Effect of ECAP and aging on microstructure of an Al-Cu-Mg-Si alloy

被引：2
作者：
Gazizov, M. R. [1 ]
Mironov, S. Yu. [1 ]
Holmestad, R. [2 ]
Gazizova, M. Yu. [1 ]
Kaibyshev, R. O. [1 ]
机构：
[1] Belgorod State Natl Res Univ, Belgorod, Russia
[2] Norwegian Univ Sci & Technol NTNU, Dept Phys, Trondheim, Norway
来源：
MATERIALS CHARACTERIZATION | 2024年 / 218卷
关键词：
Al-Cu-Mg-Si alloy; Thermomechanical processing; Severe plastic deformation; Mechanical properties; Microstructure; Precipitation; Electron microscopy; STRAIN-GRADIENT PLASTICITY; HALL-PETCH RELATIONSHIP; STRENGTHENING MECHANISMS; TENSILE PROPERTIES; ALUMINUM-ALLOYS; PRECIPITATION; DEFORMATION; BEHAVIOR; PHASE; STABILITY;
D O I：
10.1016/j.matchar.2024.114500
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The effect of equal-channel-angular pressing (ECAP) on the microstructure and precipitation of an Al-4.7Cu-0.74 Mg-0.51Si-0.48Mn-0.10Cr-0.09Ti-0.02Fe (all wt%) has been studied using aberration-corrected scanning transmission electron microscopy. The ECAP followed by a short-term aging provides a superior combination of strength and ductility in the present alloy. The ECAPed alloy shows a substantially different precipitation behavior in the deformation bands (DBs) compared to extended regions (ERs) during aging. The relatively coarse particles of the equilibrium 0 (Al2Cu) and (3 (Mg2Si) phases were found to form along deformation-induced grain/ subgrain boundaries within the DBs after short-term aging. In the present alloy after ECAP and aging, the phases continuously decorating dislocation lines or forming the discrete particles in the ERs are similar to those in the bulk matrix after conventional aging. The macroscopic strengths have been estimated for the ERs and DBs in the samples after ECAP and aging. The former, i.e., ERs, with predominant strengthening contributions originating from solid solution, precipitation and dislocations, is likely have a higher YS than the latter with the relatively coarse equilibrium particles and mainly strengthened by only grain boundaries and dislocations.
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页数：15
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