Abstract
Rapidly solidified Ni-Al-Hf alloys of ternary eutectic compositions were studied by X-ray diffractometry, transmission electron microscopy and differential scanning calorimetry. Ni66Hf20Al14 amorphous alloy with relatively high Hf/Al ratio showed high tensile strength of 1600 MPa and high thermal stability against crystallization. The formation of a nanoscale metastable intermetallic compound having a body-centered cubic lattice with a lattice parameter of a = 1.22 nm was observed in the alloys with higher Al than Hf content. The transformation of an amorphous+metastable cubic mixture to AlNi3 produces AlNi3 of the same composition as the AlNi3 phase formed on rapid solidification. Pm3̄m AlNi3 phase can dissolve up to 11 at.% Hf.
Original language | English |
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Pages (from-to) | 151-156 |
Number of pages | 6 |
Journal | Journal of Alloys and Compounds |
Volume | 340 |
Issue number | 1-2 |
DOIs | |
Publication status | Published - 2002 Jun 26 |
Keywords
- Alloys
- Amorphous materials
- Calorimetry
- Rapid soldification
- TEM
ASJC Scopus subject areas
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry