Stress-corrosion fatigue–crack growth in a Zr-based bulk amorphous metal

Schroeder, V.; Ritchie, Robert O.

doi:10.1016/j.actamat.2005.12.006

Cited by 50 publications

(39 citation statements)

References 27 publications

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“…Furthermore, the application of anodic potentials was found to cause an increase of crack growth rates by several orders of magnitude. Fundamental investigations on CF of the same glassy alloy were provided by Schroeder et al (1999) and Schroeder and Ritchie (2006). They determined the threshold value for fatigue crack initiation ΔKth to be 0.9 MPa√m in aqueous solution instead of 3 MPa√m tested in air.…”

mentioning

confidence: 99%

Corrosion Fatigue Studies on a Bulk Glassy Zr-Based Alloy under Three-Point Bending

et al. 2017

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Corrosion fatigue (CF) tests were carried out on bulk glassy Zr52.5Cu17.9Al10Ni14.6Ti5 (Vitreloy 105) samples under load-controlled three-point bending conditions with a load ratio of R = 0.1 in 0.01 M Na2SO4 + 0.01 M NaCl electrolyte. During cyclic testing, the bar-shaped specimens were polarized in situ at constant potentials and the current was monitored. Three different anodic potentials within the interval between the pitting potential EP and the repassivation potential ER and three different load amplitudes were applied. In some cases, in situ microscopic observations revealed the formation of black corrosion products in the vicinity of the crack tip during anodic polarization. Fractographic analysis revealed a clear distinction between two modes of crack growth characterized by smooth dissolution induced regions on the one hand and slim fast fracture areas on the other hand. Both alternating features contributed to a broad-striated CF fracture surface. Moreover, further fatigue tests were carried out under free corrosion conditions yielding additional information on crack initiation and crack propagation period by means of the open circuit potential (OCP) changes. Thereby, a slight increase in OCP was detected after rupture of the passive layer due to bare metal exposed to the electrolyte. The electrochemical response increased continuously according to stable crack propagation until fracture occurred. Finally, the fracture surfaces of the CF samples were investigated by energy dispersive X-ray with the objective of analyzing the elemental distribution after anodic dissolution. Interestingly, anodic polarization at a near repassivation potential of −50 mV vs. saturated calomel electrode (SCE), which commands a constant electric potential of E = 0.241 V vs. standard hydrogen electrode (SHE), led to favorable effects on the fatigue lifetime. In conclusion, all results are conflated to a CF model for bulk glassy Vitreloy 105 under anodic polarization in chloridecontaining electrolyte and compared to the previously proposed stress corrosion mechanisms under similar conditions.

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confidence: 99%

Corrosion Fatigue Studies on a Bulk Glassy Zr-Based Alloy under Three-Point Bending

et al. 2017

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“…Most work related to environmentally induced cracking of Zr-based BMGs was done on hydrogen effects (e.g., [44][45][46][47][48][49][50][51][52]) and on corrosion fatigue [53][54][55][56][57][58][59][60]. Studies on stress corrosion cracking of Zr-based BMGs are rather scarce [9,10,13,53,61].…”

Section: Environmentally Induced Crackingmentioning

confidence: 99%

“…Schroeder and Ritchie [54,56] Fatigue experiments were conducted under increasing and decreasing range of stress intensity factor ΔK and under constant cyclic loading. A particular sensitivity of the fatigue crack growth to NaCl solutions under OCP conditions was detected with a crack growth rate being three orders of magnitude higher than that in air.…”

Section: Corrosion Fatiguementioning

confidence: 99%

Stress-Corrosion Interactions in Zr-Based Bulk Metallic Glasses

Gostin

Eigel

Grell

et al. 2015

Metals

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Stress-corrosion interactions in materials may lead to early unpredictable catastrophic failure of structural parts, which can have dramatic effects. In Zr-based bulk metallic glasses, such interactions are particularly important as these have very high yield strength, limited ductility, and are relatively susceptible to localized corrosion in halide-containing aqueous environments. Relevant features of the mechanical and corrosion behavior of Zr-based bulk metallic glasses are described, and an account of knowledge regarding corrosion-deformation interactions gathered from ex situ experimental procedures is provided. Subsequently the literature on key phenomena including hydrogen damage, stress corrosion cracking, and corrosion fatigue is reviewed. Critical factors for such phenomena will be highlighted. The review also presents an outlook for the topic.

