Abstract
Impact strength is one of the major mechanical properties that a material should possess in order to absorb sudden changes in the load intensity. The objective of current study is to compare the impact strength of two material (AU5GT and AS7G06), which are used in different structural applications. Almost no work is available which compares the impact strength of selected grade alloys along with different heat treatment cycles. Specimens are heat treated first as per designed cycles, later impact testing is performed. Charpy impact test is conducted in accordance with ASTM E23-12 standard method on three samples with and without heat treatment for each cycle. Solutionizing on samples is done at constant time and temperature to achieve homogenization. Later, aging is conducted at different temperatures ranging from 100-200°C (different intervals) at constant time to find the effect of precipitation hardness that actually increases the strength. Sample hardness is determined using Vickers micro hardness testing machine for each heat treatment cycle. Charpy test results provided the impact energy that is used to determine the strength before fracture. Heat treated samples have showed increase in impact strength for AS7G06 aluminum alloy while AU5GT shows very little change. This is because of growing the precipitation with respect to temperature, which resulted in more hard regions across grains. Hardness also shows an increasing relationship, as expected. Fracture surfaces are analyzed on stereo microscopy and Scanning electron microscopy (SEM) to find the final mode of fracture, that is brittle, ductile or transitional (combination of both brittle and ductile).
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References
A. Ma, K. Suzuki, Y. Nishida, N. Saito, I. Shigematsu, M. Takagi, H. Iwata, A. Watazu and T. Imura, Impact toughness of an ultrafine-grained Al–11mass% Si alloy processed by rotary-die equal-channel angular pressing, Acta Materialia, 53 (1) (2005) 211–220.
J. M. Al-Murshdy, Effect of heat treatments on the impact toughness and hardness of (2024) aluminum alloy, Journal of Kerbala University, 6 (1) (2008) 233–241.
N. E. Salehudin, A. Jalar and A. R. Daud, Correlation between heat treatment and impact energy of aluminium alloy AA6061 and AA6063, National Conference on Postgraduate Research (NCON-PGR09), Pahang, Malaysia (2009) 153–158.
O. K. Abubakre, U. P. Mamaki and R. A. Muriana, Investigation of the quenching properties of selected media on 6061 aluminum alloy, J. Miner. Mater. Charact. Eng., 8 (4) (2009) 303–315.
D. Casari, A. Fortini and M. Merlin, Fracture behaviour of grain refined A356 cast aluminium alloy: tensile and Charpy impact specimens, CONVEGNO IGF XXII, Rome, Italy (2013).
S. Ozden, R. Ekici and F. Nair, Investigation of impact behaviour of aluminium based SiC particle reinforced metal–matrix composites, Composites Part A: Applied Science and Manufacturing, 38 (2) (2007) 484–494.
M. F. Ibrahim, E. Samuel, A. M. Samuel, A. M. A. Al-Ahmari and F. H. Samuel, Impact toughness and fractography of Al–Si–Cu–Mg base alloys, Materials & Design, 32 (7) (2011) 3900–3910.
A. Shokuhfar and O. Nejadseyfi, A comparison of the effects of severe plastic deformation and heat treatment on the tensile properties and impact toughness of aluminum alloy 6061, Materials Science and Engineering: A, 594 (2014) 140–148.
M. Peroni, G. Solomos and V. Pizzinato, Impact behaviour testing of aluminium foam, International Journal of Impact Engineering, 53 (2013) 74–83.
I. Sudhakar, V. Madhu, G. M. Reddy and K. S. Rao, Enhancement of wear and ballistic resistance of armour grade AA7075 aluminium alloy using friction stir processing, Defence Technology, 11 (1) (2014) 10–17.
ASM Handbook, Heat Treating, ASM International, Materials Park, Ohio, USA, 4 (1991).
ASTM E 23-09, Standard Test Method for Notched Bar Impact Testing of Metallic Materials, West Conshohocken; ASTM Committee, ASTM International (2009).
ASTM E 407-99, Standard practice for microetching metals and alloys, West Conshohecken; ASTM Committee, ASTM International, Philadelphia (1999).
M. Wierzbinska and J. Sieniawski, Microstructural changes of Al-Cu alloys after prolonged annealing at elevated temperature, Recent Trends in Processing and Degradation of Aluminium Alloys, Publisher InTech, Croatia (2011).
T. Lyman, Metals Hand Book, Atlas of Microstructures of industrial Alloys, 8th Ed., American Society for Metals, 7 (1972).
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Recommended by Associate Editor Hak-Sung Kim
Muhammad Muzamil is currently working as an Asst. Prof. in Mechanical Eng. Dept. NEDUET, Pakistan. His Expert areas are Finite Element Analysis and Mechanical Testing of Materials.
Maaz Akhtar is a Mechanical Engineering graduate from NED University of Engineering and Technology, Pakistan. He got his Doctorate Degree from Sultan Qaboos University, Oman. His Expert areas are Mechanics of Materials and Finite Element Analysis.
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Muzamil, M., Akhtar, M., Samiuddin, M. et al. Effect of heat treatment on impact resistance of AU5GT and AS7G06 aluminum alloys. J Mech Sci Technol 30, 4543–4548 (2016). https://doi.org/10.1007/s12206-016-0924-9
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DOI: https://doi.org/10.1007/s12206-016-0924-9