采用力学性能测试、X射线衍射、显微组织观察等方法,研究了稀土元素铒对铝-铜-镁-银合金组织与力学性能的影响.结果表明:添加0.2%Er(质量分数)有助于降低铸态合金的晶粒尺寸,提高铸态合金的室温与高温力学性能;然而,铒降低了挤压态合金的时效硬化与185℃峰时效处理后的拉伸性能,这是由于铒与合金中的铝、铜形成了Al8Cu4Er稀土化合物相,减少了用于固溶时效的铜元素,最终使强化析出相--Ω相的体积分数减少.
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