Multiple Shear Bands in Zr-Based Bulk Metallic Glass Processed by Severe Plastic Deformation

Abstract:

The Zr₆₂Cu₂₂Al₁₀Fe₅Dy₁ bulk metallic glass was subjected to high pressure torsion (HPT) processing at temperatures of 20 and 150°C. Structural studies were carried out by TEM on the lamella-sample prepared from the HPT-specimens in transversal direction to the specimen plane. TEM studies revealed formation of multiple shear bands with spacings in a 20-50 nm range for both HPT states. Shear bands could be divided in two types: primary and secondary bands. The morphology of shear bands strongly depends on the processing temperature. Shear bands are distributed homogeneously throughout the whole lamella-sample for state processed by HPT at temperature of 20°C. Regions with shear bands are divided by amorphous regions on lamella-sample cut from the sample processed by HPT at temperature of 150°C. Analysis of optical microscopy and SEM data showed that shear bands are distributed throughout the whole volume of HPT-specimens.

• Periodical: Defect and Diffusion Forum (Volume 385)
• Pages: 319-324
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.385.319
• Online since: July 2018
• Authors: Evgeniy Boltynjuk*, Evgeniy Ubyivovk, Dmitriy Gunderov, Vladimir Mikhalovskii, Ruslan Z. Valiev
• Keywords: Metallic Glasses, Microstructure, Severe Plastic Deformation, Shear Bands, Transmission Electron Microscopy

References

[1] C.A. Schuh, T.C. Hufnagel, U. Ramamurty, Mechanical behavior of amorphous alloys, Acta Mater. 55 (2007) 4067-4109.

DOI: 10.1016/j.actamat.2007.01.052

[2] M.F. Ashby, A.L. Greer, Metallic glasses as structural materials, Scr. Mater. 54 (2006) 321-326.

[3] H.W. Sheng, W.K. Luo, F.M. Alamgir, J.M. Bai, E. Ma, Atomic-level structure and structure-property relationship in metallic glasses, Nature 439 (2006) 419-425.

DOI: 10.1038/nature04421

[4] Y. Yokoyama, K. Yamano, K. Fukaura, H. Sunada, A. Inoue, Enhancement of ductility and plasticity of Zr55Cu30Al10Ni5 bulk glassy alloy by cold rolling, Mater. Trans. 42 (2001) 623-632.

DOI: 10.2320/matertrans.42.623

[5] Q.P. Cao, J.F. Li, Y.H. Zhou, A. Horsewell, J.Z. Jiang, Effect of rolling deformation on the microstructure of bulk Cu60Zr20Ti20 metallic glass and its crystallization, Acta Mater. 54 (2006) 4373-4383.

DOI: 10.1016/j.actamat.2006.05.030

[6] L. He, M.B. Zhong, Z.H. Han, Q. Zhao, F. Jiang, J. Sun, Orientation effect of pre-introduced shear bands in a bulk-metallic glass on its work-ductilising,, Mater. Sci. Eng. A 496 (2008) 285-290.

DOI: 10.1016/j.msea.2008.05.038

[7] M.H. Lee, K.S. Lee, J. Das, J. Thomas, U. Kühn, J. Eckert, Improved plasticity of bulk metallic glasses upon cold rolling, Scr. Mater. 62 (2010) 678-681.

DOI: 10.1016/j.scriptamat.2010.01.024

[8] E. Ma, Nanocrystalline materials: Controlling plastic instability, Nature Mater. 2 (2003) 7-8.

[9] R.Z. Valiev, R.K. Islamgaliev, I.V. Alexandrov, Bulk nanostructured materials from severe plastic deformation, Prog. Mater. Sci. 45 (2000) 103-189.

DOI: 10.1016/s0079-6425(99)00007-9

[10] X.D. Wang, Q. P. Cao, J. Z. Jiang, H. Franz, J. Schroers, R.Z. Valiev, Y. Ivanisenko, H. Gleiter, H.-J. Fecht, Atomic-level structural modifications induced by severe plastic shear deformation in bulk metallic glasses, Scr. Mater. 64 (2011).

