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研究了块体纳米晶Al-10Zn-2.8Mg-118Cu合金热处理前后的微区力学性能和变形机制,结果表明:块体纳米晶Al-10Zn-2.8Mg-1.8Cu合金经T6处理后杨氏模量没有明显的变化,硬度明显提高;在SPS试样中可观察到明显的室温蠕变和剪切带,随着应变速率的增加,室温蠕变越来越明显,但是剪切带越来越不明显;而在T6态试样中很难观察到室温蠕变和剪切带。T6处理改变了第二相粒子的形貌和分布,是产生这一现象的原因。
The mechanical properties and deformation mechanism of the bulk nanocrystalline Al-10Zn-2.8Mg-118Cu alloy before and after heat treatment were studied. The results show that the bulk nanocrystalline Al-10Zn-2.8Mg- There was no obvious change in the amount of the shear stress and the hardness increased obviously. At room temperature creep and shear bands were observed in the SPS samples. As the strain rate increased, creep at room temperature became more and more obvious. However, Not obvious; while it is difficult to observe room temperature creep and shear band in the T6 state sample. T6 treatment changed the morphology and distribution of second-phase particles, is the reason for this phenomenon.