Role of nanometer-scale quasicrystals in improving the mechanical behavior of Ti-based bulk metallic glasses

Authors
Kim, YCNa, JHPark, JMKim, DHLee, JKKim, WT
Issue Date
2003-10-13
Publisher
AMER INST PHYSICS
Citation
APPLIED PHYSICS LETTERS, v.83, no.15, pp.3093 - 3095
Abstract
The effect of the precipitation of nanosized quasicrystals on the mechanical properties of Ti-Zr-Cu-Ni-Be bulk metallic glasses (BMG) has been investigated. The Ti40Zr29Cu8Ni7Be16 BMG crystallizes by forming a few nanometer-size quasicrystals in the amorphous matrix, enabling the fabrication of quasicrystal-reinforced BMG matrix composites. Simultaneous improvement of strength and ductility can be obtained when 3-5-nm-size quasicrystals are isolated and homogeneously distributed in an amorphous matrix. The fracture strength and global strain, respectively, increase from 1921 MPa and 5.1% for as-cast BMG to 2084 MPa and 6.2% for partially crystallized BMG with the volume fraction of similar to7% quasicrystals. These improvements may be attributed to the structural similarity between quasicrystalline and amorphous phases. Stable low-energy interface between two phases may act as a source for multiple-shear-band formation. (C) 2003 American Institute of Physics.
Keywords
ICOSAHEDRAL PHASE-TRANSFORMATION; AL-CU-V; AMORPHOUS-ALLOYS; HIGH-STRENGTH; DUCTILITY; KINETICS; ICOSAHEDRAL PHASE-TRANSFORMATION; AL-CU-V; AMORPHOUS-ALLOYS; HIGH-STRENGTH; DUCTILITY; KINETICS
ISSN
0003-6951
URI
https://pubs.kist.re.kr/handle/201004/138145
DOI
10.1063/1.1616198
Appears in Collections:
KIST Article > 2003
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