期刊
CERAMICS INTERNATIONAL
卷 46, 期 12, 页码 20488-20495出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2020.05.151
关键词
Residual stress; Stress relaxation; Thermal expansion mismatch; Phase transformation; Ceramic composite; Kink band
资金
- University of Sheffield Knowledge Exchange Scholarship 19/20 - EPSRC Impact Acceleration Account
- EPSRC [EP/R001766/1, EP/P006566/1] Funding Source: UKRI
This article presents a microstructural study on the role of incipient residual stress relaxation in TiC-particulate/SiC-matrix ceramic composite toughened by thermal expansion mismatch and phase transformation toughening. Exhaustive microstructural studies was undertaken using scanning electron microscopy and transmission electron microscopy following a wear test. It was found that the superposition of hydrostatic tensile stress induced at the surface following the sliding contact on the inherent residual stresses locked in the composite led to a relaxation and/or reduction in the residual stresses. Stress relaxation presented a wider implication for the tribological properties of this ceramic matrix composite (CMC) in the form of a grain-scale rippling microstructural phenomena.
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