Abstract
In the present work, microstructure development and enhancement in the microhardness of Al-Zn-Mg alloys (with 5, 10, and 15% zinc) during equal channel angular pressing (ECAP) were investigated. Dendritic morphology was observed in the cast condition of all three alloys, and precipitates were situated along the inter-dendritic regions. After homogenization, precipitates in the inter-dendritic regions were uniformly distributed in the aluminum matrix and grain boundaries were developed. After 4 passes in route BC, large reduction in the grain size was observed. X-ray diffractometry showed that MgZn2 precipitate was developed in the ECAP-processed samples. Increase in the intensity of MgZn2 peaks was observed when the quantity of zinc is increased in the material. Also, changes in the intensity of XRD peaks were observed in ECAP-processed samples due to shear deformation. After ECAP, substantial increase in the microhardness was perceived. After four passes, microhardness increased to 109, 67, and 58% from the initial condition in A1, A2, and A3 alloys, respectively. Also, improvement in the microhardness was also observed when the quantity of zinc is increased in the material.
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References
R.Z. Valiev, R.K. Islamgaliev, I.V. Alexandrov, Bulk nanostructured materials from severe plastic deformation. Prog. Mater Sci. 45(2), 103–189 (2000)
R.Z. Valiev, T.G. Langdon, Principles of equal-channel angular pressing as a processing tool for grain refinement. Prog. Mater Sci. 51(7), 881–981 (2006)
V.M. Segal, V.I. Raznikov, A.E. Drobyshewsky, V.I. Kopylov, Plastic working of metals by simple shear. Russ. Metall. 1, 99–106 (1981)
Y.T. Zehetbauer, M.J. Zhu, Bulk Nanostructured Materials (Wiley-VCH, Weinheim, 2009)
M.H. Shaeri, M.T. Salehi, S.H. Seyyedein, M.R. Abutalebi, J.K. Park, Microstructure and mechanical properties of Al-7075 alloy processed by equal channel angular pressing combined with aging treatment. Mater. Des. 57, 250–257 (2014)
Y.H. Zhao, X.Z. Liao, Y.T. Zhu, R.Z. Valiev, Enhanced mechanical properties in ultrafine grained 7075 Al alloy. J. Mater. Res. 20(2), 288–291 (2005)
M.J. Starink, N. Gao, M. Furukawa, Z. Horita, C. Xu, T.G. Langdon, Microstructural developments in a spray-cast Al-7034 alloy processed by equal-channel angular pressing. Rev. Adv. Mater. Sci. 7(1), 1–12 (2004)
M. Ebrahimi, S. Attarilar, C. Gode, F. Djavanroodi, Damage prediction of 7025 aluminium alloy during equal-channel angular pressing. Int. J. Miner. Metall. Mater. 21(10), 990–998 (2014)
J. Valder, M. Rijesh, A.O. Surendranathan, Failure analysis of cast tubular specimens of Al-5Zn-Mg while processing at room temperature by equal channel angular pressing (ECAP). J. Fail. Anal. Prev. 14(5), 690–695 (2014)
S.C. Wang, M.J. Starink, N. Gao, X.G. Qiao, C. Xu, T.G. Langdon, Texture evolution by shear on two planes during ECAP of a high-strength aluminium alloy. Acta Mater. 56(15), 3800–3809 (2008)
C.M. Cepeda-Jimenez, J.M. Garcia-Infanta, O.A. Ruano, F. Carreno, Mechanical properties at room temperature of an Al-Zn-Mg-Cu alloy processed by equal channel angular pressing. J. Alloys Compd. 509(35), 8649–86560 (2011)
