Journal
THERMOCHIMICA ACTA
Volume 492, Issue 1-2, Pages 73-78Publisher
ELSEVIER
DOI: 10.1016/j.tca.2009.01.027
Keywords
Differential Scanning Calorimetry (DSC); HyperDSC; Aluminium; Alloy 6005A; Age hardening; Continuous cooling precipitation (CCP) diagrams
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The purpose of this report is to present a methodology to record continuous cooling precipitation (CCP) diagrams over the complete range of technical interesting cooling rates for some aluminium wrought alloys. With the information out of CCP-diagrams, the quenching step of the heat-treatment process Age Hardening can be optimized. The nanosized precipitations were detected via Differential Scanning Calorimetry (DSC) by identifying their exothermal heat. Aluminium wrought alloy EN AW-6005A was age hardened in three different DSCs whereby cooling rate range varies over 3 orders of magnitude. With increasing cooling rate, the precipitation heat is decreasing. The CCP-diagram covers cooling rates form close to equilibrium conditions at 0.1 K/min up to the critical cooling rate at 375 K/min where the precipitation reaction is suppressed completely. The DSC delivers a very useful method to record full range CCP-diagrams of aluminium alloys. Opposite to other possible methods, it also delivers a measure for the amount of the nanosized precipitates by the amount of released heat. A strategy is presented for the deconvolution ofoverlapping DSC-peaks. (C) 2009 Elsevier B.V. All rights reserved.
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