Morse势函数和钼单晶等的临界切应力的温度依赖性

综述了以往钼、铁、铝、镁等单晶临界切应力温度依赖性的实验；指出：在滑移系统不变的条件下，在一定的温度范围内，临界切应力和温度呈近似指数关系是相当普遍的规律。Ｍｏｒｓｅ势函数应用和实验的吻合说明原子间力对屈服应力的重要作用。结合近来发展讨论今后的发展，指出金属范性的本质深入到电子结构层次研究的重要意义。

MORSE FUNCTION AND TEMPERATURE DEPENDENCE OF CRITICAL RESOLVED SHEAR STRESS OF Mo AND OTHER SINGLE CRYSTALS

We review experimental results of the temperature dependence of critical resolved shear stresses (crss) of Mo, Fe, Al and Mg single crystals. Associating reports in recent years, we point out that the exponential relationship between crss and the absolute temperature in these single crystals is more common. Successful explanation with Morse function shows the importance of the role of interatomic force to yielding phenomenon. Ideas of interatomic force fields which can be used to study extended defects such as dislocations, grain boundaries, surfaces and cracks have been established in last 30 years. Applications of interatomic forces to calculate the structure and energy of dislocation core have now form the basis for our understanding of mechanical properties of materials. Positron annihilation technique has been used to study the atomic and electronic structure of defects experimently. The glorious future of this field is waited for us to creat in the coming years.