Effects of Cu Addition on Behavior of Nanoclusters during Multi-Step Aging in Al-Mg-Si Alloys

被引：51

作者：

Kim, JaeHwang ^{[1
]}

Kobayashi, Equo ^{[1
]}

Sato, Tatsuo ^{[1
]}

机构：

[1] Tokyo Inst Technol, Dept Met & Ceram Sci, Tokyo 1528552, Japan

来源：

MATERIALS TRANSACTIONS | 2011年 / 52卷 / 05期

关键词：

aluminum-magnesium-silicon alloy; age hardening; nanocluster; copper addition; multi-step aging; THERMAL-STABILITY; 1ST-PRINCIPLES; PRECIPITATION; ENERGIES;

D O I：

10.2320/matertrans.L-MZ201121

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Two types of nanoclusters, i.e. Cluster (1) and Cluster (2), play a strongly important role in the bake-hardening (BH) response in Al-Mg-Si alloys. Different formation behaviors of two types of nanoclusters were studied by means of hardness, differential scanning calorimetry (DSC), electrical resistivity measurement, transmission electron microscopy (TEM) and high resolution TEM observation in the both Cu-free and Cu-added Al-Mg-Si alloys. As the results, Cluster (1) formed during natural aging at room temperature causes a deleterious effect, whereas Cluster (2) formed by the pre-aging at 100 degrees C is effective for the suppression of the negative effect on the two-step aging behavior of the both Cu-free and Cu-added alloys. On the other hand, the microalloying of Cu strongly affects the nanocluster formation due to the strong interaction with Mg, Si atoms and vacancies. The first-principle calculation for the two-body interaction energies provides quite useful information to understand the early stage of the phase decomposition. The effects of nanoclusters and the Cu addition on the age-hardening behaviors of Al-Mg-Si alloys are discussed based on the multi-step age-hardening phenomena. [doi:10.2320/matertrans.L-MZ201121]

引用

页码：906 / 913

页数：8

共 19 条

[11]

Matsuda K., 2001, METALL MATER TRANS A, V47, P833

[12]

Miao M. F., 2000, MAT T A, V31A, P361

[13] Precipitation hardening in aluminum alloy 6022 [J].

Miao, WF ;

Laughlin, DE .

SCRIPTA MATERIALIA, 1999, 40 (07) :873-878

[14] RESISTIVITY MAXIMUM DURING GUINIER-PRESTON ZONE FORMATION IN A1-ZN ALLOYS [J].

OSAMURA, K ;

HIRAOKA, Y ;

MURAKAMI, Y .

PHILOSOPHICAL MAGAZINE, 1973, 28 (04) :809-825

[15] First-principles study of crystal structure and stability of Al-Mg-Si-(Cu) precipitates [J].

Ravi, C ;

Wolverton, C .

ACTA MATERIALIA, 2004, 52 (14) :4213-4227

[16] Roles of microalloying elements on the cluster formation in the initial stage of phase decomposition of Al-based alloys [J].

Sato, T ;

Hirosawa, S ;

Hirose, K ;

Maeguchi, T .

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 2003, 34A (12) :2745-2755

[17] Three-dimensional atom probe characterization of nanoclusters responsible for multistep aging behavior of an Al-Mg-Si alloy [J].

Serizawa, A. ;

Hirosawa, S. ;

Sato, T. .

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 2008, 39A (02) :243-251

[18] 3DAP Characterization and thermal stability of nano-scale clusters in Al-Mg-Si alloys [J].

Serizawa, Ai ;

Hirosawa, Shoichi ;

Sato, Tatsuo .

ALUMINIUM ALLOYS 2006, PTS 1 AND 2: RESEARCH THROUGH INNOVATION AND TECHNOLOGY, 2006, 519-521 :245-250

[19] Effects of quenching conditions on two-step aging behavior of Al-Mg-Si alloys [J].

Yamada, K ;

Sato, T ;

Kamio, A .

ALUMINIUM ALLOYS: THEIR PHYSICAL AND MECHANICAL PROPERTIES, PTS 1-3, 2000, 331-3 :669-674

← 1 2 →