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采用金相显微镜、扫描电镜、硬度计和电子拉伸机等研究了不同温度、不同时间的固溶和时效热处理对Mg-Y-NdGd-Zr合金组织和性能的影响。结果表明,随着固溶处理温度升高和时间延长,Mg-Y-Nd-Gd-Zr镁合金晶内化合物减少,晶粒尺寸增大,520℃×8 h的固溶处理工艺最佳。时效时,弥散细小的化合物均匀析出,随着温度升高和时间延长,析出相数量越来越多,合金的组织和力学性能得到进一步改善。经520℃×8 h固溶处理再进行225℃×16 h时效处理后,合金抗拉强度可达到272 MPa,硬度(HV)值达到78左右。
The effects of solution heat treatment and aging heat treatment at different temperatures and different time on the microstructure and properties of Mg-Y-NdGd-Zr alloy were studied by means of metallographic microscope, scanning electron microscope, hardness tester and electronic stretcher. The results show that with the increase of solution treatment temperature and the extension of time, the compound in Mg-Y-Nd-Gd-Zr magnesium alloy decreases and the grain size increases. The solution treatment at 520 ℃ for 8 h is the best. When aging, finely dispersed compounds are uniformly precipitated, and as the temperature increases and the time prolongs, the amount of precipitated phases increases and the microstructure and mechanical properties of the alloy are further improved. After 520 ℃ × 8 h solution treatment for 225 ℃ × 16 h, the tensile strength of the alloy reaches 272 MPa and the hardness (HV) reaches about 78.