Shaping of metallic glasses by stress-annealing without thermal embrittlement

M. Aljerf; K. Georgarakis; A. R. Yavari

doi:10.1016/j.actamat.2011.02.039

Shaping of metallic glasses by stress-annealing without thermal embrittlement

M. Aljerf, K. Georgarakis, A. R. Yavari

Research output: Contribution to journal › Article › peer-review

23 Citations (Scopus)

Abstract

Thermomechanical shaping of metallic glasses has previously been reported to result in severe thermal embrittlement. This phenomenon is most likely the reason why little effort has been made to exploit the mechanical properties of complex shapes attainable by thermomechanical shaping of metallic glass tapes and ribbons. The present study revealed time-temperature windows in which metallic glasses can be shaped by thermal annealing while remaining fully ductile. These include binary (Fe₈₃B₁₇, Co ₈₀B₂₀ and Pd₈₂Si₁₈), ternary (Fe_81.5B_14.5Si₄ and Cu₆₀Zr ₃₀Al₁₀) and more complex quaternary Zr₇₀Ni ₁₆Cu₆Al₈ glassy alloys of both metal-metalloid and metal-metal types. All showed full bending ductility after shaping. The thermomechanical processing leading to full shaping without thermal embrittlement was successfully modeled using the approach of A.I. Taub (Acta Metallurgica 1981) based on the free-volume model of structural relaxation. The results are of direct interest for applications of metallic glasses as springs.

Original language	English
Pages (from-to)	3817-3824
Number of pages	8
Journal	Acta Materialia
Volume	59
Issue number	10
DOIs	https://doi.org/10.1016/j.actamat.2011.02.039
Publication status	Published - 2011 Jun 1

Keywords

Free volume
Metallic glass
Shaping
Springs
Thermal embrittlement

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Polymers and Plastics
Metals and Alloys

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abstract = "Thermomechanical shaping of metallic glasses has previously been reported to result in severe thermal embrittlement. This phenomenon is most likely the reason why little effort has been made to exploit the mechanical properties of complex shapes attainable by thermomechanical shaping of metallic glass tapes and ribbons. The present study revealed time-temperature windows in which metallic glasses can be shaped by thermal annealing while remaining fully ductile. These include binary (Fe83B17, Co 80B20 and Pd82Si18), ternary (Fe81.5B14.5Si4 and Cu60Zr 30Al10) and more complex quaternary Zr70Ni 16Cu6Al8 glassy alloys of both metal-metalloid and metal-metal types. All showed full bending ductility after shaping. The thermomechanical processing leading to full shaping without thermal embrittlement was successfully modeled using the approach of A.I. Taub (Acta Metallurgica 1981) based on the free-volume model of structural relaxation. The results are of direct interest for applications of metallic glasses as springs.",

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N2 - Thermomechanical shaping of metallic glasses has previously been reported to result in severe thermal embrittlement. This phenomenon is most likely the reason why little effort has been made to exploit the mechanical properties of complex shapes attainable by thermomechanical shaping of metallic glass tapes and ribbons. The present study revealed time-temperature windows in which metallic glasses can be shaped by thermal annealing while remaining fully ductile. These include binary (Fe83B17, Co 80B20 and Pd82Si18), ternary (Fe81.5B14.5Si4 and Cu60Zr 30Al10) and more complex quaternary Zr70Ni 16Cu6Al8 glassy alloys of both metal-metalloid and metal-metal types. All showed full bending ductility after shaping. The thermomechanical processing leading to full shaping without thermal embrittlement was successfully modeled using the approach of A.I. Taub (Acta Metallurgica 1981) based on the free-volume model of structural relaxation. The results are of direct interest for applications of metallic glasses as springs.

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Shaping of metallic glasses by stress-annealing without thermal embrittlement

Abstract

Keywords

ASJC Scopus subject areas

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