5A90铝锂合金显微组织及海洋大气环境腐蚀行为

doi:10.11902/1005.4537.2015.201

中国腐蚀与防护学报

2016, Vol. 36

Issue (3): 260-266 DOI: 10.11902/1005.4537.2015.201

研究报告

本期目录 | 过刊浏览

5A90铝锂合金显微组织及海洋大气环境腐蚀行为

苏艳(

),张伦武,钟勇

中国兵器工业第五九研究所重庆 400039

Marine Atmospheric Corrosion Behavior of 5A90 Al-Li Alloy

Yan SU(

),Lunwu ZHANG,Yong ZHONG

No. 59 Institute of China Ordnance Industry, Chongqing 400039, China

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摘要:

采用海洋大气环境暴露实验以及XRD,OM和SEM等分析手段,对比研究了5A90铝锂合金和2D12铝合金的显微组织、腐蚀行为和力学性能,探讨了腐蚀机制。结果表明,5A90铝锂合金的主要强化相为δ ′ (Al₃Li) 和T(Al₂MgLi),细密析出呈弥散分布,其微观腐蚀形貌与2D12铝合金存在明显区别,即晶界和晶粒内部同时发生腐蚀,晶间腐蚀特征不明显。用腐蚀失重表征铝合金腐蚀损伤程度,5A90合金腐蚀过程不符合幂函数规律,腐蚀造成的力学损伤明显大于2D12合金的。5A90合金的原始断裂方式以撕裂和韧窝为主,环境腐蚀作用促进合金由韧性断裂向沿晶脆性断裂的转变,严重降低材料塑性。

关键词 ：铝锂合金, 显微组织, 腐蚀行为, 自然环境实验

Abstract：

The microstructure, corrosion behavior and the influence of corrosion on mechanical performance of 5A90 Al-Li alloy and 2D12 alloy were studied comparatively by means of X-ray diffraction, metallurgical analysis, scanning electron microscopy and marine atmospheric exposure test, while the relevant corrosion mechanism was also discussed. The results showed that the strengthening phases δ ′-Al₃Li and T-Al₂MgLi of 5A90 Al-Li alloy are fine and dispersed quite uniformly. 5A90 Al-Li alloy showed corrosion characteristics in micro-scale apparently different from 2D12 alloy, i.e. the corrosion of the former occurred simultaneously at grain boundaries and in grains. The corrosion process of 5A90 Al-Li alloy did not follow the power function in terms of corrosion mass loss. The mechanical performance degradation of 5A90 Al-Li alloy due to corrosion is apparently faster than that of 2D12 alloy. The fracture manner of 5A90 Al-Li alloy is mainly dimple fracture, while the environmental corrosion promotes the transition from ductile fracture to intergranular brittle fracture.

Key words： Al-Li alloy microstructure corrosion behavior natural environmental test

收稿日期: 2015-11-13

基金资助:技术基础科研计划项目 (JSHS2015209C002) 资助

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引用本文:

苏艳,张伦武,钟勇. 5A90铝锂合金显微组织及海洋大气环境腐蚀行为[J]. 中国腐蚀与防护学报, 2016, 36(3): 260-266.
Yan SU, Lunwu ZHANG, Yong ZHONG. Marine Atmospheric Corrosion Behavior of 5A90 Al-Li Alloy. Journal of Chinese Society for Corrosion and protection, 2016, 36(3): 260-266.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2015.201 或 https://www.jcscp.org/CN/Y2016/V36/I3/260

表1 5A90铝锂合金和2D12铝合金的化学成分

图1 5A90-T3和2D12-T4合金的显微组织

图2 5A90铝锂合金的XRD谱

图3 5A90铝锂合金海洋大气环境暴露不同时间后的表面形貌

表2 5A90和2D12合金的平均腐蚀速率

图4 5A90和2D12合金腐蚀深度拟合曲线

图5 5A90和2D12合金暴露不同时间的腐蚀截面

图6 5A90铝锂合金腐蚀截面SEM像

图7 5A90和2D12合金的拉伸性能趋势图

图8 5A90铝锂合金拉伸断口SEM像

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