1 College of Materials Science and Engineering, Chongqing University, Chongqing 400044; 2 College of Materials and Metallurgy, Guizhou University, Guiyang 550025
Abstract: Different solution treatments at 400 ℃, 430 ℃, 460 ℃, 490 ℃ and 520 ℃ were carried out on the rolled Mg-2Gd-2Zn alloy sheets under the same solution time of 0.5 h and aging treatment of 225 ℃×12 h. The effects of solution temperature on the microstructure, phases composition and mechanical properties of the alloy sheets were investigated by OM, SEM, EDS, XRD, micro-hardness and mechanical tester. Below 490 ℃, the grain size increased linearly and the number of the second phase particles decreased with the increasing solution temperature. Whereas the second phase particles suddenly increased and presented dispersed distribution at 490 ℃, which resulted in the highest micro-hardness of 77.88HV. XRD results show that the compositions of second phases have transformed from the primary phase of MgZn2 and GdZn5 at 430 ℃ to the precipitated phase of MgZn2 and GdZn at 490 ℃. Therefore, under 490 ℃, the Mg-2Gd-2Zn alloy sheets present good mechanical properties with the highest tensile strength of 262 MPa, 244 MPa and 254 MPa along the direction of RD, TD and 45°, and elongation of 34%,31% and 39% with low ductility anisotropy, respectively.
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2017, Vol. 31 
