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采用原位合成技术制备Mg2Si颗粒增强Al-18%Si-Mg复合材料,并对其进行熔体过热和Sr变质处理。研究过热温度、保温时间对Al-18%Si-Mg合金中颗粒状Mg2Si增强相的显微组织和室温力学性能的影响。结果表明:经熔体过热处理后Al-18%Si-Mg合金凝固组织得到了明显的改善,使具有树枝状或汉字状特征的Mg2Si相逐渐向十字形转变且球化趋势明显。处理工艺为过热温度860℃,保温时间25 min时,Mg2Si相均匀细小,平均尺寸由处理前的34μm减小到11.42μm,复合材料的力学性能也得到明显改善。
In-situ synthesis of Mg2Si particles reinforced Al-18% Si-Mg composite material, and its melt overheating and Sr metamorphic treatment. The effects of superheating temperature and holding time on the microstructure and room temperature mechanical properties of the particulate Mg2Si reinforcement in Al-18% Si-Mg alloy were investigated. The results show that the solidified microstructure of Al-18% Si-Mg alloy after melt overheating has been obviously improved, and the Mg2Si phase with dendritic or kink-shaped features gradually turns into a crisscross pattern with obvious spheroidization. The treatment process is superheat temperature of 860 ℃, holding time of 25 min, Mg2Si phase is uniform and small, the average size reduced from 34μm before treatment to 11.42μm, the mechanical properties of composites have also been significantly improved.