Abstract:
The Mg & its Alloys are considered to be ‘the green engineering materials of the 21st
Century. Mg Alloys are light weight , ease of casting and has superior machinability. It
has low density, favorable thermal conductivity , specific Strength and Stiffness .AZ80
Mg alloy rectangular Block made by Casting and the effects of various Cryogenic
Treatment Such as Rapid Cooling and Rapid Heating etc. on Microstructure and
Mechanical Properties has Investigated .Mechanical properties Such as Tensile Strength
and Hardness has been Studied. It Shows higher Values of Tensile Strength and Hardness
during Rapid Cooling and Rapid heating [RCRH] Cryogenic Treatment Process.
Cryotreated AZ80 Mg alloy Shows 8% increase in tensile Strength compared to
Untreated condition. Rapid Cooling and Rapid heat Treatment of Mg Alloy was done by
heating to 200ºC and then cooling to room temperature and kept for 24 hours for aging
and then cool to Liquid Nitrogen Temperature. RCRH Cryogenic Treatment Process
Shows 30% increase in tensile Strength Compared to Untreated Condition. The
Improvement of the mechanical properties of Mg Alloy with Cryogenic Treatment is
attributed to the Synergistic effects of the refine grains, twins precipitates and non- basal
slip.
