分散硬化Al-Si合金の不均一降伏挙動と降伏強度
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概要
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A study on yield strength, especially on discontinuous yielding of dispersion hardened Al-Si single and polycrystals was carried out by tensile testing with the aid of acoustic emission signal analysis. 0.2% proof stress of the alloys is inversely proportional to the mean dispersed particle spacing, indicating that Orowan's dislocation bowing-out mechanism controls the yield strength. High acoustic emission activity, AE peak in yielding, is observed in the initial deformation region in dispersed alloys. Discontinuous yielding occurs in the region of high activity AE peaks. Emitted energy within an AE peak is inversely proportional to the square of mean particle spacing and corresponds to stored energy of bowing-dislocation between two isolated particles. Quantitative distribution of particle spacing in a specimen is evaluated by analyzing the AE peak in yielding using the relation above obtained between Orowan stress, particle size and acoustic emission activity.
- 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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