论文部分内容阅读
采用光学显微镜、X射线衍射、扫描电镜以及硬度试验等手段,研究了固溶和时效处理对Mg-2Er-1Zn-0.18Zr合金组织的影响。结果表明,Mg-2Er-1Zn-0.18Zr铸态合金主要由α-Mg相和X-Mg12ErZn相组成;合金的最佳固溶工艺为540℃×32 h,在该工艺条件下X-Mg12ErZn完全溶入α-Mg基体中,析出大量的W-Mg3Er2Zn3相,且晶粒没有明显长大;随后合金经过180℃的时效处理,与固溶态合金相比,Mg-2Er-1Zn-0.18Zr时效态合金组织变化不明显,仍由α-Mg相和W-Mg3Er2Zn3相组成,合金的显微硬度值变化不大。
The effects of solution treatment and aging treatment on the microstructure of Mg-2Er-1Zn-0.18Zr alloy were investigated by optical microscopy, X-ray diffraction, scanning electron microscopy and hardness test. The results show that the as-cast Mg-2Er-1Zn-0.18Zr alloy mainly consists of α-Mg phase and X-Mg12ErZn phase. The optimum solid solution process of the alloy is 540 ℃ × 32 h. Under the optimum conditions of X-Mg12ErZn Mg-2Er-1Zn-0.18Zr aging in the α-Mg matrix, precipitating a large amount of W-Mg3Er2Zn3 phase, and the grain did not grow significantly; then the alloy after 180 ℃ aging treatment, compared with the solid solution alloy Microstructure of the alloy is not obvious changes, still by the α-Mg phase and W-Mg3Er2Zn3 phase composition, the microhardness of the alloy little change.