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Toughening and strengthening by off-stoichiometric TiC in equilibrium with Mo solid solution
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Journal Article
Toughening and strengthening by off-stoichiometric TiC in equilibrium with Mo solid solution
2025
Overview
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/(Ti
0.96
,Mo
0.04
)C
0.67
two-phase alloys was investigated. The load–displacement curves of the Mo/(Ti
0.96
,Mo
0.04
)C
0.67
two-phase alloys, as measured by four-point bending tests, were similar regardless of the (Ti
0.96
,Mo
0.04
)C
0.67
volume fraction
,
whereas the peak stress and fracture toughness increased with increasing volume fraction. These results suggest that (Ti
0.96
,Mo
0.04
)C
0.67
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 (Ti
0.96
,Mo
0.04
)C
0.67
grains, and the improvement in the deformability of (Ti,Mo)C
x
itself owing to its off-stoichiometry.
Publisher
Nature Publishing Group UK,Nature Portfolio
