Elevated Temperature Corrosion of Mechanical Properties and Fatigue Life of 7025 Aluminum Alloy

Alwan, Mohammed H.; Al-Alkawi, Hussain J.; Aziz, Ghada A.

doi:10.30684/etj.v40i1.1587

	Elevated Temperature Corrosion of Mechanical Properties and Fatigue Life of 7025 Aluminum Alloy
Engineering and Technology Journal
Article 1, Volume 40, Issue 1, 2022, Pages 1-7 PDF (591.99 K)
Document Type: Research Paper
DOI: 10.30684/etj.v40i1.1587
Authors
Mohammed H. Alwan¹; Hussain J. Al-Alkawi^* ²; Ghada A. Aziz¹
¹Electromechanical Engineering Dept., University of Technology-Iraq, Alsina’a Street, P.O. Box 10066, Baghdad, Iraq.
²Department of Aeronautical Engineering Techniques, Bilad Alrafidain University College, Diyala, Iraq.
Abstract
Aluminum alloys are widely used in aircraft industry where good corrosion resistance, light weight and high strength are the primary requirements. In the present study, attempts have been made to extend the application of mechanical and fatigue properties of AA7025 in laboratory with corrosive environment of media and combined corrosive at elevated temperature (ET) 150⁰C. The experimental results and analysis of corrosion and corrosion - elevated temperature mechanical and fatigue behavior of the samples showed that the 3.5%NaCl corrosive media and corrosion - elevated temperature (ET) greatly decrease the properties mentioned. The Ultimate Tensile Strength (UTS) and Yield stress YS of AA 7025 reduced by 5.3% and 14.83% respectively due to combine corrosion and elevated temperature but these properties reduce by 8.7% and 19.35% respectively due to combined actions corrosion (ET). The Brinell hardness also reduced by 4.2% and 11.26% due to corrosion only and corrosion and (ET). Ductility was increased by 10.5% and 16.25% for corrosion and corrosion (ET). The environment and elevated temperature – corrosion have significant effect on reduction the fatigue life and strength of AA 7025. It’s clear that the combine corrosion and (ET) combination reduce safely of the mechanical properties compared with the corrosion only and room temperature conditions.
Highlights
All mechanical and fatigue properties were reduced due to corrosion - elevated temperature interaction for AA 7025. The experimental results showed that the Ultimate Tensile Strength (UTS) and Yield stress (YS) of AA 7025 reduced by 8.7% and 19.35% respectively when subjected to tensile and corrosion - elevated temperature test. Fatigue life and strength of AA 7025 significantly reduced under the application of corrosion and elevated temperature together.
Keywords
NaCl Corrosion; Elevated temperature – corrosion; Mechanical properties; fatigue life; strength; AA 7025

References
[1] P. Hu, Q. Meng, W. Hu, F Shen, Z Zhan, L.A. Sun .A continuum damage mechanics approach coupled with an improved pit evolution for the corrosion fatigue of aluminum alloy Corros. Sci. 113, 2016, 78 – 90. [2] G. Chen. fatigue-creep interaction fracture maps and life prediction under combined fatigue -creep stress cycling. chin. J. Met. Sci. Technol, V016, 1990. [3] R. K. Mishra .Study the effect of pre-corrosion on mechanical properties and fatigue life of aluminum alloy 8011, School of Mechanical Engineering, Shri Mata Vaishno Devi University, Katra, India, 12 July ,2019. [4] S. Sarkar, P. K. Sarswat, M. L. Free. Elevated temperature corrosion resistance of additive manufactured single phase AlCoFeNiTiV0.9Sm0.1 and AlCoFeNiV0.9Sm0.1 HEAs in a simulated syngas atmosphere, Department of Materials Science and Engineering, University of Utah, 84112, Salt Lake City, USA, 19 February 2019. [5] W. Zhang, X. Song, S. Li. Tensile and fatigue behavior of corroded rebars. Constr. Build Mater 34,2012, 409 – 417. [6] R. M. Shrnoos. Design and application of corrosion fatigue and elevated temperature test rig based on electrical control circuit, MSC thesis, UOT (2020). [7] V. Chaves, G. Beretta, J. A. Balbin, A. Navarro. Fatigue life and crack growth direction in 7075 – T6 aluminum alloy specimens with a circular hole under biaxial loading. Inter. J. of fatigue, 125,2019, 222 – 226. [8] Designation: E8/E8M Standard test methods for tension testing of Metallic materialsAS.TM international ,2017. [9] [9] M. Xianggi, L. Zhouying, W. Feifei. Investigation on corrosion fatigue crack growth rate in 7075 aluminum alloy. Material and design, 51, 2012,683 – 687. [10] S. MD. Bhuiyan, M. Mutohy, T. Murail, S. lwakami. corrosion fatigue behavior of extruded magnesium alloy A261 under three different corrosive environments. Inter T. fatigue 30,2008,1765-65. [11] HP. seifert, S. Ritter, HJ. Leber. Corrosion fatigue crack growth behavior of austenitic stainless steel under light water reactor conditions. corrosion Sci, 55, 2012,61-75. [12] B. H. Mustafa AL Khafaji. Experimental and theoretical study of composite material under static and dynamic loadings with different temperature condition. PhD Thesis, University of Technology 2014.
Statistics Article View: 550 PDF Download: 550