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
Contact Email Address: m.j.starink@soton.ac.uk
URI: http://eprints.soton.ac.uk/id/eprint/39278

Available Versions of this Item

Actions (login required)

View Item View Item