论文部分内容阅读
研究了3种成分的Mg-11Gd-(1,1.5,2)Zn合金的显微组织和力学性能。结果表明,合金的铸态显微组织均由α-Mg基体、(Mg,Zn)3Gd共晶相和14H型LPSO相组成。铸态组织中(Mg,Zn)3Gd相的体积分数随Zn含量的增加而增大,且其热稳定性不断提高。同时,合金中LPSO相的体积分数也随Zn含量的增加而逐渐增大。合金在常温时的抗拉强度随着Zn含量的增加而降低,其中Zn含量较少的Mg-11Gd-1Zn合金在T6处理后呈现最高的强度和良好的塑性。当Zn含量较多时,合金T6处理的效果却远低于T5处理。随Zn含量的增加,合金在200℃高温下的抗蠕变性能也略有下降,但3种合金的抗蠕变性能都优于WE54合金。
The microstructure and mechanical properties of Mg-11Gd- (1,1.5,2) Zn alloy with three components were studied. The results show that the as-cast microstructures of the alloys consist of α-Mg matrix, (Mg, Zn) 3Gd eutectic phase and 14H LPSO phase. The volume fraction of (Mg, Zn) 3Gd phase in as-cast microstructure increases with the increase of Zn content, and the thermal stability of the as-cast phase increases. At the same time, the volume fraction of LPSO phase in the alloy increases with the increase of Zn content. The tensile strength of the alloy decreases with the increase of Zn content. The Mg-11Gd-1Zn alloy with less Zn content shows the highest strength and good ductility after T6 treatment. When the content of Zn is higher, the effect of alloy T6 is much lower than that of T5. With the increase of Zn content, the creep resistance of the alloy decreases slightly at 200 ℃, but the creep resistance of the three alloys is better than that of WE54 alloy.