夹杂物对GW103K镁合金服役性能的影响

摘要

研究未净化、MgO陶瓷过滤及JDMJ熔剂净化等净化条件下,夹杂物对GW103K(Mg-10Gd-3Y)合金微观组织、力学性能和腐蚀性能的影响.结果表明:采用JDMJ熔剂净化后的GW103K合金,夹杂物的数量和尺寸明显减少,其抗拉强度和伸长率增加,而屈服强度则低于使用Mg0陶瓷过滤净化和未经净化的合金.此外,随着夹杂物含量的减少,合金的腐蚀速率从2.419 mg/(cm2·d)快速下降到1.265 mg/(cm2·d),当夹杂物含量(体积分数)达到0.385%后,合金的腐蚀速率几乎不再发生变化.建立不同净化条件下夹杂物的体积分数和GW103K合金服役性能的内在联系.%The effects of inclusions on microstructure, mechanical property, corrosion behavior of Mg-10Gd-3Y (GWI03K) alloys by unrefining, MgO ceramic filtering and JDMJ flux refining were investigated, respectively. The results indicate that with decreasing significantly the number and size grade of inclusions for the alloy refined with JDMJ flux, tensile strength and elongation increase; however, the yield strength is less than that of the alloy refined with MgO ceramic filter and unrefined alloy. With the decrease of the inclusions contents, the corrosion rate of the alloys quickly vary from 2.419 mg/(cm2.d) to 1.265 mg/(cm2.d). After inclusion content is reduced to 0.385%, the corrosion rate has almost no changes. Finally, the relationship between the volume fraction of inclusions and service properties of GW 103K alloy under different conditions are established quantitatively.