Co对Al-5%Fe合金铸态组织的影响

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

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0.2%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。

The improvement of Co on the morphology of Al3Fe phase in Al-5%Fe (mass fraction, the same below) alloy was investigated. Adding Co obviously improves the morphology of Al3Fe phase: the morphology of Al3Fe 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 Al3Fe 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 Al3Fe phase. X-ray diffraction shows that there only exist Al phase and Al3Fe phase in Al-5%Fe alloy with 0.2% and 1.0%Co.