Anisotropy of Thermal Expansion in an AZ31 Magnesium Alloy Subjected to the Accumulative Roll Bonding
Abstract
Accumulative roll bonding (ARB) is one of method for the production of metal materials with ultrafine grain microstructure. Sheets of the AZ31 magnesium alloy subjected to the 1 and 2 ARB passes through the rolling mill were cut so that the sample axis was either parallel or perpendicular to the rolling direction.
The linear thermal expansion of samples was measured using a Linseis L75PT-1600 dilatometer in the temperature range from room temperature up to 400 °C. The thermal expansion curves of the sheets were measured during two consequent heating and cooling cycles.
The temperature dependencies of the relative elongation and of the thermal expansion coefficient were estimated from the dilatometer measurements. Planar anisotropy of the thermal expansion was found.