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在AM60镁合金中添加不同含量的稀土元素Gd和Y,形成AM60-RE,并进行T4处理。通过高温拉伸力学试验测定合金的抗拉强度和伸长率。结合金相显微组织观察表明,土元素Y和Gd能够通过固溶强化作用减少AM60镁合金在高温拉伸时的软化,并且通过第二相强化减少Mg17Al12相数量以及在130℃时的软化、粗化,改变其形貌;同时Y、Gd与Mg、Al形成的高熔点化合物在130℃时能强化AM60镁合金基体。添加Y和Gd的RE-AM60镁合金在130℃下,铸态抗拉强度可达227 MPa,T4处理后达到236 MPa,与未添加稀土的AM60相比,铸态抗拉强度提高了12.4%,T4态抗拉强度提高了13.5%。
In the AM60 magnesium alloy, different contents of rare earth elements Gd and Y were added to form AM60-RE, and T4 treatment was carried out. Tensile strength and elongation of the alloy were determined by high temperature tensile testing. The results of metallographic microstructures show that Y and Gd can reduce the softening of AM60 magnesium alloy at high temperature by solid solution strengthening and decrease the amount of Mg17Al12 phase and the softening and coarsening at 130 ℃ , Change its morphology; the same time, Y, Gd and Mg, Al compounds formed at 130 ℃ can enhance the AM60 magnesium alloy matrix. The as-cast tensile strength of RE-AM60 magnesium alloy with addition of Y and Gd is as high as 227 MPa at 130 ℃ and 236 MPa after T4 treatment. Compared with AM60 without RE, the as-cast tensile strength increases by 12.4% , T4 state tensile strength increased by 13.5%.