Transactions of Nonferrous Metals Society of China
JOURNAL OF RAILWAY SCIENCE AND ENGINEERING
|Vol. 12 No. 2 April 2002|
deposition heat resistant
（Department of Materials Science and Engineering,
Central South University, Changsha 410083, China）
Abstract:Rapidly solidified Al-8.4Fe-1.3V-1.7Si heat resistant alloy was made by using multi-layer spray deposition technique. Its thermal stability of mechanical properties was investigated by the means of tensile and hardness tests, thermal stability of microstructure by transmission electron microscopy (TEM), X-ray dif fraction (XRD). The results show that after heat exposure (HE) at 753K for 500h the tensile strength and hardness of Al-Fe-V-Si alloy at 623K maintains the same values as those at room-temperature. HE dose not obviously affect the thermal stabilities of Al12(Fe,V)3Si phase but the lattice constant of Al12(Fe,V)3Si phase decrease.
Key words: heat resistant Al alloys; heat exposure; microstructure; metastable phase; mechanical property