Flexure strength of melt-infiltration-processed titanium carbide/nickel aluminide composites

Journal Article · Wed Jul 01 04:00:00 EDT 1998 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/j.1151-2916.1998.tb02555.x· OSTI ID:638369

Plucknett, K P; Becher, P F; Waters, S B ^[1]

---

1. Oak Ridge National Lab., TN (United States). Metals and Ceramics Div.

TiC/Ni{sub 3}Al composites were prepared using a simple melt-infiltration process, performed at either 1300 or 1400 C, with the Ni{sub 3}Al content varied over the range of 8--25 vol%. Densities >96% of theoretical were obtained for all composites. Four-point flexure strengths at 22 C increased as the Ni{sub 3}Al content increased (i.e., {approximately}1,100 MPa at 20 vol% Ni{sub 3}Al), with the highest strengths being observed for composites processed at 1300 C, because of reduced TiC grain size. Strengths at elevated temperatures increased with test temperature, up to {approximately}1,000 C. As with the yielding behavior of the Ni{sub 3}Al alloy used, a maximum in composite strength ({approximately}1,350 MPa) versus temperature was observed; this occurred at 950 C, which is {approximately}300 C above the yield maximum for the alloy. Extensive plastic strain was achieved in the composites even at high loading rates at 1,135 C, and the yield stress was dependent on the applied loading rate.

• Sponsoring Organization: USDOE
• OSTI ID: 638369
• Journal Information: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 7 Vol. 81; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
COMPOSITE MATERIALS
CONCENTRATION RATIO
FLEXURAL STRENGTH
INTERMETALLIC COMPOUNDS
NICKEL ALLOYS
PLASTICITY
TEMPERATURE DEPENDENCE
TITANIUM CARBIDES