摘要
研究了用液流混合方法(CRP)制备A357半固态浆料时,液流混合、熔体温度和反应器温度等因素对浆料组织的影响。试验结果表明,熔体经过反应器的强制混合后,形成的半固态浆料内部初生相呈细小的近球状,与未经处理的浆料组织相比有显著差异。而低的熔体温度和反应器温度(熔体温度不高于640℃,反应器温度低于300℃)有利于减小初生相尺寸,促进其形成近球状。进一步的分析表明液流混合影响了金属熔体的形核与生长过程,进而改变了凝固组织。
By using the CRP, the influences of forced convection, melt temperature and reactor temperature during solidification on the microstructure of the A357 semi-solid slurry have been investigated. The results show that melt forced mixing can result in the creation of fine spheroidal primary phase in the A357 semi-solid slurry, which is sharply different from that being un-treated by melt mixing. It is helpful for reducing the size and promoting the formation of near-spheroidal shape of primary phase with low melt temperature and reactor temperature, such as the melt temperature less than 640 ℃ and reactor temperature less than 300 ℃. Further analysis reveals that melt mixing can change the solidification structure of the slurry by controlling the nucleation and growth of the primary phase in the melt.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2007年第4期253-255,共3页
Special Casting & Nonferrous Alloys
基金
国家重点基础研究发展计划(973)基金资助项目(2006CB605203)
国家高技术研究发展计划(863)基金资助项目(2006AA03Z115)
