Contact adhesion between solids in vacuum. II. Deformation and interfacial energy

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Abstract
For pt.I see ibid., vol.10, p.127 (1977). Values of the work of adhesion (change in surface energy) may be calculated from the results of single-asperity experiments on contact adhesion between metals in vacuum. The theory assumes that plastic deformation takes place at the instant of contact, even with zero applied load. The tensile surface force at the perimeter of the contact region induces a compressive force of reaction at the centre, which causes plastic flow. The predicted consequences of this 'adhesion-induced plastic deformation' are consistent with the two types of experimental curve of electrical resistance against negative and positive load. For platinum-tungsten interfaces contaminated with a residual layer of adsorbed gas, the radius of the contact region varied from 30 to 40 nm, and the work of adhesion varied from 0.3 to 1.3 J m-2 when separation took place at the interface.

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