Abstract
The influence of homogenization annealing (HA) of magnesium alloy AZ91 on mechanical properties and corrosion behavior has been examined. The microstructure of the alloy was investigated by scanning electron microscopy (SEM) after metallographic preparation. The dependence of the mechanical properties, including Vickers hardness, yield strength, ultimate tensile strength, and elongation to failure on HA time at 380°C and 410°C were examined. It was observed that for each temperature, the hardness increased with increasing time up to a maximum and then slightly decreased for longer times. The ultimate tensile strength also exhibited the similar trend. The mechanical properties of AZ91 were significantly improved by HA. When the alloy samples are immersed in 1 N NaCl solution, it has been observed that intensive hydrogen evolution preferentially takes place at certain sites and the corrosion gradually advances.
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