采用光学显微镜、SEM扫描电镜、XRD以及力学性能和电化学测试等手段,研究了不同Y含量对Mg-9Li-3Al合金组织、力学性能和腐蚀性能的影响.结果表明:随着Y的添加,α相的形貌逐渐发生变化,其体积分数也逐渐减少,并形成新的Al2Y相,Al2Y主要分布在β相和α相内部.当Y的添加量为1.6%(质量分数)时,材料的抗拉强度达到最大190.2 MPa;当Y含量为2.0%时,材料的最大延伸率为19.3%.在Y含量低于1.2%时,材料的抗腐蚀性能随Y含量的增加而减小,超过1.2%后,随着Y含量的增加而增加.
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