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Interdiffusion in Cu☒Ni powder compacts was studied by x‐ray diffraction line shape analysis. Analogues to concentration‐penetration plots are obtained. Results obtained at 750°, 850°, 950°, and 1050°C are compared with the conclusion that a single diffusion mechanism dominates in the...
The analysis of wear experiments suggests that most of the events which occur in rubbing are contacts between protuberances which are deformed elastically and which separate without damage; an asperity encounter with damage is a relatively rare event. Apparatus for the study of isolated single...
This paper is a review of some of the recent work which has been done in the Research Laboratory for the Physics and Chemistry of Solids, University of Cambridge. Three main topics are discussed: (a) The friction and wear of materials at very high rates of sliding. When a ball, spinning at high...
An approximate method of solving Fick's diffusion equation (or the heat conduction equation) with variable diffusion coefficients is discussed. Simple solutions may be obtained. In one example, the result appears to be in good agreement with the more elaborate numerical calculations by Crank.
The explicit temperature function τ which relates the Debye temperature to a change in temperature has been found to be 4.1 for annealed carbonyl iron from x‐ray diffraction integrated intensity measurements. The corresponding Debye temperature, corrected for temperature diffuse scattering,...
The electron spin resonance of one of the defects produced by fast neutron irradiation of crystalline quartz is analyzed. The g tensor and hyperfine tensors deduced from these results imply that the defect electron is in a nonbonding tetrahedral hybrid orbital on a silicon. It is suggested that...
The results of rolling friction studies of several thermoplastics provide additional evidence for the correlation of such friction with dynamic mechanical losses in polymeric materials. Among the polymers discussed are polymethyl methacrylate, polytetrafluoroethylene, polyethylene, nylon,...
A scheme is developed for treating very fast acceleration processes involving plasmoids. The plasmoid is assumed to move approximately as a rigid body during the acceleration. Two coupled nonlinear differential equations must be solved simultaneously. A power series development valid for short...
Through suitable etching techniques, triangular etch pits are developed on the surfaces of electroluminescent ZnS:Cu,Cl powder crystallites at densities in the range 10 6 −10 8 ∕cm 2 . These pits, seen by means of the electron microscope, are essentially absent in similarly etched...
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