The effect of intermetallics on the fracture mechanism in AlSi1MgMn alloy

• Autorzy: Mrówka-Nowotnik G.
• Języki publikacji: EN

Abstrakty

EN

Purpose: Fracture toughness in aluminium alloys is one of the main obstacles to using these materials in widespread ways and, therefore, various aspects of fracture mode would be examined closely, pointing out the microstructure influence. In the present paper, fracture nucleation and propagation of 6082 aluminium alloy was studied. Design/methodology/approach: Tensile tests, crack resistance test and tensile test in the presence of sharp notch in room temperature tests were executed on the samples in the peak aged condition. The microstructure of tested samples was evaluated in terms of fracture mechanism using an optical microscope-Nikon 300, scanning electron microscope HITACHI S-3400 (SEM) in a conventional back-scattered electron mode and JEOL-JEM 2100 ARP TEM/STEM electron microscope. Findings: Nucleation of voids is heterogeneous and most likely occurs by the debonding of the particle matrix interfaces. Other damage modes such as fracture of the intermetallic particles has been observed. These damage modes can significantly affect a macroscopic behaviour (tensile strength, fatigue strength, fracture toughness, and so on) of the investigated aluminium alloy under carried out tests. Practical implications: In order to predict maximum ductility before fracture of the material it is required to characterize the microstructural parameters for the different mechanism of the nucleation of voids and cracking of intermetallic particles leading to final damage. The paper summarize all potential cracking modes that can occur in the aluminium alloy 6xxx type, tensile tested at room temperature using standard tensile specimens and specimens with the presence of sharp notch. This data can be used in practice for modeling many types of engineering processes. Originality/value: The damage of the 6082 aluminium alloy tested at room temperature can be clearly attributed to the following mechanisms: propagation of cracks by fracturing the intermetallic particles, crack preceded by the nucleation of voids results from debonding along β particle/matrix interfaces and α particle/matrix due to stress concentration in this region.

Słowa kluczowe

EN

metallic alloys; fracture mechanics; electron microscopy; microstructure; intermetallic phases

PL

stopy metaliczne; mechanika pękania; mikroskopia elektronowa; mikrostruktura; fazy międzymetaliczne

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2008
• Tom: Vol. 30, nr 1
• Strony: 35--42
• Opis fizyczny: Bibliogr. 28 poz., il., tab., wykr.

Twórcy

autor

Mrówka-Nowotnik G.

• Department of Materials Science, Rzeszów University of Technology, ul. W. Pola 2, 35-959 Rzeszów, Poland,

