高溫組織和力學性能
(湖南大學 材料科學與工程學院 ， 長沙 410082)
摘 要: 用噴射沉積-軋制工藝制備了FVS0812耐熱鋁合金薄板， 研究了該板材在高溫下的組織與性能。實驗表明， 板材具有優(yōu)異的高溫力學性能和熱穩(wěn)定性， 可歸因于基體上彌散分布的納米尺寸的Al12(Fe, V)3Si相。 FVS0812合金在200~300℃溫區(qū)內(nèi)延性降低， 是鐵原子擴散而造成的動態(tài)應變時效（DSA）的結(jié)果。 較高溫度下板材的拉伸斷口呈晶間斷裂，可能是由于DSA效應中鐵原子和Al12(Fe, V)3Si擴散到晶界而造成的晶界弱化的結(jié)果。
關鍵字: 噴射沉積； 耐熱鋁合金； 組織； 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
