摘要
用单辊剪切/冷却(shear/cool Roll Process-SCR)连续成形实验机,使液-固反应法合成的AlTi5C0.25合金熔体在强剪切应力场中凝固成形,制备出具有高细化活性的Al-Ti-C晶粒细化剂,研究了SCR连续成形AlTi5C0.25合金组织的形成机制和细化特性.结果表明: SCR连续成形为动态凝固成形过程,该过程对熔体的强烈剪切和热扰动影响自由晶TiC的迁移行为,使TiC粒子在α-Al晶内呈弥散分布,分散细化TiAl3相,使TiC粒子的细化活性显著增强.
An efficiency Al-Ti-C gain refinement master alloy was prepared by using shear/cool roll process (SCR) machine, and the melt of AlTi5C0.25 master alloy synthesized by melt-solid reacting was dynamically and directly solidified in shear stress field. The mechanism of microstructure formation and refinement characteristic of master alloy have been investigated. The results showed that SCR forming of melt was a dynamic solidification process which had drastic shearing and heat disturbance action on melt, and could affect the migration of TiC, made TiC particles distribute dispersely in α-Al, refine the TiAl3 phase, and significantly improve the refinement characteristics of Al-Ti-C master alloy.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2004年第1期82-87,共6页
Chinese Journal of Materials Research
基金
国家自然科学基金50274020
宝钢基金资助项目.
关键词
金属材料
细化活性
单辊剪切/冷却连续成形
AlTi5C0.25合金
动态凝固成形
Aluminum alloys
Deformation
Grain size and shape
Image analysis
Metallographic microstructure
Nucleation
Scanning electron microscopy
Solidification
Transmission electron microscopy
