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Microstructural Developments Through Marforming in a Ni-Ti-Fe Shape Memory Alloy

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Title Microstructural Developments Through Marforming in a Ni-Ti-Fe Shape Memory Alloy
 
Creator BASU, R
JAIN, L
MAJI, BC
KRISHNAN, M
SAMAJDAR, I
 
Subject ROLLED THIN PLATES
DEFORMATION-BEHAVIOR
B19' MARTENSITE
TWINNED DOMAIN
MULTIPLE STEPS
TRANSFORMATION
TEXTURE
PHASE
EVOLUTION
FATIGUE
 
Description A hot-rolled Ni-Ti-Fe alloy was subjected to marforming: approximately 8 pct reduction (in thickness) in the martensite phase by laboratory rolling. Before the next marforming step, the sample was annealed to bring back calorimetric signatures of reversible austenite-martensite phase transformation. Significant differences in microstructure could be achieved by combinations of marforming and annealing. Such differences, on the other hand, originated from the marformed microstructure: two distinct regions of remarkably different substructures. The difference was mainly through the relative presence of defects: micro-twins and dislocations. The regions of lower defect densities got textured gradually, with marforming steps, to gamma (ND//aOE (c) 111 >) fiber. The regions with high defect densities, on the other hand, provided non-gamma fine clustered grains after annealing. Though debates may continue on the exact nature and origin of micro-twins, the present study brought out their dominant role in determining almost all aspects of microstructural developments.
 
Publisher SPRINGER
 
Date 2014-10-17T05:01:19Z
2014-10-17T05:01:19Z
2013
 
Type Article
 
Identifier METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 44A(9)4310-4322
http://dx.doi.org/10.1007/s11661-013-1780-1
http://dspace.library.iitb.ac.in/jspui/handle/100/16014
 
Language en