研究了添加Bi元素对AZ61镁合金铸态、固溶态和挤压态组织和力学性能的影响.实验结果表明,向合金中加入Bi后,铸态合金基体中析出了片状和颗粒状的Mg3Bi2相,挤压态合金的组织得到了细化.当加入2%(质量分数)Bi后,挤压态合金的屈服强度和抗拉强度达到最大值,分别为239.4和322.6 MPa.随着Bi含量的进一步增加,粗大的Mg3Bi2相显著增多,加载时割裂基体,导致力学性能降低.
The microstructure and mechanical behaviors of as-cast, solid solution and as-extruded AZ61 (Mg-6wt%Al-1wt%Zn) magnesium alloys with different bismuth additions (0-3wt%) were investigated.The results indicated that with the addition of Bi,some flaky and granular Mg3Bi2 phases were observed in the matrix and the crystal grains of as-extruded alloy were refined effectively.The mechanical properties of the as-extruded AZ61 alloys were modified remarkably with bismuth additions and AZ61 alloy with 2%Bi content was found to exhibit better ultimate tensile strength and yield strength of 322.6 and 239.4 MPa, respectively.When the content of Bi is above 2.0% (mass fraction), the amount of Mg3Bi2 phase increased markedly which split the matrix and deteriorated the tensile strength.
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