Deformation mechanisms in Ti-6Al-4V/TiC composites |
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Authors: | A J Wagoner Johnson K S Kumar C L Briant |
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Affiliation: | (1) Present address: Division of Engineering, Brown University, 02912 Providence, RI;(2) Department of Mechanical and Industrial Engineering, University of Illinois at Urbana-Champaign, 61801 Urbana, IL |
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Abstract: | The compressive behavior at room temperature of Ti-6Al-4V/TiC composites was examined at strain rates from 0.1 to 1000 s−1. As little as 1 vol pct TiC particulates provided greater than a 20 pct increase in strength over that of the monolithic
Ti-6Al-4V, while further additions of TiC did not provide proportional benefits. Microstructural examination before and after
compression testing was instrumental in understanding the relative importance of the primary strengthening mechanism in the
composites as compared to the monolithic material. A comparison of the various possible mechanisms clearly showed that the
dominant mechanism was due to carbon in solid solution. At low strain rates, the failure process consisted of a progression
of damage in the matrix and at particle-matrix boundaries, while at high strain rates, failure occurred along adiabatic shear
bands. The composites had a greater susceptibility to adiabatic shear-band formation than did the monolithic material. |
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