Reply to the comments on “Room-temperature precipitation in quenched Al-Cu-Mg alloys: a model for the reaction kinetics and yield-strength development”


Starink, M.J., Cerezo, A., Yan, J.L. and Gao, N. (2006) Reply to the comments on “Room-temperature precipitation in quenched Al-Cu-Mg alloys: a model for the reaction kinetics and yield-strength development”. Philosophical Magazine Letters, 86, (4), 243-252. (doi:10.1080/09500830600678888).

This is the latest version of this item.

Download

[img]
Preview
PDF
Download (215Kb)

Description/Abstract

Our recent work on Al-Cu-Mg-based alloys with Cu:Mg ratio close to unity showed that the rapid hardening at room temperature and the substantial heat evolution arising from the formation of Cu-Mg co-clusters. Here, it is shown that the measured enthalpy of formation of clusters (similar to 0.3 eV per Mg atom) is in reasonable agreement with expectations based on the similarity with Mg-vacancy clusters. The origin of the term GPB zones, as applied to the rapid hardening in Al-Cu-Mg-based alloys, is investigated. It is shown that current knowledge on the nanostucture and microstructure development during rapid hardening can be described without recourse to this alloy-specific term. Analysis of the kinetics of Cu-Mg co-clusters formation by DSC indicates that the formation of Cu-Mg co-cluster formation during a fast water quench can be sufficiently suppressed to cause substantial nucleation of co-clusters to occur in subsequent natural ageing and artificial ageing at low temperatures.

Item Type: Article
ISSNs: 1478-6435 (print)
Related URLs:
Keywords: precipitation, Al-Cu-Mg, cluster, co-cluster, GPB zone, calorimetry, 3DAP, nucleation
Subjects: T Technology > TN Mining engineering. Metallurgy
Q Science > QC Physics
Divisions: University Structure - Pre August 2011 > School of Engineering Sciences
ePrint ID: 39278
Date Deposited: 26 Jun 2006
Last Modified: 27 Mar 2014 18:24
URI: http://eprints.soton.ac.uk/id/eprint/39278

Available Versions of this Item

Actions (login required)

View Item View Item

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics