Annealing-induced devitrification behavior of a Ti47.4Zr5.3Ni5.3Cu42.0 glassy alloy

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  • Annealing-Induced Devitrification Behavior of a Ti<SUB>47.4</SUB>Zr<SUB>5.3</SUB>Ni<SUB>5.3</SUB>Cu<SUB>42.0</SUB> Glassy Alloy

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We have investigated devitrification behavior, accompanied by glass transition and precipitation of crystallites, as a function of annealing temperature and time for a Ti47.4Zr5.3Ni5.3Cu42.0 glassy alloy sheet, together with embrittlement behavior using bending fracture strain test. From kinetic analysis in one DSC profile under a constant heating rate, we can easily estimate the devitrification with temperature and time upon annealing. The glassy alloy became brittle during progressive devitrification in accordance with kinetic estimation. In sharp contrast with a Zr55Al10Ni5Cu30 glassy alloy, all the precipitations of crystallites (Cu4Ti3, Ti and CuTi) occur above glass transition temperature (Tg). We found that the Ti-based glassy alloy has large structurally and thermally stable area, which does not brittle up to 1.10×104 s at 650 K and 1.29×1010 s at 600 K, by experiment and kinetic estimation, respectively.

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