Atomic disorder and phase transformation in L1[sub 2]-structure Ni[sub 3]Si by ball milling
- Univ. van Amsterdam (Netherlands). Van der Waals-Zeeman Lab.
The structural evolution of the L1[sub 2]-compound Ni[sub 3]Si upon ball milling was followed by X-ray diffraction, high-field magnetization measurement and differential scanning calorimetry (DSC). Anti-site disorder was generated in the early stages of milling and a phase transformation from the disordered L1[sub 2]-compound to the nanocrystalline f.c.c. solid solution of silicon in nickel was observed after milling for long periods. The long-range-order parameter decreases monotonously with time in the early stages of milling and reaches zero after long periods of milling. The lattice parameter and unit-cell volume also decrease gradually in the early stages of milling. A discontinuous decrease of the lattice parameter is observed during the phase transformation. The magnetic behavior at 4.2 K of ball-milled samples differs from that of the starting compound. Exothermic peaks resulting from atomic reordering and phase restoration are evident in the DSC scans of ball-milled samples. The variation of the transition heat and temperature with milling time in the intermediate stages gives more insight into the process of phase transformation.
- OSTI ID:
- 6929917
- Journal Information:
- Acta Metallurgica et Materialia; (United States), Journal Name: Acta Metallurgica et Materialia; (United States) Vol. 42:9; ISSN 0956-7151; ISSN AMATEB
- Country of Publication:
- United States
- Language:
- English
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