高温组织和力学性能
(湖南大学 材料科学与工程学院 ， 长沙 410082)
摘 要: 用喷射沉积-轧制工艺制备了FVS0812耐热铝合金薄板， 研究了该板材在高温下的组织与性能。实验表明， 板材具有优异的高温力学性能和热稳定性， 可归因于基体上弥散分布的纳米尺寸的Al12(Fe, V)3Si相。 FVS0812合金在200~300℃温区内延性降低， 是铁原子扩散而造成的动态应变时效（DSA）的结果。 较高温度下板材的拉伸断口呈晶间断裂，可能是由于DSA效应中铁原子和Al12(Fe, V)3Si扩散到晶界而造成的晶界弱化的结果。
关键字: 喷射沉积； 耐热铝合金； 组织； 性能
heat-resistant FVS0812 aluminum alloy at high temperature
（ School of Materials Science and Engineering,
Hunan University, Changsha 410082, China）
Abstract: The FVS0812 heat-resistant aluminium alloy sheets were produced by spray-deposition and rolling process. The high temperature hardness, microstructure and mechanical properties were studied. The results reveal that the attractive elevated temperature mechanical properties of FVS0812 alloy are attributed to the ultrafine dispersed Al12(Fe, V)3Si. DSA was observed at a temperature ranged from 200℃ to 300℃ which was demonstrated via a drop in the tensile elongation. The fractographs of FVS0812 at elevated temperature are characterized by intergranular fracture possibly owing to the decrease of strength in grain boundary caused by DSA and the gathering of Al12(Fe, V)3Si.
Key words: spray deposition; heat-resistant aluminium alloy; microstructure; properties
