摘要
采用等离子旋转电极雾化（PREP）法制备了高温Ti Al预合金粉末,该粉末粒度主要在46~150μm之间,其粒度呈现双峰分布。高温Ti Al预合金粉末的快速冷凝组织及相组成与粒度有关,一般大粒径粉末冷凝组织为枝状结构,小粒径粉末呈光滑状;该预合金粉末相主要由α2相组成,小于46μm粒径的粉末含有一定β相,大于200μm粒径的粉末出现γm相。不同粒度的粉末由于不同的相组织结构对热等静压致密化坯体组织具有一定遗传效应,粗粒度粉末在热等静压后坯体中易形成原始粉末颗粒边界或粗化的片层组织。
High-temperature TiA1 pre-alloyed powder was produced by Plasma Rotating Electrode Process （PREP）, and its characteristics were investigated. The results show that the as-prepared particle size mostly ranges from 46 μm to 150 μm, and its distribution is bimodal distribution. The freezing microstructure and phase of pre-alloyed powder are related to its granularity. The microstructure of powder with large particle size is usually dendritic structure, while that with small particle size shows smooth surface. The phase of as-prepared powder is mainly hexagonal a2 phase, but powder with particle size less than 46 μm contains some β phase, and powder with particle size larger than 200 μm has a small amount of γm phase. It is obvious that the powder with different phase and microstructure has an inherited effect on the densification microstructure formed by hot isostatic pressing. Powder with large particle size is prone to forming the coarsening lamellae structure and residual powder boundary in the densification microstructure.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2014年第11期2768-2773,共6页
Rare Metal Materials and Engineering
基金
国家自然科学基金(52075338)
国家重点基础研究发展计划(2011CB605505)
关键词
Ti
Al
粉末
高温
组织
致密化
TiAl
powder
high-temperature
microstructure
densification
