摘要
The effects of heat treatment on the microstructure and compressive properties of porous Ni-rich NiTi shape memory alloy (SMA) fabricated by self-propagating high-temperature synthesis (SHS) were investigated. The solution treatment at 1050℃ has little effects on stable Ti2Ni second phase, however, it decreases the amount of Ni4Ti3 phase derived from the SHS process and results in the improvement of the ductility of porous NiTi SMA. The subsequent aging treatment after solution treatment could lead to the precipitation of the discrete Ni4Ti3 phase in NiTi matrix grains, which increases the brittleness of porous NiTi SMA. Porous NiTi SMA presents a composite fracture behavior consisting of a ductile fracture of NiTi matrix and a cleavage fracture of second phase particles. Many cracks existing on the interfaces indicate that the bonding of the matrix with second phase particles is weak.
The effects of heat treatment on the microstructure and compressive properties of porous Ni-rich NiTi shape memory alloy （SMA） fabricated by self-propagating high-temperature synthesis （SHS） were investigated. The solution treatment at 1050℃ has little effects on stable Ti2Ni second phase, however, it decreases the amount of Ni4Zi3 phase derived from the SHS process and results in the improvement of the ductility of porous NiTi SMA. The subsequent aging treatment after solution treatment could lead to the precipitation of the discrete Ni4Ti3 phase in NiTi matrix grains, which increases the brittleness of porous NiTi SMA. Porous NiTi SMA presents a composite fracture behavior consisting of a ductile fracture of NiTi matrix and a cleavage fracture of second phase particles. Many cracks existing on the interfaces indicate that the bonding of the matrix with second phase particles is weak.
出处
《中国有色金属学会会刊：英文版》
CSCD
2006年第1期49-53,共5页
Transactions of Nonferrous Metals Society of China
基金
Project(CityU 1/04C) supported by Hong Kong Grants Council Central Allocation Group Research Project
Project(50501007) supported by the National Natural Science Foundation of China
Project(BK2003062) supported by the Natural Science Foundation of Jiangsu Province, China
Project(4012001007) supported by the Teaching and Research Award Program for Outstanding Young Teachers of Southeast University
Project(9212001352) the Pre-research Project for National Natural Science Foundation in Southeast University
关键词
NITI
高温燃烧合成
形状记忆合金
热处理
压缩性能
显微结构
NiTi shape memory alloy
porous material
self-propagating high-temperature synthesis
microstructure
compressive properties
