MECHANICAL PROPERTIES TRANSFORMATION ON Zr54Al17Co29 BULK METALLIC GLASS BY PARTIAL CRYSTALLIZATION
Abstract: Study on
biomaterials is recently essential for rapid development of medical application
and Zr54Al17Co29 BMG becomes promising candidate due to the lack of toxic
elements. Partial crystallization by isothermal annealing at SCL region was
used to variate the crystallinities ofBMG. The structural and thermal
properties of as cast and partially crystallized samples wereconfirmed by XRD
and DSC test, while microvickers and compression test were further utilizedto
investigate their mechanical properties. By the higher crystallinity, the
hardness could beslightly increased in range 540 ± 5 to 575 ± 5 Hv. As-cast
sample shows the yield strength andplastic strain of 2130 ± 75 MPa and 2.2 ±
1.6%. The yield strength is increased by the presence of 10% nanocrystal,
afterwards, fall and raise phenomena are obtained with further crystallinity. However,
with higher crystallinity, the plasticity is significantly degraded and no more
plastic strainobserved at sample with 50% of crystallinity. Both the presence
of nanocrystalline phase and freevolume annihilation are the reason of
mechanical properties change on the Zr-based BMG.
Author: Yanuar Rohmat Aji
Pradana, Jason Shian-Ching Jang, Sofyan Arief Setyabudi
Journal Code: jptmesingg170003
