PL EN


Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników
Tytuł artykułu

The effect of annealing and anisotropic behaviour on tensile and fatigue properties of AA 8090

Treść / Zawartość
Identyfikatory
Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
Purpose: This paper aims to assess microstructures and mechanical properties of annealed and un-annealed Al-Li alloys (AA8090) and provide valid information regarding influence of anisotropy on tensile properties, fatigue lives. Design/methodology/approach: The methodology included investigating the influence of annealing on grain size, tensile strength and fatigue lives of AA8090. Optical microscope, scanning electron microscope and X-ray diffraction were utilized to analyse the crystallographic texture. Findings: The results showed that the un-annealed alloy exhibited much finer grain structure in three directions, namely longitudinal (L) rolling direction, L-45° and Long transverse (LT) combined with stronger crystallographic texture. Regarding to mechanical properties, un-annealed alloy presented superior tensile strength with strong anisotropic behaviour. L and LT grains direction showed highest tensile strength value of 550 MPa and L-45° showed lowest tensile strength value of 420 MPa. Results of fatigue test revealed that annealed Al-Li alloy has lower fatigue lives with high influence of test direction on fatigue properties. Higher variation in fatigue life to failure links with un-annealed alloy over annealed alloy. Examination of fractured surface showed that the morphology of fractured surface is a mixture of ductile and brittle fractures in both annealed and un-annealed alloys with more brittle behaviour in un-annealed alloy. Research limitations/implications: The main challenge of this work is the determination of the test direction (test angle in respect to rolling direction), which is necessary to provide correct information regarding mechanical properties. Further study of low cycle fatigue can be done in future, which will be an excellent indication to mechanical properties of this alloy since it provides more understanding to the behaviour of the material and better comprehend crack propagation and strain stress concentration. Practical implications: AA8090 alloy is an important candidate for aerospace and aircraft industries. Influence of annealing heat treatment and rolling direction on mechanical properties of AA8090 alloy provides more accurate information to the manufacturers who deal with this alloy. Originality/value: This study is affording a significant information regarding the effect of annealing and anisotropic behaviour on mechanical properties of AA8090. To our knowledge, there are few reports that study this combination of factors on AA8090 alloy.
Rocznik
Strony
5--12
Opis fizyczny
Bibliogr. 15 poz.
Twórcy
autor
  • Ministry of Oil, Midland Oil Company, Iraq
autor
  • Technical Engineering College of Sulimania, Iraq
autor
autor
  • Middle Technical University, Iraq
Bibliografia
  • [1] C. Gonzalez, A. Martín, J. Llorca, Effect of temperature on the fracture mechanisms of 8090 Al-Li alloy and 8090 Al-Li/SiC composite, Scripta Materialia 51/11 (2004) 1111-1115, DOI: https://doi.org/10.1016/j.scriptamat.2004.07.025.
  • [2] L. Bonaccorsi, G. Costanza, S. Missori, A. Sili, M. Tata, Mechanical and metallurgical characterization of 8090 Al-Li alloy welded joints, Metallurgist 56/1-2 (2012) 75-84, DOI: https://doi.org/10.1007/s11015-012-9539-2.
  • [3] N.E. Prasad, A. Gokhale, P.R. Rao, Mechanical behaviour of aluminium-lithium alloys, Sadhana 28/1-2 (2003) 209-246, DOI: https://doi.org/ 10.1007/BF02717134.
  • [4] Z. Burzic, S. Sedmak, S. Maksimovic, N. Grahovac, J. Curovic, V. Stefanovic, Fracture toughness and fatigue crack propagation behavior of Al-Li 8090 alloy, Materials Science 31/1 (1996) 39-53, DOI: https://doi.org/10.1007/BF00565974.
  • [5] A.A. El-Aty, Y. Xu, X. Guo, S. Zhang, Y. Ma, D. Chen, Strengthening mechanisms, deformation behavior, and anisotropic mechanical properties of Al-Li alloys: a review, Journal of Advanced Research 10 (2018) 49-67, DOI: https://doi.org/10.1016/ j.jare.2017.12.004.
  • [6] K. Jata, A. Singh, Chapter 5 – Texture and its effects on properties in Aluminum–Lithium alloys, in: N. Eswara Prasad, A.A. Gokhale, R.J.H. Wanhill (Eds.), Aluminum-lithium alloys. Processing, Properties, and Applications, Elsevier, 2014, pp. 139-163, DOI: https://doi.org/10.1016/B978-0-12-401698-9.00005-7.
  • [7] N. Eswara Prasad, In-plane anisotropy in the fatigue and fracture properties of quaternary Al-Li-Cu-Mg alloys, Doctoral Thesis, Banaras Hindu University, Varanasi, 1993.
  • [8] K. Jata, A. Hopkins, R. Rioja, The anisotropy and texture of Al-Li alloys, Materials Science Forum 217- 222 (1996) 647-652, DOI: https://doi.org/10.4028/www.scientific.net/MSF.217-222.647.
  • [9] S. Lynch, A. Wilson, R. Byrnes, Effects of ageing treatments on resistance to intergranular fracture of 8090 Al-Li alloy plate, Materials Science and Engineering: A 172/1-2 (1993) 79-93, DOI: https://doi.org/10.1016/0921-5093(93)90428-H.
  • [10] Y. Xu, L. Wang, Y. Zhang, Z. Wang, Q. Hu, Fatigue and fracture behavior of an aluminum-lithium alloy 8090-t6 at ambient and cryogenic temperature, Metallurgical Transactions A 22/3 (1991) 723-729, DOI: https://doi.org/10.1007/BF02670295.
  • [11] A.A. Gokhale, V. Singh, Effect of Zr content and mechanical working on the structure and tensile properties of AA8090 alloy plates, Journal of Materials Processing Technology 159/3 (2005) 369-376, DOI: https://doi.org/10.1016/j.jmatprotec. 2004.01.062.
  • [12] A. Singh, A. Gokhale, G. Saha, R. Ray, Texture evolution and anisotropy in Al–Li–Cu–Mg alloys, in: R.K. Ray, A.K. Singh (Eds.), Textures in materials research, Science Publishers, U.S., 1999, 219-234.
  • [13] M. Pedemonte, C. Gambaro, E. Lertora, C. Mandolfino, Fatigue assessment of AA8090 friction stir butt welds after surface finishing treatment, Aerospace Science and Technology 27/1 (2013) 188- 192, DOI: https://doi.org/10.1016/j.ast.2012.08.006.
  • [14] S.H. Park, S.-G. Hong, W. Bang, C.S. Lee, Effect of anisotropy on the low-cycle fatigue behavior of rolled AZ31 magnesium alloy, Materials Science and Engineering: A 527/3 (2010) 417-423, DOI: https://doi.org/10.1016/j.msea.2009.08.044.
  • [15] J.J. Rino, B.S. Prabu, K. Padmanabhan, On the influence of repetitive corrugation and straightening on the microstructure and mechanical properties of AA8090 Al-Li alloy, Archives of Civil and Mechanical Engineering 18/1 (2018) 280-290, DOI: https://doi.org/10.1016/j.acme.2017.07.006.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-bb9db936-60a7-4241-b83e-024613e11457
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.