Different Pathways of Phase Transition in a V–Si System Driven by Mechanical Alloying

• Published in: Materials research bulletin 1998-04, Vol.33 (4), p.539-545
• Main Authors: Liu, L, Lu, L, Lai, M.O, Magini, M, Fei, G.T, Zhang, L.D
• Format: Article
• Language: English
• Subjects: A. intermetallic compounds; Applied sciences; C. electron microscopy; C. X-ray diffraction; Condensed matter: structure, mechanical and thermal properties; Constant-composition solid-solid phase transformations: polymorphic, massive, and order-disorder; Cross-disciplinary physics: materials science; rheology; D. phase transitions; Equations of state, phase equilibria, and phase transitions; Exact sciences and technology; Materials science; Metals. Metallurgy; Phase diagrams and microstructures developed by solidification and solid-solid phase transformations; Physics; Solid-solid transitions; Specific phase transitions
• ISSN: 0025-5408; 1873-4227
• DOI: 10.1016/S0025-5408(97)00238-9

Solid state reactions induced by mechanical alloying of an elemental powder mixture of V and Si with a composition of V 75Si 25 were investigated using X-ray diffraction and scanning and transmission electron microscopy. It was found that the phase transitions in this system are closely related to the milling intensity. High-energy milling mainly causes the formation of intermetallic compounds, whereas low-energy milling leads to amorphization. The thermodynamics and kinetics related to the different pathways of V–Si phase transition are briefly discussed in this paper. The effect of air contamination on phase transition is also addressed.