期刊
ACTA MATERIALIA
卷 56, 期 15, 页码 3723-3738出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2008.04.005
关键词
aluminium alloys; aging; isothermal heat treatment; phase transformation kinetics; precipitation
The effect of heat treatment on precipitation and growth of coherent nanometer-sized Al-3(Sc,Zr) particles and the effect of these particles on tensile properties of a direct chill (DC) cast Al-Zn-Mg-Cu-Sc-Zr alloy were Studied. The size distribution, average size, number density and volume fraction of the Al-3(Sc,Zr) particles were determined as a function of the solution treatment temperature and time. An increase in the solution treatment temperature and time resulted in Al-3(Sc,Zr) particles with a larger mean diameter, higher volume fraction and lower number density. The particle size distributions were described well by normal (Gaussian) distributions. The kinetics of the phase transformation followed the Kolmogorov-Johnson-Mehl-Avrami law, with the Avrami exponent m = 0.404. Room temperature tensile properties were evaluated in the as-solution treated and artificially aged conditions. The coherent nanometer-sized Al-3(Sc,Zr) particles provided additional Orowan strengthening, which increased with increasing particle volume fraction and decreasing particle size, and varied from 75 to 118 MPa after different heat treatments. (c) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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