Xiao-ping Luo, Su-e Dang, Ya-qing Zhang
School of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan, 030024, Shanxi, China.
Microsc Res Tech. 2015 Jan;78(1):65-9. doi: 10.1002/jemt.22446. Epub 2014 Oct 23.
The effect of different Ca contents on the microstructure and mechanical properties of Mg-5Al-1Bi-0.3Mn (AMB501) magnesium alloys was investigated by conventional melting and casting technique using different Ca contents (1.0, 2.0, and 3.0 wt %). Increasing the Ca content resulted in higher hardness and yield strength, but decreased elongation. The improved tensile properties of the AM50-1Bi-xCa alloys were due to the changes in AMB501 alloy microstructure when the Ca content increased, as demonstrated by scanning electron microscope, energy dispersive spectrum, and X-ray diffractometer. The alloy microstructure indicated that the amount of β-Mg17 Al12 phase on grain boundaries decreased and the morphology of β-Mg17 Al12 phase on grain boundaries changed from quasicontinuous-net shape to dispersed particles. The Mg17 Al12 phase disappeared and a new secondary phase Al2 Ca appeared after a 3.0 wt % Ca addition.
采用传统熔炼铸造技术，研究了不同钙含量（1.0、2.0和3.0 wt%）对Mg-5Al-1Bi-0.3Mn（AMB501）镁合金微观结构和力学性能的影响。钙含量的增加导致硬度和屈服强度提高，但伸长率降低。扫描电子显微镜、能谱仪和X射线衍射仪分析表明，AMB50-1Bi-xCa合金拉伸性能的改善归因于钙含量增加时AMB501合金微观结构的变化。合金微观结构显示，晶界上β-Mg17Al12相的数量减少，晶界上β-Mg17Al12相的形态从准连续网状变为弥散颗粒状。添加3.0 wt%钙后，Mg17Al12相消失，出现了新的第二相Al2Ca。
