论文部分内容阅读
研究了加压条件下镁合金ZM6合金凝固组织变化特征,特别是第二相β-Mg17Al12的生成和演变机制,并进一步研究了其力学性能变化。结果表明,加压可改变合金的凝固速率,进而改变初生相的固溶度,导致β相来不及析出而数量减少;同时加压试样的凝固组织内晶粒有所细化,晶界周围几乎无短棒状第二相析出,且晶界宽度小;拉伸性能和显微硬度有所提高。
The variation of solidification microstructure of ZM6 alloy was studied under pressure, especially the formation and evolution mechanism of the second phase β-Mg17Al12. The mechanical properties of ZM6 alloy were also studied. The results show that the pressure can change the solidification rate of the alloy, and then change the solid solubility of the primary phase, resulting in less precipitation than the β phase and reduce the number; at the same time the sample was solidified within the grain refinement, grain boundaries almost No short rod-like second phase precipitation, and the grain boundary width is small; tensile properties and microhardness increased.