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中文摘要：
为了研究轧制变形量与淬火敏感性的关系,测量了变形量为70%,80%和90%的7A55铝合金轧制板材在不同淬火条件下的拉伸力学性能。结果表明,热处理T6态下合金的强度、延伸率随着淬火速率的增加而提高;合金的淬火敏感性随着轧制变形量的增加而增大;固溶发生再结晶的过程中,与基体共格的Al3Zr粒子被大角度晶界扫过转变为非共格粒子;在缓慢淬火过程中,粗大平衡相η（MgZn2）以非共格的Al3Zr粒子作为形核位置析出,显著减弱时效强化效果,造成淬火敏感性现象;再结晶程度随着轧制变形而增大,是导致淬火敏感性提高的主要原因。
英文摘要：
The mechanical properties of aluminium alloy 7A55 plates with different rolling reductions（70%, 80% and 90%） were investigated to obtain the relations between rolling reduction and quench sensitivity. The results show that the strength and elongation of the plates with T6 temper increase with quenching rate; the quench sensitivity of aluminium alloy 7A55 increases with rolling reduction. The migration of high angle grain boundary results in the transformation of the coherent Al3Zr particles to the incoherent in recrystallization during solution treatment at 470 ℃. Furthermore, the incoherent Al3Zr particles serve as the nucleation sites of η（MgZn2） during slow quenching, which causes a marked loss of age-hardening and quench sensitivity of the alloy. Therefore, the volume of recrystallization which increases with rolling reduction is mainly responsible for the enhanced quench sensitivity.
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