Effect of nanoscale precipitation on strengthening of ferritic ODS Fe–Cr–Al alloy. (October 2013)

• Record Type: Journal Article
• Authors: Capdevila, C.; Chao, J.; Jimenez, J. A.; Miller, M. K.
• Is Part Of: Materials science and technology. Volume 29:Number 10(2013:Oct.)
• Page Start: 1179
• Page End: 1184
• Publication Date: 2013-10
• Subjects: Phase separation -- Ferrous alloy -- Mechanical alloying -- Tomography -- Thermoelectric power -- Spinodal decomposition; Materials science -- Periodicals; Microstructure -- Periodicals; Metallurgy -- Periodicals; 620.1105
• DOI: 10.1179/1743284713Y.0000000215
• Languages: English
• ISSNs: 0267-0836

Abstract

Abstract : The kinetics of Fe rich α and Cr rich α ′ phase separation during aging of Fe–Cr–Al oxide dispersion strengthened alloys have been analysed with a combination of atom probe tomography and thermoelectric power measurements. The slight lattice parameter decrease measured by X-ray diffraction after thermal aging was associated with a lattice misfit between the emerging α and α ′ domains. The elastic strain associated with this misfit and the different elastic moduli for the α and α ′ phases would produce an increase in internal stresses that would retard the motion of dislocations and thus would be the main cause for the strengthening.