C. Xu, T.G. Langdon, Creep and superplasticity in a spray-cast aluminium alloy processed by ECA pressing. Mater. Sci. Eng. A 410–411, 398–401 (2005)
G. Purcek, M. Aydin, O. Saray, T. Kucukomeroglu, Enhancement of tensile ductility of severe plastically deformed two-phase Zn-12Al alloy by equal channel angular extrusion. Mater. Sci. Forum 633–634, 437–447 (2010)
M. Aydin, Y. Heyal, Effect of equal channel angular pressing on microstructural and mechanical properties of as cast Al-20 wt%Zn alloy. Mater. Sci. Technol. 29(6), 679–688 (2013)
M. Aydin, High-cycle fatigue behaviour of severe plastically deformed binary Zn-60Al alloy by equal-channel angular extrusion. J. Mater. Process. Technol. 212(8), 1780–1789 (2012)
G.K. Manjunath, G.V. Preetham Kumar, K. Udaya Bhat, Tensile properties and tensile fracture characteristics of cast Al-Zn-Mg alloys processed by equal channel angular pressing. Trans. Indian Inst. Met. 70(3), 833–842 (2017)
K. Nakashima, Z. Horita, M. Nemoto, T.G. Langdon, Development of a multi-pass facility for equal-channel angular processing to high total strains. Mater. Sci. Eng. A 281(1–2), 82–87 (2000)
K.R. Cardoso, D.N. Travessa, W.J. Botta, A.M. Jorge Jr., High strength AA7050 Al alloy processed by ECAP: microstructure and mechanical properties. Mater. Sci. Eng. A 528(18), 5804–5811 (2011)
Y.H. Zhao, X.Z. Liao, Z. Jin, R.Z. Valiev, Y.T. Zhu, Microstructures and mechanical properties of ultrafine grained 7075 Al alloy processed by ECAP and their evolutions during annealing. Acta Mater. 52(15), 4589–4599 (2004)
J. Gubicza, I. Schiller, N.Q. Chinh, J. Illy, Z. Horita, T.G. Langdon, The effect of severe plastic deformation on precipitation in supersaturated Al-Zn-Mg alloys. Mater. Sci. Eng. A 460–461, 77–85 (2007)
S. Zhang, W. Hu, R. Berghammer, G. Gottstein, Microstructure evolution and deformation behaviour of ultrafine-grained Al-Zn-Mg alloys with fine η′ precipitates. Acta Mater. 58(20), 6695–6705 (2010)
N.Q. Chinh, J. Gubicza, T. Czeppe, J. Lendvai, C. Xu, R.Z. Valiev, T.G. Langdon, Developing a strategy for the processing of age-hardenable alloys by ECAP at room temperature. Mater. Sci. Eng. A 516(1–2), 248–252 (2009)
S.G. Chowdhury, C. Xu, T.G. Langdon, Texture evolution in an aluminium alloy processed by ECAP with concurrent precipitate fragmentation. Mater. Sci. Eng. A 473(1–2), 219–225 (2008)
M. Furukawa, Z. Horita, T.G. Langdon, Factors influencing the shearing patterns in equal-channel angular pressing. Mater. Sci. Eng. A 332(1–2), 97–109 (2002)
L.J. Zheng, C.Q. Chen, T.T. Zhou, P.Y. Liu, M.G. Zeng, Structure and properties of ultrafine-grained Al-Zn-Mg-Cu and Al-Cu-Mg-Mn alloys fabricated by ECA pressing combined with thermal treatment. Mater. Charact. 49(5), 455–461 (2002)
W.J. Kim, J.K. Kim, H.K. Kim, J.W. Park, Y.H. Jeong, Effect of post equal-channel-angular-pressing aging on the modified 7075 Al alloy containing Sc. J. Alloys Compd. 450(1–2), 222–228 (2008)
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Manjunath, G.K., Udaya Bhat, K. & Preetham Kumar, G.V. Microstructure Evolution in Cast Al-Zn-Mg Alloys Processed by Equal Channel Angular Pressing. Metallogr. Microstruct. Anal. 7, 77–87 (2018). https://doi.org/10.1007/s13632-017-0412-3
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DOI: https://doi.org/10.1007/s13632-017-0412-3