Abstract
Titanium diboride powder, produced in an arc‐plasma reactor, was pressureless‐sintered to near theoretical density to produce materials of different grain sizes. Mechanical properties in an aluminum environment at 960° to 1000°C were studied by strength vs stressing rate and KIc tests. All materials experienced liquid‐metal embrittlement in aluminum containing Fe, Si, and P impurities. During exposure, these metals penetrate TiB2 grain boundaries and the impurities preferentially segregate there. Fine‐ and coarse‐grained materials exhibited stress‐strengthening (negative N) and stress‐corrosion (positive N) slow crack growth behavior, respectively. Results were interpreted in terms of opposing slow crack growth mechanisms.
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