Effects of Au-addition on plastic deformation ability of Zr-Cu-Ni-Al bulk metallic glasses

Masahiro Yamada, Tohru Yamasaki, Kazutaka Fujita, Yoshihiko Yokoyama, Do Hyang Kim

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Effects of Au-addition on plastic deformation ability of Zr-Cu-Ni-Al bulk metallic glasses (BMGs) during compression and tensile tests have been examined. Zr65Cu20Ni5Al10 BMG(Zr65) and Zr60+xCu22-xNi5Al10Au3(x=0, 5, 6.5, 8, 9 at%) BMGs (Zr60Au3-Zr69Au3) have been prepared by a tilt casting method. By the Au-addition on the BMGs containing Zr-content of 65 at% and more, precipitation of icosahedral quasicrystalline phase (I-phase) in supercooled liquids was observed, resulting in large increase of viscosity in the supercooled liquids. Compression and tensile tests were carried out in these BMGs under various strain rates of 1∼5 × 10-4/s at room temperature. In the compression test of the Zr65 BMG, plastic strain at fracture was about 10% and only several localized shear bands were observed. In the Zr65Au3 and Zr66.5Au3 BMGs, plastic strains at fracture were largely increased to 20% and above. In these cases, initial plastic strains of about 5% with large number of shear band were observed as macroscopically homogeneous deformation, and successive plastic strains along main shear band was observed. In the tensile test, large plastic strain at fracture of about 0.5% was also observed for the Zr66.5Au3 BMG. By transmission electron microscopic observations of the Au-addition BMGs, precipitation of nano-crystallites having about 10 nm in diameter was observed near the fractured surfaces of the compressive and tensile test specimens. Viscosity of supercooled liquids in shear bands was estimated by the stress-drop of serrations in the compressive stress-strain curves. It is considered that the large increase of the plastic strain is due to the drastic increase of the viscosity of the supercooled liquids formed inside shear bands during plastic deformation.

Original languageEnglish
Pages (from-to)449-458
Number of pages10
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume78
Issue number12
DOIs
Publication statusPublished - 2014 Dec 1

Fingerprint

Metallic glass
metallic glasses
plastic deformation
Plastic deformation
Shear bands
plastics
tensile tests
compression tests
shear
Compaction
viscosity
liquids
Liquids
Viscosity
Viscosity of liquids
Stress-strain curves
Compressive stress
Crystallites
crystallites
strain rate

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

Cite this

Yamada, Masahiro ; Yamasaki, Tohru ; Fujita, Kazutaka ; Yokoyama, Yoshihiko ; Kim, Do Hyang. / Effects of Au-addition on plastic deformation ability of Zr-Cu-Ni-Al bulk metallic glasses. In: Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals. 2014 ; Vol. 78, No. 12. pp. 449-458.
@article{37cc27c7170245f38dc2e110259d1b5f,
title = "Effects of Au-addition on plastic deformation ability of Zr-Cu-Ni-Al bulk metallic glasses",
abstract = "Effects of Au-addition on plastic deformation ability of Zr-Cu-Ni-Al bulk metallic glasses (BMGs) during compression and tensile tests have been examined. Zr65Cu20Ni5Al10 BMG(Zr65) and Zr60+xCu22-xNi5Al10Au3(x=0, 5, 6.5, 8, 9 at{\%}) BMGs (Zr60Au3-Zr69Au3) have been prepared by a tilt casting method. By the Au-addition on the BMGs containing Zr-content of 65 at{\%} and more, precipitation of icosahedral quasicrystalline phase (I-phase) in supercooled liquids was observed, resulting in large increase of viscosity in the supercooled liquids. Compression and tensile tests were carried out in these BMGs under various strain rates of 1∼5 × 10-4/s at room temperature. In the compression test of the Zr65 BMG, plastic strain at fracture was about 10{\%} and only several localized shear bands were observed. In the Zr65Au3 and Zr66.5Au3 BMGs, plastic strains at fracture were largely increased to 20{\%} and above. In these cases, initial plastic strains of about 5{\%} with large number of shear band were observed as macroscopically homogeneous deformation, and successive plastic strains along main shear band was observed. In the tensile test, large plastic strain at fracture of about 0.5{\%} was also observed for the Zr66.5Au3 BMG. By transmission electron microscopic observations of the Au-addition BMGs, precipitation of nano-crystallites having about 10 nm in diameter was observed near the fractured surfaces of the compressive and tensile test specimens. Viscosity of supercooled liquids in shear bands was estimated by the stress-drop of serrations in the compressive stress-strain curves. It is considered that the large increase of the plastic strain is due to the drastic increase of the viscosity of the supercooled liquids formed inside shear bands during plastic deformation.",
author = "Masahiro Yamada and Tohru Yamasaki and Kazutaka Fujita and Yoshihiko Yokoyama and Kim, {Do Hyang}",
year = "2014",
month = "12",
day = "1",
doi = "10.2320/jinstmet.J2014042",
language = "English",
volume = "78",
pages = "449--458",
journal = "Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals",
issn = "0021-4876",
publisher = "Japan Institute of Metals (JIM)",
number = "12",

}

Effects of Au-addition on plastic deformation ability of Zr-Cu-Ni-Al bulk metallic glasses. / Yamada, Masahiro; Yamasaki, Tohru; Fujita, Kazutaka; Yokoyama, Yoshihiko; Kim, Do Hyang.

