摘要
本文对ＴｉＡｌ合金激光表面合金化表面改性层中ＴｉＣ生长形态的生长过程及机理进行了研究，发现在冷却速度为１０２℃／ｓ量级的准快速凝固条件下，ＴｉＣ型ＭＣ碳化物在微观上具有极为规则“砖块分叉堆砌”生长特征的发达树枝状生长形态，其生长机制是密排面生长台阶沿双“之”字形轨迹侧向推进的“砖块分叉堆砌”
The growth morphology and mechanism of a MC carbide (TiC type) under quasi-rapidsolidification conditions of laser surface alloyed coatings on a titantium aluminide alloy are studied. TheMC carbide under quasi-rapid solidification conditions with a cooling rate of about (4 10~2) C /s is foundto have an unique dendritic morphology having strong faceted and brick-stacking growth characteristicson dendrite arms. The growth mechanism is a brick-stacking/ double-zigzag micro-branching mechanismoriginating from lateral growth on the intersecting {111} planes.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
1999年第12期1246-1248,共3页
Acta Metallurgica Sinica
基金
国家自然科学基金
国家教委优秀年轻教师基金
航空基础科学基金
关键词
碳化物
准快速凝固
激光表面合金化
生长机制
MC carbide, TiC, quasi-rapid solidification, laser suface alloying, growth mechanism
