Progress in studying the fatigue behavior of Zr-based bulk-metallic glasses and their composites

Wang, G.Y.; Liaw, Peter K.; Morrison, M. L.

doi:10.1016/j.intermet.2009.01.017

Cited by 70 publications

(62 citation statements)

References 103 publications

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“…For a range of microelectromechanical applications (1,(7)(8)(9)(10)(11)(12), the damage tolerance and crack resistance of MGs from thermal and mechanical stress or strain cycling under partial or complete constraint is of significant scientific and technological interest (13)(14)(15)(16)(17)(18). Bulk MGs can undergo fully reversible elastic deformation to a strain limit of about 2%, more than an order of magnitude greater than that of coarse-grained crystalline metals, whereupon inelastic deformation commences at stress levels on the order of gigapascals (1,2).…”

mentioning

confidence: 99%

Real-time, high-resolution study of nanocrystallization and fatigue cracking in a cyclically strained metallic glass

Wang

Mao

Shan

et al. 2013

Proc. Natl. Acad. Sci. U.S.A.

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Metallic glasses (MGs) exhibit greater elastic limit and stronger resistance to plastic deformation than their crystalline metal counterparts. Their capacity to withstand plastic straining is further enhanced at submicrometer length scales. For a range of microelectromechanical applications, the resistance of MGs to damage and cracking from thermal and mechanical stress or strain cycling under partial or complete constraint is of considerable scientific and technological interest. However, to our knowledge, no realtime, high-resolution transmission electron microscopy observations are available of crystallization, damage, and failure from the controlled imposition of cyclic strains or displacements in any metallic glass. Here we present the results of a unique in situ study, inside a high-resolution transmission electron microscope, of glassto-crystal formation and fatigue of an Al-based MG. We demonstrate that cyclic straining progressively leads to nanoscale surface roughening in the highly deformed region of the starter notch, causing crack nucleation and formation of nanocrystals. The growth of these nanograins during cyclic straining impedes subsequent crack growth by bridging the crack. In distinct contrast to this fatigue behavior, only distributed nucleation of smaller nanocrystals is observed with no surface roughening under monotonic deformation. We further show through molecular dynamics simulation that these findings can be rationalized by the accumulation of strain-induced nonaffine atomic rearrangements that effectively enhances diffusion through random walk during repeated strain cycling. The present results thus provide unique insights into fundamental mechanisms of fatigue of MGs that would help shape strategies for material design and engineering applications.fatigue crack initiation | fatigue crack growth | fracture | shear diffusion transformation zone M etallic glasses (MGs) possess several unique physical properties, including greater elastic limit and stronger resistance to plastic deformation, compared with crystalline metals and alloys (1-7). For a range of microelectromechanical applications (1, 7-12), the damage tolerance and crack resistance of MGs from thermal and mechanical stress or strain cycling under partial or complete constraint is of significant scientific and technological interest (13-18). Bulk MGs can undergo fully reversible elastic deformation to a strain limit of about 2%, more than an order of magnitude greater than that of coarse-grained crystalline metals, whereupon inelastic deformation commences at stress levels on the order of gigapascals (1, 2). Such high strength, however, is often accompanied by very limited ductility at room temperature. Experiments on MGs in thin-film form or as small-volume structures (typically hundreds of nanometers in linear dimensions) reveal that their elastic strain limit and corresponding strength are further enhanced, to values double those of bulk MGs (7-9). These findings suggest opportunities to use MGs in micro-and nanoscale syst...

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mentioning

confidence: 99%

Real-time, high-resolution study of nanocrystallization and fatigue cracking in a cyclically strained metallic glass

Wang

Mao

Shan

et al. 2013

Proc. Natl. Acad. Sci. U.S.A.

