Evolution of atomic distribution during devitrification of a zirconium-based bulk metallic glass, Zr41.2Ti13.8Cu12.5Ni10.0Be22.5, was investigated using three-dimensional atom probe microscopy. Atom probe analysis showed uniform distribution of constituent elements for the as-cast alloy, with no phase separation. The metallic glass was annealed at different temperatures to study the crystallization pathways and the length scale, distribution, and morphology of the phases formed. Devitrification was found to proceed via the formation of a metastable icosahedral phase. The devitrification pathway is explained based on "strong-liquid" behavior of this alloy. © 2015 Elsevier B.V. All rights reserved.

Harpreet Singh

Mechanical Engineering

(SoE) School of Engineering

Mridha S.

Jaeger D.L.

Banerjee R.

Mukherjee S.

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Shiv Nadar University

Materials Letters

Amorphous metallic alloys are widely used in bulk form and as coatings for their desirable corrosion and wear behavior. Nevertheless, the effects of heat treatment and thermal cycling on these surface properties are not well understood. In this study, the corrosion and wear behavior of two Zr-based bulk metallic glasses were evaluated in as-cast and thermally relaxed states. Significant improvement in wear rate, friction coefficient, and corrosion penetration rate was seen for both alloys after thermal relaxation. A fully amorphous structure was retained with thermal relaxation below the glass transition. There was an increase in surface hardness and elastic modulus for both alloys after relaxation. The improvement in surface properties was explained based on annihilation of free volume. © 2017, The Minerals, Metals & Materials Society.

Amorphous Metallic Alloys: Pathways for Enhanced Wear and Corrosion Resistance

Progress in Materials Science

Phase separation in metallic glasses

Physical Review Letters

Atomic-Scale Structural Evolution and Stability of Supercooled Liquid of a Zr-Based Bulk Metallic Glass

Acta Materialia

Nanocrystallization of Zr41.2Ti13.8Cu12.5Ni10.0Be22.5 metallic glass

Viscosity and specific volume of bulk metallic glass-forming alloys and their correlation with glass forming ability

Journal of Non-Crystalline Solids

Phase separation and crystallization in the Zr41.2–Ti13.8–Cu12.5–Ni10–Be22.5 bulk metallic glass determined by physical measurements and electron microscopy

Evolution of atomic distribution during devitrification of bulk metallic glass investigated by atom probe microscopy