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

        Shulin Lü,Xiong Yang,Liangyan Hao,Shusen Wu,Xiaogang Fang,Jing Wang 대한금속·재료학회 2018 METALS AND MATERIALS International Vol.24 No.6

        In this work, ultrasonic vibration (UV) and rheo-squeeze casting was first applied on the Mg alloy reinforced with long periodstacking ordered (LPSO) structure. The semisolid slurry of Mg–Zn–Y alloy was prepared by UV and processed by rheosqueezecasting in succession. The effects of UV, Zr addition and squeeze pressure on microstructure of semisolid Mg–Zn–Yalloy were studied. The results revealed that the synergic effect of UV and Zr addition generated a finer microstructure thaneither one alone when preparing the slurries. Rheo-squeeze casting could significantly refine the LPSO structure and α-Mgmatrix in Mg96.9Zn1Y2Zr0.1alloy without changing the phase compositions or the type of LPSO structure. When the squeezepressure increased from 0 to 400 MPa, the block LPSO structure was completely eliminated and the average thickness ofLPSO structure decreased from 9.8 to 4.3 μm. Under 400 MPa squeeze pressure, the tensile strength and elongation of therheocast Mg96.9Zn1Y2Zr0.1alloy reached the maximum values, which were 234 MPa and 17.6%, respectively, due to its fineα-Mg matrix (α1-Mg and α2-Mg grains) and LPSO structure.

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