Fracture and fatigue behavior of a Zr–Ti–Nb ductile phase reinforced bulk metallic glass matrix composite

Flores, Katharine M.; Johnson, William L.; Dauskardt, Reinhold H.

doi:10.1016/j.scriptamat.2003.08.020

Cited by 111 publications

(69 citation statements)

References 18 publications

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“…This is substantially higher than that for monolithic BMGs; the commonly used Vitreloy 1 (Zr 41.25 Ti 13.75 Ni 10 Cu 12.5 Be 22.5 ) alloy displays a factor of nearly 10 times lower normalized fatigue limit of only a / UTS Ϸ 0.04, i.e., a ϭ 0.075 GPa (20,21), and the older monolithic ribbon metallic glasses have fatigue limits that can drop as low as a / UTS Ϸ 0.05 (17)(18)(19). The fatigue limit of the DH3 composite is also 3 times higher than results for other in situ composite metallic glasses containing ductile dendrites; two alloys to date have been evaluated in fatigue, the Zr 56.2 Ti 13.8 Nb 5.0 Cu 6.9 Ni 5.6 Be 12.5 (LM2) and Cu 47.5 Zr 38 Hf 9.5 Al 5 alloys, where the fatigue limits were measured as a / UTS Ϸ 0.1 (27)(28)(29). In fact, compared with monolithic metallic glasses, which display some of the lowest fatigue limits of any metallic materials, the current DH3 glass-matrix composite has a normalized fatigue limit comparable with structural steels and aluminum alloys; specifically, it is Ͼ30% higher than that of a 300M ultra-high-strength steel ( UTS ϭ 2.3 GPa) (31) and 2090-T81 aluminum-lithium alloys ( UTS ϭ 0.56 GPa) (32), where at this stress ratio (R ϭ 0.1) a / UTS Ϸ 0.2.…”

Section: Resultsmentioning

confidence: 97%

“…The second-phase dendrites are the essential feature leading to the enhancement of the fatigue resistance of our composite BMG alloys to levels of a / UTS Ϸ 0.3 that are comparable to those of high-strength crystalline metallic materials. This approach of adding a second phase to enhance the fatigue limit has been used previously, and yet in these previous studies the normalized fatigue limit remained relatively low ( a / UTS Ϸ 0.1) (27)(28)(29). However, as discussed below, it is the characteristic dimensions of this second phase compared with pertinent mechanical length scales that is the key to attaining good fatigue properties in metallic glass materials.…”

Section: Discussionmentioning

confidence: 98%

“…Indeed, with the recent development of in situ BMG-matrix composites, the problems of poor ductility and toughness in BMGs have been mitigated by the presence of such a second phase that provides a means to arrest the propagation of shear bands (23)(24)(25)(26). However, to date, attempts to similarly enhance the corresponding fatigue resistance have been largely unsuccessful (27)(28)(29). In fact, one study (29) found that the fatigue life was actually reduced, compared with the monolithic glass, after incorporation of a second dendritic phase.…”

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confidence: 99%

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Solution to the problem of the poor cyclic fatigue resistance of bulk metallic glasses

