Fracture toughness and notched toughness of bulk amorphous alloy: Zr-Ti-Ni-Cu-Be

Lowhaphandu, Peravudh; Lewandowski, John J.

doi:10.1016/s1359-6462(98)00102-x

Cited by 228 publications

(164 citation statements)

References 8 publications

Supporting

Mentioning

144

Contrasting

Unclassified

Order By: Relevance

“…7,8) It was also shown that the toughness values for the same Zr-based metallic glass obtained from fatigue precracked 3PB specimens were about 18 MPam 1=2 , while that from the specimens with notch root radii from 0.065 to 0.25 mm were in a range of 101-131 MPam 1=2 . 9) Conner et al 10) reported that notched 3PB Zr-based specimens containing beryllium showed 55-60 MPam 1=2 . Therefore there is significant variability in the measured K IC and K Q data for the same Zr-based metallic glass containing beryllium.…”

Section: Introductionmentioning

confidence: 99%

Fracture Toughness of Zr55Al10Ni5Cu30 Bulk Metallic Glass by 3-Point Bend Testing

et al. 2005

View full text Add to dashboard Cite

show abstract

Section: Introductionmentioning

confidence: 99%

Fracture Toughness of Zr55Al10Ni5Cu30 Bulk Metallic Glass by 3-Point Bend Testing

et al. 2005

View full text Add to dashboard Cite

show abstract

“…Образцы с соотно-шением высоты к диаметру ≤1 показывают высо-кую пластичность [27,52] образцов Zr-Ti-Ni-Cu-Be с надрезом при вве-дении усталостных трещин была значительно ни-же -18,4±1,4 МПа·√ -м [54]. Это свидетельствует о высокой чувствительности ОМС к микроскопи-ческим дефектам и концентраторам напряжений.…”

Section: рис 2 схематическое изображение полос сдвигаunclassified

Properties of Bulk Metallic Glasses

Luzgin¹,

Polkin²

2016

Izv.VUZ. Tsvet. Met.

View full text Add to dashboard Cite

Металловедение и термическая обработка Izvestiya vuzov. Tsvetnaya metallurgiya • 6 • 2016 71 ВведениеМеталлические стекла, получаемые в виде тон-ких чешуек или лент, известны со второй полови-ны прошлого века [1]. Объемные металлические стекла (ОМС) с минимальным размером порядка 100-102 мм в каждом из 3 пространственных из-мерений [2] изначально были получены в системах Pd-Cu-Si и Pd-Ni-P, но ввиду исключительной дороговизны основного компонента (палладия) долгое время не представляли особого интере-са для ученых и инженеров. Впоследствии ОМС, полученные во многих других системах, включая технологически важные -на основе Fe, Mg, Ti и За последние несколько десятилетий открыто относительно небольшое число революционных материалов в области ме-талловедения и физики металлов, и объемные металлические стекла одни из них. Их прочность и твердость значительно выше, а модуль упругости ниже, чем кристаллических сплавов, что приводит к высокой энергии запасенной упругой деформации. Эти материалы также имеют очень хорошую устойчивость к коррозии. В настоящей работе исследованы свойства объемных металлических стекол, в частности тепловые, механические, магнитные, электрические показатели и коррозионная стойкость, а также приводятся области применения данных сплавов. Louzguine-Luzgin D.V., Pol'kin V.I. Properties of bulk metallic glassesA relatively small number of revolutionary discoveries were made in the field of metallurgy and metal physics in the last few decades, and bulk metallic glasses are one of them. The strength and hardness of bulk metallic glasses are much higher while moduli of elasticity are lower than those of crystalline alloys which results in high stored elastic strain energy. These alloys also have very good corrosion resistance. This article covers various properties of bulk metallic glasses, in particular thermal, mechanical, magnetic, electrical properties and corrosion resistance as well as applications of these alloys.Keywords: bulk metallic glasses, strength, ductility, application.

