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暂不论金属中电阻的实质究竟是什么,目前它仍是揭露结构变化中常用而又较灵敏的一种方法;至于电阻与力学性质间的关系问题,Pry同Hennig及Berghout也曾先后作过初步讨论。我们这次借此两种方法(电阻的同力学的)平行的测量了99.98％多晶纯铜室温以上的热软化激活能,所用实验方法及结果如下: 将直径为0.47毫米上述铜丝截成长为80毫米的试样,经适当热处理后得到晶粒大小为0.06毫米的均匀细晶组织。为了以后形变同阻测量方便起见在试样两端都焊以小银珠,直径约2毫米。电阻测量即用一般电位计法,其精确度可达10~(-6)欧姆;所用小型拉伸机形变速度为10~(-1)毫米/秒,应力测量最大偏差约±0.14千克/毫米~2。所有预形
Regardless of the nature of the resistance in the metal, it is still a common and sensitive method of revealing structural changes. As for the relationship between resistance and mechanical properties, Pry, Hennig and Berghout have also made preliminary discuss. This time, we measured the thermal softening activation energy of 99.98% polycrystalline pure copper above room temperature in parallel by the two methods (same mechanical resistance). The experimental methods and results are as follows: cut the copper wire with a diameter of 0.47 mm A sample of 80 mm gave a uniform fine grain structure with a grain size of 0.06 mm after proper heat treatment. In order to facilitate the subsequent measurement of deformation resistance measurement welded to both ends of the sample are small silver beads, a diameter of about 2 mm. Resistance measurement using the general potentiometer method, the accuracy of up to 10 ~ (-6) ohms; small stretching machine used in the deformation speed of 10 -1 mm / s, the maximum stress measurement deviation of about ± 0.14 kg / mm ~ 2. All pre-shaped