近液相线铸造法制备稀土铝合金半固态浆料的研究  

Research on Preparation of Semi-solid Rare-earth Aluminum Alloy Slurry by Near-liquidus Casting

作　　者：闫洪[1] 贺儒[1] 李正华[1] 胡志[1,2] 黄昕[1] 

机构地区：[1]南昌大学机电工程学院,江西南昌330031 [2]江西省科学院江西省铜钨新材料重点实验室,江西南昌330029

出　　处：《热加工工艺》2013年第13期1-4,共4页Hot Working Technology

基　　金：国家自然科学基金资助项目(51165032);江西省教育厅资助项目(GJJ11269);江西省高等学校科技创新团队资助项目(00008713);江西省铜钨新材料重点实验室开放基金项目(2011-TW-03)

摘　　要：采用近液相线铸造法制备含稀土La的ADC12铝合金半固态浆料,研究了稀土La含量、保温时间以及保温温度对ADC12铝合金半固态组织的影响。结果表明:ADC12铝合金通过加入稀土La并在液相线附近进行保温处理,能有效地细化枝晶,促进近球状颗粒的形成。加入质量分数为0.6%的La并在585℃保温15 min制备的ADC12铝合金半固态组织细小、均匀,初生α-Al颗粒呈近球状,共晶Si呈细小颗粒状。Semi-solid rare-earth La ADCI2 alloy slurry was prepared by near-liquidus casting method. The effects of rare-earth La content, holding time and holding temperature on the microstructure of semi-solid ADC12 alloy slurry were investigated. The results show that rare-earth La and holding treatment at near-liquidus temperature can effectively refine dendritic and form near-spherical particles. Under the condition of appropriate parameters： 0.6% mass fraction of rare-earth La and holding for 15 min at 585 ℃, the microstructure of semi-solid ADC12 alloy slurry becomes fine and uniform. The primary a-A1 particles become near-spherical shape. The eutectic silicon becomes fine granular shape.

关 键 词：近液相线铸造法 稀土La 半固态 ADC12 

分 类 号：TG249.2[金属学及工艺—铸造]