Abstract
In situ observation of the failure characteristics of a cast aluminum alloy has been conducted using a testing system with a high-speed camera. The failure process of the cast Al alloy was captured clearly with an high image resolution (1,024 × 1,024 pixels) at a high frame rate (20,000/s), where the specimen surface for observation was dyed dark using a black oil-based ink. A dark curtain was set behind the test specimen as background. Strong lighting of about 10 klx was used, which was applied to the dark specimen surface for clarification of material failure. The aim of this approach was to detect the failure characteristics or failure objects with bright zone. Using this system, both debris particles flying from the fracture sample and dislocation-like movements were detected. These were observable as tiny bright dots. The flying debris particles of about 35 μm in diameter consisted mainly of Si- and Fe-based eutectic structures. The flying speed of the debris particles was about 1,800 mm/s and their flight distance from the specimen was about 100 mm. The velocity of the dislocation-like movements was found to be less than 1,000 mm/s, and this motion was seen repeatedly before and after sample failure occurred.
References
Zhao HD, Wang F, Li YY, Xia W (2009) Experimental and numerical analysis of gas entrapment defects in plate ADX12 die castings. J Mater Proc Technol 209:4537–4542
Khalifa W, Tsunekawa Y, Okumiya M (2010) Effect of ultrasonic treatment on the Fe-intermtallic phases in ADC12 die cast alloy. J Mater Process Technol 210:2178–2187
Okayasu M, Takasu S, Mizuno M (2012) Relevance of instrumented nano-indentation for the assessment of the mechanical properties of eutectic crystals and α-Al grain in cast aluminum alloys. J Mater Sci 47:241–250
Okayasu M., Takeuchi S., Yamamoto M., Ohfuji H., Precise analysis of mechanical properties of cast ADC12 aluminum alloy, Metall. Mater. Trans. A, under reviewing
Dieter G.E., Mechanical Metallurgy, third ed., McGraw-Hill Series in Materials Science and Engineering, 1986, pp.241–265
Savic V., Hector L.G. Jr., Tensile Deformation and Fracture of Press Hardened Boron Steel Using Digital Image Correlation, Society of Automotive Engineers (SAE) Transactions J. Materials and Manufacturing 2007–01–0790, 2007
Johnston WG, Gilman JJ (1959) Dislocation velocities, dislocation densities, and plastic flow in lithium fluoride crystals. J Appl Phys 30:129–144
Min J, Hector LG Jr, Lin J, Carter JT, Sachdev AK (2014) Spatio-temporal characteristics of propagative plastic instabilities in a rare earth containing magnesium alloy. Int J Plast 57:52–76
Nogiwa K, Yamamoto T, Fukumoto K, Matsui H, Nagai Y, Yubuta K, Hasegawa M (2002) In situ TEM observation of dislocation movement through the ultrafine obstacles in an Fe alloy. J Nucl Mater 307–311:946–950
Zavattieri PD, Savic V, Hector LG Jr, Fekete JR, Tong W, Xuan Y (2009) Spatio-temporal characteristics of the Portevin-Le châtelier effect in austenitic steel with twinning induced plasticity. Int J Plast 25:2298–2330
Tong W, Tao H, Jiang X, Zhang N, Marya MP, Hector LG Jr, Gayden XQ (2005) Deformation and fracture of miniature tensile bars with resistance-spot-weld microstructures. Metall Mater Trans A 36A:2651–2669
Savic V, Hector LG Jr, Fekete JR (2010) Digital image correlation study of plastic deformation and fracture in fully martensitic steel. Exp Mech 50:99–110
Coryell J., Savic V., Hector L., Mishra S., Temperature effects on the deformation and fracture of a quenched-and-partitioned steel, Society of Automotive Engineers Society of Automotive Engineers (SAE) (2013) Paper #2013–01–0610
Okayasu M, Yoshifuji S, Mizuno M, Hitomi M, Yamazaki H (2009) Comparison of mechanical properties of die cast aluminium alloys: cold v. hot chamber die casting and high v. low speed filling die casting. Int J Cast Met Res 22:374–381
Acknowledgments
First of all, we would like to express our appreciation to Dr. Hareesh Tippur for his useful comments and suggestions. This work was supported by a grant (Grant-in-Aid for Scientific Research (C), 2014) from the Japanese Government (Ministry of Education, Science, Sports and Culture). We would also appreciate staffs and students in Akita Prefectural University for their encouragement and technical support.
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Okayasu, M., Takeuchi, S. & Aizawa, K. In Situ Observation of Material Failure in Cast Aluminum Alloy During Monotonic Loading Observed by a High-Speed Camera. Exp Mech 54, 1479–1489 (2014). https://doi.org/10.1007/s11340-014-9913-z
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DOI: https://doi.org/10.1007/s11340-014-9913-z