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通过SEM、光学显微镜、失重测量、拉伸测试等方法研究了热挤压加工对不同Gd含量的AM50GdX镁合金的显微组织及腐蚀力学性能的影响。结果表明:热挤压后,合金内部出现了具有方向性的平行纤维变形组织;随着Gd含量的增加,AM50GdX镁合金组织中β-Mg_(17)A_l(12)相数量减少而Al_2Gd_3相数量和体积增加;1%Gd元素对合金耐蚀性提升作用最大;热挤压处理使合金的晶粒细化,从而使拉伸强度提升了接近50%;由于热挤压处理和1%Gd元素的存在大大改善了AM50镁合金的腐蚀剩余强度性能。
The effects of hot extrusion process on microstructure and corrosion mechanics properties of AM50GdX magnesium alloy with different Gd content were studied by SEM, optical microscope, weight loss measurement and tensile test. The results show that the parallel fiber deformation structure with orientation exists in the alloy after hot extrusion. With the increase of Gd content, the amount of β-Mg_ (17) A_l (12) phase in AM50GdX magnesium alloy decreases and the amount of Al_2Gd_3 phase And volume increase; 1% Gd has the greatest effect on the corrosion resistance of the alloy; hot extrusion treatment makes the alloy grain refinement, thus increasing the tensile strength by nearly 50%; due to hot extrusion and 1% Gd element The existence of greatly improved AM50 magnesium alloy corrosion residual strength properties.