摘要
用XRD、SEM对原位自生法制备的Ti-54Al-（0.8-1.7）B（原子分数,％）合金的相组成和微观组织进行了研究.结果表明:该合金主要由TiAl和TiB2两相组成;合金中TiB2主要以板片状、细棒状和块状形式存在.在板状、细棒状和块状TiB2的{1010}面上生长出相互平行的薄片状凸耳,在（0001）面上生长出相互平行的细棒状分枝;这些凸耳或细棒状分枝的晶体学取向与它们所在的TiB2晶体的取向相同.根据TiB2的晶体结构和生长环境对板片状、细棒状和块状TiB2的形貌演变及生长机理进行了分析.
Microstructure and phase constitution of Ti-54Al-(0.8-1.7)B (atomic fraction, %) alloys produced by an in situ growing method were investigated by XRD and SEM respectively. The results show that these alloys are composed of TiAl and TiB2 phase. TiB2 phase dispersed in TiAl matrix in the morphologies of convoluted flakes, plates, needles and particles. There are some very thin convex flakes growing on {10 (1) over bar0}faces of TiB2 and some pyramidal protrusion or rod shape dendrites on (0001) face of TiB2, which have the same orientation as the primary TiB2. The morphology evolution and growth mechanism of gamma-TiB2 were analyzed according to TiB2 crystal structure and growth condition.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2002年第7期699-702,共4页
Acta Metallurgica Sinica
基金
金属精密热加工国防科技重点实验室开放基金资助项目 99JS61.5.1.ZS6102
