The cohesion of previously fractured Fcc metals in ultrahigh vacuum
The cohesion of previously fractured Fcc metals in ultrahigh vacuum
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超高真空中先前断裂的 Fcc 金属的内聚力
DOI：
10.1007/bf03038415
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发表时间：
1970
期刊：
影响因子：
--
通讯作者：
L. Rice
中科院分区：
文献类型：
--
作者：
H. Conrad;L. Rice
使用预先在超高真空中断裂的冷焊样品技术研究了面心立方金属银、铝、铜和镍的清洁表面的内聚力。焊缝的内聚强度随着压缩载荷的增加而增加，当内聚强度和压缩载荷通过每种金属的初始断裂强度标准化时，所有数据都落在具有轻微正曲率的单一曲线上。内聚系数范围为 0.62 至 1.15，与使用更精细的表面处理和测试技术获得的结果一致。有人提出，所有非合金面心立方金属所获得的基本恒定的内聚系数取决于以下事实：给定压缩载荷产生的接触面积与金属的断裂应力成反比，而内聚强度与该断裂应力成正比。对于在冷焊过程中或由于随后的热处理而在界面附近再结晶的铜样品，观察到内聚系数降低。
The cohesion of clean surfaces of the fcc metals Ag, Al, Cu, and Ni was investigated using the technique of cold welding specimens previously fractured in an ultrahigh vacuum. The cohesive strength of the weld increased with compressive load, all data falling on a single curve with slight positive curvature when the cohesive strength and compression load were normalized through the initial fracture strength of each metal. The cohesion coefficients ranged from 0.62 to 1.15 and were in accord with those obtained using more elaborate techniques of surface preparation and testing. It is proposed that the essentially constant cohesion coefficient obtained for all the unalloyed fcc metals resides in the fact that the area of contact produced by a given compressive load is inversely proportional to the fracture stress of the metal and the cohesive strength is directly proportional to this fracture stress. A lowered cohesion coefficient was observed for copper specimens which had recrystallized in the vicinity of the interface either during the cold welding or as the result of a subsequent heat treatment.