FABRICATION OF TiZr-BASED BULK METALLIC GLASS FOAM USING HOT-PRESSING AT DIFFERENT TEMPERATURES AND HOLDING TIMES

Abstract

Biocompatible TiZr-based bulk metallic glass foam (BMGF) plays a critical
role for bio-implant application. In this present work, a series of TiZr-based
BMGFs were successfully fabricated by using hot pressing method in an inert
gas chamber. Amorphous structure and high compactivity of the TiZr-based
BMGF were required to retain excellent properties. Temperature and holding
time during hot pressing process significantly impact on fabrication of the TiZr
based BMGF. Results from differential scanning calorimetry (DSC) and XRD
analysis point out that the applied temperatures from 763 to 793K with holding
time from 3 to 5 min are suitable for producing the TiZr-based BMGF. As a result,
the bulk alloy foam produced at the temperature of 793K and holding time of 5
min still remain amorphous state and display a high-density compact structure
after hot pressing. Bright-field TEM image indicates that the TiZr-based BMGFs
present a strong bonding-force interface between amorphous metallic glass
particles which can make a good condition for generating the foam with higher
porosity in further study.