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Sub-Surface Measurements of the Austenite Microstructure in Response to Martensitic Phase Transformation

39 Pages Posted: 27 Apr 2019 First Look: Accepted

See all articles by Ashley Bucsek

Ashley Bucsek

Colorado School of Mines - Department of Mechanical Engineering

Hanu˘s Seiner

Economics Institute of the Academy of Sciences of the Czech Republic - Institute of Thermomechanics

Hugh Simons

Technical University of Denmark - Department of Physics

Phil Cook

European Synchrotron Radiation Facility

Can Yildirim

European Synchrotron Radiation Facility

Yuriy Chumlyakov

Tomsk State University - Department of Physics of Metals; Tomsk State University - Siberian Physical-Technical Institute

Carsten Detlefs

European Synchrotron Radiation Facility

Aaron P. Stebner

Colorado School of Mines - Department of Mechanical Engineering

Abstract

In this work, 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 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. We also show that the austenite undergoes an orientation splitting wherein the austenite near the transformation front is constrained from rotating and the austenite far from the transformation front is free to rotate in response to the heterogenous material deformation around it. Finally, we measure interfacial strain fields at the transformation front that extend tens of micrometers into the material. We use an analytical model to show how these strain fields can be explained by a lack of kinematic compatibility between the austenite and martensite phases at the austenite−martensite interface.

Keywords: shape memory alloy, martensitic phase transformation, in situ, synchrotron diffraction, X-ray diffraction

Suggested Citation

Bucsek, Ashley and Seiner, Hanu˘s and Simons, Hugh and Cook, Phil and Yildirim, Can and Chumlyakov, Yuriy and Detlefs, Carsten and Stebner, Aaron P., Sub-Surface Measurements of the Austenite Microstructure in Response to Martensitic Phase Transformation (April 26, 2019). Available at SSRN: https://ssrn.com/abstract=3378377

Ashley Bucsek (Contact Author)

Colorado School of Mines - Department of Mechanical Engineering ( email )

1500 Illinois St
Golden, CO 804101
United States

Hanu˘s Seiner

Economics Institute of the Academy of Sciences of the Czech Republic - Institute of Thermomechanics

Prague
Czech Republic

Hugh Simons

Technical University of Denmark - Department of Physics ( email )

Kongens Lyngby, 2800
Denmark

Phil Cook

European Synchrotron Radiation Facility

71 avenue des Martyrs
CS40220
Grenoble, 38043
France

Can Yildirim

European Synchrotron Radiation Facility

71 avenue des Martyrs
CS40220
Grenoble, 38043
France

Yuriy Chumlyakov

Tomsk State University - Department of Physics of Metals

Lenin Ave. 36
Tomsk, 634050
Russia

Tomsk State University - Siberian Physical-Technical Institute ( email )

Russia

Carsten Detlefs

European Synchrotron Radiation Facility

71 avenue des Martyrs
CS40220
Grenoble, 38043
France

Aaron P. Stebner

Colorado School of Mines - Department of Mechanical Engineering

1500 Illinois St
Golden, CO 804101
United States

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