The effects of Ag (0, 0.5, 1, and 2 wt%) content on the microstructure and mechanical properties of SLMed AZ61 Mg–Al–Zn alloy in the as-deposited and heat-treated conditions were investigated. The microstructure of SLMed AZ61 Mg–Al–Zn alloy is composed of α-Mg matrix and eutectic of α-Mg and Mg₁₇Al₁₂ phase at grain boundaries. The addition of Ag inhibited the growth of β-Mg₁₇Al₁₂ phase and further refined the grain size. After adding 2 wt% Ag, the volume fraction of β-Mg₁₇Al₁₂ phase is decreased from 40.53 to 30.27%, and the average grain diameter is decreased from 2.35 to 1.82 μm. Mg₅₄Ag₁₇ phase particles were formed after Ag was added and distributed in the grain boundary, which was beneficial to enhance the mechanical properties of Mg–Al alloy. After 8-h solution treatment at 420 °C β-Mg₁₇Al₁₂ phase was basically dissolved in α-Mg matrix, which was beneficial to the precipitation of discontinuous β phase during aging treatment, and this discontinuous β phase could effectively enhance the strength of Mg–Al alloy. When the content of Ag is 2 wt%, the mechanical properties and corrosion resistance of Mg–Al alloy are enhanced. After solution treatment, the mechanical properties of Mg–Al alloy are decreased, but the corrosion resistance is greatly enhanced. After aging treatment, the mechanical properties are increased, but the corrosion resistance is decreased.

研究了在沉积和热处理条件下，Ag（0、0.5、1和2 wt％）含量对SLMed AZ61 Mg-Al-Zn合金的显微组织和力学性能的影响。SLMed AZ61 Mg-Al-Zn合金的显微组织由α-Mg基体和晶界处的α-Mg和Mg ₁₇ Al ₁₂相共晶组成。Ag的添加抑制β-Mg系的生长₁₇的Al ₁₂相和进一步细化晶粒尺寸。加入2重量％的Ag，β-Mg系的体积分数后₁₇的Al ₁₂相从40.53降至30.27％，且平均晶粒直径减小从2.35到1.82微米。镁₅₄ Ag ₁₇添加银并分布在晶界后形成相颗粒，这有利于增强Mg-Al合金的力学性能。8-H固溶处理后在420℃下β-Mg系₁₇的Al ₁₂相基本上溶解在α-Mg基体，有利于时效处理中不连续β相的析出，这种不连续β相可有效提高Mg-Al合金的强度。当Ag含量为2 wt％时，Mg-Al合金的机械性能和耐蚀性得到增强。固溶处理后，Mg-Al合金的力学性能下降，但耐蚀性大大提高。经过时效处理后，机械性能提高，但耐蚀性降低。