Positron lifetime evolution during room temperature ageing in Al-Zn-Mg-(Cu)

被引：3

作者：

Dupasquier, A. ^{[1
]}

Ferragut, R. ^{[1
]}

Liddicoat, P. ^{[2
,3
]}

Moja, F. ^{[1
]}

Ringer, S. P. ^{[2
,3
]}

机构：

[1] Politecn Milan, LNESS, Dept Phys, Via Anzani 42, I-22100 Como, Italy

[2] Univ Sydney, Australian Key Ctr Microscopy & Microanal, Sydney, NSW 2006, Australia

[3] Univ Sydney, ARC Ctr Excellence Design Light Met, Sydney, NSW 2006, Australia

来源：

PHYSICA STATUS SOLIDI C - CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 6, NO 11 | 2009年 / 6卷 / 11期

关键词：

ALLOYS; ANNIHILATION; MG;

D O I：

10.1002/pssc.200982068

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The effect on the formation of vacancy-solute clusters by the addition of small percentages of Cu to Al-Zn-Mg has been studied by positron annihilation lifetime spectroscopy. The results document the ability of Cu to increase the number of vacancies retained after quenching, by forming an additional population of vacancy-solute clusters in competition with pure Zn clusters. It has also been shown that Cu accelerates the decomposition of the alloy at 150 degrees, thereby leaving a reduced supersaturation of the matrix after an early interruption. An unexpected result is that the curve positron lifetime vs, ageing time at RT displays the symptoms of a change in the nature of the coherent aggregates that occurs in about 10 hours of RT exposure. (C) 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

引用

页码：2301 / +

页数：2

共 8 条

[1]

DIX EH, 1950, T AM SOC METAL, V42, P1057

[2] Hardening nanostructures in an AlZnMg alloy [J].

Dupasquier, A. ;

Ferragut, R. ;

Iglesias, M. M. ;

Massazza, M. ;

Riontino, G. ;

Mengucci, P. ;

Barucca, G. ;

Macchi, C. E. ;

Somoza, A. .

PHILOSOPHICAL MAGAZINE, 2007, 87 (22) :3297-3323

[3] Studies of light alloys by positron annihilation techniques [J].

Dupasquier, A ;

Kögel, G ;

Somoza, A .

ACTA MATERIALIA, 2004, 52 (16) :4707-4726

[4]

Dupasquier A., 2004, Mater Forum, V28, P1135

[5] Evolution of nanostructure during the early stages of ageing in Al-Zn-Mg-Cu alloys [J].

Liddicoat, P. V. ;

Honma, T. ;

Stephenson, L. T. ;

Ringer, S. P. .

ALUMINIUM ALLOYS 2006, PTS 1 AND 2: RESEARCH THROUGH INNOVATION AND TECHNOLOGY, 2006, 519-521 :555-560

[6]

LIDDICOAT PV, 2008, ALUMINIUM ALLOYS THE

[7] Secondary precipitation in Al-Zn-Mg-(Ag) alloys [J].

Macchi, CE ;

Somoza, A ;

Dupasquier, A ;

Polmear, IJ .

ACTA MATERIALIA, 2003, 51 (17) :5151-5158

[8] Positron-annihilation study of the aging kinetics of AlCu-based alloys. I. Al-Cu-Mg [J].

Somoza, A ;

Dupasquier, A ;

Polmear, IJ ;

Folegati, P ;

Ferragut, R .

PHYSICAL REVIEW B, 2000, 61 (21) :14454-14463

← 1 →