Effects of Stabilizing Annealing Temperature on Microstructure and Properties of Cold-Rolled 5059 Aluminum Alloy Plate

doi:10.12068/j.issn.1005-3026.2024.03.003

Abstract

Abstract:

The cold‐rolled 5059 aluminum alloy plate was annealed at different temperatures

（125～275 ℃） for 1 h， and the effects of stabilizing annealing temperature on the microstructure and properties of the plate were studied. The results showed that shear bands passing through multiple fibrous grains were formed in the deformed microsturcture of the cold‐rolled plate with deformation 62.8%. After annealing at different temperatures （150~225 ℃） for 1 h， theβ phase was precipitated continuously along the shear bands， leading to the formation of corrosion grooves during intergranular corrosion processes. As the annealing temperature increased from 125 ℃ to 275 ℃， the yield strength and tensile strength of the 5059 plate decreased from 386 and 474 MPa to 301 and 407 MPa， respectively， while the elongation increased from 10.4% to 18.1%. The corrosion amount per unit area of 5059 aluminum alloy cold‐rolled plates increased from 13.7 mg/cm² of 125 ℃×1 h annealed plate to 53.8 mg/cm² of 200 ℃×1 h， and then gradually decreased to 4.9 mg/cm² of 275 ℃×1 h annealed plate.

Key words: 5059 aluminum alloy, rolling, stabilization annealing, intergranular corrosion, tensile property

CLC Number:

TG 166.3

Qing-feng ZHU, Jian-hang HUANG, Yang GAO, En-ge ZHANG. Effects of Stabilizing Annealing Temperature on Microstructure and Properties of Cold-Rolled 5059 Aluminum Alloy Plate[J]. Journal of Northeastern University(Natural Science), 2024, 45(3): 323-330.

Figures/Tables 8

Table 1 Composition of 5059 aluminum alloy （mass fraction）

Mg	Mn	Zn	Ti	Zr	Fe	Si
5.05	1.00	0.52	0.14	0.10	0.10	0.06

Fig.1 The sample dimension for tensile test （unit：mm）

Fig.2 Microstructure of the cold‐rolled plate after annealing at different temperatures for 1 h under polarized light

Fig.3 Microstructure of the cold‐rolled plates annealed at different temperatures after corrosion by Keller reagent

Fig.4 Tensile properties of the plate after annealing at different temperatures

Fig.5 Weight loss per unit area after annealing at different temperatures for 1 h

Fig.6 L‐S surface corrosion morphology of the plate annealed at different temperatures for 1 h

Fig.7 SEM images of L‐S surface at different annealing temperatures atter corrosion of the sample

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