Launey

Hofmann

Johnson

et al. 2009

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

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The recent development of metallic glass-matrix composites represents a particular milestone in engineering materials for structural applications owing to their remarkable combination of strength and toughness. However, metallic glasses are highly susceptible to cyclic fatigue damage, and previous attempts to solve this problem have been largely disappointing. Here, we propose and demonstrate a microstructural design strategy to overcome this limitation by matching the microstructural length scales (of the second phase) to mechanical crack-length scales. Specifically, semisolid processing is used to optimize the volume fraction, morphology, and size of second-phase dendrites to confine any initial deformation (shear banding) to the glassy regions separating dendrite arms having length scales of Ϸ2 m, i.e., to less than the critical crack size for failure. Confinement of the damage to such interdendritic regions results in enhancement of fatigue lifetimes and increases the fatigue limit by an order of magnitude, making these ''designed'' composites as resistant to fatigue damage as high-strength steels and aluminum alloys. These design strategies can be universally applied to any other metallic glass systems.composites ͉ damage confinement ͉ endurance limit ͉ semisolid processing M onolithic bulk metallic glasses (BMGs) have emerged over the past 15 years as a class of materials with unique and unusual properties that make them potential candidates for many structural applications (1). These properties include their near theoretical strengths combined with high formability, low damping, large elastic strain limits, and the ability to be thermoplastically formed into precision net shape parts in complex geometries (2, 3), all of which are generally distinct from, or superior to, corresponding crystalline metals and alloys. However, monolithic BMGs can also display less desirable properties that have severely restricted their structural use. In particular, properties limited by the extension of cracks, such as ductility, toughness, and fatigue, can be compromised in BMGs by inhomogeneous plastic deformation at ambient temperatures where plastic flow is confined in highly localized shear bands (4, 5). Such severe strain localization with the propagation of the shear bands is especially problematic under tensile stress states where catastrophic failure can ensue along a single shear plane with essentially zero macroscopic ductility (6, 7). Consequently, resulting plane-strain K Ic fracture toughnesses in monolithic BMGs are often low (Ϸ15-20 MPa ͌ m), as compared with most crystalline metallic materials, although they are an order of magnitude larger than those for (ceramic) oxide glasses (8, 9). If such strain localization is suppressed such that plastic flow is allowed to be extensive, for example, by blunting the crack tip, then damage would be distributed over larger dimensions with toughness values increasing to Ϸ50 MPa ͌ m or more (8, 10). Whereas some metallic glasses appear to be intrinsically brittle in thei...

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Section: Resultsmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 98%

mentioning

confidence: 99%

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Solution to the problem of the poor cyclic fatigue resistance of bulk metallic glasses

Launey

Hofmann

Johnson

et al. 2009

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

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“…The fatigue fracture surfaces typically include the crack initiation, propagation, fast fracture, and melting regions, in which the crack-propagation area generally dominates the entire fatigue life. [7][8][9][10] However, few compression-compression fatigue studies were performed. 11,12) The stress state of the compression-compression fatigue is significantly different from threepoint-bend, four-point-bend, and tension-tension fatigue.…”

Section: Introductionmentioning

confidence: 99%

Compression-Compression Fatigue and Fracture Behaviors of Zr50Al10Cu37Pd3 Bulk-Metallic Glass

et al. 2007

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The compression-compression fatigue and fracture behaviors were studied on the Zr 50 Al 10 Cu 37 Pd 3 bulk-metallic glasses (BMGs) under a load control, employing an electrohydraulic machine, at a frequency of 10 Hz (using a sinusoidal waveform) with an R ratio of 10, where R ¼ min. = max. ( min. and max. are the applied minimum and maximum stresses, respectively). The obtained results were compared with those of the tension-tension fatigue tests. The life under the compression-compression fatigue was improved significantly. However the fatigueendurance limits in two different stress states are comparable. The fracture morphology and the specimen surfaces were observed. The possible different fracture mechanisms under two kinds of stresses were discussed.

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“…To overcome the ductility problem of BMGs, research has focused on the development of new classes of BMGs [7][8][9] and BMG composites (BMGCs) (see e.g., [10][11][12][13][14][15][16][17][18][19][20][21][22][23] ). As an example of the former, BMGs with high Poisson ratios have shown great promise, although such alloys are expensive as they generally contain large amounts of precious metal elements.…”

Section: Introductionmentioning

confidence: 99%

Recent developments in ductile bulk metallic glass composites

et al. 2013

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Offering a unique suite of mechanical, physical, and chemical properties, bulk metallic glasses (BMGs) show significant promise as engineering materials. Unfortunately, most BMGs exhibit low tensile ductility at ambient temperature that limits their use as structural (load-bearing) materials. To overcome this problem, BMG composites (BMGCs) containing a second phase are being developed for improving ductility by controlling the mechanics of shear band nucleation and growth in the glassy matrix, which is the primary mode of failure in these materials. This review describes some recent developments in BMGCs and discusses the influence of the type of second phase on mechanical behavior.

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Fracture and fatigue behavior of a Zr–Ti–Nb ductile phase reinforced bulk metallic glass matrix composite

Cited by 111 publications

References 18 publications

Solution to the problem of the poor cyclic fatigue resistance of bulk metallic glasses

Solution to the problem of the poor cyclic fatigue resistance of bulk metallic glasses

Compression-Compression Fatigue and Fracture Behaviors of Zr<SUB>50</SUB>Al<SUB>10</SUB>Cu<SUB>37</SUB>Pd<SUB>3</SUB> Bulk-Metallic Glass

Recent developments in ductile bulk metallic glass composites

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