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Development of a laboratory-based transmission diffraction technique for in situ deformation studies of Mg alloys

Kada,SR, Lynch,PA and Barnett,MR 2015, Development of a laboratory-based transmission diffraction technique for in situ deformation studies of Mg alloys, Journal of Applied Crystallography, vol. 48, pp. 365-376, doi: 10.1107/S1600576715001879.

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Title Development of a laboratory-based transmission diffraction technique for in situ deformation studies of Mg alloys
Author(s) Kada,SR
Lynch,PA
Barnett,MRORCID iD for Barnett,MR orcid.org/0000-0001-8287-9044
Journal name Journal of Applied Crystallography
Volume number 48
Start page 365
End page 376
Publisher International Union of Crystallography
Publication date 2015-04
ISSN 0021-8898
1600-5767
Keyword(s) laboratory setups
magnesium alloys
transmission X-ray diffraction
Science & Technology
Physical Sciences
Crystallography
X-RAY-DIFFRACTION
NEUTRON-DIFFRACTION
MAGNESIUM ALLOY
ELASTIC-CONSTANTS
ORIENTATION
BEHAVIOR
STRAIN
FILMS
COMPOSITES
MECHANISMS
Summary A laboratory-based transmission X-ray diffraction technique was developed to measure elastic lattice strains parallel to the loading direction during in situ tensile deformation. High-quality transmission X-ray diffraction data were acquired in a time frame suitable for in situ loading experiments by application of a polycapillary X-ray optic with a conventional laboratory Cu X-ray source. Based on the measurement of two standard reference materials [lanthanum hexaboride (NIST SRM 660b) and silicon (NIST SRM 640c)], precise instrumental alignment and calibration of the transmission diffraction geometry were realized. These results were also confirmed by the equivalent data acquired using the standard Bragg-Brentano measurement geometry. An empirical Caglioti function was employed to describe the instrumental broadening, while an axis of rotation correction was used to measure and correct the specimen displacement from the centre of the goniometer axis. For precise Bragg peak position and hkil intensity information, a line profile fitting methodology was implemented, with Pawley refinement used to measure the sample reference lattice spacings (d o (hkil)). It is shown that the relatively large X-ray probe size available (7 × 714mm) provides a relatively straightforward approach for improving the grain statistics for the study of metal alloys, where grain sizes in excess of 114μm can become problematic for synchrotron-based measurements. This new laboratory-based capability was applied to study the lattice strain evolution during the elastic-plastic transition in extruded and rolled magnesium alloys. A strain resolution of 2 × 10-4 at relatively low 2θ angles (20-65° 2θ) was achieved for the in situ tensile deformation studies. In situ measurement of the elastic lattice strain accommodation with applied stress in the magnesium alloys indicated the activation of dislocation slip and twin deformation mechanisms. Furthermore, measurement of the relative change in the intensity of 0002 and 10 3 was used to quantify {10 2} 011 tensile twin onset and growth with applied load.
Language eng
DOI 10.1107/S1600576715001879
Field of Research 091207 Metals and Alloy Materials
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2015, International Union of Crystallography
Free to Read? Yes
Persistent URL http://hdl.handle.net/10536/DRO/DU:30074080

Document type: Journal Article
Collections: Institute for Frontier Materials
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Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.