热处理工艺对AZ80镁合金显微组织的影响

摘要

The effects of solution-aging and annealing treatment on microstructure of AZ80 magnesium alloy are investigated by means of optical microscopy, scanning electron microscopy and X-ray diffraction. The results show that the single supersaturated solid solution can be obtained after solution treatment, and that the β-Mg17Al12 phase is separated out from ot-Mg matrix with discontinuous and continuous precipitations in the subsequent aging treatment. During the slow cooling process of annealing treatment, the lamellar β-Mg17Al]2 phase is precipitated from a-Mg matrix. The lamellar β-Mg17Al12 phase can be transformed into nodular β-Mg17Al12 phase by dissolving themselves in the following spheroidizing treatment. Then, the small, uniform and nodular β-Mg17Al12 phase can be obtained.%利用光学显微镜、扫描电子显微镜、X射线衍射仪等分析手段研究了固溶时效及退火工艺对AZ80铸造镁合金显微组织的影响.结果表明,固溶处理可获得单相α-Mg固溶体组织；在随后的时效处理中β-Mg17Al12相以连续析出和不连续析出两种方式重新析出；在退火处理的缓慢冷却过程中β-Mg17Al12相以层片状形式析出；退火后的球化处理使层片状β-Mg17Al12相通过自身溶断的方式获得均匀细小的球状β-Mg17Al12相.