Mechanically induced cyclic crystalline-amorphous transformations of ball milled Co{sub 50}Ti{sub 50} alloy
- Tohoku Univ., Sendai (Japan). Inst. for Materials Research
Mechanical alloying (MA) has been widely employed for preparation of several metallic amorphous alloys using ball milling and/or rod milling techniques. In the present work, a single amorphous phase of Co{sub 50}Ti{sub 50} alloy powder is obtained after a short MA time (22 ks), using a high energy ball mill. The obtained amorphous does not withstand against the impact and shear forces generated by the milling media and crystallizes into bcc-Co{sub 50}Ti{sub 50} after further milling (86 ks). The formed crystalline phase turns to become the same amorphous phase of Co{sub 50}Ti{sub 50} upon milling for 360 ks. Similar to mechanical grinding, this phase transformation is attributed to the accumulation of several lattice imperfections such as point and lattice defects, which raise the free energy from the stable phase (bcc-Co{sub 50}Ti{sub 50}) to a less stable phase (amorphous). Further milling leads to the formation of crystalline and/or amorphous phases depending on the MA time. The present work demonstrates a cyclic crystalline-amorphous transformations by MA.
- OSTI ID:
- 474215
- Journal Information:
- Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 9 Vol. 36; ISSN 1359-6462; ISSN SCMAF7
- Country of Publication:
- United States
- Language:
- English
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