Anisotropic mechanical properties of amorphous Zr-based foams with aligned, elongated pores

Marie E. Cox; David C. Dunand

doi:10.1016/j.actamat.2013.06.028

Anisotropic mechanical properties of amorphous Zr-based foams with aligned, elongated pores

Marie E. Cox^*, David C. Dunand

^*Corresponding author for this work

Materials Science and Engineering

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

9 Scopus citations

Abstract

Equal-channel angular extrusion is used to consolidate a blend of amorphous Zr_56.3Nb_5.1Cu_15.6Ni_12.9Al _10.0 and crystalline W powders into dense composites. Chemical dissolution of the crystalline phase results in amorphous foams with elongated pores, aligned at a 22-28 angle with respect to the extrusion direction, whose compressive properties are studied for various orientations. As the angle between the pore long direction and the applied stress direction increases from 0 to 68, there is a significant decrease in loading stiffness and peak stress, as expected from predictive analytical models; however, the observed increase in stiffness and peak stress observed when the pores are oriented 90 to the direction of loading is not predicted by all of the models. Foams with pores aligned 24-68 to the direction of loading show increased plastic bending in individual walls and accumulation in microscopic damage without failure, leading to increased compressive ductility and absorbed energy over other orientations.

Original language	English (US)
Pages (from-to)	5937-5948
Number of pages	12
Journal	Acta Materialia
Volume	61
Issue number	16
DOIs	https://doi.org/10.1016/j.actamat.2013.06.028
State	Published - Sep 2013

Keywords

Bulk metallic glass
Equal channel angular press
Metallic foam
Porous material
Zirconium-based glassy alloy

ASJC Scopus subject areas

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

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10.1016/j.actamat.2013.06.028

Cite this

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title = "Anisotropic mechanical properties of amorphous Zr-based foams with aligned, elongated pores",

abstract = "Equal-channel angular extrusion is used to consolidate a blend of amorphous Zr56.3Nb5.1Cu15.6Ni12.9Al 10.0 and crystalline W powders into dense composites. Chemical dissolution of the crystalline phase results in amorphous foams with elongated pores, aligned at a 22-28 angle with respect to the extrusion direction, whose compressive properties are studied for various orientations. As the angle between the pore long direction and the applied stress direction increases from 0 to 68, there is a significant decrease in loading stiffness and peak stress, as expected from predictive analytical models; however, the observed increase in stiffness and peak stress observed when the pores are oriented 90 to the direction of loading is not predicted by all of the models. Foams with pores aligned 24-68 to the direction of loading show increased plastic bending in individual walls and accumulation in microscopic damage without failure, leading to increased compressive ductility and absorbed energy over other orientations.",

keywords = "Bulk metallic glass, Equal channel angular press, Metallic foam, Porous material, Zirconium-based glassy alloy",

author = "Cox, {Marie E.} and Dunand, {David C.}",

note = "Funding Information: M.E.C. was supported by a National Science Foundation Graduate Research Fellowship. This work was funded by the Army Research Laboratory (ARL) and the authors thank Drs. Laszlo Kecskes and Suveen Mathaudhu (ARL) for useful discussion and Mr. Micah Gallagher (ARL) for assistance in machining samples. The authors also thank Mr. Larry Jones at Ames Laboratory (Department of Energy) for BMG powder preparation; they acknowledge useful discussions with, and use of the ECAE equipment of, Prof. K. Ted Hartwig (Texas A&M University, TAMU) as well as the experimental assistance of Mr. Robert Barber and Mr. David Foley (TAMU) in operating the equipment.",

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PY - 2013/9

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N2 - Equal-channel angular extrusion is used to consolidate a blend of amorphous Zr56.3Nb5.1Cu15.6Ni12.9Al 10.0 and crystalline W powders into dense composites. Chemical dissolution of the crystalline phase results in amorphous foams with elongated pores, aligned at a 22-28 angle with respect to the extrusion direction, whose compressive properties are studied for various orientations. As the angle between the pore long direction and the applied stress direction increases from 0 to 68, there is a significant decrease in loading stiffness and peak stress, as expected from predictive analytical models; however, the observed increase in stiffness and peak stress observed when the pores are oriented 90 to the direction of loading is not predicted by all of the models. Foams with pores aligned 24-68 to the direction of loading show increased plastic bending in individual walls and accumulation in microscopic damage without failure, leading to increased compressive ductility and absorbed energy over other orientations.

AB - Equal-channel angular extrusion is used to consolidate a blend of amorphous Zr56.3Nb5.1Cu15.6Ni12.9Al 10.0 and crystalline W powders into dense composites. Chemical dissolution of the crystalline phase results in amorphous foams with elongated pores, aligned at a 22-28 angle with respect to the extrusion direction, whose compressive properties are studied for various orientations. As the angle between the pore long direction and the applied stress direction increases from 0 to 68, there is a significant decrease in loading stiffness and peak stress, as expected from predictive analytical models; however, the observed increase in stiffness and peak stress observed when the pores are oriented 90 to the direction of loading is not predicted by all of the models. Foams with pores aligned 24-68 to the direction of loading show increased plastic bending in individual walls and accumulation in microscopic damage without failure, leading to increased compressive ductility and absorbed energy over other orientations.

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Anisotropic mechanical properties of amorphous Zr-based foams with aligned, elongated pores

Abstract

Keywords

ASJC Scopus subject areas

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