Effect of heat treatment on microstructure and corrosion behavior of Az91d magnesium alloy
Chye, Lih T.
Mohd. Zamzuri, Mohammad Zain
Siti Norbahiyah, Mohamad Badari
Khairul Azwan, Ismail, Dr.
Mohd Nazree, Derman, Dr.
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An AZ91D ingot in the as-cast condition was homogenized by heat treatment process. Then, the microstructures produced and corrosion behaviour after heat treatment was studied in detail. As-cast AZ91D was recrystallize by solution treatment at 415°C and then aged at 175°C for various period of time. The corrosion resistance of all the different microstructures was studied in NaCl solution through weight loss measurement in immersion testing. The β phase was found to have a significant influence on the corrosion behaviour. In solution treatment, β phase dissolution decreased the cathode area leading to accelerated corrosion rate. After aging treatment, fine β phase precipitates between grain and microstructure recrystallize causing an increase in the corrosion resistances.