Influence of the pre-deformation on precipitation in 2024 AlCuMg alloy

被引：6

作者：

Ferragut, R

Somoza, A

Tolley, A

机构：

[1] Univ Nacl Ctr Provincia Buenos Aires, IFIMAT, Tandil, Argentina

[2] Comis Invest Cient Prov Buenos Aires, Tandil, Argentina

[3] Comis Nacl Energia Atom, Ctr Atom Bariloche, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina

[4] Consejo Nacl Invest Cient & Tecn, San Carlos De Bariloche, Rio Negro, Argentina

来源：

POSITRON ANNIHILATION - ICPA-12 | 2001年 / 363-3卷

关键词：

age-hardenable alloys; Al-based alloys; precipitation; pre-deformation;

D O I：

10.4028/www.scientific.net/MSF.363-365.88

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

A study on the influence of pre-deformation on the precipitation kinetics in the 2024 AlCuMg commercial alloy, using positron annihilation lifetime spectroscopy, Vickers microhardness and transmission electron microscopy is presented. Precipitation was induced by artificial aging heat treatments at 190 degreesC in samples with four different pre-deformation degrees between 0% and 8%. Positron lifetime results show an acceleration of the aging kinetics as a consequence of pre-deformation, which is correlated with the changes in hardness. TEM characterization of the microstructure corresponding to two different thermomechanical treatments is presented. The role of the dislocations introduced by pre-deformation on the precipitation kinetics is discussed in terms of the heterogeneous precipitation on dislocations and the modifications in the bulk precipitation.

引用

页码：88 / 90

页数：3

共 17 条

[11] EDGE DISLOCATIONS IN FCC METALS - MICROSCOPIC CALCULATIONS OF CORE STRUCTURE AND POSITRON STATES IN AL AND CU [J].

HAKKINEN, H ;

MAKINEN, S ;

MANNINEN, M .

PHYSICAL REVIEW B, 1990, 41 (18) :12441-12453

[12] EFFECT OF DEFORMATION AT ELEVATED-TEMPERATURE BEFORE AGE-HARDENING ON THE MECHANICAL-PROPERTIES OF 2024 COMMERCIAL ALUMINUM-ALLOY [J].

MAZZINI, SG ;

CARETTI, JC .

SCRIPTA METALLURGICA ET MATERIALIA, 1991, 25 (08) :1987-1990

[13] The effect of deformation prior to artificial ageing on the ageing characteristics of a 7475 aluminum alloy [J].

Poole, WJ ;

Shercliff, HR .

ALUMINIUM ALLOYS: THEIR PHYSICAL AND MECHANICAL PROPERTIES, PTS 1-3, 1996, 217 :1287-1292

[14] Origin of the initial rapid age hardening in an Al-1.7 at. % Mg-1.1 at.% Cu alloy [J].

Reich, L ;

Ringer, SP ;

Hono, K .

PHILOSOPHICAL MAGAZINE LETTERS, 1999, 79 (09) :639-648

[15] Origins of hardening in aged Al-Cu-Mg-(Ag) alloys [J].

Ringer, SP ;

Sakurai, T ;

Polmear, IJ .

ACTA MATERIALIA, 1997, 45 (09) :3731-3744

[16] 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

[17]

Triftshauser W., 1985, Positron Annihilation. Proceedings of the Seventh International Conference, P874

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