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Title: Effect of microstructure anisotropy on the deformation of MAX polycrystals studied by in-situ compression combined with neutron diffraction

In situ compression tests combined with neutron diffraction were performed on Ti{sub 2}AlN MAX polycrystals with lamellar anisotropic microstructure: the diffraction peak evolution (position and profile) with applied stress reveals that lamellar grains parallel to compression axis remain elastic while lamellar grains perpendicular to compression plastify, both families being subjected to strong variations of heterogeneous strains (types II and III). We demonstrate that this behavior originates from the complex response of the very anisotropic lamellar microstructure and explains the observation of reversible hysteretic loops when cycling MAX polycrystals even in the elastic regime.
Authors:
; ;  [1] ; ; ;  [2]
  1. Institut Pprime, CNRS-University of Poitiers-ENSMA, SP2MI, 86962 Futuroscope (France)
  2. Materials Science and Simulations, NUM/ASQ, CH5232 Villigen PSI (Switzerland)
Publication Date:
OSTI Identifier:
22299888
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 24; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ALUMINIUM COMPOUNDS; ANISOTROPY; COMPRESSION; DEFORMATION; MICROSTRUCTURE; NEUTRON DIFFRACTION; NITROGEN COMPOUNDS; POLYCRYSTALS; STRAINS; STRESSES; TITANIUM COMPOUNDS