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Research Papers: Contact Mechanics

Nanoindentation Studies of the Effects of Ion Irradiation on the Near Surface Mechanical Response of Annealed Ti40Cu32Pd14Zr10Sn2Si2 Metallic Glass Ribbons

[+] Author and Article Information
A. Zare

School of Mechanical and
Aerospace Engineering,
Oklahoma State University,
Stillwater, OK 74078
e-mail: arezoo.zare@okstate.edu

M. J. Klopfstein

Clinical Assistant Professor
School of Mechanical and
Aerospace Engineering,
Oklahoma State University,
Stillwater, OK 74078
e-mail: matthew.klopfstein@okstate.edu

D. A. Lucca

Regents Professor
School of Mechanical and
Aerospace Engineering,
Oklahoma State University,
Stillwater, OK 74078
e-mail: lucca@okstate.edu

L. Price

Department of Nuclear Engineering,
Texas A&M University,
College Station, TX 77840
e-mail: lloydmprice@gmail.com

L. Shao

Associate Professor
Department of Nuclear Engineering,
Texas A&M University,
College Station, TX 77840
e-mail: lshao@tamu.edu

G. Q. Xie

Associate Professor
Institute for Materials Research,
Tohoku University,
Sendai 980-8577, Japan
e-mail: xiegq@imr.tohoku.ac.jp

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received June 22, 2015; final manuscript received October 2, 2015; published online July 14, 2016. Assoc. Editor: Min Zou.

J. Tribol 138(4), 041403 (Jul 14, 2016) (8 pages) Paper No: TRIB-15-1221; doi: 10.1115/1.4032820 History: Received June 22, 2015; Revised October 02, 2015

Nanoindentation experiments with a Berkovich indenter and a spherical indenter were performed to study the effects of annealing at temperatures below the glass transition temperature and room temperature ion irradiation on the near surface mechanical response of Ti40Cu32Pd14Zr10Sn2Si2 metallic glass (MG) ribbons. The specimens were isothermally annealed in vacuum at 573 K and 673 K for 4 hrs. Annealing was seen to increase the hardness of the specimens and decrease their ductility. The annealed specimens were subsequently irradiated by 3.5 MeV Cu2+ ions at room temperature using a fluence of 1 × 1012 ions/cm2 or 1 × 1016 ions/cm2. Nanoindentation experiments on the annealed and irradiated specimens showed a reduction in hardness and an increase in ductility for the specimens irradiated at a fluence of 1 × 1012 ions/cm2. Although the values of the mean contact pressure and critical shear stress under the spherical indenter showed an easier formation of shear bands after irradiation, increasing the irradiation fluence to 1 × 1016 ions/cm2 was seen to increase the hardness value and decrease the ductility of the specimens.

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References

Figures

Grahic Jump Location
Fig. 1

Depth profiles of Cu2+ ions and displacement density caused by 3.5 MeV Cu2+ ion irradiation

Grahic Jump Location
Fig. 2

Force versus penetration depth curves obtained from Berkovich indentations in the as-spun and annealed specimens

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Fig. 3

Force versus penetration curves obtained from spherical indentations in the as-spun and annealed specimens. The prediction of the Hertz contact solution is also shown on the left curve.

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Fig. 4

Force versus penetration curves obtained from spherical indentations in the as-spun specimen and the as-spun specimens irradiated with a fluence of 1 × 1012 ions/cm2 and 1 × 1016 ions/cm2. Arrows denote the initial displacement burst and the inset shows a closer look of a possible displacement burst.

Grahic Jump Location
Fig. 5

Force versus penetration depth curves for spherical indentations performed on the specimens annealed at 573 K and irradiated. Arrows denote the initial displacement burst.

Grahic Jump Location
Fig. 6

Force versus penetration depth curves for spherical indentations performed on the specimens annealed at 673 K and irradiated. Arrows denote the initial displacement burst.

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