通过显微硬度测试、拉伸测试、透射电镜及扫描电镜观察分析等手段研究了Mn含量对2519铝合金组织与力学性能的影响.研究结果表明,当Mn含量小于0.29wt%,合金的强度随Mn含量的增加逐渐增大;当Mn含量大于0.29wt%后,合金强度随Mn含量的增加却有所降低;随Mn含量的增加,合金170 ℃时效硬化速度逐渐加快,峰值时效时间提前,但合金的延伸率随Mn含量的增加而逐渐降低;当Mn含量大于0.29wt%,合金的时效硬化效果随Mn含量的增加而有所降低.综合考虑合金的强度和塑性,2519铝合金中的Mn含量以0.29wt%为宜.
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