Coarsening of precipitates and dispersoids in aluminium alloy matrices : a consolidation of the available experimental data

• Published in: Journal of materials science Vol. 29; no. 7; pp. 1895 - 1900
• Main Authors: RYLANDS, L. M, WILKES, D. M. J, RAINFORTH, W. M, JONES, H
• Format: Journal Article
• Language: English
• Published: Heidelberg Springer 01.04.1994
• Subjects: Applied sciences; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Materials science; Metals. Metallurgy; Phase diagrams and microstructures developed by solidification and solid-solid phase transformations; Physics; Precipitation; Solid-phase precipitation; Aluminium base alloys; Reviews; Copper alloys; Mechanical properties; Iron alloys; Dispersions; Lithium alloys; Precipitates; Zirconium alloys
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1007/BF00351310

Experimental data on the coarsening of precipitates and dispersoids in Al-based matrices are reviewed. Available data are tabulated as K = r exp 3 -r exp 3 sub 0 )/t where r sub 0 is the initial particle radius and r is its value after time t at a temperature T, and then plotted as log (KT) against 1/T for consolidation and assessment. Available data for coarsening of L1 sub 2 -Al sub 3 (Zr,V) and related phases in zirconium-containing alloys and of Al sub 12 Fe sub 3 Si and related phases in Al-Fe based alloys indicate (i) rates of coarsening at 375-475 deg C (0.7-0.8T sub m ) five to eight orders of magnitude less than would be expected for delta ', theta ' and theta '' in this temperature range, and (ii) high activation energies of approx 300 and 180 kJ/mol, respectively.