Kinetics of long-range order relaxation in Ni3Al: The effect of stoichiometry

Autor:	O. Dimitrov, X Zhang, C. Dimitrov
Rok vydání:	1996
Předmět:	Self-diffusion Materials science Polymers and Plastics Relaxation (NMR) Kinetics Metals and Alloys Intermetallic Mineralogy Thermodynamics Activation energy Isothermal process Electronic Optical and Magnetic Materials Electrical resistivity and conductivity Ceramics and Composites Stoichiometry
Zdroj:	Acta Materialia. 44:1691-1699
ISSN:	1359-6454
Popis:	The isothermal relaxation of long-range order (LRO) after small temperature changes has been investigated in Ni 3 Al intermetallic compounds (with 24.6, 25.0 and 26.5 at% Al) by measurements of the residual electrical resistivity. The equilibrium residual electrical resistivities were found to be consistent with theoretically calculated values of the LRO parameter. The approach to equilibrium could be satisfactorily represented by a sum of two exponentials; the relaxation rate is minimum at the stoichiometric composition. The activation enthalpies of the two processes are not significantly different (2.63 – 2.88 eV); they do not display an important composition dependence. A model is proposed for explaining the existence of the two isothermal relaxation processes.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::e4fc1d84f26648d1406f5b8983bde9a7 https://doi.org/10.1016/1359-6454(95)00298-7 Zobrazit plný text záznamu Full Text from ScienceDirect