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60～25 0 ℃温度范围产生内耗峰的机制。
Al-11Si-1.2Fe and Al-11Si-3.5Fe alloys were experim entally made with rapid solidification-powder extrusion technology. The interna l friction and the microstructure of the alloys under extruted and isothermal ann ealing conditions were investigated. An internal friction peak was observed in the temperature range 60～250 ℃ in the present alloys. The Q -1 peak dec reases with the increase of iron， which was found to be directly attributed to t he precipitation of FeAl2 and Al-Si-Fe intermetallics from the aluminium all o y matrix. The internal friction mechanisms of the alloy were put forward.
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