the Mg alloy reinforced with long period stacking ordered (LPSO) structure. The semisolid slurry of Mg-Zn-Y alloy was prepared by UV and processed by rheo-squeeze casting in succession. The effects of UV, Zr addition and squeeze pressure on microstructure of semisolid Mg-Zn-Y alloy were studied. The results revealed that the synergic effect of UV and Zr addition generated a finer microstructure than either one alone when preparing the slurries. Rheo-squeeze casting could significantly refine the LPSO structure and -Mg matrix in Mg96.9Zn1Y2Zr0.1 alloy without changing the phase compositions or the type of LPSO structure. When the squeeze pressure increased from 0 to 400MPa, the block LPSO structure was completely eliminated and the average thickness of LPSO structure decreased from 9.8 to 4.3m. Under 400MPa squeeze pressure, the tensile strength and elongation of the rheocast Mg96.9Zn1Y2Zr0.1 alloy reached the maximum values, which were 234MPa and 17.6%, respectively, due to its fine -Mg matrix (1-Mg and 2-Mg grains) and LPSO structure.

• 出版日期2018-11
• 单位华中科技大学