MSMT法制备Al-6.6Si铝合金半固态浆料保存过程中组织演变的研究  

Study on the Microstructure Evolution of Al-6.6Si Alloy Semi-solid Slurry Prepared by MSMT during Holding Process

作　　者：梁博[1] 徐骏[1] 曾怡丹[1,2] 张志峰[1] 

机构地区：[1]北京有色金属研究总院国家有色金属复合材料工程技术研究中心,北京100088 [2]内蒙古工业大学,内蒙古呼和浩特010062

出　　处：《铸造技术》2009年第2期164-167,共4页Foundry Technology

基　　金：国家基础研究发展计划(2006CB605203);国家高技术研究发展计划(2006AA03Z115)

摘　　要：采用分散混合流变制浆技术(MSMT法)制备Al-6.6Si铝合金半固态浆料,主要分析研究了合金浆料保存过程中冷却速率、保存时间对浆料组织的影响规律。实验结果表明,冷却速率越大,浆料组织中初生相越细小,圆整度降低,而且冷却速率过大,初生相界面发生失稳,有向枝晶演变的趋势,降低浆料的流动性;保存时间主要影响浆料组织中初生相的形貌,随着保温时间的延长,初生相的圆整度提高,而且初生相尺寸有所增大。Al-6.6Si alloy semi-solid slurry was produced by the technology of melt spreading and mixing （MSMT）, the effect of cooling rate and holding time on the microstructure of semi-solid slurry during holding process was mainly investigated. The results indicate that the size and shape factor of primary a-Al phase decrease with increasing the cooling rate. Furthermore, the interface of primary a-Al phase is tend to destabilize and has the trendency to transform into dendrites if the cooling rate is too large, which decreases the fluidity of slurry. However, holding time mainly affects the morphology of a-Al primary phase, the size and shape factor of primary α-Al phase increase with increasing the holding time.

关 键 词：分散混合流变制浆技术 冷却速率 初生相界面 

分 类 号：TG249.9[金属学及工艺—铸造]