<strong>T6</strong>态<strong>Al-5Zn-2Mg</strong>铝合金的高温氧化行为及其机制

doi:10.11901/1005.3093.2024.489

材料研究学报

2025, Vol. 39

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

研究论文

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T6态Al-5Zn-2Mg铝合金的高温氧化行为及其机制

卢翠兰¹^,², 许道奎¹^,²(

), 王东亮¹^,², 徐祥博¹^,², 吕鑫¹^,²

^1.中国科学院金属研究所沈阳 110016
^2.中国科学技术大学材料科学与工程学院沈阳 110016

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

引用本文:

卢翠兰, 许道奎, 王东亮, 徐祥博, 吕鑫. T6态Al-5Zn-2Mg铝合金的高温氧化行为及其机制[J]. 材料研究学报, 2025, 39(11): 824-836.
Cuilan LU, Daokui XU, Dongliang WANG, Xiangbo XU, Xin LV. Oxidation Behavior of T6-treated Al-5Zn-2Mg Al-alloy in Air at 400 ^oC and 550 ^oC[J]. Chinese Journal of Materials Research, 2025, 39(11): 824-836.

全文: PDF(38303 KB) HTML

摘要:

研究了T6态Al-5Zn-2Mg(质量分数，%)铝合金在400 ℃和550 ℃氧化0~384 h的氧化行为。结果表明，T6态Al-5Zn-2Mg合金主要有η'相、η相、含Fe相和Al基体。η'相在晶内弥散分布，η相择优分布在晶界，含Fe相沿挤压方向(ED)呈条带状分布。在400 ℃氧化，合金的抗高温氧化性能良好。氧化0~92 h的合金，其质量微弱增加。氧化192~384 h，合金的增重不随时间的延长而改变。氧化384 h，合金的氧化增重只有0.07 mg/cm²。在550 ℃氧化，合金的增重随着氧化时间的延长显著提高。氧化384 h，合金的氧化增重为0.33 mg/cm²。合金在400 ℃氧化后其表面形貌基本不变且没有出现O元素富集。但是，在550 ℃氧化后合金的表面变成灰黑色，且在含Fe相处及其近邻区域发生了显著的氧化损伤，致使Mg和O元素富集。

关键词 ：金属材料, 抗氧化行为, 高温氧化处理, 微观组织, 氧化动力学, 氧化膜形貌

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

收稿日期: 2024-12-11

ZTFLH:

TG172

基金资助:国家自然科学基金(U21A2049);国家自然科学基金(52071220);国家自然科学基金(51971054)

通讯作者: 许道奎，研究员，dkxu@imr.ac.cn，研究方向为轻质合金的使役行为及其性能提高方法

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

作者简介: 卢翠兰，女，1998年生，硕士

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https://www.cjmr.org/CN/10.11901/1005.3093.2024.489 或 https://www.cjmr.org/CN/Y2025/V39/I11/824

图1 T6态Al-5Zn-2Mg铝合金表面的BSE形貌和放大区域对应的EDS面扫

图2 T6态Al-5Zn-2Mg铝合金的XRD谱

图3 T6态Al-5Zn-2Mg铝合金的高倍SEM和TEM形貌

图4 T6态Al-5Zn-2Mg铝合金在400 ℃和500 ℃的高温氧化增重变化趋势

图5 T6态Al-5Zn-2Mg铝合金在400 ℃氧化不同时间后表面的形貌

图6 T6态Al-5Zn-2Mg铝合金在550 ℃氧化不同时间后表面的形貌

图7 T6态Al-5Zn-2Mg铝合金在400 ℃和550 ℃高温氧化后表面高度的变化趋势

图8 T6态Al-5Zn-2Mg铝合金在400 ℃和550 ℃氧化不同时间后表面的二次电子形貌

表1 T6态Al-5Zn-2Mg铝合金的高温氧化EDS数据

图9 T6态Al-5Zn-2Mg铝合金在400 ℃氧化288 h后的表面SE和BSE形貌以及EDS面扫结果

图10 T6态Al-5Zn-2Mg铝合金在550 ℃氧化288 h后的表面SE和BSE形貌以及EDS面扫结果

图11 T6态Al-5Zn-2Mg铝合金在不同温度氧化后的截面SEM形貌和面扫分布

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