Bibliografia

• [1] L. A. Dobrzański, R. Maniara, J. H. Sokołowski, The effect of cast Al-Si-Cu alloy solidification rate on alloy thermal characteristic, Journal of Achievements in Materials and Manufacturing Engineering 17 (2006) 217-220.
• [2] G. Mrówka-Nowotnik, J. Sieniawski, Influence of the heat treatment on the microstructure and mechanical properties of 6005 and 6082 aluminium alloys, Proceedings of the 13th International Conference „Achievements in Mechanical and Materials Engineering” AMME'2005, Gliwice-Wisła, 2005, 447-450.
• [3] G. Mrówka-Nowotnik, J. Sieniawski, Influence of heat treatment on the microstructure and mechanical properties of 6005 and 6082 aluminium alloys, Journal of Materials Processing Technology 162-163 (2005) 367-372.
• [4] L. A. Dobrzański, W. Borek, R. Maniara, Influence of the crystallization condition on Al-Si-Cu casting alloys structure, Journal of Achievements in Materials and Manufacturing Engineering 18 (2006) 211-214.
• [5] G. Mrówka-Nowotnik, J. Sieniawski, M. Wierzbińska, Analysis of intermetallic particles in AlSi1MgMn aluminium alloys, Journal of Achievements in Materials and Manufacturing Engineering 20 (2007) 155-158.
• [6] G. Mrówka-Nowotnik, J. Sieniawski, M. Wierzbińska, Intermetallic phase particles in 6082 aluminium alloys, Journal of Achievements in Materials and Manufacturing Engineering 28/2 (2007) 69-76.
• [7] D. Lassance, D. Fabregue, F. Delannay, T. Pardoen, Micro-mechanics of room and high temperature fracture in 6xxx Al alloys, Progress in Materials Science 52 (2007) 62-129.
• [8] S. E. Urreta, F. Louchet, A. Ghilarducci, Fracture behaviour of an Al-Mg-Si alloy, Materials Science and Engineering A302 (2001) 300-307.
• [9] P. Neegre, D. Steglich, W. Brocks, Crack extension in aluminium welds: a numerical approach using the Gurson-Tvergaard-Needleman model, Engineering Fracture Mechanics 71 (2004) 2365-2383.
• [10] M. Wierzbińska, J. Sieniawski, Effect of morphology of eutectic silicon crystals on mechanical properties and clevage fractuce toughnessof AlSi5Cu1 alloy, Journal of Achievements in Materials and Manufacturing Engineering 14 (2006) 217-220.
• [11] L. P. Borreg, L. M. Abreu, J. M. Costa, J. M. Ferreira, Analysis of low cycle fatigue in AlMgSi aluminium alloys, Engineering Failure Analysis 11 (2004) 715-725.
• [12] G. Mrówka-Nowotnik, J. Sieniawski, A. Nowotnik, Tensile properties and fracture toughness of heat treated 6082 alloy, Journal of Achievements in Materials and Manufacturing Engineering 17 (2006) 105-108.
• [13] F. J. MacMaster, K. S. Chan, S. C. Bergsma, M. E. Kassner, Aluminium alloy 6069 part II: fracture toughness of 6061-T6 and 6069-T6, Materials Science and Engineering A289 (2000) 54-59.
• [14] Z. Kędzierski, Role of second-phase particles in the fracture of sites with narrow plastic zone, Metallurgy and Casting 117 (1998).
• [15] J. W. Wyrzykowski, E. Pleszakow, J. Sieniawski, Deformation and Fracture of Metals, WNT, Warsaw, 1999.
• [16] M. Kciuk, The structure, mechanical properties and corrosion resistance of aluminium AlMg1Si1 alloy, Journal of Achievements in Materials and Manufacturing Engineering 16 (2006) 51-56.
• [17] M. Czechowski, Fatigue life of friction stir welded Al-Mg alloys, Proceedings of the 13th International Scientific Conference „Achievements in Mechanical and Materials Engineering” AMME'2005, Gliwice-Wisła, 2005, 83-86.
• [18] R. A. Mahdavinejad, Fatigue study on the cracks of a cannon, Journal of Achievements in Materials and Manufacturing Engineering 27/1 (2008) 59-62.
• [19] L. A. Dobrzański, M. Krupiński, P. Zarychta, R. Maniara, Analysis of influence of chemical composition of Al-Si-Cu casting alloy on formation of casting defects, Journal of Achievements in Materials and Manufacturing Engineering 21/2 (2007) 53-56.
• [20] L. A. Dobrzański, R. Maniara, M. Krupiński, J. H. Sokolowski, Microstructure and mechanical properties of AC AlSi9CuX alloys, Journal of Achievements in Materials and Manufacturing Engineering 24/2 (2007) 51-54.
• [21] M. Kciuk, S. Tkaczyk, Structure, mechanical properties and corrosion resistance of AlMg5 and AlMg1Si1 alloys, Journal of Achievements in Materials and Manufacturing Engineering 21/1(2007) 39-42.
• [22] M. Kciuk, S. Tkaczyk, Structure, mechanical properties and corrosion resistance of AlMg5 alloy, Journal of Achievements in Materials and Manufacturing Engineering 17 (2007) 185-188.
• [23] R. A. Siddiqui, H. A. Abdullah, K. R. Al.-Belushi, Influence of aging parameters on the mechanical properties of 6063 aluminium alloy, Journal of Materials Processing Technology 102 (2000) 234-240.
• [24] P. Negre, D. Steglich, W. Brocks, M. Kocak, Numerical simulation of crack extension in aluminium welds, Computational Materials Science 28 (2003) 723-731.
• [25] S. Karabay, M. Zeren, M. Yilmaz, Investigation extrusion ratio effect on mechanical behaviour of extruded alloy AA-6063, Journal of Materials Processing Technology 135 (2003) 101-108.
• [26] N. K. Ramakrishna Naidu, S. Ganesh Sundara Raman, Effect of shot blasting on plain fatigue and fretting fatigue behaviour of Al-Mg-Si alloy AA6061, International Journal of Fatigue 27 (2005) 323-331.
• [27] T. Kobayashi, Strength and fracture of aluminum alloys, Materials Science and Engineering A280 (2000) 8-16.
• [28] S. P. Yuan, G. Liu, R. H. Wang, X. Pu, G.-J. Zhang, J. Suna, K.-H. Chenb, Coupling effect of multiple precipitates on the ductile fracture of aged Al-Mg-Si alloys, Scripta Materialia 57 (2007) 865-868.