On the origin of the anelastic relaxation effect in Ni3Al
On the origin of the anelastic relaxation effect in Ni3Al
复制标题
Ni3Al迟弹性弛豫效应的起源
DOI：
10.1080/01418619908210341
复制
发表时间：
1999
影响因子：
1.6
通讯作者：
P. Gadaud
中科院分区：
文献类型：
--
作者：
H. Numakura;N. Kurita;M. Koiwa;P. Gadaud
Gadaud和Chakib（1993，Mater. Sci. Forum，119-121，397）.由Mourisco等人（1996，J. Phys.巴黎，IV，C8-235）发现的弛豫幅度对晶体取向的依赖性强烈地表明，该效应是由于应力引起的Ni原子的亚晶格位置上的点缺陷的重新分布。的动力学和热力学方面的松弛可以定量地解释在反位Al原子的重新取向。的点缺陷的性能相关的效果已经计算的布拉格-威廉姆斯型的热力学模型和原子计算机模拟。在实验中观察到的弛豫速率和幅度与从这些计算的结果估计的理论值是在合理的协议。
Abstract A mechanism is proposed for the anelastic relaxation effect observed at high temperatures for Ni3Al by Gadaud and Chakib (1993, Mater. Sci. Forum, 119—121, 397). The dependence of the relaxation magnitude on the crystal orientation as found by Mourisco et al. (1996, J. Phys. Paris, IV, C8—235) strongly suggests that the effect is due to stress-induced redistribution of point defects on the sublattice sites for Ni atoms. Both the kinetic and the thermodynamic aspects of the relaxation can be explained quantitatively in terms of reorientation of antisite Al atoms. The properties of the point defects relevant to the effect have been calculated by a thermodynamic model of the Bragg-Williams type and by atomistic computer simulation. The rate and the magnitude of the relaxation observed in experiment are in reasonable agreement with theoretical values estimated from the results of these calculations.