综述了Fe、Si杂质元素对7×××系高强航空铝合金的微观组织及力学性能的影响.Fe、Si主要是以粗大难溶杂质相形式存在.形成含Fe杂质相的种类较多,在含Cu量较高的合金中主要是形成Al7Cu2Fe相;形成含Si杂质相主要是Mg2 Si相.Fe、Si杂质元素含量增加对合金强度的影响不大,但形成的富Fe、富Si粗大难溶杂质相含量的增加明显降低合金的塑性、断裂韧性和抗应力腐蚀性能.降低Fe、Si杂质元素含量是发展高综合性能航空铝合金的重要方向.
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