(中南大学 材料科学与工程系， 长沙 410083)
摘 要: 采用快速冷凝粉末包套挤压工艺制备了含铁量分别为1.2%和3.5%的Al-11%Si-Fe合金。研究了这两合金在挤压和退火状态下的微观组织特征和内耗行为，解释了Fe含量及其析出相、热处理状态等对内耗的影响，提出了该合金系在60～250℃温度范围产生内耗峰的机制。
关键字: 快速凝固； 微观组织； 内耗； 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