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“…However multiple fatigue studies for the Zr-based family have been reported, and depending on the composition, loading geometry, and loading frequency, endurance limits ranging between 5% and 25% of the associated yield strengths have been reported. 13,14 Therefore, the endurance limit of the metallicglass foam material investigated in this study appears to fall within a range representative of the fatigue-endurance limit of the parent metallic glass. By plotting the fatigue ratio versus fatigue life for the ten foam specimens, a universal stress-life curve for the foam can be constructed.…”

Section: ͑1͒mentioning

confidence: 54%

“…As seen in the curve, the average fatigue life of the material increases with decreasing fatigue ratio until an endurance limit is attained, a trend consistent with stress-life curves of monolithic metallic glasses or other materials in general. 13,14 …”

Section: ͑1͒mentioning

confidence: 99%

“…11,12 The fatigue-endurance capability of these materials stimulated considerable interest over the last decade, and spurred a significant number of investigations to assess their fatigue behavior. 13,14 The plastic deformability in bending demonstrated by metallic-glass wires and plates having dimensions below the material plastic zone has inspired the development of metallic-glasses foams. [15][16][17][18][19] Introducing substantial porosity in a metallic glass results in a random network of cells and intracellular struts/membranes with thicknesses on the order of the plastic zone or less.…”

Section: Introductionmentioning

confidence: 99%

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Compression-compression fatigue of Pd43Ni10Cu27P20 metallic glass foam

Wang

Demetriou

Schramm

et al. 2010

Journal of Applied Physics

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Compression-compression fatigue testing of metallic-glass foam is performed. A stress-life curve is constructed, which reveals an endurance limit at a fatigue ratio of about 0.1. The origin of fatigue resistance of this foam is identified to be the tendency of intracellular struts to undergo elastic and reversible buckling, while the fatigue process is understood to advance by anelastic strut buckling leading to localized plasticity ͑shear banding͒ and ultimate strut fracture. Curves of peak and valley strain versus number of cycles coupled with plots of hysteresis loops and estimates of energy dissipation at various loading cycles confirm the four stages of foam-fatigue.

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“…Bulk metallic glasses (BMGs) are known for their excellent properties including high fracture strength, high hardness, large elastic deflection (Chen, 2008;Lewandowski, 2001;Trexler and Thadhani, 2010;Wang et al, 2009;Gu et al, 2010;Wang, 2012). However, at temperatures well below the glass transition and at high stresses, BMGs undergo inhomogeneous deformation by concentrating severe plastic strain into nanoscale shear bands (Jiang et al, 2008a;Lewandowski and Greer, 2006;Yang et al, 2005;Dai et al, 2005;Greer et al, 2013;Spaepen, 1977;Argon, 1979;Yang et al, 2006;Xu and Ma, 2014).…”

Section: Introductionmentioning

confidence: 99%

On the compressive failure of tungsten fiber reinforced Zr-based bulk metallic glass composite

Chen

Jiang

et al. 2015

International Journal of Solids and Structures

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a b s t r a c tIn this paper, a combination of experimentation and analysis is used to identify and study the mechanisms that govern the failure of tungsten fiber reinforced Zr 41.2 Ti 13.8 Cu 10 Ni 12.5 Be 22.5 bulk metallic glass composite. In the experimental part, quasi-static and dynamic compressive behaviors of this composite with various fiber volume fractions were systematically investigated. For this composite under uniaxial compression, both the microstructure and strain rate are found to affect the compressive failure behavior. With the increasing fiber volume fraction, or with the decreasing strain rate, the failure mode of the composite switches from shear to splitting. Motivated by the experimental findings, an energy competition mechanism is proposed to unveil these fundamental behaviors of the tungsten fiber reinforced bulk metallic glass composite. The critical energy dissipations for shear banding and splitting of the composite are derived as the functions of tungsten fiber volume fraction and strain rate. It is found that the failure behavior of the composite is decided by the energy competition between shear banding and splitting.

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Progress in studying the fatigue behavior of Zr-based bulk-metallic glasses and their composites

Cited by 70 publications

References 103 publications

Real-time, high-resolution study of nanocrystallization and fatigue cracking in a cyclically strained metallic glass

Real-time, high-resolution study of nanocrystallization and fatigue cracking in a cyclically strained metallic glass

Compression-compression fatigue of Pd43Ni10Cu27P20 metallic glass foam

On the compressive failure of tungsten fiber reinforced Zr-based bulk metallic glass composite

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