The quasi-static and cyclic properties of bulk glassy Zr52.5Cu17.9Al10Ni14.6Ti5 alloy (Vitreloy 105) were investigated under three-point bending conditions for two different shot-peened surface states. Residual stress analysis and nanoindentation measurements revealed the presence of compressive residual stresses and an enhanced hardness in the near surface layer after shot peening. Further investigations of the longitudinal cross-sections of the mechanically tested specimens by optical and scanning electron microscopy showed small cracks propagating along shear bands in the vicinity of the fracture surface. The results are in accordance with the improved plasticity of the shot-peened states under quasi-static loading conditions compared to the as-cast reference state. All mechanical testing was carried out with the aim to find a material's state with improved mechanical properties with a special focus on the improvement of the fatigue lifetime and the endurance limit of Vitreloy 105 bulk metallic glass.
PaulyS, LiuG, WangG, Microstructural heterogeneities governing the deformation of Cu47.5Zr47.5Al5 bulk metallic glass composites. Acta Mater. 2009;57:5445–5453. doi: 10.1016/j.actamat.2009.07.042
8.
InoueA, TakeuchiA.Recent development and application products of bulk glassy alloys. Acta Mater. 2011;59:2243–2267. doi: 10.1016/j.actamat.2010.11.027
9.
GreerAL, ChengYQ, MaE.Shear bands in metallic glasses. Mater Sci Eng: R: Rep.2013;74:71–132. doi: 10.1016/j.mser.2013.04.001
10.
ConnerRD, JohnsonWL, PatonNE, Shear bands and cracking of metallic glass plates in bending. J Appl Phys.2003;94:904–911. doi: 10.1063/1.1582555
11.
EckertJ, DasJ, PaulyS, Processing routes, microstructure and mechanical properties of metallic glasses and their composites. Adv Eng Mater.2007;9:443–453. doi: 10.1002/adem.200700043
12.
ConnerRD, Choi-YimH, JohnsonWL.Mechanical properties of Zr57Nb5Al10Cu15.4Ni12.6 metallic glass matrix particulate composites. J Mater Res.1999;14:3292–3297. doi: 10.1557/JMR.1999.0445
13.
NallaRK, AltenbergerI, NosterU, On the influence of mechanical surface treatments—deep rolling and laser shock peening—on the fatigue behavior of Ti–6Al–4V at ambient and elevated temperatures. Mater Sci Eng: A.2003;355:216–230. doi: 10.1016/S0921-5093(03)00069-8
14.
ScudinoS, JerliuB, PaulyS, Ductile bulk metallic glasses produced through designed heterogeneities. Scr Mater.2011;65:815–818. doi: 10.1016/j.scriptamat.2011.07.039
15.
SongKK, PaulyS, ZhangY, Significant tensile ductility induced by cold rolling in Cu47.5Zr47.5Al5 bulk metallic glass. Intermetallics.2011;19:1394–1398. doi: 10.1016/j.intermet.2011.05.001
16.
ZhangY, WangWH, GreerAL.Making metallic glasses plastic by control of residual stress. Nat Mater.2006;5:857–860. doi: 10.1038/nmat1758
17.
ConcustellA, MearFO, SurinachS, Structural relaxation and rejuvenation in a metallic glass induced by shot-peening. Philos Mag Lett.2009;89:831–840. doi: 10.1080/09500830903337919
18.
RaghavanR, AyerR, JinHW, Effect of shot peening on the fatigue life of a Zr-based bulk metallic glass. Scr Mater.2008;59:167–170. doi: 10.1016/j.scriptamat.2008.03.009
19.
FanZ, ZhengZ, JiaoZ.Three-point bending fracture characteristics of bulk metallic glasses. Sci China – Phys Mech Astron.2010;53:654–657. doi: 10.1007/s11433-010-0155-5
20.
