Papers by Author: Yue Wang

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.

Abstract: High-temperature tensile and fracture behaviors of as-extruded ZK60 alloy were investigated. It was evident from the experiments that with decreasing temperature and increasing strain rate, the 0.2% offset yield strength and ultimate tensile strength of the alloy increased while the elongation to failure decreased. The flowing stress of as-extruded ZK60 alloy during plastic deformation was proportioned to the reciprocal of temperature. At the initial strain rate of 5×10-4s-1, the calculated active energy at 300°C was about 93.4 kJ/mol.

Abstract: Fully-reversed total-strain-amplitude-controlled fatigue tests were performed in laboratory air at room temperature for the magnesium alloy AZ91. Experimental results showed that during the experiment significant cyclic strain hardening occurred throughout the imposed strain amplitudes. It was found that the relationship between plastic strain amplitude, elastic strain amplitude and reversals to failure can be well described by Basquin and Coffin-Manson equations. In addition, the strain fatigue parameters of the AZ91 alloy were determined through analyzing the corresponding strain fatigue life data.