Softening of Zr-based metallic glass induced by nanosecond pulsed laser irradiation

Hu Huang, Minqiang Jiang, Jiwang Yan

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Laser irradiation has been recently used to tune the mechanical properties of metallic glasses (MGs). However, the mechanism for plasticity improvement by laser irradiation is still not completely clear and requires further investigation. In this study, nanosecond pulsed laser irradiation is applied on a Zr-based MG surface under various laser powers, scanning speeds, and numbers of irradiation cycles. Then, the mechanical properties of the as-cast and laser-irradiated MG surfaces are characterized by nanoindentation tests. In particular, the indentation hardness, load-depth curve, serrated flow, and residual indent morphology of the surfaces are compared. The results show that the nanosecond pulsed laser irradiation softens the irradiated regions; the effect of the irradiation is slightly dependent on the laser irradiation parameters, and especially the laser scanning speed. Furthermore, laser irradiation considerably affects serrated flows in the load-depth curve and shear bands on the top surface, denoting different plastic deformation characteristics compared with the non-irradiated sample. These differences could be rationalized in terms of laser irradiation-induced formation of pre-existing shear bands in the subsurface layer, as well as thermal effects. The present results are expected to enhance the general understanding of the effects of laser irradiation on the mechanical properties of MGs.

Original languageEnglish
Pages (from-to)215-221
Number of pages7
JournalJournal of Alloys and Compounds
Volume754
DOIs
Publication statusPublished - 2018 Jul 25

Fingerprint

Metallic glass
Laser beam effects
Pulsed lasers
Shear bands
Mechanical properties
Lasers
Irradiation
Scanning
Nanoindentation
Indentation
Thermal effects
Plasticity
Loads (forces)
Plastic deformation
Hardness

Keywords

  • Laser irradiation
  • Metallic glass
  • Nanoindentation
  • Serrated flow
  • Shear band
  • Softening

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

Softening of Zr-based metallic glass induced by nanosecond pulsed laser irradiation. / Huang, Hu; Jiang, Minqiang; Yan, Jiwang.

In: Journal of Alloys and Compounds, Vol. 754, 25.07.2018, p. 215-221.

Research output: Contribution to journalArticle

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AB - Laser irradiation has been recently used to tune the mechanical properties of metallic glasses (MGs). However, the mechanism for plasticity improvement by laser irradiation is still not completely clear and requires further investigation. In this study, nanosecond pulsed laser irradiation is applied on a Zr-based MG surface under various laser powers, scanning speeds, and numbers of irradiation cycles. Then, the mechanical properties of the as-cast and laser-irradiated MG surfaces are characterized by nanoindentation tests. In particular, the indentation hardness, load-depth curve, serrated flow, and residual indent morphology of the surfaces are compared. The results show that the nanosecond pulsed laser irradiation softens the irradiated regions; the effect of the irradiation is slightly dependent on the laser irradiation parameters, and especially the laser scanning speed. Furthermore, laser irradiation considerably affects serrated flows in the load-depth curve and shear bands on the top surface, denoting different plastic deformation characteristics compared with the non-irradiated sample. These differences could be rationalized in terms of laser irradiation-induced formation of pre-existing shear bands in the subsurface layer, as well as thermal effects. The present results are expected to enhance the general understanding of the effects of laser irradiation on the mechanical properties of MGs.

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