晶粒度对纯铝动态力学性能的影响

Effect of grain size on dynamic mechanical properties of pure aluminum

1.
Institute of Optoelectronic Science and Technology, National University of Defense Technology, Changsha 410073, Hunan, China;
2.
Hypervelocity Aerodynamics Institute, China Aerodynamic Research and Development Center, Mianyang 622663, Sichuan, China

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。
- 固体力学 /
- 动态力学性能 /
- 分离式霍普金森压杆 /
- 纯铝 /
- 晶粒度 /
- 应变率 /
- 层裂
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 102~104 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.
- solid mechanics /
- dynamic mechanical properties /
- split Hopkinson pressure bar /
- pure aluminum /
- grain size /
- strain rate /
- spall