Cyclic solid-state transformations during ball milling of aluminum zirconium powder and the effect of milling speed
- Tohoku Univ., Sendai (Japan). Inst. for Materials Research
- Kitami Inst. of Tech., Hokkaido (Japan). Dept. of Materials Science
The authors have demonstrated cyclic amorphous-crystalline amorphous phase transformations in mechanically alloyed Al{sub 50}Zr{sub 50} powder. The milling times and the milling speed govern this reaction. The results show that a single amorphous phase is obtained after 24 hours of the milling time, using a milling speed of 360 rpm (I = 8). This metastable phase transforms into a stable phase of orthorhombic-AlZr upon further milling (48 hours) and returns to the same amorphous phase of Al{sub 50}Zr{sub 50} after 72 hours of milling. Further milling leads to the formation of crystalline or amorphous phases depending on the milling time and the milling speed. Such periodic phase transformation may occur due to the accumulation of several structural defects and not because of the local temperature rise or the presence of contamination.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 677994
- Journal Information:
- Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Journal Name: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science Journal Issue: 7 Vol. 30; ISSN 1073-5623; ISSN MMTAEB
- Country of Publication:
- United States
- Language:
- English
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