Interface strength in NiAl–Mo composites from 3-D X-ray microdiffraction
Research highlights
► Strain gradients in NiAl–Mo composite were probed with 3D X-ray microdiffraction. ► Residual strains relaxation results in the formation of a near-surface slip zone. ► An approach to calculate the fiber–matrix interface strength is suggested.
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Cited by (15)
Strength statistics of single crystals and metallic glasses under small stressed volumes
2016, Progress in Materials ScienceCitation Excerpt :For the 11% pre-strained samples, the scatter is significantly reduced and the measured strength approaches the bulk strength of about 1 GPa as given in Fig. 6(d). The defect structures before and after the tests have been confirmed by extensive synchrotron X-ray diffraction measurements (using the Advanced Photon Source, Argonne, IL by Barabash et al. [118–121] and Bei et al. [122]) and the Swiss Light Source by Zimmermann et al. [123–125], neutron diffraction characterization [126], and TEM investigations [44,45,127,128]. Results in Fig. 6 suggest that the pre-existing defects provide heterogeneous dislocation nucleation sources that lead to significant scatter of the strength measurements, so that seeking for the scaling relationship as in Fig. 1(a) is rather inappropriate.
Characterization of dislocation structures and deformation mechanisms in as-grown and deformed directionally solidified NiAl-Mo composites
2015, Acta MaterialiaCitation Excerpt :Since the coefficients of thermal expansion of the two phases in the NiAl–Mo composite are different [21], introducing a〈1 0 0〉 dislocations in the NiAl matrix during cooling would relieve the thermal contraction mismatch. The a〈1 0 0〉 dislocation arrangements observed in the as-grown eutectic can be explained from the residual stresses that arise from the thermal contraction mismatch in the Mo fiber and NiAl matrix [21–24]. The thermal expansion coefficient of Mo is less than that of NiAl, so upon cooling from the eutectic temperature, the Mo phase will be subjected to compression and NiAl to tension in the fiber growth direction (illustrated in Fig. 13 (a)).
Phase-specific elastic/plastic interface interactions in layered NiAl-Cr(Mo) structures
2012, Acta MaterialiaCitation Excerpt :The small X-ray beam size (<0.5 μm) allowed non-destructive measurements of lattice rotations and strains in the individual phase-specific mesoscale lamellae at different depths. Details describing applications of the DAXM technique can be found in Refs. [19–27]. The full width at half maximum (FWHM) for the Cr Q336-distribution is almost twice as large as the FWHM for NiAl (Fig. 2b).
Submicrometre-resolution polychromatic three-dimensional X-ray microscopy
2013, Journal of Applied Crystallography