Journal article
In situ neutron diffraction evidence for fully reversible dislocation motion in highly textured polycrystalline Ti2AlC samples
Acta materialia, v 98(C), pp 51-63
01 Oct 2015
Abstract
[Display omitted]
Herein careful analysis of in situ neutron diffraction patterns obtained, while cyclically loading highly textured polycrystalline Ti2AlC, a MAX phase, samples, provides compelling experimental evidence – in the form of fully reversible peak lattice elastic strain loops and peak widening and narrowing upon load cycling – for the existence of fully reversible dislocation motion. A comparison of the measured and calculated dislocation densities clearly shows that dislocation pileups alone cannot account for the experimental observations. Another micromechanism needs to be invoked. Based on the propensity of the MAX phases to deform by kinking, the micromechanism proposed is either the nucleation and annihilation of incipient kink bands, IKB, and/or the bowing of dislocations in preexisting low angle kink boundaries, LAKB. This micromechanism plays a vital role during the initial deformation of layered and other plastically anisotropic solids such as hexagonal close-packed metals. Consequently, the ramifications of this work on geology, metallurgy and other fields will prove quite important.
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Details
- Title
- In situ neutron diffraction evidence for fully reversible dislocation motion in highly textured polycrystalline Ti2AlC samples
- Creators
- Mohamed Shamma - Drexel UniversityEl’ad N. Caspi - Drexel UniversityBabak Anasori - Drexel UniversityBjørn Clausen - Los Alamos National LaboratoryDonald W. Brown - Los Alamos National LaboratorySven C. Vogel - Los Alamos National LaboratoryVolker Presser - Drexel UniversityShahram Amini - Drexel UniversityOri Yeheskel - Drexel UniversityMichel W. Barsoum - Drexel UniversityElad N Caspi - Materials Science and Engineering
- Publication Details
- Acta materialia, v 98(C), pp 51-63
- Publisher
- Elsevier
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000361074000005
- Scopus ID
- 2-s2.0-84937577099
- Other Identifier
- 991019168632304721
InCites Highlights
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Materials Science, Multidisciplinary
- Metallurgy & Metallurgical Engineering