机械研磨对医用Mg-6Al-2Ca合金表面组织和性能的影响

发布时间：2018-06-20 18:07

本文选题：Mg-Al-Ca合金 + 机械研磨　；参考：《热加工工艺》2017年22期

【摘要】：通过SEM、表面性能分析和电子拉力试验等手段,研究了表面机械研磨处理对医用Mg-6Al-2Ca镁合金表面组织和力学性能的影响。结果表明:经表面机械研磨处理后,合金表面晶体生长更为规则,其晶粒平均尺寸也越来越细化。随着表面机械研磨时间的增加,合金表面粗糙度和显微硬度也随之增大,表面接触角随之减小。表面机械研磨后,镁合金的拉伸强度和屈服强度增大,而塑性有所降低。机械研磨45 min后,合金的拉伸强度和屈服强度分别增加了29.2%和44.5%,伸长率降低了31.6%。镁合金断口以准解理断裂为主,撕裂棱和尺寸较小的空洞明显增多,表面机械研磨处理时间增加,减小了韧窝数量。
[Abstract]:The effect of surface mechanical grinding on the surface microstructure and mechanical properties of medical Mg-6Al-2Ca magnesium alloy was studied by means of SEM, surface property analysis and electronic tensile force test. The results show that the crystal growth on the surface of the alloy is more regular and the average grain size is more and more fine after the surface mechanical grinding. With the increase of surface mechanical grinding time, the surface roughness and microhardness of the alloy also increase, and the surface contact angle decreases. After surface mechanical grinding, the tensile strength and yield strength of magnesium alloy increased, while the plasticity decreased. After mechanical grinding for 45 min, the tensile strength and yield strength of the alloy increased by 29.2% and 44.5%, respectively, and the elongation decreased by 31.6%. The fracture surface of magnesium alloy is mainly quasi cleavage fracture, the tearing edge and the cavity with small size are increased obviously, the surface mechanical grinding time is increased, and the number of dimples is reduced.
【作者单位】：江苏食品药品职业技术学院机电系;重庆交通大学机电与车辆工程学院;苏州工业职业技术学院机电工程系;
【分类号】：TG146.22;TG580.64

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