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Precipitation behavior in the early stage of aging in an Al–Li°Cu–Mg–Zr–Ag (Weldalite 049) alloy

Published online by Cambridge University Press:  31 January 2011

Kap Ho Lee ,
Yeung Jo Lee  and
Kenji Hiraga
Kap Ho Lee
Affiliation:
Department of Metallurgical Engineering, Chungnam National University, Taejon 305-764, Korea
Yeung Jo Lee
Affiliation:
Propulsion Department, Agency for Defence Development, Yusung P.O. Box 35-4, Taejon, Korea
Kenji Hiraga
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
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Abstract

The precipitation behavior of various phases during the aging process of an Ag–Li°Cu–Mg–Zr–Ag (Weldalite 049) alloy was investigated by high-resolution electron microscopy and in situ hot-stage microscopy. Two kinds of domains with L12-type ordered structures, which are considered to be δ′ and β′ phases, are observed with different domain sizes in the alloy quenched from 530 °C. In the early stage of aging at 190 °C, the δ′ phase is precipitated as surrounding the β' phase, and the δ′ domains appear with in-phase and antiphase relationships to the β′ lattices. In situ observations at 190 °C clearly show that the T1 phase precipitates predominantly on dislocations at subgrain boundaries and then is homogeneously formed in the matrix with increasing aging time. The nucleation of the S′ phase is associated with clustering of Cu and Mg in the matrix, and the S0 domains are grown with {210} habit planes.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 2 , February 1999 , pp. 384 - 389
Copyright
Copyright © Materials Research Society 1999

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