Vacancy-solute interaction in magnesium alloy WE54 during artificial ageing: a positron annihilation spectroscopy study

被引：2

作者：

Moia, Fabio ^{[1
,6
]}

Calloni, Alberto ^{[1
,6
]}

Ferragut, Rafael ^{[1
,6
]}

Dupasquier, Alfredo ^{[1
,6
]}

Macchi, Carlos Eugenio ^{[2
,4
]}

Somoza, Alberto ^{[3
,4
]}

Nie, Jian Feng ^{[5
]}

机构：

[1] Politecn Milan, Dipartimento Fis LNESS, I-22100 Como, CO, Italy

[2] Consejo Nacl Invest Cient & Tecn, Tandil, Argentina

[3] CICPBA, Tandil, Argentina

[4] UNCtr, IFIMAT, Tandil, Argentina

[5] Monash Univ, Dept Mat Engn, Clayton, Vic 3800, Australia

[6] Politecn Milan, CNISM, I-22100 Como, CO, Italy

来源：

INTERNATIONAL JOURNAL OF MATERIALS RESEARCH | 2009年 / 100卷 / 03期

关键词：

Magnesium alloys; Rare-earth; Precipitation; Positron spectroscopies; PRECIPITATION;

D O I：

10.3139/146.110036

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The vacancy-solute interaction during artificial ageing at 250 degrees C was studied in the commercial alloy WE54 by coincidence Doppler broadening of the positron annihilation radiation. The results show that in the initial state of ageing positron trapping is weak. Under these conditions, the faint signal comes predominantly from small Zr particles, with minor contributions from vacancy-Nd complexes. Positron trapping increases concomitantly with the formation of the beta'- and beta(1)-phases at the onset of precipitation hardening, and becomes very intense at later ageing stages when the beta(1)-phase is formed. The chemical composition in contact with open-volume defects changes after 4 h of ageing with a progressive enrichment in Mg, concomitant with a hardness increase. There is evidence for a prevalence of Nd over Y up to 24 h of ageing and then a prevalence of Y over Nd for 96 h (Y/Nd approximate to 3) when the beta-phase is dominant.

引用

页码：378 / 381

页数：4

共 12 条

[1]

[Anonymous], 2006, LIGHT ALLOYS TRADITI

[2] Early stages of precipitation and microstructure control in Mg-rare earth alloys [J].

Antion, C. ;

Donnadieu, P. ;

Tassin, C. ;

Pisch, A. .

PHILOSOPHICAL MAGAZINE, 2006, 86 (19) :2797-2810

[3] Hardening precipitation in a Mg-4Y-3RE alloy [J].

Antion, C ;

Donnadieu, P ;

Perrard, F ;

Deschamps, A ;

Tassin, C ;

Pisch, A .

ACTA MATERIALIA, 2003, 51 (18) :5335-5348

[4] 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

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

Dupasquier, A ;

Kögel, G ;

Somoza, A .

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

[6]

Emley E.F., 1966, PRINCIPLES MAGNESIUM

[7] Age-hardening in a commercial Mg-based alloy [J].

Macchi, C. E. ;

Somoza, A. ;

Nie, J. F. .

PHYSICA STATUS SOLIDI C - CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 4, NO 10, 2007, 4 (10) :3538-+

[8] Structure evolution of a WE43 Mg alloy submitted to different thermal treatments [J].

Mengucci, P. ;

Barucca, G. ;

Riontino, G. ;

Lussana, D. ;

Massazza, M. ;

Ferragut, R. ;

Aly, E. Hassan .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2008, 479 (1-2) :37-44

[9] Precipitation in magnesium alloy WE54 during isothermal ageing at 250°C [J].

Nie, JF ;

Muddle, BC .

SCRIPTA MATERIALIA, 1999, 40 (10) :1089-1094

[10] Characterisation of strengthening precipitate phases in a Mg-Y-Nd alloy [J].

Nie, JF ;

Muddle, BC .

ACTA MATERIALIA, 2000, 48 (08) :1691-1703

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