Revealing ultralarge and localized elastic lattice strains in Nb nanowires embedded in NiTi matrix

Ketao Zang; Shengcheng Mao; Jixiang Cai; Yinong Liu; Haixin Li; Shijie Hao; Daqiang Jiang; Lishan Cui

doi:10.1038/srep17530

Evaluating the Mechanical Behavior of 316 Stainless Steel at the Microscale Using Finite Element Modelling and In-Situ Neutron Scattering

ASME 2010 Pressure Vessels and Piping Conference: Volume 6, Parts A and B ◽

10.1115/pvp2010-25599 ◽

2010 ◽

Cited By ~ 3

Author(s):

Dong-Feng Li ◽

Noel P. O’Dowd ◽

Catrin M. Davies ◽

Shu-Yan Zhang

Keyword(s):

Finite Element ◽

Stainless Steel ◽

Finite Element Modelling ◽

Mechanical Response ◽

Fe Model ◽

Lattice Strains ◽

Crystallographic Slip ◽

In Situ Neutron Diffraction ◽

Elastic Lattice

In this study, the deformation behavior of an austenitic stainless steel is investigated at the microscale by means of in-situ neutron diffraction (ND) measurements in conjunction with finite-element (FE) simulations. Results are presented in terms of (elastic) lattice strains for selected grain (crystallite) families. The FE model is based on a crystallographic (slip system based) representation of the deformation at the microscale. The present study indicates that combined in-situ ND measurement and micromechanical modelling provides an enhanced understanding of the mechanical response at the microscale in engineering steels.

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Multifit/Polydefix: a framework for the analysis of polycrystal deformation using X-rays

Journal of Applied Crystallography ◽

10.1107/s1600576715010390 ◽

2015 ◽

Vol 48 (4) ◽

pp. 1307-1313 ◽

Cited By ~ 16

Author(s):

Sébastien Merkel ◽

Nadège Hilairet

Keyword(s):

Software Package ◽

Time Dependent ◽

X Rays ◽

Two Dimensional ◽

Differential Stress ◽

Lattice Strains ◽

Efficient Processing ◽

Elastic Lattice ◽

Synchrotron Beamlines ◽

Sample Pressure

Multifit/Polydefixis an open source IDL software package for the efficient processing of diffraction data obtained in deformation apparatuses at synchrotron beamlines.Multifitallows users to decompose two-dimensional diffraction images into azimuthal slices, fit peak positions, shapes and intensities, and propagate the results to other azimuths and images.Polydefixis for analysis of deformation experiments. Starting from output files created inMultifitor other packages, it will extract elastic lattice strains, evaluate sample pressure and differential stress, and prepare input files for further texture analysis. TheMultifit/Polydefixpackage is designed to make the tedious data analysis of synchrotron-based plasticity, rheology or other time-dependent experiments very straightforward and accessible to a wider community.

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Localization of Stresses in Polycrystalline Grains Measured by Neutron Diffraction and Predicted by Self-Consistent Model

Materials Science Forum ◽

10.4028/www.scientific.net/msf.681.103 ◽

2011 ◽

Vol 681 ◽

pp. 103-108

Author(s):

Anita Gaj ◽

Lea le Joncour ◽

Andrzej Baczmanski ◽

Sebastian Wroński ◽

Benoit Panicaud ◽

...

Keyword(s):

Neutron Diffraction ◽

Load Transfer ◽

Diffraction Method ◽

Lattice Strains ◽

Consistent Model ◽

Self Consistent ◽

Main Component ◽

Critical Resolved Shear Stress ◽

Elastic Lattice

Time of flight neutron diffraction method was applied to measure elastic lattice strains in austenitic steel during "in situ" tensile test. Comparing experimental data with self-consistent model, the critical resolved shear stress and hardening parameters were determined for polycrystalline grains. The result allowed us to determine the main component of the stress localization tensor, relating the rate of grain stress with the applied macrostress rate. The evolution of concentration tensor in function of the applied macrostress was analyzed. Finally, the load transfer between grains during yielding of the sample was studied.

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X-ray structure and elastic strains in copper

Proceedings of the Royal Society of London Series A - Mathematical and Physical Sciences ◽

10.1098/rspa.1940.0096 ◽

1940 ◽

Vol 176 (966) ◽

pp. 398-411 ◽

Cited By ~ 11

Keyword(s):

Applied Stress ◽

Cold Work ◽

X Ray Diffraction ◽

Atomic Lattice ◽

X Ray ◽

Permanent Strain ◽

Quantitative Measurements ◽

Lattice Strains ◽

Extension Curve ◽

Elastic Lattice

An X-ray examination of copper has been undertaken whilst the metal has been actually under tensile stress, and the X-ray structure investigated at a systematic series of points on the load-extension curve and during unloading and reloading from selected points on the curve. It is shown that the permanent strain is associated with the breakdown of the grains into the crystallite formation and that this change is essentially irreversible. The elastic strain of the metal is accompanied by reversible changes in dimensions of the atomic lattice which take place without leaving in the lattice any permanent distortion, as shown by the observation that the X-ray diffraction rings, including rings of the diffuse type, contract and expand under the action of the applied stress without any change in the degree of diffusion. The lattice changes are distinguished in this way from certain lattice strains or lattice distortions permanently imposed on the lattice as a result of deformation by cold-work. Quantitative measurements are made on the elastic lattice strains exhibited by the (400) and (331) planes in a direction perpendicular to the axis of the applied stress, and these are compared with the equivalent external elastic constants. These measurements show that marked difference in rate of strain may take place in neighbouring grains subjected to the same external stress, and on this difference is based an explanation of the extensive breakdown of the grains into components of widely varying orientations which characterizes the structure of a polycrystalline metal after deformation beyond the yield point.

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Synchrotron Radiation Application for Lattice Strain Measurements

Fatigue of Aircraft Structures ◽

10.1515/fas-2014-0003 ◽

2014 ◽

Vol 2014 (6) ◽

pp. 29-38

Author(s):

Elżbieta Gadalińska ◽

Andrzej Baczmański ◽

Kamil Sołoducha

Keyword(s):

Synchrotron Radiation ◽

Lattice Strain ◽

Polycrystalline Materials ◽

Lattice Strains ◽

Diffraction Peaks ◽

Non Destructive ◽

Initial Results ◽

Elastic Lattice

Abstract The methods most commonly used for the determination of the elastic lattice deformation and distortion are diffraction methods, which enable to perform measurements of stresses and elastic properties of polycrystalline materials. The main advantages of diffraction methods are associated with their non-destructive character and the possibility to be used for macrostress and microstress analysis of multiphase and anisotropic materials. Diffraction methods enable taking measurements selectively only for a chosen alloy phase. This is very convenient when several phases are present in the sample since measurements of separate diffraction peaks allow the behaviour of each phase to be investigated independently. In this work, a method for analysis of diffraction with synchrotron radiation is described. The methodology is based on the measurements of lattice strains during “in situ” tensile testing for several hkl reflections and for different orientations of the sample with respect to the scattering vector. Some initial results are presented.

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