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OALib Journal期刊
ISSN: 2333-9721
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固溶处理后冷轧变形7050铝合金时效工艺研究
DOI: DOI:10.3724/SP.J.1037.2009.00723, PP. 581-588
Keywords: 7050铝合金,冷轧,时效工艺,力学性能,显微组织
Abstract:
7050铝合金固溶处理后经67%冷变形,在120℃一级时效时,冷轧引入的大量位错增加了样品强度,时效4h样品的强度比T6状态样品提高12.6%.随时效时间增加,位错导致的不均匀形核的析出相粗化,样品的拉伸强度逐渐降低.但时效32h样品的强度仍高于T6状态样品.冷轧后时效样品的晶界析出相与T6状态相比分布较为分散,并且随时效时间的增加逐渐粗化.120℃时效4h的样品,经165℃二级时效处理,随时效时间的增加,样品中残留位错大量湮灭,晶内、晶界析出相尺寸均逐渐增大,导致样品的强度逐渐降低,而延伸率逐渐升高,165℃时效6h样品的强度与T76样品相似.在135-180℃二级时效1h的样品中的位错密度随温度的升高而减小,同时晶内、晶界析出相尺寸随温度的升高而增大,导致样品强度逐渐下降.
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