Enhancement of room-temperature plasticity in a bulk metallic glass by finely dispersed porosity

Journal Article · Mon Jun 20 00:00:00 EDT 2005 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.1953884· OSTI ID:20702483

Wada, Takeshi; Inoue, Akihisa; Greer, Alan Lindsay ^[1]

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1. Institute for Materials Research, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577 (Japan)

Melts of Pd{sub 42.5}Cu{sub 30}Ni{sub 7.5}P{sub 20} (at. %) held under pressurized hydrogen are cast into bulk metallic glass (BMG) rods with fine (20-30 {mu}m diameter) pores uniformly dispersed. The low overall porosities (<4%) lead to only small reductions in Young modulus and yield strength, but to dramatically enhanced plasticity in compression: Rupture energy as high as 295 MJ m{sup -3}, compared to 16 MJ m{sup -3} for the pore-free BMG. The pores force the proliferation of shear bands below the overall failure stress, a process of interest for toughening BMGs, materials for which shear localization in deformation restricts structural applications.

• OSTI ID: 20702483
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 25 Vol. 86; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CASTINGS
COMPRESSION
COPPER COMPOUNDS
HYDROGEN
LEAD COMPOUNDS
METALLIC GLASSES
NICKEL COMPOUNDS
PHOSPHORUS COMPOUNDS
PLASTICITY
POROSITY
RUPTURES
SHEAR
STRESSES
TEMPERATURE RANGE 0273-0400 K
YIELD STRENGTH
YOUNG MODULUS