Toughening and strengthening by off-stoichiometric TiC in equilibrium with Mo solid solution

Abstract B1-type TiC compounds in equilibrium with metal solid solution phases can possess off-stoichiometry allowing them to exhibit different mechanical properties compared to those containing stoichiometric TiC, which typically decreases the toughness of the material. In this study, the fracture...

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Bibliographic Details
Main Authors: Shuntaro Ida, Kotaro Yonemura, Xi Nan, Nobuaki Sekido, Kyosuke Yoshimi
Format: Article
Language:English
Published: Nature Portfolio 2025-07-01
Series:Scientific Reports
Online Access:https://doi.org/10.1038/s41598-025-05618-5
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Summary:Abstract B1-type TiC compounds in equilibrium with metal solid solution phases can possess off-stoichiometry allowing them to exhibit different mechanical properties compared to those containing stoichiometric TiC, which typically decreases the toughness of the material. In this study, the fracture behavior of Mo/(Ti0.96,Mo0.04)C0.67 two-phase alloys was investigated. The load–displacement curves of the Mo/(Ti0.96,Mo0.04)C0.67 two-phase alloys, as measured by four-point bending tests, were similar regardless of the (Ti0.96,Mo0.04)C0.67 volume fraction, whereas the peak stress and fracture toughness increased with increasing volume fraction. These results suggest that (Ti0.96,Mo0.04)C0.67 acts as both a strengthening and toughening phase. Two factors are considered to contribute to its function as a toughening phase: the presence of the Mo phase within the (Ti0.96,Mo0.04)C0.67 grains, and the improvement in the deformability of (Ti,Mo)C x itself owing to its off-stoichiometry.
ISSN:2045-2322