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研究了固溶态Mg-5Sn-1.5Al-1Zn-1Si合金的显微组织,并从理论上分析了合金相的演化过程。结果表明:合金经固溶处理后,合金晶粒出现明显球化,由树枝晶变为球状晶;合金相经溶解与脱溶,析出3~5μm的第二相颗粒。在固溶处理过程中,对于低熔点合金相,通过原子扩散或振动直接溶解到基体中,实现相的分解与形貌变化,对于高熔点合金相,通过基体中的元素浓度平衡实现扩散与分解。
The microstructure of solid solution Mg-5Sn-1.5Al-1Zn-1Si alloy was studied and the evolution of the alloy phase was theoretically analyzed. The results show that the alloy grains are obviously spheroidized and transformed into dendrites by solution treatment. The alloy phase is dissolved and desolvented, and the second phase particles of 3 ~ 5μm are precipitated. In the solution treatment, for the low-melting alloy phase, atom diffusion or vibration directly dissolved into the matrix, phase decomposition and morphological changes, for the high-melting alloy phase, through the matrix element concentration balance to achieve diffusion and decomposition .