• Rey, P.
• Pena Uris, Gloria
• Miniño, P.
• Verdera, D.
• Gesto, D.

Abstract

riction Stir Processing (FSP) has gained important relevance in recent years as a very useful tool to produce ultra fine grain (UFG) microstructures (less than 500 nm) in cast and wrought magnesium and aluminum alloys, achieving super-plastic behavior. In this work, the influence of initial material condition and cooling rate on microstructure (in particular in the final grain size) and hardness of an AM60-6 mm thick magnesium alloy was analyzed. A MP159 fix pin tool for 3 mm butt joints was used. FSP tests were conducted on as-cast and solubilized plates. Particular attention was paid to the level of grain refinement when a cooper backing plate and a cooling agent are used. A sub-micron grain size was obtained when these vigorous cooling systems were employed. Introduction Superplastic materials could be deformed extensively without fracture, up to 8000% of its original form [1]. Because of their potential regarding economic and energy savings, the study and development of these materials is considered as strategic research in advanced countries. Superplasticity is a phenomenon considered "slow" because it occurs normally in the range of strain rates of 10

Topics

• impedance spectroscopy
• polymer
• grain
• grain size
• Magnesium
• magnesium alloy
• Magnesium
• aluminium
• laser emission spectroscopy
• hardness