(中南大學(xué) 材料科學(xué)與工程系， 長沙 410083)
摘 要: 采用快速冷凝粉末包套擠壓工藝制備了含鐵量分別為1.2%和3.5%的Al-11%Si-Fe合金。研究了這兩合金在擠壓和退火狀態(tài)下的微觀組織特征和內(nèi)耗行為，解釋了Fe含量及其析出相、熱處理狀態(tài)等對內(nèi)耗的影響，提出了該合金系在60～250℃溫度范圍產(chǎn)生內(nèi)耗峰的機(jī)制。
關(guān)鍵字: 快速凝固； 微觀組織； 內(nèi)耗； Al-Si-Fe合金
internal friction of Al-Fe-Si alloy
（Department of Materials Science and Engineering， Central South University，
Changsha 410083, P.R.China）
Abstract:Al-11Si-1.2Fe and Al-11Si-3.5Fe alloys were experimentally made with rapid solidificationpowder extrusion technology. The internal friction and the microstructure of the alloys under extruted and isothermal annealing conditions were investigated. An internal friction peak was observed in the temperature range 60～250 ℃ in the present alloys. The Q-1 peak decreases with the increase of iron， which was found to be directly attributed to the precipitation of FeAl2 and Al-Si-Fe intermetallics from the aluminium alloy matrix. The internal friction mechanisms of the alloy were put forward.
Key words: rapid solidification； microstructure； internal friction； Al-Si-Fe alloy
