The current trend in micro-manufacturing industry is towards manufacturing of miniaturized light weight metallic components. These lightweight metallic micro components have a market in various sectors such as bio-medical, aerospace, micro-electromechanical systems (MEMS) etc. Magnesium alloys (Mg alloys) being bio-compatible and are one of the lightest metallic materials fitting the applicability aspects. But, due to their HCP crystal structure Mg alloys are difficult to deform materials and show reduced room temperature ductility and formability. Additionally, in the micro-scale level "size effects" offers further difficulties such as poor mechanical property, material anisotropy, reduced repeatability, increase in friction etc., A possible approach to overcome both the issues is by grain refinement to ultrafine (UFG) regime using SPD techniques. Therefore, in the first part of the present work we have used friction stir processing (FSP) technique and developed UFG Mg (QE22) alloy. In order to manufacture a micro-component using the developed UFG Mg (QE22) alloy the material must be subjected to a varying range of temperature and strain rate during any forming/secondary processing operation. Therefore, the second part of the present work focuses on establishing the optimized manufacturability domains (temperature and strain rate). The scientific knowledge was established to understand the underlying micro-mechanisms.