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论述了AlSi7Mg合金坯料结构演化过程中的固相颗粒尺寸及分布、颗粒形貌、颗粒团聚化程度等影响因素 ,研究了在半固态状态下合金的结构演化对AlSi7Mg合金变形行为的影响。结果表明 ,在半固态状态下 ,亚共晶AlSi7Mg合金坯料的触变变形行为密切依赖于固相的结构和试样在压缩变形前的固相结构演化。初始非枝晶结构或枝晶演化成球状化结构能在很低的应力下变形。在完全球状化条件下 ,固相颗粒尺寸对应力水平没有明显影响。
The influence factors such as size and distribution of solid phase particles, particle morphology and degree of particle agglomeration during the evolution of AlSi7Mg alloy billet structure were discussed. The effect of structural evolution of AlSi7Mg alloy on the deformation behavior of AlSi7Mg alloy was studied. The results show that in the semi-solid state, the thixotropic deformation behavior of the hypoeutectic AlSi7Mg alloy billet closely depends on the structure of the solid phase and the solid-phase structure evolution of the sample before compressive deformation. The initial non-dendritic structure or dendrite evolution into a spheroidized structure can be deformed under very low stress. Under fully spheroidized conditions, the size of the solid particles does not have a significant effect on the stress level.