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研究了形变热处理(TMT:固溶-淬火-预析出-轧制)Al-7.81Zn-1.81Mg-1.62Cu合金板材中MgZn2等第二相粒子的析出形貌和数量及其对板材组织、织构和硬度的影响.结果表明,在TMT过程中形成的纳米/亚微米尺寸MgZn2粒子,在固溶处理过程中对亚晶界/晶界迁移形成了强烈的阻碍作用,但不会诱发粒子激发形核(PSN)再结晶.在本文实验条件下,合适的TMT制度可大幅降低材料的再结晶分数,载荷为29.4 kN的Vickers硬度由176 HV提高至203HV(提高了约15%).
The morphology and amount of precipitated second phase particles such as MgZn2 in Al-7.81Zn-1.81Mg-1.62Cu alloy sheet by TMT (solution heat-quenching-pre-precipitation-rolling) The results show that the nano / submicron size MgZn2 particles formed during TMT formed a strong impeding effect on the subgrain / grain boundary migration during the solution treatment, but did not induce particle excitation Nucleation (PSN) recrystallization In this experimental condition, a suitable TMT system can significantly reduce the recrystallization fraction of the material, and the Vickers hardness at 29.4 kN increases from 176 HV to 203 HV (about 15% increase).