show abstract

“…18 With a J-based analysis, section sizes essentially met validity; the current K Jc values are thus deemed to be accurate and representative of the toughness of these materials. Consequently, in comparison to monolithic BMG alloys, where K Ic can be as low as 20 MPaͱ m, [20][21][22] we can now state with assurance that these metallic glass-matrix composites exhibit toughnesses that are significantly higher than for monolithic BMGs, and further are comparable to the toughest crystalline metallic alloys at these high strength levels ͑Ͼ1 GPa͒.…”

mentioning

confidence: 93%

Fracture toughness and crack-resistance curve behavior in metallic glass-matrix composites

Launey

Hofmann

Suh

et al. 2009

Applied Physics Letters

View full text Add to dashboard Cite

Nonlinear-elastic fracture mechanics methods are used to assess the fracture toughness of bulk metallic glass ͑BMG͒ composites; results are compared with similar measurements for other monolithic and composite BMG alloys. Mechanistically, plastic shielding gives rise to characteristic resistance-curve behavior where the fracture resistance increases with crack extension. Specifically, confinement of damage by second-phase dendrites is shown to result in enhancement of the toughness by nearly an order of magnitude relative to unreinforced glass. © 2009 American Institute of Physics. ͓DOI: 10.1063/1.3156026͔The absence of microstructure in monolithic bulk metallic glasses ͑BMGs͒ can lead to marked strain localization and rapid shear-band propagation. 1,2 This effect, which causes extremely low macroscopic plastic deformability, can be devastating to mechanical performance in that properties that are limited by the extension of cracks, such as tensile ductility, toughness, and fatigue resistance, can become severely compromised. Specifically, unstable fracture can ensue in monolithic BMGs along a single shear band with essentially zero macroscopic ductility, 3,4 such that the toughness is far lower than in comparable crystalline alloys. The essential element to developing high toughness in BMGs is to prevent single shear-band failures. By introducing a second phase in form of crystalline dendrites and by matching microstructural length scales ͑i.e., interdendritic spacing͒ to the mechanical length scales ͑i.e., critical crack size for failure͒, nonlocalized plasticity in metallic glasses can be enhanced significantly. [5][6][7] Indeed, the recent development of in situ bulk metallic glass-matrix composites has shown that provided this phase acts to arrest shear-band propagation over appropriate size scales, 8-10 the problems of poor ductility, toughness, and fatigue resistance can be mitigated.One problem here is that the new composite BMGs are undoubtedly far tougher than monolithic BMGs or some earlier BMG composites and current processing methods often cannot make section sizes large enough to meet the critical validity requirements for accurate fracture mechanics measurements, i.e., not meeting fracture mechanics requirements for valid stress intensity K-or J-dominated crack-tip fields and/or for plane-strain constraint. Indeed, many toughness measurements on BMG materials reported in the literature [11][12][13][14][15] are inaccurate due to problems of inappropriate measurement techniques ͑e.g., the area under a compression stress/strain curve͒, absence of sharp stress concentrators ͑e.g., using a relatively blunt notch rather than a fatigue precrack͒ and insufficient test-sample size. Moreover, while single-value measurements, such as K Ic , properly define the toughness of nominally brittle materials, they can be insufficient for alloys displaying extensive plastic deformation and subcritical cracking, as can occur in many BMG composites. Stable crack growth in metallic glasses is not generally observed and ...

show abstract

Fracture toughness and notched toughness of bulk amorphous alloy: Zr-Ti-Ni-Cu-Be

Cited by 228 publications

References 8 publications

Fracture Toughness of Zr<SUB>55</SUB>Al<SUB>10</SUB>Ni<SUB>5</SUB>Cu<SUB>30</SUB> Bulk Metallic Glass by 3-Point Bend Testing

Fracture Toughness of Zr<SUB>55</SUB>Al<SUB>10</SUB>Ni<SUB>5</SUB>Cu<SUB>30</SUB> Bulk Metallic Glass by 3-Point Bend Testing

Properties of Bulk Metallic Glasses

Fracture toughness and crack-resistance curve behavior in metallic glass-matrix composites

Contact Info

Product

Resources

About