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首页> 外文会议>International Conference on Processing amp; Manufacturing of Advanced Materials Pt.1; Jul 7-11, 2003; Leganes, Madrid, Spain >Quantitative Analysis of Structure-Strength Relation of Commercial Purity Aluminium Deformed by Accumulative Roll Bonding and Annealed at Low Temperature
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Quantitative Analysis of Structure-Strength Relation of Commercial Purity Aluminium Deformed by Accumulative Roll Bonding and Annealed at Low Temperature

机译：累积辊压变形并在低温下退火的商业纯铝的结构强度关系的定量分析

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摘要

Commercial purity aluminium was severely deformed by accumulative roll-bonding (ARB) to a von Mises strain of 4.8 and subsequently annealed at temperatures lower than 200℃. Microstructures were characterized by transmission electron microscopy and properties were determined by tensile testing. The as-deformed sample had an elongated ultrafine microstructure with lamellar boundaries having a mean spacing of 200nm. This microstructure coarsened gradually with increasing annealing temperature and period. Structural parameters such as spacing between the dislocation boundaries and the misorientation angle across these boundaries were accurately measured and analyzed. The analysis showed that a large fraction of low angle boundaries exists not only in the as-deformed but also in the annealed samples. Therefore, both dislocation strengthening and grain boundary strengthening are considered to contribute to the strength of the material. Individual contribution was calculated and their summation approximately agreed with the flow stress values determined experimentally.
机译：商业纯铝通过累积辊压结合（ARB）严重变形为von Mises应变4.8，随后在低于200℃的温度下退火。通过透射电子显微镜对微结构进行表征，并通过拉伸试验确定其性能。变形后的样品具有细长的超细微结构，具有层状边界，平均间距为200nm。随着退火温度和周期的增加，该组织逐渐粗化。精确测量和分析了结构参数，例如位错边界之间的间距和跨这些边界的错位角。分析表明，不仅在变形后的样品中，而且在退火后的样品中，都存在很大一部分低角度边界。因此，位错强化和晶界强化都被认为有助于材料的强度。计算个体贡献，其总和与实验确定的流应力值大致相符。

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