In: Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals, Vol. 78, No. 12, 01.12.2014, p. 449-458.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Effects of Au-addition on plastic deformation ability of Zr-Cu-Ni-Al bulk metallic glasses

AU - Yamada, Masahiro

AU - Yamasaki, Tohru

AU - Fujita, Kazutaka

AU - Yokoyama, Yoshihiko

AU - Kim, Do Hyang

PY - 2014/12/1

Y1 - 2014/12/1

N2 - Effects of Au-addition on plastic deformation ability of Zr-Cu-Ni-Al bulk metallic glasses (BMGs) during compression and tensile tests have been examined. Zr65Cu20Ni5Al10 BMG(Zr65) and Zr60+xCu22-xNi5Al10Au3(x=0, 5, 6.5, 8, 9 at%) BMGs (Zr60Au3-Zr69Au3) have been prepared by a tilt casting method. By the Au-addition on the BMGs containing Zr-content of 65 at% and more, precipitation of icosahedral quasicrystalline phase (I-phase) in supercooled liquids was observed, resulting in large increase of viscosity in the supercooled liquids. Compression and tensile tests were carried out in these BMGs under various strain rates of 1∼5 × 10-4/s at room temperature. In the compression test of the Zr65 BMG, plastic strain at fracture was about 10% and only several localized shear bands were observed. In the Zr65Au3 and Zr66.5Au3 BMGs, plastic strains at fracture were largely increased to 20% and above. In these cases, initial plastic strains of about 5% with large number of shear band were observed as macroscopically homogeneous deformation, and successive plastic strains along main shear band was observed. In the tensile test, large plastic strain at fracture of about 0.5% was also observed for the Zr66.5Au3 BMG. By transmission electron microscopic observations of the Au-addition BMGs, precipitation of nano-crystallites having about 10 nm in diameter was observed near the fractured surfaces of the compressive and tensile test specimens. Viscosity of supercooled liquids in shear bands was estimated by the stress-drop of serrations in the compressive stress-strain curves. It is considered that the large increase of the plastic strain is due to the drastic increase of the viscosity of the supercooled liquids formed inside shear bands during plastic deformation.

AB - Effects of Au-addition on plastic deformation ability of Zr-Cu-Ni-Al bulk metallic glasses (BMGs) during compression and tensile tests have been examined. Zr65Cu20Ni5Al10 BMG(Zr65) and Zr60+xCu22-xNi5Al10Au3(x=0, 5, 6.5, 8, 9 at%) BMGs (Zr60Au3-Zr69Au3) have been prepared by a tilt casting method. By the Au-addition on the BMGs containing Zr-content of 65 at% and more, precipitation of icosahedral quasicrystalline phase (I-phase) in supercooled liquids was observed, resulting in large increase of viscosity in the supercooled liquids. Compression and tensile tests were carried out in these BMGs under various strain rates of 1∼5 × 10-4/s at room temperature. In the compression test of the Zr65 BMG, plastic strain at fracture was about 10% and only several localized shear bands were observed. In the Zr65Au3 and Zr66.5Au3 BMGs, plastic strains at fracture were largely increased to 20% and above. In these cases, initial plastic strains of about 5% with large number of shear band were observed as macroscopically homogeneous deformation, and successive plastic strains along main shear band was observed. In the tensile test, large plastic strain at fracture of about 0.5% was also observed for the Zr66.5Au3 BMG. By transmission electron microscopic observations of the Au-addition BMGs, precipitation of nano-crystallites having about 10 nm in diameter was observed near the fractured surfaces of the compressive and tensile test specimens. Viscosity of supercooled liquids in shear bands was estimated by the stress-drop of serrations in the compressive stress-strain curves. It is considered that the large increase of the plastic strain is due to the drastic increase of the viscosity of the supercooled liquids formed inside shear bands during plastic deformation.

UR - http://www.scopus.com/inward/record.url?scp=84922587419&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84922587419&partnerID=8YFLogxK

U2 - 10.2320/jinstmet.J2014042

DO - 10.2320/jinstmet.J2014042

M3 - Article

AN - SCOPUS:84922587419

VL - 78

SP - 449

EP - 458

JO - Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals

JF - Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals

SN - 0021-4876

IS - 12

ER -