J. Phys. IV France
Volume 05, Numéro C7, Novembre 1995
Second International Conference on Ultra High Purity Base Metals
UHPM - 95
Page(s) C7-271 - C7-275
Second International Conference on Ultra High Purity Base Metals
UHPM - 95

J. Phys. IV France 05 (1995) C7-271-C7-275

DOI: 10.1051/jp4:1995732

Influence of Small Amounts of Boron on the Structural Evolution of Nanocrystalline Ni3Al During Thermal Treatments

A. Korznikov1, 2, O. Dimitrov1, A. Quivy1, G. Korznikova2, J. Devaud1 and R. Valiev2

1  Centre d'Etudes de Chimie Métallurgique, CNRS, 94407 Vitry-sur-Seine, France
2  Institute for Metals Superplasticity Problems, Oufa, Russia

The influence of a boron addition (0.1 wt%) on the structural stability of high-purity nanocrystalline Ni3Al intermetallic compounds was investigated. The nanocrystalline structure was obtained by severe shear deformation under quasi-hydrostatic pressure. Residual electrical resistivity, Vickers microhardness, X-Ray diffraction and transmission electron microscopy were used to characterize the material evolution during thermal treatments in the temperature range 293-1313 K. After severe deformation the materials were disordered with a smaller crystallite size in the boron-doped compound than in the pure one. The boron addition was found to shift the long-range ordering, as well as the recovery of the properties investigated to higher temperatures, i.e. to improve the thermal stability of the structure.

© EDP Sciences 1995