Three-dimensional in situ characterization of phase transformation induced austenite grain refinement in nickel-titanium

A. N. Bucsek; L. Casalena; D. C. Pagan; P. P. Paul; Y. Chumlyakov; M. J. Mills; A. P. Stebner

doi:10.1016/j.scriptamat.2018.11.043

Three-dimensional in situ characterization of phase transformation induced austenite grain refinement in nickel-titanium

A. N. Bucsek
, L. Casalena
, D. C. Pagan
, P. P. Paul
, Y. Chumlyakov
, M. J. Mills
, A. P. Stebner

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

32 Scopus citations

Abstract

Near-field and far-field high-energy diffraction microscopy and microcomputed tomography X-ray techniques were used to study a bulk single crystal nickel‑titanium shape memory alloy sample subjected to thermal cycling under a constant applied load. Three-dimensional in situ reconstructions of the austenite microstructure are presented, including the structure and distribution of emergent grain boundaries. After 1 cycle, the subgrain structure is significantly refined, and heterogeneous Σ3 and Σ9 grain boundaries emerge. The low volume and uneven dispersion of the emergent Σ boundaries across the volume show why previous transmission electron microscopy investigations of Σ grain boundary formation were inconsistent.

Original language	English (US)
Pages (from-to)	361-366
Number of pages	6
Journal	Scripta Materialia
Volume	162
DOIs	https://doi.org/10.1016/j.scriptamat.2018.11.043
State	Published - Mar 15 2019

All Science Journal Classification (ASJC) codes

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Metals and Alloys

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10.1016/j.scriptamat.2018.11.043

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title = "Three-dimensional in situ characterization of phase transformation induced austenite grain refinement in nickel-titanium",

abstract = "Near-field and far-field high-energy diffraction microscopy and microcomputed tomography X-ray techniques were used to study a bulk single crystal nickel‑titanium shape memory alloy sample subjected to thermal cycling under a constant applied load. Three-dimensional in situ reconstructions of the austenite microstructure are presented, including the structure and distribution of emergent grain boundaries. After 1 cycle, the subgrain structure is significantly refined, and heterogeneous Σ3 and Σ9 grain boundaries emerge. The low volume and uneven dispersion of the emergent Σ boundaries across the volume show why previous transmission electron microscopy investigations of Σ grain boundary formation were inconsistent.",

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doi = "10.1016/j.scriptamat.2018.11.043",

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T1 - Three-dimensional in situ characterization of phase transformation induced austenite grain refinement in nickel-titanium

AU - Bucsek, A. N.

AU - Casalena, L.

AU - Pagan, D. C.

AU - Paul, P. P.

AU - Chumlyakov, Y.

AU - Mills, M. J.

AU - Stebner, A. P.

PY - 2019/3/15

Y1 - 2019/3/15

N2 - Near-field and far-field high-energy diffraction microscopy and microcomputed tomography X-ray techniques were used to study a bulk single crystal nickel‑titanium shape memory alloy sample subjected to thermal cycling under a constant applied load. Three-dimensional in situ reconstructions of the austenite microstructure are presented, including the structure and distribution of emergent grain boundaries. After 1 cycle, the subgrain structure is significantly refined, and heterogeneous Σ3 and Σ9 grain boundaries emerge. The low volume and uneven dispersion of the emergent Σ boundaries across the volume show why previous transmission electron microscopy investigations of Σ grain boundary formation were inconsistent.

AB - Near-field and far-field high-energy diffraction microscopy and microcomputed tomography X-ray techniques were used to study a bulk single crystal nickel‑titanium shape memory alloy sample subjected to thermal cycling under a constant applied load. Three-dimensional in situ reconstructions of the austenite microstructure are presented, including the structure and distribution of emergent grain boundaries. After 1 cycle, the subgrain structure is significantly refined, and heterogeneous Σ3 and Σ9 grain boundaries emerge. The low volume and uneven dispersion of the emergent Σ boundaries across the volume show why previous transmission electron microscopy investigations of Σ grain boundary formation were inconsistent.

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DO - 10.1016/j.scriptamat.2018.11.043

M3 - Article

AN - SCOPUS:85057581325

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EP - 366

JO - Scripta Materialia

JF - Scripta Materialia

ER -

Three-dimensional in situ characterization of phase transformation induced austenite grain refinement in nickel-titanium

Abstract

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