Effect of grain size on dynamic mechanical properties of pure aluminum
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摘要: 通过热处理方式制备了3种不同晶粒度的纯铝样品。利用分离式霍普金森压杆加载装置测量了3种纯铝在应变率102~104 s-1范围内的应力应变曲线。实验曲线表明,纯铝的屈服应力和流动应力随晶粒度的增大而减小;根据实验数据拟合了纯铝在动态下的Hall-Petch公式。同时采用一级轻气炮对3种纯铝进行了层裂实验,结果表明晶粒度对纯铝的层裂特性几乎没有影响。Abstract: Three pure aluminum specimens with different grain sizes were obtained by the controlled heat treatment process. The stress-strain curves of the three pure aluminum specimens at 102~104 s-1 were obtained by using the split Hopkinson pressure bar technique. The yield stress and flow stress increase with the decrease of the grain size. A Hall-Petch relationship of pure aluminum under dynamic loadings was fitted out. Spall tests were performed for the three specimens by utilizing a one-stage gas gun. The results show that the grain size can hardly influence the spall properties of pure aluminum.
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Key words:
- solid mechanics /
- dynamic mechanical properties /
- split Hopkinson pressure bar /
- pure aluminum /
- grain size /
- strain rate /
- spall
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