High temperature deformation behavior of the Zr41.2Ti13.8Cu12.5Ni10Be22.5 bulk metallic glass

The high temperature deformation behavior of a Zr41.2Ti13.8Cu12.5Ni10Be22.5 bulk amorphous alloy has been studied in the temperature range between 351 and 461 deg C under compressive as well as tensile loading. Three types of nominal stress--strain curves under compressive loading have been identifi...

Full description

Saved in:
Bibliographic Details
Published in:Journal of non-crystalline solids 2003-03, Vol.317 (1-2), p.193-199
Main Authors: KWANG SEOK LEE, TAE KWON HA, AHN, Sangho, YOUNG WON CHANG
Format: Article
Language:English
Subjects:
Applied sciences
Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Fatigue, brittleness, fracture, and cracks
Mechanical and acoustical properties of condensed matter
Mechanical properties of solids
Metals. Metallurgy
Physics
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The high temperature deformation behavior of a Zr41.2Ti13.8Cu12.5Ni10Be22.5 bulk amorphous alloy has been studied in the temperature range between 351 and 461 deg C under compressive as well as tensile loading. Three types of nominal stress--strain curves under compressive loading have been identified depending on the strain rate and test temperature, viz., a linear stress--strain relationship with fracture at the maximum stress, large plastic deformation after stress overshoot, and steady state plastic flow without stress overshoot. The DSC analysis for the compressed specimens was also carried out to determine the change in the crystallization fraction under the various test conditions. Under tensile loading, superplastic-like deformation with a maximum elongation over 500% was observed at 431 deg C under a relatively high strain rate of 2x10 exp -2 /s. The tensile test specimens were, however, observed to exhibit a brittle fracture mode at temperatures below the glass transition temperature and above the crystallization temperature under the same initial strain rate. The superplastic-like properties characterized by the low flow stress and large elongation then appear to be very sensitive to test temperature and initial strain rate.
ISSN:0022-3093
1873-4812
DOI:10.1016/S0022-3093(02)01998-1