Microstructural Evolution in Ultrafine Grained FeMnSiCr Shape Memory Alloy Modules

Abstract:

High speed high pressure torsion (HSHPT) processing technology, engineered to achieving (ultra) fine bulk metallic structure under high pressure (~ GPa) and torsion by applying supplementary elevated rotation speed of superior anvil. Coned-disk spring shape modules were processed from an as cast Fe-28Mn-6Si-5Cr (mass %) shape memory alloy (SMA). Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) studies revealed that the structure of modules became submicron as an effect of HSHPT processing. After severe plastic deformation, a grain size gradient was obtained along the truncated cone generator, increasing from inner to outer areas, due to different deformation degrees in these zones. The mechanical and shape memory properties was performed in order to relate the structural changes caused by severe plastic deformation.

• Periodical: Advanced Materials Research (Volume 1143)
• Pages: 214-220
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1143.214
• Online since: February 2017
• Authors: Gheorghe Gurau, Carmela Gurau*, Mihaela Banu, Leandru Gheorghe Bujoreanu
• Keywords: High Pressure Torsion (HPT), Iron-Based SMA, Severe Plastic Deformation, Shape Memory Alloy, TEM

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