论文部分内容阅读
研究了添加不同含量的锶(Sr)及固溶处理(T4)对AM50镁合金显微组织和高温(150℃)拉伸性能的影响。结果表明:当Sr加入量为0.7wt%和1.4wt%时,AM50合金中形成了层片状的Al4Sr新相,而Mg17Al12相被抑制形成,固溶处理使Al4Sr相由层片状转变为颗粒状。当Sr加入量为2.8wt%和3.5wt%时,AM50合金中形成了骨骼状的Sr5Al9新相,固溶处理使热稳定性较高的Sr5Al9相由骨骼状向层片状和颗粒状转变。加入Sr能细化晶粒并显著提高合金在150℃下的拉伸性能,固溶处理明显提高了AM50-2.8Sr和AM50-3.5Sr合金高温下的抗拉强度,但对AM50-0.7Sr和AM50-1.4Sr合金高温拉伸性能影响较小。
The effects of different content of Sr and solution treatment (T4) on the microstructure and tensile properties of AM50 magnesium alloy at 150 ℃ were studied. The results show that when Sr is added in an amount of 0.7wt% and 1.4wt%, a lamellar Al4Sr phase is formed in the AM50 alloy while the Mg17Al12 phase is inhibited. The solution treatment converts the Al4Sr phase from lamellae to particles shape. When the addition amount of Sr is 2.8wt% and 3.5wt%, a new skeletal Sr5Al9 phase is formed in the AM50 alloy. The solution heat treatment results in the transformation of Sr5Al9 phase with high thermal stability from skeletal to lamellar and granular. The addition of Sr can refine the grains and significantly improve the tensile properties of the alloy at 150 ℃. The solution treatment significantly improves the tensile strength of AM50-2.8Sr and AM50-3.5Sr alloys at high temperature, but the effect of AM50-0.7Sr and AM50-1.4Sr alloy high temperature tensile properties less affected.