Investigations on Hot Tearing Susceptibility and its Mechanism of Mg-Zn-Y Alloys

Abstract:

Hot tearing sensitivity of MgZn_2.5Y_xZr_0.5(x=0.5,1,2,4,6) alloys were predicted by using thermodynamic calculations based on Clyne-Davies’ model, and verified experimentally by using a "T"-type hot tearing permanent-mold equipment. The hot tearing mechanism with different Y content of MgZn_2.5Y_xZr_0.5 alloys was investigated. The results demonstrated that the predicted values are consistent with that of measured values. The hot tearing susceptibility of the alloys from high to low are: MgZn_2.5Y₂Zr_0.5 > MgZn_2.5Y_0.5Zr_0.5 > MgZn_2.5Y₄Zr_0.5 > MgZn_2.5Y₁Zr_0.5 > MgZn_2.5Y₆Zr_0.5. Among the studied alloys, the hot tearing sensitive of the alloys of MgZn_2.5Y₁Zr_0.5 and MgZn_2.5Y₆Zr_0.5 is less than that of the commercial alloy AZ91.

• Periodical: Materials Science Forum (Volume 879)
• Pages: 1164-1169
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.879.1164
• Online since: November 2016
• Authors: Zheng Liu*, Li Liu, Si Bo Zhang, Zhi Wang, Ping Li Mao, Yue Wang
• Keywords: Hot Tearing Formation Mechanism, Hot Tearing Sensitivity, Mg-Zn-Y Alloy, Solidification Curve

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