Analysis of Shear Banding in Zr-Based Metallic Glass under Laser Shock Peening and Bending

Abstract:

Metallic glasses have been expected to be used as structural materials since their high strength and high hardness. Unfortunately, their catastrophic brittle fracture behavior with poor plasticity becomes the major weakness for structural application. It has been recognized that the mechanism of plastic deformation in metallic glasses is through the formation of shear bands, which provide them with limited ductility. Laser shock peening (LSP) is an innovative surface treatment technique which can introduce deep compressive residual stress layer to materials for improving their mechanical behavior. In this work, a finite-element model has been developed to numerically simulate the pure bending process, LSP and subsequent bending process. An advanced constitutive equation was established based on the large deformation theory of nonlinear mechanics, the free volume model and the Coulomb-Mohr yield criterion. The model is able to capture the following results: (i) for a given bending deflection, the shear band spacing increases with increasing plate thickness; (ii) for a given plate thickness, the free volume increases with the bending deflection; (iii) for a given thickness and a given deflection, the shear bands increase under the effect of LSP.

• Periodical: Materials Science Forum (Volume 849)
• Pages: 8-13
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.849.8
• Online since: March 2016
• Authors: Jie Fu, Yun Hu Zhu, Chao Zheng, Zhong Ji, Hui Gang Shi
• Keywords: Bulk Metallic Glass, Laser Shock Peening, Shear Bands

References

[1] W.L. Johnson, Bulk glass-forming metallic alloys: Science and technology, MRS Bull, 24(1999) 42–56.

DOI: 10.1557/s0883769400053252

[2] A. Inoue, X.M. Wang, Bulk amorphous FC20 (Fe-C-Si) alloys with small amounts of B and their crystallized structure and mechanical properties, Acta Mater. 48(2000) 1383–1395.

DOI: 10.1016/s1359-6454(99)00394-8

[3] W.H. Wang, C. Dong, C.H. Shek, Bulk metallic glasses, Mater. Sci. Eng. R. 44(2004) 45–89.

[4] A.L. Greer, E. Ma, Bulk metallic glasses: at the cutting edge of metals research, MRS Bull, 32(2007) 611–615.

DOI: 10.1557/mrs2007.121

[5] N.L. Petouhoff, A.J. Ardell, A.F. Jankowski, Mechanical behavior of both sides of an amorphous Fe78B14S18 alloy ribbon as determined from miniaturized disk-bend tests. Acta Metal Mater. 40(1992) 167–177.

DOI: 10.1016/0956-7151(92)90480-3

[6] S. Suto, K. Matsuno, T. Sano, K. Matsui, Bending of amorphous alloys, J. Mater. Proc. Technol. 33(1992) 215–227.

DOI: 10.1016/0924-0136(92)90209-b

[7] A. Inoue, K. Amiya, I. Yoshi, H.M. Kimura, T. Masumoto, Production of Al-based amorphous alloy wires with high tensile strength by melt extraction method, Mater. Trans. JIM, 35(1994) 485–488.

DOI: 10.2320/matertrans1989.35.485

[8] E.P. Barth, F. Spaepen, R. Bye, S.K. Das, Influence of processing on the ductile-to-brittle transition temperature of an Fe–B–Si metallic glass, Acta Mater. 45(1997) 423–428.

DOI: 10.1016/s1359-6454(96)00160-7

[9] 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. JIM, 42(2001) 623–632.

DOI: 10.2320/matertrans.42.623

[10] A. Katuya, A. Inoue, K. Amiya, Production of Ni–Si–B amorphous alloy wires by melt extraction and their thermal and mechanical properties, Int. J. Rapid Solidification, 9(1996) 137–158.

[11] A. Inoue, A. Katsuya, K. Amiya, T. Masumoto, Preparation of amorphous Fe–Si–B and Co–Si–B alloy wires by a melt extraction method and their mechanical and magnetic properties, Mater. Trans. JIM, 36(1995) 802–809.

DOI: 10.2320/matertrans1989.36.802

[12] C.S. Montross, W. Tao, L. Ye, Laser shock processing and its effects on microstructure and properties of metal alloys, Int. J. Fatigue, 24(2002) 1021-1036.

DOI: 10.1016/s0142-1123(02)00022-1

[13] Y.K. Zhang, C.L. Hu, L. Cai, Mechanism of improvement on fatigue life of metal by laser-excited shock waves, Appl. Phys. 72(2001) 113-116.

DOI: 10.1007/s003390000533

[14] A.S. Argon, Plastic deformation in metallic glasses, Acta Metall. 47(1979) 47–58.

[15] M.L. Falk, J.S. Langer, Dynamics of viscoplastic deformation in amorphous solids, Phys. Rev. E. 57(1998) 7192–7205.

DOI: 10.1103/physreve.57.7192

[16] W.J. Wright, T.C. Hufnagel, W.D. Nix, Free volume coalescence and void formation in shear bands in metallic glass, J. Appl. Phys. 93(2003) 1432–1437.

DOI: 10.1063/1.1531212

[17] F. Spaepen, A microscopic mechanism for steady state inhomogeneous flow in metallic glases, Acta Metal. 25(1977) 407–415.

DOI: 10.1016/0001-6160(77)90232-2

[18] W. Zhang, Y.L. Yao, Microscale laser shock processing: modeling, testing and microstructure characterization, J. Manuf. Processes, 3(2002) 128-143.

DOI: 10.1016/s1526-6125(01)70128-4

[19] R.D. Conner, W.L. Johnson, N.E. Paton, W.D. Nix, Shear bands and cracking of metallic glass plates in bending [J], J. Appl. Phys. 94(2003) 904-911.

DOI: 10.1063/1.1582555