Growth morphology and microstructural characterization of nonstoichiometric Ti 2 AlC bulk synthesized by self-propagating high temperature combustion synthesis with pseudo hot isostatic pressing
International Journal of Refractory Metals and Hard Materials(2014)
摘要
Ti2AlC bulk pellets, Φ150×25mm2 in size, were fabricated by self-propagating high temperature combustion synthesis with pseudo hot isostatic pressing (SHS/PHIP). The growth morphology and microstructures were investigated in detail by X-ray diffraction, scanning electron microscopy, and high-resolution transmission electron microscopy. The used SHS/PHIP process results in some unusual microstructures. The relative density increases to over 98% when increasing the size of the used pellet. The as-fabricated Ti2AlC has many lattice defects, contributing to its low phonon thermal conductivity. Interestingly, many nanopores were present in Ti2AlC grains. Of much importance, a high density of vacancies contributes to the nonstoichiometry of Ti2AlC synthesized by the SHS/PHIP process. Ti2AlC synthesized by the SHS/PHIP process is deformed with high residual stress, due to fast cooling and grain growth.
更多查看译文
关键词
Defects,Crystal morphology,Transmission electron microscopy,MAX phases
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要