TITLE

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

AUTHOR(S)
Kim, Yu Chan; Na, Jong Hyun; Park, Jin Man; Kim, Do Hyang; Lee, Jin Kyu; Kim, Won Tae
PUB. DATE
October 2003
SOURCE
Applied Physics Letters;10/13/2003, Vol. 83 Issue 15, p3093
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
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 Ti[sub 40]Zr[sub 29]Cu[sub 8]Ni[sub 7]Be[sub 16] 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 ∼7% 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. © 2003 American Institute of Physics.
ACCESSION #
11028781

 

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