Corrosion fatigue characteristics of 2195-T8 Al-Li alloys in an equivalent corrosive environment of propellant

IF 5.7 2区工程技术 Q1 ENGINEERING, MECHANICAL

Engineering Failure Analysis Pub Date : 2025-07-19 DOI:10.1016/j.engfailanal.2025.109916

Biyun Ren, Gan Tian, Dejun Liu, Xinzhi Yang, Mengqing Liu, Yan Zhang

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引用次数: 0

Abstract

To investigate the corrosion-fatigue coupled fracture of Al-Li alloys used in liquid missile propellant tanks within an equivalent liquid propellant environment, and to analyze the compatibility challenges between Al-Li alloys and liquid propellants under wet, long-term storage conditions, this study focused on 2195-T8 Al-Li alloys, a new material for liquid strategic missile tanks. First, 30% HNO₃ was identified as the equivalent propellant environment, exhibiting the fastest corrosion rate and strongest corrosivity, through electrochemical tests. Then, the surface morphologies of corrosion-fatigue specimens under different stress amplitudes were comparatively analyzed. Special attention was paid to the multi-source initiation and discontinuous propagation behavior of secondary cracks and main cracks on the surface of the corrosion-fatigue specimens. The research results have significant theoretical and practical implications for advancing the understanding of Al-Li alloys damage mechanisms and integrity evaluation, and it can guide the long-term storage safety of liquid missile propellant tanks.

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2195-T8铝锂合金在推进剂等效腐蚀环境中的腐蚀疲劳特性

为了研究导弹液体推进剂燃料箱用铝锂合金在等效液体推进剂环境下的腐蚀-疲劳耦合断裂，分析铝锂合金与液体推进剂在潮湿、长期贮存条件下的相容性挑战，本研究以战略导弹液体燃料箱用新材料2195-T8铝锂合金为研究对象。首先，通过电化学测试，确定30% HNO3为等效推进剂环境，腐蚀速度最快，腐蚀性最强。然后，对比分析了不同应力幅值下腐蚀疲劳试样的表面形貌。重点研究了腐蚀疲劳试样表面次生裂纹和主裂纹的多源起裂和不连续扩展行为。研究结果对推进对铝锂合金损伤机理的认识和完整性评价具有重要的理论和实践意义，对导弹液体推进剂储罐的长期安全储存具有指导意义。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Engineering Failure Analysis 工程技术-材料科学：表征与测试

CiteScore

7.70

自引率

20.00%

发文量

956

审稿时长

47 days

期刊介绍： Engineering Failure Analysis publishes research papers describing the analysis of engineering failures and related studies. Papers relating to the structure, properties and behaviour of engineering materials are encouraged, particularly those which also involve the detailed application of materials parameters to problems in engineering structures, components and design. In addition to the area of materials engineering, the interacting fields of mechanical, manufacturing, aeronautical, civil, chemical, corrosion and design engineering are considered relevant. Activity should be directed at analysing engineering failures and carrying out research to help reduce the incidences of failures and to extend the operating horizons of engineering materials. Emphasis is placed on the mechanical properties of materials and their behaviour when influenced by structure, process and environment. Metallic, polymeric, ceramic and natural materials are all included and the application of these materials to real engineering situations should be emphasised. The use of a case-study based approach is also encouraged. Engineering Failure Analysis provides essential reference material and critical feedback into the design process thereby contributing to the prevention of engineering failures in the future. All submissions will be subject to peer review from leading experts in the field.