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The deformation behavior of B1-type stoichiometric TiC and off-stoichiometric (Ti0.96, Mo0.04)C0.67 was investigated by micropillar compression test utilizing an in situ scanning electron microscope. The yield stress of (Ti0.96, Mo0.04)C0.67 was found to be sufficiently lower than that of the stoichiometric TiC. In addition, the {001}<11¯0>, {110}<11¯0>, and {111}<11¯0> slip systems were identified to be active during the plastic deformation of (Ti0.96, Mo0.04)C0.67. The critical resolved shear stresses of these slip systems decreased in the following order: {110}<11¯0> (5.6 GPa), {001}<11¯0> (5.0 GPa), and {111}<11¯0> (4.4 GPa). In contrast to the stoichiometric TiC, which underwent complete fracture at a relatively early stage of deformation, (Ti0.96, Mo0.04)C0.67 deformed under >10 % plastic strain without fracturing, with crack preferentially initiating along the {001} plane. The findings demonstrate that the off-stoichiometry of (Ti0.96, Mo0.04)C0.67 improves plastic deformability and has a suppressive effect on crack propagation. The enhanced deformability may be attributed to the significantly reduced shear modulus caused by off-stoichiometry. © 2025 The Authors

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• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

Keyword: nanoindentation

Date published: 2025-04-17

Publisher: Elsevier BV

Journal:

• Materialia (ISSN: 25891529) vol. 40 102412

Funding:

• Government of Japan Ministry of Education Culture Sports Science and Technology
• National Institute for Materials Science
• Light Metal Educational Foundation
• Japan Society for the Promotion of Science JP24K17526

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1016/j.mtla.2025.102412

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Updated at: 2025-12-12 08:30:15 +0900

Published on MDR: 2025-12-12 08:24:08 +0900