LiuY, WangY-M, LiuL.Fatigue crack propagation behavior and fracture toughness in a Ni-free ZrCuFeAlAg bulk metallic glass. Acta Mater.2015;92:209–219. doi: 10.1016/j.actamat.2015.04.003
21.
MorrisonML, BuchananRA, LiawPK, Four-point-bending-fatigue behavior of the Zr-based Vitreloy 105 bulk metallic glass. Mater Sci Eng: A.2007;467:190–197. doi: 10.1016/j.msea.2007.05.066
22.
WangG, LiawP, JinX, Fatigue initiation and propagation behavior in bulk-metallic glasses under a bending load. J Appl Phys. 2010;108, 113512-1-113512.
23.
YueY, WangR, MaDQ, Fatigue behavior of a Zr-based bulk metallic glass under uniaxial tension–tension and three-point bending loading mode. Intermetallics.2015;60:86–91. doi: 10.1016/j.intermet.2015.02.005
24.
LinX, JohnsonWL, RhimWK.Effect of oxygen impurity on crystallization of an undercooled bulk glass forming Zr-Ti-Cu-Ni-Al alloy. Mater Trans.1997;38:473–477. doi: 10.2320/matertrans1989.38.473
25.
SchwarzT, KockelmannH.Die Bohrlochmethode - Ein für viele Anwendungsbereiche optimales Verfahren zur experimentellen Ermittlung von Eigenspannungen. Messtechnische Briefe.1993;29:33–38.
26.
D.G.I.f. StandardizationISO 14577-1:2015, in: Metallic materials – instrumented indentation test for hardness and materials parameters – Part 1: test method, Beuth Verlag GmbH, 2015.
27.
GibmeierJ.Zum Einfluss von Last- und Eigenspannungen auf die Ergebnisse instrumentierter Eindringhärteprüfungen [doctorate thesis]. Kassel University, ISBN 3-89958-120-2, Kassel University Press GmbH, 2005.
Niku-LariA, LuJ, FlavenotJF.Measurement of residual-stress distribution by the incremental hole-drilling method. J Mech Working Technol.1985;11:167–188. doi: 10.1016/0378-3804(85)90023-3
30.
ZhaoJX, WuFF, ZhangZF.Analysis on shear deformation mechanism of metallic glass under confined bending test. Mater Sci Eng: A.2010;527:6224–6229. doi: 10.1016/j.msea.2010.06.039
31.
ConnerRD, LiY, NixWD, Shear band spacing under bending of Zr-based metallic glass plates. Acta Mater.2004;52:2429–2434. doi: 10.1016/j.actamat.2004.01.034
32.
WrightWJ.Deformation mechanisms of the Zr40Ti14Ni10Cu12Be24 bulk metallic glass. Mater Trans Jim. 2001;42:642–649. doi: 10.2320/matertrans.42.642
33.
SunBA, PaulyS, TanJ, Serrated flow and stick–slip deformation dynamics in the presence of shear-band interactions for a Zr-based metallic glass. Acta Mater.2012;60:4160–4171. doi: 10.1016/j.actamat.2012.04.013
34.
SongSX, BeiH, WadsworthJ, Flow serration in a Zr-based bulk metallic glass in compression at low strain rates. Intermetallics.2008;16:813–818. doi: 10.1016/j.intermet.2008.03.007
35.
SongSX, NiehTG.Flow serration and shear-band viscosity during inhomogeneous deformation of a Zr-based bulk metallic glass. Intermetallics.2009;17:762–767. doi: 10.1016/j.intermet.2009.03.005
36.
JiangMQ, LingZ, MengJX, Energy dissipation in fracture of bulk metallic glasses via inherent competition between local softening and quasi-cleavage. Philos Mag.2008;88:407–426. doi: 10.1080/14786430701864753
37.
ZhaoY-Y, ZhangG, EstévezD, Evolution of shear bands into cracks in metallic glasses. J Alloys Compd.2015;621:238–243. doi: 10.1016/j.jallcom.2014.09.205
