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首页> 美国卫生研究院文献>Materials >Study of the Portevin-Le Chatelier (PLC) Characteristics of a 5083 Aluminum Alloy Sheet in Two Heat Treatment States
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Study of the Portevin-Le Chatelier (PLC) Characteristics of a 5083 Aluminum Alloy Sheet in Two Heat Treatment States

机译：两种热处理状态下5083铝合金薄板的Portevin-Le Chatelier（PLC）特性研究

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摘要

In the present work, the role of Mg atoms in the form of either Mg clusters or β phase on the moving dislocations in 5083 aluminum alloy sheet were investigated by comparing the plastic flow behavior and Portevin-Le Chatelier (PLC) character in annealed and quenched conditions. It is found that the tensile strength of quenched sheets at different strain rates is slightly higher than those under annealed condition while the yield strength at both conditions is similar. In annealed sheets, the yield plateau was clearly observed at all tested strain rates with a strain less than 0.012, and its width increased with the increasing strain rate. However, no yield plateau was observed in quenched sheets. On the other hand, the characters of PLC are greatly varied with applied conditions and strain rate. Generally, annealed sheets have a higher waiting time, but lower critical strain/stress at lower strain rate (~1 × 10−4 s−1), but they are similar at a higher strain rate (1 × 10−2 s−1). However, the falling time at both annealed and quenched conditions are almost the same at tested strain rates.
机译：在本工作中，通过比较退火和淬火后的塑性流动行为和Portevin-Le Chatelier（PLC）特性，研究了以Mg团簇或β相形式存在的Mg原子在5083铝合金薄板运动位错中的作用。条件。发现在不同应变速率下的淬火板的拉伸强度略高于退火条件下的拉伸强度，而在两种条件下的屈服强度相似。在退火板中，在所有测试的应变率小于0.012的应变率下均清楚地观察到屈服平稳，并且其宽度随应变率的增加而增加。但是，在淬火板中未观察到屈服平稳。另一方面，PLC的特性会随应用条件和应变率而变化很大。通常，退火后的板具有更长的等待时间，但是在较低的应变速率（〜1×10 -4 s -1 ）下具有较低的临界应变/应力，但是它们是相似的在较高的应变速率下（1×10 -2 s -1 ）。但是，退火和淬火条件下的下降时间在测试的应变速率下几乎相同。

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