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利用冷轧与半固态热处理工艺(冷轧SIMA法)制备了AZ91D镁合金半固态坯料,研究了不同冷轧压下量对半固态坯料显微组织与压缩性能的影响,并探讨了固相颗粒的球化机制与半固态坯料的成形机制。结果表明:随着冷轧压下量的增加,固相颗粒的平均尺寸逐渐的减小、球形率逐渐地增大,液相率逐渐地增大,而半固态坯料的压缩性能呈先升后降的趋势;当冷轧压下量低于8.72%时,对半固态坯料显微组织的影响较为敏感。半固态加热时,固相颗粒的原子尺度界面由光滑小晶面转变为粗糙非小晶面,宏观表现为多边形转变为球形;且随着冷轧压下量的增大,该球形化过程的转变速度显著提高。
The semi-solid AZ91D magnesium alloy billet was prepared by cold rolling and semi-solid heat treatment (SIMA method). The effects of different cold rolling reduction on microstructure and compressive properties of semi-solid billet were investigated. Spheroidization Mechanism and Forming Mechanism of Semi-solid Blanks. The results show that with the increase of cold rolling reduction, the average size of solid particles decreases gradually, the spherical fraction increases gradually and the liquid fraction increases gradually, while the compressive property of semi-solid billet first increases When the cold rolling reduction is less than 8.72%, the semi-solid billet microstructure is more sensitive. In the semi-solid state heating, the atomic-scale interface of the solid phase particles changes from a smooth crystallographic plane to a rough non-crystallographic plane, and the macroscopic representation changes from a polygonal to a spherical shape; and as the cold rolling reduction increases, The speed of change is significantly higher.