Model for grain boundary sliding and its relevance to optimal structural superplasticity
Model for grain boundary sliding and its relevance to optimal structural superplasticity
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晶界滑动模型及其与最佳结构超塑性的相关性
DOI：
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发表时间：
1996
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通讯作者：
J. Schlipf
中科院分区：
文献类型：
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作者：
T. A. Venkatesh;S. S. Bhattacharya;K. A. Padmanabhan;J. Schlipf
使用三个铝合金系统的实验数据验证了基于晶粒/相间边界滑动控制流动模型获得的最佳结构超塑性的结论。使用五个实验确定的、具有物理意义的常数可以非常准确地计算同结构应变率-应力关系（其中三个也可以根据理论计算；两个完全计算，一个部分计算）。计算了速率控制边界滑动过程的真实激活能、滑动引起的内应力分布的变化、与测量的等结构等温应变率成比例的应力函数以及表观粘度。这表明所研究的三种铝合金中微观边界滑动的基本单元具有共同的结构。 MST/3077
he conclusions reached based on a grain/interphase boundary sliding controlled flow model for optimal structural superplasticity are verified using experimental data from three aluminium alloy systems. Isostructural strain rate–stress relationships could be calculated very accurately using five experimentally determined, physically meaningful constants (three of which could also be calculated from theory; two fully and one partially). The true activation energy for the rate controlling boundary sliding process, the variations of the internal stress distribution arising from sliding, the stress function that is proportional to the measured isostructural isothermal strain rate, and the apparent viscosity, were calculated. It is suggested that the basic units of microscopic boundary sliding in the three aluminium alloys examined have a common structure. MST/3077