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“…At high percentage the cobalt forms a superficial protective film, probably a hydrated oxide, which prevents further dissolutions [32][33][34] . The corrosion behaviour of the metallic glasses primarily depends on the character of the alloying elements.…”

Section: Effect Of Cobalt On the Corrosion Behaviour Of Amorphous Fe-mentioning

confidence: 99%

Effect of cobalt on the corrosion behaviour of amorphous Fe-Co- Cr-B-Si alloys in dilute mineral acids

Solomon

2010

REVMETAL

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The aim of this paper was to investigate the effect of increasing cobalt content on the corrosion resistance of the FeCo-Cr-B-Si alloys in dilute mineral acids. The corrosion rates in 0.5N HCl, 1N HCl and 1N H 2 SO 4 significantly decrease with an increase in cobalt content. The alloys with a larger amount of cobalt can passivate spontaneously. The high corrosion resistance of the Fe-Co-Cr-B-Si alloys is also due to the formation of chromium -enriched passive film. Generally, the corrosion resistance of chromium -bearing alloy is improved by alloying with various metalloids but it is lowered by addition of boron and silicon. The corrosion behaviour of the amorphous Fe 75-x Co x Cr 1 B 7 Si 17 alloys obtained by the melt-spinning technique was studied using gravimetric method. The best results were obtained with Fe 65 Co 10 Cr 1 B 7 Si 17 alloy. The studied amorphous alloy ribbons exhibit not only excellent physical properties which are useful for many electric and magnetic applications: magnetic sensors, power transformers, high frequency transformers, etc., but also a very good corrosion resistance which extend their application domain. KeywordsAmorphous alloy; Corrosion; X-Ray diffraction; Alloying element; Passivation; Metalloid. Efecto del cobalto en el comportamiento de la corrosión de aleaciones amorfas Fe-Co-Cr-B-Si en ácidos minerales diluidos ResumenEste trabajo presenta los resultados de la investigación sobre la resistencia a la corrosión de un nuevo sistema de aleaciones amorfas, p. ej., Fe-Co-Cr-B-Si. El comportamiento de la corrosión de aleaciones amorfas así como el de cualquier otra aleación cristalina puede ser determinado, en ambas, por factores internos (la estructura y composición de la aleación) y por factores externos (tipo medio agresivo, concentración y coeficiente pH). La falta de cristalinidad y de defectos específicos al estado de cristalinidad -limitaciones de grano, dislocaciones y segregaciones-aseguran una alta resistencia a la corrosión a las aleaciones amorfas, en lugar de ser termodinámicamente metaestables La investigación se desarrolló a través del método gravimétrico en muestras de aleación amorfa Fe 75-x Co x Cr 1 B 7 Si 17 obtenidos por la técnica de centrifugado. Esta investigación muestra la influencia de la composición química de la aleación, por ejemplo, el porcentaje de cobalto y el medio de trabajo 0,5N HCl, 1N HCl y 1N H 2 SO 4 en la resistencia a la corrosión. Los mejores resultados fueron obtenidos con Fe 65 Co 10 Cr 1 B 7 Si 17.

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Stress-corrosion fatigue–crack growth in a Zr-based bulk amorphous metal

Cited by 50 publications

References 27 publications

Corrosion Fatigue Studies on a Bulk Glassy Zr-Based Alloy under Three-Point Bending

Corrosion Fatigue Studies on a Bulk Glassy Zr-Based Alloy under Three-Point Bending

Stress-Corrosion Interactions in Zr-Based Bulk Metallic Glasses

Effect of cobalt on the corrosion behaviour of amorphous Fe-Co- Cr-B-Si alloys in dilute mineral acids

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