Co对Al-5％Fe合金铸态组织的影响

研究了Co对Al-5％Fe(质量分数，下同)合金中Al3Fe相形貌的改善作用。合金中加入Co后可以在很大程度上改善Al3Fe相的形貌：未加Co的Al-5％Fe合金中的Al3Fe相大多为粗大的针状和片状；Co的加入量为O．2％时，Al3Fe相的形貌为小花朵状和细小条状；Co的加入量在0．2％～1．0％时，细化效果较好，但尤以0．2％为最好，Co的加入量超过1．0％后，Al3Fe相开始略微粗化。在对Co元素的面扫描时发现其大多固溶在Al3Fe相内。X衍射分析发现，Co的量为0．2％和1．0％时合金中只存在Al和Al3Fe相，并未发现其它相。

Effect of Co on As-cast Microstructure of Al-5%Fe Alloy

The improvement of Co on the morphology of Al_(3)Fe phase in Al-5%Fe (mass fraction,the same below) alloy was investigated. Adding Co obviously improves the morphology of Al_(3)Fe phase: the morphology of Al_(3)Fe phase is changed from coarse needle like and plate like in Al-5%Fe alloy without Co to small flower like and plate like in that with 0.2%Co; the refinement effects are good when the addition of Co is from 0.2% to 1.0%, especially 0.2%Co. The morphology of Al_(3)Fe phase is a little coarsened when adding more than 1.0%Co. It is found through element area scanning that Co nearly solutes in primary Al_(3)Fe phase. X-ray diffraction shows that there only exist Al phase and Al_(3)Fe phase in Al-5%Fe alloy with 0.2% and 1.0%Co.