DOI: 10.1016/j.scriptamat.2010.09.015

[11] B. Zheng, Y. Zhou, S. N. Mathaudhu, R. Z. Valiev, C. Y. A. Tsao, J. M. Schoenung, E. J. Lavernia, Multiple and extended shear band formation in MgCuGd metallic glass during high-pressure torsion, Scr. Mater. 86 (2014) 24-27.

DOI: 10.1016/j.scriptamat.2014.04.023

[12] F. Meng, K. Tsuchiya, I. Seiichiro, Y. Yokoyama, Reversible transition of deformation mode by structural rejuvenation and relaxation in bulk metallic glass, Appl. Phys. Lett. 101 (2012).

DOI: 10.1063/1.4753998

[13] W. Dmowski, Y. Yokoyama, A. Chuang, Y. Ren, M. Umemoto, K. Tsuchiya, A. Inoue, T. Egami, Structural rejuvenation in a bulk metallic glass induced by severe plastic deformation, Acta Mater. 58 (2010) 429-438.

DOI: 10.1016/j.actamat.2009.09.021

[14] W. Li, L. Li, Y. Nan, Z. Xu, X. Zhang, A.G. Popov, D.V. Gunderov, V.V. Stolyarov, Nanocrystallization and magnetic properties of amorphous Nd9Fe85B6 subjected to high-pressure torsion deformation upon annealing, J. Appl. Phys. 104 (2008).

DOI: 10.1063/1.2959379

[15] S.-H. Joo, D.-H. Pi, A. D. H. Setyawan, H. Kato, M. Janecek, Y.C. Kim, S. Lee, H.S. Kim, Work-Hardening Induced Tensile Ductility of Bulk Metallic Glasses via High-Pressure Torsion, Sci. Rep. 5 (2015).

DOI: 10.1038/srep09660

[16] E.V. Ubyivovk, E.V. Boltynjuk, D.V. Gunderov, A.A. Churakova, A.R. Kilmametov, R.Z. Valiev, HPT-induced shear banding and nanoclustering in a TiNiCu amorphous alloy, Mater. Lett. 209 (2017) 327-329.

DOI: 10.1016/j.matlet.2017.08.028

[17] E.V. Boltynjuk, D.V. Gunderov, E.V. Ubyivovk, M.A. Monclús, L.W. Yang, J.M. Molina-Aldareguia, A.I. Tyurin, A. Kilmametov, A.A. Churakova, A.Yu. Churyumov, R.Z. Valiev, Enhanced strain rate sensitivity of Zr-based bulk metallic glasses subjected to high pressure torsion, J. Alloys Compd. 747 (2018).

DOI: 10.1016/j.jallcom.2018.03.018

[18] H. Bei, S. Xie, E.P. George, Softening Caused by Profuse Shear Banding in a Bulk Metallic Glass, Phys. Rev. Lett. 96 (2006).

DOI: 10.1103/physrevlett.96.105503

[19] Y. Xu, H. Hahn, J. Li, Effects of room-temperature rolling on microstructure and crystallization behavior of Zr55Cu40Al5 metallic glass, Intermetallics 18 (2010) 2039-(2043).

DOI: 10.1016/j.intermet.2010.06.007

[20] H. Shao, Y. Xu, B. Shi, C. Yu, H. Hahn, H. Gleiter, J. Li, High density of shear bands and enhanced free volume induced in Zr 70Cu20Ni10 metallic glass by high-energy ball milling, J. Alloys Compd. 548 (2013) 77-81.

DOI: 10.1016/j.jallcom.2012.08.132

[21] Y. Xu, B. Shi, Z. Ma, J. Li, Evolution of shear bands, free volume, and structure in room temperature rolled Pd40Ni40P20 bulk metallic glass, Mater. Sci. Eng. A 623 (2015) 145-152.

DOI: 10.1016/j.msea.2014.11.012