Oxidation Behavior of T6-treated Al-5Zn-2Mg Al-alloy in Air at 400 oC and 550 oC

doi:10.11901/1005.3093.2024.489

Chinese Journal of Materials Research

2025, Vol. 39

Issue (11): 824-836 DOI: 10.11901/1005.3093.2024.489

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Oxidation Behavior of T6-treated Al-5Zn-2Mg Al-alloy in Air at 400 ^oC and 550 ^oC

LU Cuilan¹^,², XU Daokui¹^,²(

), WANG Dongliang¹^,², XU Xiangbo¹^,², LV Xin¹^,²

^1.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
^2.School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China

Cite this article:

LU Cuilan, XU Daokui, WANG Dongliang, XU Xiangbo, LV Xin. Oxidation Behavior of T6-treated Al-5Zn-2Mg Al-alloy in Air at 400 ^oC and 550 ^oC. Chinese Journal of Materials Research, 2025, 39(11): 824-836.

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Abstract

The oxidation behavior of the T6-treated Al-5Zn-2Mg (in mass fraction) Al-alloy in air at 400 ^oC and 550 ^oC for 0 h to 384 h is comparatively studied via intermittent weighing, SEM+EDS and XRD etc. The results show that the alloy is mainly composed of Al-matrix with η' phase, η phase and Fe-containing phase. Among them, the η' phase is dispersed within grains, the η phase is preferentially distributed along grain boundaries, and the Fe-containing phase is mainly banded along the extrusion direction (ED). During oxidation at 400 ^oC, the alloy exhibits good resistance to high temperature oxidation. Within the range of 0 h to 192 h, it shows a slight increase in mass. From 192 h to 384 h, the mass increase does not change significantly with time. After oxidation for 384 h, the mass increase is only 0.07 mg/cm². Upon oxidation at 550 ^oC, the mass of the alloy increases significantly with the extension of time. After oxidation for 384 h, its mass increased by 0.33 mg/cm². Besides, failure analysis shows that the surface morphology of the alloy remained basically unchanged after oxidation at 400 ^oC and no O enrichment was observed on the surface. However, after oxidation at 550 ^oC, the surface of the alloy turned gray-black, implying the occurrence of significant oxidation in the Fe-containing adjacent regions and its vicinity, resulting in the enrichment of Mg and O there.

Key words: metallic materials oxidation resistance high temperature oxidation treatment microstructure oxidation kinetics oxide film morphology

Received: 11 December 2024

ZTFLH:

TG172

Fund: National Natural Science Foundation of China(U21A2049);National Natural Science Foundation of China(52071220);National Natural Science Foundation of China(51971054)

Corresponding Authors: XU Daokui, Tel: (024)23915897, E-mail: dkxu@imr.ac.cn

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	LU Cuilan
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	WANG Dongliang
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	LV Xin

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https://www.cjmr.org/EN/10.11901/1005.3093.2024.489 OR https://www.cjmr.org/EN/Y2025/V39/I11/824

Fig.1 Surface BSE morphology of the T6-treated Al-5Zn-2Mg aluminum alloy (a) and EDS surface scan corresponding to amplification region (b)

Fig.2 XRD pattern of the T6-treated Al-5Zn-2Mg aluminum alloy

Fig.3 High-power SEM (a) and TEM (b) morphology of the T6-treated Al-5Zn-2Mg aluminum alloy

Fig.4 Variation trend of high-temperature oxidation mass gain of the T6-treated Al-5Zn-2Mg aluminum alloy at 400 ^oC and 500 ^oC

Fig.5 High-power optical morphologies of the T6-treated Al-5Zn-2Mg aluminum alloy surface after oxidation at 400 ^oC for 0 h (a), 48 h (b), 96 h (c), 192 h (d), 288 h (e) and 384 h (f)

Fig.6 High-power optical morphologies of the T6-treated Al-5Zn-2Mg aluminum alloy surface after oxidation at 550 ^oC for 0 h (a), 48 h (b), 96 h (c), 192 h (d), 288 h (e) and 384 h (f)

Fig.7 Variation trend of surface height of the T6-treated Al-5Zn-2Mg aluminum alloy after high-temperature oxidation at 400 ^oC and 550 ^oC

Fig.8 SE morphologies of oxidation surface of the T6-treated Al-5Zn-2Mg aluminum alloy at 400 ^oC (a, c, e, g) and 550 ^oC (b, d, f, h) for 0 h (a, b), 48 h (c, d), 96 h (e, f) and 288 h (g, h)

Table 1 EDS data of the T6-treated Al-5Zn-2Mg aluminum alloy at high temperature oxidation (mass fraction, %)

Fig.9 SE (a) and BSE (b) morphologies of oxidation surface of the T6-treated Al-5Zn-2Mg aluminum alloy after oxidation at 400 ^oC for 288 h, and EDS scanning distribution of elements Al (c), Fe (d), Mn (e), Si (f), Mg (g) and O (h)

Fig.10 SE (a) and BSE (b) morphologies of oxidation surface of the T6-treated Al-5Zn-2Mg aluminum alloy after oxidation at 550 ^oC for 288 h, and EDS scanning distribution of elements Al (c), Fe (d), Mn (e), Si (f), Mg (g) and O (h)

Fig.11 Cross-sectional morphologies (a, b) and EDS mapping of Al (c, d), Mg (e, f), O (g, h) elements of the T6-treated Al-5Zn-2Mg aluminum alloy after oxidation at 400 ^oC (a, c, e, g) and 550 ^oC (b, d, f, h)

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