摘要
以细化Al-18Si-xFe合金中强化相为目的,提出了一种波浪形倾倾斜板流变铸造(WSP)制备过共晶Al-18Si-xFe合金的方法,并对合金在波浪形流动与冷却过程中的组织形成机理进行了研究。结果表明,采用WSP流变铸造可以明显改善Al-18Si与Al-18Si-5Fe合金中初生Si、Al18Si10Fe5和Al8Si2Fe相的形貌。随着浇注温度降低和倾倾斜板冷却作用的加强,各相趋于细化和球化。WSP流变铸造过程中合金组织的形成源于3种机制的作用:结晶雨带来的晶核增殖,倾倾斜板强冷却作用下抑制晶体生长和流动剪切作用下的晶体破碎。
In order to refine reinforced-phase in Al-18Si-xFe alloy,a novel method of wavelike sloping plate(WSP)rheocasting process for preparing hypereutectic Al-18Si-xFe alloy was proposed,and microstructure formation mechanism of the alloy during wavelike flow and cooling process was investigated.The results show that morphology of primary Si,Al18Si10Fe5and Al8Si2Fe phase in the Al-18Si and Al-18Si-5Fe alloy can be refined greatly by the WSP rheocasting.With the decrease of pouring temperature and the increase of cooling strength of sloping plate,various phases tend to be refined and spheroidized.Formation of microstructure in the alloy can be attributed to crystal nucleus multiplication brought by crystallization rain,crystal restraining growth under strong cooling of sloping plate and crystal broken-up under flow shearing.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2011年第1期1-4,101,共4页
Special Casting & Nonferrous Alloys
基金
国家自然科学基金重点资助项目(51034002)
国家自然科学基金资助项目(50974038)
中央高校基本科研业务费资助项目(N090502003)
