基于Al-Ti-B细化剂的铝合金异质形核机制研究进展  

Development of Grain Refining Mechanism of Al Alloys by Al-Ti-B Master Alloys

作　　者：韩延峰[1,2] 张瀚龙 徐钧 张佼[1,2] 孙宝德[1,2,3] HAN Yanfeng;ZHANG Hanlong;XU Jun;ZHANG Jiao;SUN Baode(School of Materials Science and Engineering.Shanghai Jiao Tong University.Shanghai 200240.China;Shanghai Key Lab of Advanced High-temperature Materials and Precision Forming.Shanghai Jiao Tong University.Shanghai 200240.China;State Key Laboratory of Metal Matrix Composites.Shanghai Jiao Tong University.Shanghai 200240.China)

机构地区：[1]上海交通大学材料科学与工程学院,上海200240 [2]上海交通大学上海市先进高温材料及其精密成形重点实验室,上海200240 [3]上海交通大学金属基复合材料国家重点实验室,上海200240

出　　处：《中国材料进展》2018年第8期632-637,共6页Materials China

基　　金：国家自然科学基金资助项目(51731007)

摘　　要：综述了Al-Ti-B中间合金细化铝合金的现有理论、假说以及发展趋势,分析了现有异质形核模型的不足。形核相在异质核心上的形核属于液-固相变,熔体与固相质点接触的液/固界面区微结构决定着异质形核过程。从液-固相变角度出发,研究熔体与异质质点间液/固界面区熔体原子有序结构形成及其在随后异质形核过程中的演变规律,将比固-固晶格匹配的唯象分析方法更直接、更真实地反映异质形核的物理过程,据此对异质核心诱导形核相形核的能力进行判定将更为有效。The hypotheses and development on the grain refinement of Al alloys by Al￣Ti￣B master alloys are reviewed.The contradictions and deputies among the present models are discussed.The heterogeneous nucleation of overgrowth phase on the substrate belongs to the liquid￣solid phase transformation,and the structure of corresponding liquid/solid interfaces controls the process of heterogeneous nucleation.Atomic￣scale studies on the structural evolution at the liquid/solid interface during heterogeneous nucleation can provide a more precise description of the physical process of heterogeneous nucleation than that in solid view.

关 键 词：铝合金 凝固 异质形核 晶粒细化 液/固界面 

分 类 号：TG223[金属学及工艺—铸造] TG146.21[一般工业技术—材料科学与工程]