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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/12821
Title: Evolution and stability of phases in a high temperature shape memory alloy Ni49.4Ti38.6Hf12
Authors: Suresh, K. S.
Kim D.-I.
Bhaumik S.K.
Suwas S.
Published in: Intermetallics
Abstract: Ni49.4Ti38.6Hf12 shape memory alloy has been characterized for structure, microstructure and transformation temperatures. The microstructure of the as-cast sample consists of B19′ and R-phases, and (Ti,Hf)2Ni precipitate phase along the grain boundaries in the form of dendrites. The microstructure of the solution treated sample contains only B19′ martensite phase, whereas a second heat treatment after solutionizing results in reappearance of the R-phase and the (Ti,Hf)2Ni grain boundary precipitate phase in the microstructure. A detailed microstructural examination shows the presence of precipitates having both coherent and incoherent interface with the matrix, the type of interface being dictated by the crystallographic orientation of the matrix phase. The present study shows that the (Ti,Hf)2Ni precipitates having coherent interface with the matrix, drive the formation of the R-phase in the microstructure. © 2013 Elsevier Ltd. All rights reserved.
Citation: Intermetallics (2014), 44(): 18-25
URI: https://doi.org/10.1016/j.intermet.2013.08.005
http://repository.iitr.ac.in/handle/123456789/12821
Issue Date: 2014
Keywords: A. Intermetallics, miscellaneous
B. Martensitic transformations
B. Shape-memory effects
D. Microstructure
D. Phase interfaces
F. Electron microscopy, scanning
ISSN: 9669795
Author Scopus IDs: 54882593400
55742954800
7004351295
7003627765
Author Affiliations: Suresh, K.S., Department of Materials Engineering, Indian Institute of Science, Bangalore 560 012, India
Kim, D.-I., High Temperature Energy Materials Research Center, Korea Institute of Science and Technology, Seoul 136-791, South Korea
Bhaumik, S.K., Materials Science Division, Council of Scientific and Industrial Research (CSIR), National Aerospace Laboratories, Bangalore 560 017, India
Suwas, S., Department of Materials Engineering, Indian Institute of Science, Bangalore 560 012, India
Funding Details: Use of Central facility for X-ray at IISc is acknowledged. KSS acknowledges the support that has been provided by Korea Institute of Science and Technology, Seoul (Grant No. 2E24022 ).
Corresponding Author: Suwas, S.; Department of Materials Engineering, Indian Institute of Science, Bangalore 560 012, India; email: satyamsuwas@materials.iisc.ernet.in
Appears in Collections:Journal Publications [MT]

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