Abstract
Friction plays a significant role in metal working, affecting the flow stress, the deformability, the surface finish, the tool life, etc. Magnesium alloy ZM-21 in the wrought condition is used generally in aerospace components, the present study being undertaken to assess the suitability of lubricants for the working of this alloy. The paper describes ring compression tests performed on the as-cast material with nine different lubricants in the temperature range 300–500°C, friction factors and flow stresses being determined for the different conditions. The ‘experimentally’ determined values of friction factor μ, obtained using the experimental calibration results of Male and Cockroft have been found to be related to the ‘theoretical’ friction factor (m, obtained using the theoretical calibration results of De Pierre et al.) through a second-order polynomial. A significant observation was a sharp change in friction factor at about 400°C. EPMA and differential scanning calorimetry (DSC) study of the material indicate the presence of a metastable phase in the as-cast condition which became dissolved during homogenisation at around 350°C, the rise in friction factor being attributable to this feature.
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