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首页> 外文期刊>Materials Science and Engineering >Effect of cold rolling on the formation and distribution of nanoclusters during pre-aging in an Al-Mg-Si alloy
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Effect of cold rolling on the formation and distribution of nanoclusters during pre-aging in an Al-Mg-Si alloy

机译：冷轧对Al-Mg-Si合金预时效过程中纳米团簇形成和分布的影响

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摘要

The effect of high densities of dislocations on the formation behavior of two types of nano-scale clusters (nanoclusters), which are formed at room temperature or during pre-aging at ～373 K in an Al-Mg-Si alloy, was investigated by atom probe tomography. Cold rolling was applied to modify the formation behavior and/or the characteristics of the nanoclusters and also the precipitation sequence, which involve both nanoclusters and a strengthening phase to improve the bake-hardening response. Nanoclusters formed during pre-aging tended to form along the dislocations. Cold rolling accelerated the preferential formation of the nanoclusters, whereas the number density of the nanoclusters decreased by cold rolling before pre-aging. However, the number density of the nanoclusters was considerably higher than that of the β" phase. Cold rolling before pre-aging enhanced the age-hardenability the most compared with other processes such as the contemporary pre-aging process. It is considered that the nanoclusters along dislocations lead to the preferential transformation to the β" phase and then the rapid growth of the β" phase. The nanoclusters formed on dislocations are effective in improving the bake-hardening response for the duration of the bake-hardening process. The kinetics and the distribution of the nanoclusters were found to be affected by the dislocations which were induced by cold rolling.
机译：研究了高位错密度对两种类型的纳米簇（纳米簇）的形成行为的影响，所述簇在室温或在〜373 K时效时在Al-Mg-Si合金中形成。原子探针层析成像。应用冷轧来改变纳米团簇的形成行为和/或特性以及沉淀顺序，这涉及纳米团簇和强化相以改善烘烤硬化响应。在预时效过程中形成的纳米团簇倾向于沿着位错形成。冷轧促进了纳米团簇的优先形成，而纳米团簇的数量密度在预时效之前通过冷轧而降低。然而，纳米团簇的数量密度明显高于β“相。与时效工艺等其他工艺相比，在预时效之前进行冷轧可最大程度地提高时效淬透性。沿着位错的纳米团簇导致优先转变为β“相，然后迅速生长”β“相。位错上形成的纳米团簇可有效改善烘烤硬化过程中的烘烤硬化响应。动力学纳米团簇的分布受冷轧引起的位错的影响。

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