Abstract
Hardness measurement was carried out on powder particles of AlMnCr alloys (Al-5Mn-2.5Cr, Al-5Mn-4Cr-4Cr and Al-5Mn-6Cr), which were produced by ultrasonic helium gas atomization. It has been demonstrated that it is feasible to use conventional Vickers hardness measurement to characterize individual AlMnCr powder particles as small as 10 μm in size by an applied load of 5 g. It has been shown that the hardness is a function of alloy composition, size of powder particles and heat treatment. The hardness increased with the contents of alloying elements, i.e. manganese and chromium, and decreased when the size of powder increased. Decomposition of the supersaturation in the powders was accompanied by a drop in hardness after ageing of the rapidly solidified powders of the Al-5Mn-2.5Cr at 210 °C, 300 °C and 420 °. The results of hardness measurements are consistent with those from the investigations by X-ray diffraction, EDX and TEM.
Published Version
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