《Table 1 Tensile properties of the Mg-6Gd-4Y and Mg-6Gd-4Y-1Zn alloy at room temperature》

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《Zn含量对Mg-6Gd-4Y变形镁合金显微组织与力学性能的影响（英文）》

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Note:T6，T5—peak-aged

A comparison of the typical mechanical properties of the two alloys in different states is listed in Table 1.Tensile tests at room temperature reveal that the strengths and elongation of as-cast Mg-6Gd-4Y and Mg-6Gd-4Y-1Zn alloys are relatively low.However，both the strengths and ductility of the two alloys are remarkably improved after extrusion，especially for the GWZ641 alloy，as shown in Table 1.The values of UTS and YTS of the GWZ641 alloy in the as-extruded condition are about 342 and 232 MPa，respectively，with a good elongation of 7.4%.Compared with the GWZ641 alloy in as-cast condition，the UTS is improved by 206 MPa，and the increment of YTS is 112 MPa.The increase in mechanical properties after extrusion is mainly attributed to microstructure refining，which is the result of recrystallization occurring during hot extrusion.Further improvement on tensile properties is achieved by aging.Both T5 and T6treatments result in significant increase of both ultimate and yield strength and the highest ultimate strength of the two alloys.High yield strength（309 MPa），high tensile strength（438 MPa）combined with good ductility（6.8%）is obtained from the GWZ641 alloy after T6 aging.