Abstract
Ni60Pd20P17B3 alloy has high glass forming ability (GFA) and forms bulk metallic glass (BMG) which exhibits good mechanical properties of a high strength and a large plasticity. Furthermore the plastic strain of the Ni60Pd20P17B3 BMG increases with lowering temperature by 3.4 times from 295 K to 77 K. In order to know the origin of such mechanical properties and reasons of high glass formability of this alloy from an atomic scale point of view, XAFS and X-ray diffraction measurements for Ni60Pd20P20 and Ni60Pd20P17B3 metallic glasses have been done using the large scale synchrotron radiation. XAFS results of the Ni and Pd K-edge for the Ni60Pd20P20 metallic glass can be well represented by the Pd4Se-type structure model. A result of interatomic distances agrees with those of the ab initio calculations. Temperature dependence of the Debye-Waller factor reflects strong Ni-P and Pd-P bondings and a large thermal fluctuation of metal-metal bondings. A high GFA of the Ni60Pd20P17B3 alloy compared with Ni60Pd20P20 is discussed based on the XAFS and total pair distribution results.
Original language | English |
---|---|
Pages (from-to) | 135-139 |
Number of pages | 5 |
Journal | Journal of Alloys and Compounds |
Volume | 496 |
Issue number | 1-2 |
DOIs | |
Publication status | Published - 2010 Apr 30 |
Keywords
- Bulk metallic glass
- Debye-Waller factor
- NiPdP
- NiPdPB
- Synchrotron X-ray diffraction
- XAFS
ASJC Scopus subject areas
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry