Abstract
A study was made to explain the orientation dependency of the coefficient of friction, μ, of single crystals. The friction between two (100) surfaces of copper single crystals was measured in air, without lubricant and with molybdenum disulphide, a solid lubricant. In the high friction regime, it was found that μ was lower in the [011] direction than in the [001] direction, while in the low friction regime, μ was lower in the [001] direction than in the [011] direction. If it is assumed that friction is equal to the resistance for the deformation with crystallographic lattice slip and rotation of the subsurface, this anisotropy of the friction is explained. The value of friction is calculated and confirms experimental results.
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