摘要
分析了国内外制浆技术的现状及组织形成的理论,提出了一种新的半固态制浆技术——自孕育法,即采用与合金同成分的本体孕育并经过导流器进一步孕育的方法,并对AM60合金进行了浆料制备试验。通过控制合金熔体温度与局部过冷使之具有大量的晶核,再利用流动冲刷,获得具有非枝晶初生固相的固-液混合浆料。试验结果表明,经过自孕育处理,当温度为650℃、孕育剂加入量为熔体质量的11%时,制备的半固态浆料具有均匀、细小、非枝晶状的微观组织,晶粒平均尺寸仅为51μm。
Semi-solid slurry preparation technologies and mechanism of microstructure formation were surveyed.A novel method for semi-solid slurry preparation that is self-inoculation method(SIM)was presented,in which self-inoculator(the same composition to that of the alloy melt)was introduced into the melt,and then the melt was poured into a fluid director for further inoculation.Solid-liquid mixed slurry with non-dendritic primary phase can be obtained by controlling alloy melt temperature and partial under-cooling to create amounts of nuclei,and by nucleating with self-inoculation nuclei to generate nuclei with a small critical radius for grain growth based on local under-cooling,flow scouring which enhanced self-inoculation effects and promoted grain multipilication and inhibited grain growth.AM60 alloy was used to conduct series of experiments.The results reveal that semi-solid slurry with approximately 51μm in average size,uniform and non-dendritic primary phase is observed with 11% self-inoculator addition after the melt is processed by SIM at 650℃.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2010年第3期227-230,共4页
Special Casting & Nonferrous Alloys
基金
国家重点基础研究发展计划(973计划)资助项目(2007CB613700)
国家自然科学基金资助项目(50964010)
甘肃省国际科技合作计划资助项目(090WCGA894)
