Order–disorder transformation in the Ni–4.49 at.% Al alloy

• Published in: Journal of alloys and compounds Vol. 414; no. 1; pp. 55 - 59
• Main Authors: Adorno, A.T., Gárlipp, W., Cilense, M., Silva, R.A.G.
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 13.04.2006; Elsevier
• Subjects: Atomic order transformation; Constant-composition solid-solid phase transformations: polymorphic, massive, and order-disorder; Cross-disciplinary physics: materials science; rheology; Electrical properties; Exact sciences and technology; Materials science; Metals and alloys; Phase diagrams and microstructures developed by solidification and solid-solid phase transformations; Physics; Electrical properties; Metals and alloys; Atomic order transformation; Antiferromagnetism; Differential scanning calorimetry; Order-disorder transformations; Electrical conductivity; Nickel alloys; Dilute alloys; Microhardness; Transmission electron microscopy; Aluminium alloys; Ordering; Vacancy migration; Atomic structure; Activation energy
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2005.07.020

The order–disorder transformation in the Ni–4.49 at.% Al alloy was studied using electrical resistivity measurements, microhardness measurements, differential scanning calorimetry (DSC) and transmission electron microscopy (TEM). The results confirmed the ordering behavior expected for Ni–Al dilute alloys and the suggested relation between resistivity changes and microhardness changes with anti-ferromagnetic spin ordering. The higher value obtained for the activation energy of vacancy migration was associated with a decrease in the Al concentration gradient near solute-depleted regions.