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通过专门设计的可以检测镁合金凝固收缩行为的试验装置,对Zn含量分别为2%,6%和10%的3种Mg-Zn二元合金在自由收缩与受阻收缩两种状态下冷却过程中的冷却温度、收缩位移与收缩应力变化进行检测,进而获得可以表征合金热裂敏感性的应力累积系数及其出现时的固相率区间和自由线收缩过程中的最大线收缩率指标。结果表明,在Zn含量低于最大固溶度时,随着Zn含量的提高,Mg-Zn二元合金的热裂倾向降低,但Zn含量大于最大固溶度的亚共晶Mg-10Zn合金则表现出冷裂的特点。
Through specially designed test device that can detect the solidification and shrinkage behavior of magnesium alloy, the mechanical properties of three kinds of Mg-Zn binary alloys with 2%, 6% and 10% Zn content were respectively cooled in free-shrinkage and shrinkage-shrinkage The shrinkage displacement and the shrinkage stress of the alloy were measured, and then the stress cumulative coefficient which can characterize the thermal cracking susceptibility of the alloy and the maximum linear shrinkage index of the solid fraction interval and the free-line shrinkage at the time of occurrence were obtained. The results show that the hot cracking tendency of Mg-Zn binary alloys decreases with the increase of Zn content when the Zn content is lower than the maximum solid solubility, but the hypo-eutectic Mg-10Zn alloy with Zn content greater than the maximum solid solubility Showing the characteristics of cold cracking.