| Directional solidification experiments were conducted on the Al-Fe-Mn ternary eutectic alloys to investigate the growth mechanism and the mechanical behaviors at temperature gradient 80℃/㎝. The effects of the growth rate and the alloying elements, such as manganese and iron, on the composite structures and the mechanical properties of Al-Fe-Mn ternary composites were investigated. The results obtained were as follows: 1) As the growth rate increases, the growth morphology of the composites changes from the plate type into the rod one in Al-Fe alloys, but from the blade type into the square -pillar one in Al-Mn alloys. 2) In the case of Al-Fe alloys the interphase spacing increases with the increase of manganese content, but in the case of Al-Mn alloys it decreases with the increase of iron content. 3) The faster growth rate causes the higher mechanical strength. But the effect of the growth rate on the mechanical properties was larger for Al-Fe alloys than for Al-Mn alloys. |
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