Sub-surface measurements of the austenite microstructure in response to martensitic phase transformation

0517462 - ÚT 2020 RIV GB eng J - Journal Article
Bucsek, A. - Seiner, Hanuš - Simons, H. - Yildirim, C. - Cook, P. - Chumlyakov, Y. - Detlefs, C. - Stebner, A.P.
Sub-surface measurements of the austenite microstructure in response to martensitic phase transformation.
Acta Materialia. Roč. 179, October (2019), s. 273-286. ISSN 1359-6454. E-ISSN 1873-2453
R&D Projects: GA ČR GA18-03834S
Institutional support: RVO:61388998
Keywords : shape memory alloy * martensitic phase transformation * in situ * synchrotron diffraction * X-ray diffraction
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 7.656, year: 2019
Method of publishing: Limited access
https://www.sciencedirect.com/science/article/abs/pii/S1359645419305488

We measure the microstructure response of the austenite phase during martensitic phase transformation tens of micrometers beneath the surface of a bulk single crystal nickel-titanium shape memory alloy. Using an emerging dark-field X-ray microscopy (DFXM) technique, the austenite phase fraction, relative misorientation, and elastic lattice plane strain are measured in the interior of the microstructure with a spatial resolution of 108 nm. The results show that some defects consistently induce forward transformation and delay reverse transformation, while other defects consistently impede the propagation of both forward and reverse transformation fronts.
Permanent Link: http://hdl.handle.net/11104/0304585