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利用光学显微镜、扫描电镜和X射线衍射仪分析了铸态和固溶态AZ61和AZ61-2Sm合金组织形貌和相组成,测试了其硬度和拉伸力学性能。结果表明,向AZ61合金中添加2%Sm后,铸态组织有所细化,β-Mg17Al12相数量减少和尺寸变小,同时生成小块状的高热稳定性相Al2Sm。经固溶处理后,β-Mg17Al12相完全固溶于α-Mg基体中,只存在Al2Sm相。铸态和固溶态室温拉伸力学性能与AZ61合金相当,而铸态高温拉伸力学性能却显著提高,经固溶后得到进一步提高,与铸态室温相当。
The morphology and phase composition of as-cast and solid solution AZ61 and AZ61-2Sm alloy were analyzed by optical microscope, scanning electron microscopy and X-ray diffraction. The hardness and tensile mechanical properties were tested. The results show that the addition of 2% Sm to AZ61 alloy results in the refinement of the as-cast microstructure, the decrease of the amount and the size of β-Mg17Al12 phase, and the formation of small, high-temperature-stable phase Al2Sm. After solution treatment, the β-Mg17Al12 phase completely dissolved in α-Mg matrix, there is only Al2Sm phase. Tensile mechanical properties of as-cast and solid solution at room temperature are comparable to that of AZ61 alloy, but tensile mechanical properties at as-cast high temperature are remarkably improved, further enhanced after solution treatment, which is equivalent to that at as-cast temperature.