Influence of grain size on Portevin-LeChatelier effect in Al-Mg alloys
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概要
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In order to investigate the effect of grain size on Portevin-Le Chatelier yielding, tensile tests were performed on Al-0.55 and 1 at%Mg alloys having various grain sizes.In the temperature range of -20+40°C and strain rate range of 3.3×10-51.7×10-3/sec., the value of activation energy for P-L effect was found to be 0.60±0.02eV, which was independent of grain size.The relation between strain rate (ε) and strain (ε0) required for the onset of P-L effect at 0°C was expressed as follows:ε∝ε02.01±0.1μ-0.53±0.02where μ is grain size.It was found that the value of ε0 was decreased and the stress at the onset of P-L effect was increased with the decrease of grain size. The above fact is explained by the effect of grain size on the average velocity of moving dislocations.
- 一般社団法人 軽金属学会の論文
一般社団法人 軽金属学会 | 論文
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