振动弯结与可动点缺陷的交互作用所引起的反常内耗的计算机模拟

对于溶质原子在弯结的膨胀场中的位能做了简化假定以后,用数值方法求解了溶质原子沿着一个弯结的位错管道扩散所遵守的一维普遍扩散方程,计算了溶质原子的瞬时浓度分布,振动弯结的能量耗损、平均阻尼系数和平均刚度的瞬时值。从过去和现在所得的数值计算结果归纳出有关弯结平均阻尼系数和平均刚度的简化近似公式,对反常内耗现象作了半定量解释。 关键词：

COMPUTER SIMULATIONS OF THE ANOMALOUS INTERNAL FRICTION ASSOCIATED WITH THE INTERACTION BETWEEN OSCILLATING KINKS AND MOBILE POINT DEFECTS

Based on a simplified potential of a solute atom in the dilatation field of a kink, the general one-dimensional diffusion equation of solute atoms along the pipe of a dislocation with a moving kink was solved numerically. The instantaneous distribution of the concentration of solute atoms, instantaneous values of the dissipation of energy, of the mean damping coefficient and of the mean rigidity of an oscillating kink were calculated.Simplified approximate formulae about the mean damping coefficient and the mean rigidity were deduced from the numerical results obtained previously and in this paper, in terms of which the anomalous internal friction phenomena were explained semi-quantitatively.