Elastic softening behavior of Ti-Nb single crystal near martensitic transformation temperature

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The elastic behavior of Ti-40 wt % Nb single crystal near martensite start (Ms) temperature was studied using a resonant ultrasound spectroscopy measurements and the first principle calculation. The experimental results showed that both c' and c(s) shear moduli tended to soften as the temperature decreased from room temperature down to and across the Ms temperature of 267 K, suggesting that both the {112}< 111 > and {110}< 110 > shears were operating during martensitic transformations of disordered bcc to orthorhombic structure. The consideration of detailed atomic mechanisms involved in the shear sequences and the calculation of the energy of intermediate state suggested that the {110}< 110 > shear was operating as primary shear and the {112}< 111 > shear operating as a secondary shear to complete the transformation. The measurement further showed that the anisotropy constant, A, was rather increasing at the transition temperature approaching Ms, similarly to the transformation of ordered bcc (B2) to orthorhombic (B19) martensite. (c) 2010 American Institute of Physics. [doi:10.1063/1.3486212]
Publisher
Amer Inst Physics
Issue Date
2010-09
Language
English
Article Type
Article
Keywords

SHAPE-MEMORY ALLOYS; TOTAL-ENERGY CALCULATIONS; WAVE BASIS-SET; BETA-PHASE; TRANSITION; CONSTANTS

Citation

JOURNAL OF APPLIED PHYSICS, v.108, no.6, pp.063515 - 063516

ISSN
0021-8979
DOI
10.1063/1.3486212
URI
http://hdl.handle.net/10203/101594
Appears in Collection
MS-Journal Papers(저널논문)
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