Investigation of phase formation during cold rolling of elemental Zr-Al-Ni-Cu foils with bulk glass forming composition

Book · Thu Dec 31 04:00:00 EST 1998

OSTI ID:323496

Sagel, A ^[1]; Sieber, H; Perepezko, J H ^[2]; Fecht, H J ^[3]

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1. Technische Univ. Berlin (Germany). Inst. fuer Metallphysik und -Technologie
2. Univ. of Wisconsin, Madison, WI (United States). Dept. of Materials Science and Engineering
3. Univ. Ulm (Germany). Abteilung fuer Elektronische und Magnetische Materialien

Elemental Zr-Al-Ni-Cu foils of bulk glass forming composition were cold rolled at ambient temperature. The phase transformations during the cold deformation process were monitored with electron and X-ray diffraction and thermal analysis. After 120 deformation cycles a fully amorphous sample was obtained, as indicated by a distinct endothermic glass transition and a large exothermic crystallization reaction. The characteristics of the amorphous phase are compared with a liquid quenched metallic glass and mechanically alloyed elemental powder mixtures of similar composition. The amorphization reaction during cold rolling is similar to mechanical alloying and proceeds by the formation of a fine layered structure of the constitutents, a rapid reduction of the layer thickness and of the average grain size to a nanometer scale and dissolution reactions in the hcp Zr lattice. While in the beginning of the cold rolling process the elemental foils were ductile, after several rolling passes the multilayered sample became brittle and, finally, displayed large elastic flexure in the amorphous state. Several thermal treatments of the multilayered and amorphous samples were performed in order to study thermally activated solid-state amorphization reaction as well as phase formation during crystallization.

• Sponsoring Organization: Deutsche Agentur fuer Raumfahrtangelegenheiten (DARA) GmbH, Bonn (Germany); Alexander von Humboldt-Stiftung, Bonn (Germany); Office of Naval Research, Washington, DC (United States)
• OSTI ID: 323496
• Report Number(s): CONF-971201--
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
AMORPHOUS STATE
COPPER ALLOYS
EXPERIMENTAL DATA
FOILS
NICKEL ALLOYS
PHASE STUDIES
ROLLING
X-RAY DIFFRACTION
ZIRCONIUM ALLOYS