Size Effect in Plastic Deformation and Failure of Metallic Glasses

2020 ◽  
Vol 405 ◽  
pp. 212-216
Author(s):  
Jozef Miškuf ◽  
Kornel Csach ◽  
Alena Juríková ◽  
Mária Demčáková ◽  
Mária Demčáková ◽  
...  
Keyword(s):  
Cell Morphology ◽  
Metallic Glasses ◽  
High Strength ◽  
Dimple Size ◽  
Deformation And Failure ◽  
Composition And Structure ◽  
Instantaneous Deformation ◽  
20 Nm ◽  
Short Time ◽  
Stored Elastic Energy

Depending on the composition and structure of metallic glasses cells with the dimensions in the range from tenths nanometers to tenths micrometers were observed on the ductile fracture surface. The variation in dimple size was compared with the serrations presented on the loading curve at the nanoindentation of the metallic glasses with different compositions. Higher instantaneous deformation can be connected with simultaneous shearing at more suitable shear band configurations. The cell morphology with the various cell sizes is observed at the failure of the metallic glasses. At the failure of high strength metallic glasses, the cells are formed in short time due to the release of high amount of stored elastic energy. In this case the uniform cell morphology with the cell size of about 20 nm is observed.

High-strength Cu–Ti-rich bulk metallic glasses and nano-composites

2003 ◽  
Vol 94 (5) ◽  
pp. 615-620 ◽  
Author(s):  
Mariana Calin ◽  
Jürgen Eckert ◽  
Ludwig Schultz
Keyword(s):  
Metallic Glasses ◽  
Bulk Metallic Glasses ◽  
High Strength ◽  
Nano Composites

JESSOP JS17Cr-4Ni

Alloy Digest ◽  
1982 ◽  
Vol 31 (7) ◽  
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Food Processing ◽  
Precipitation Hardening ◽  
High Strength ◽  
Heat Treating ◽  
Steel Company ◽  
Lower Strength ◽  
Nickel Copper ◽  
Short Time

Abstract JESSOP JS17Cr-4Ni is a martensitic, precipitation-hardening chromium-nickel-copper stainless steel. It provides an excellent combination of high strength and hardness, short-time low-temperature precipitation hardening and good mechanical properties at temperatures up to 600 F (316 C). Its corrosion resistance is quite good but inferior to lower strength grades produced for corrosion-resistance applications. JS17Cr-4Ni is used widely for critical applications in the aerospace, chemical, food processing and other industries. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness and fatigue. It also includes information on corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: SS-412. Producer or source: Jessop Steel Company.

scholarly journals Boron Concentration Induced Co-Ta-B Composite Formation Observed in the Transition from Metallic to Covalent Glasses

2020 ◽  
Vol 5 (1) ◽  
pp. 18
Author(s):  
Simon Evertz ◽  
Stephan Prünte ◽  
Lena Patterer ◽  
Amalraj Marshal ◽  
Damian M. Holzapfel ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Metallic Glasses ◽  
Boron Concentration ◽  
High Strength ◽  
Point Of View ◽  
Composite Formation ◽  
Structural Applications ◽  
Glassy Materials ◽  
Metallic Bonding ◽  
Composite Region

Due to their unique property combination of high strength and toughness, metallic glasses are promising materials for structural applications. As the behaviour of metallic glasses depends on the electronic structure which in turn is defined by chemical composition, we systematically investigate the influence of B concentration on glass transition, topology, magnetism, and bonding for B concentrations x = 2 to 92 at.% in the (Co6.8±3.9Ta)100−xBx system. From an electronic structure and coordination point of view, the B concentration range is divided into three regions: Below 39 ± 5 at.% B, the material is a metallic glass due to the dominance of metallic bonds. Above 69 ± 6 at.%, the presence of an icosahedra-like B network is observed. As the B concentration is increased above 39 ± 5 at.%, the B network evolves while the metallic coordination of the material decreases until the B concentration of 67 ± 5 at.% is reached. Hence, a composite is formed. It is evident that, based on the B concentration, the ratio of metallic bonding to icosahedral bonding in the composite can be controlled. It is proposed that, by tuning the coordination in the composite region, glassy materials with defined plasticity and processability can be designed.

Core-shell Mg66Zn30Ca4 bulk metallic glasses composites reinforced by Fe with high strength and controllable degradation

2021 ◽  
Vol 138 ◽  
pp. 107334 ◽  
Author(s):  
Kun Li ◽  
Zeyun Cai ◽  
Peng Du ◽  
Tao Xiang ◽  
Xinxin Yang ◽  
...  
Keyword(s):  
Metallic Glasses ◽  
Bulk Metallic Glasses ◽  
High Strength ◽  
Core Shell ◽  
Controllable Degradation

Plasma Arc Spraying of Cu-Ti-Zr-Ni Amorphous Alloys

2000 ◽  
Author(s):  
D.J. Sordelet ◽  
P. Huang ◽  
M.F. Besser ◽  
E. Lepecheva
Keyword(s):  
Cross Sections ◽  
Metallic Glasses ◽  
High Strength ◽  
Amorphous Structure ◽  
High Fracture Toughness ◽  
Arc Spraying ◽  
Plasma Arc ◽  
High Fracture ◽  
Spray Coatings ◽  
Sprayed Coatings

Abstract A brief feasibility study was performed to produce thermal spray coatings using gas atomized powders of Cu47Ti34-xZr11Ni8Six, where x=0 and 1. These alloys have previously been shown to be capable of forming metallic glasses having thick (1-2 cm) cross sections because they can be cooled from the melt at relatively low cooling rates (e.g., 100-102Ks-1). The properties of these metallic glasses include high strength, high elasticity and high fracture toughness. Amorphous plasma arc sprayed coatings were produced which were close in composition to the starting powders, and exhibited comparable glass transition and crystallization behavior. The amorphous structure of the as-sprayed coatings was used as a source for forming a range of partially devitrified and fully crystallized structures. The average hardness of the coatings increased from around 6 GPa to near 10 GPa as the degree of crystallization increased.

Dynamic Evolution of Defect Structures during Spall Failure of Nanocrystalline Al

MRS Advances ◽  
2016 ◽  
Vol 1 (58) ◽  
pp. 3853-3858
Author(s):  
Kathleen Coleman ◽  
Garvit Agarwal ◽  
Avinash M. Dongare
Keyword(s):  
Shock Loading ◽  
Spall Strength ◽  
Dynamic Evolution ◽  
Defect Structures ◽  
Deformation And Failure ◽  
Average Grain Size ◽  
Initial Shock ◽  
Dynamics Simulations ◽  
20 Nm ◽  
Spall Failure

ABSTRACTThe dynamic evolution and interaction of defects under the conditions of shock loading in nanocrystalline Al with an average grain size of 20 nm is investigated using molecular dynamics simulations for an impact velocity of 1 km/s. Four stages of defect evolution are identified during shock deformation and failure that correspond to the initial shock compression (I), the propagation of the compression wave (II), the propagation and interaction of the reflected tensile waves (III), and the nucleation, growth, and coalescence of voids (IV). The results suggest that the spall strength of the nanocrystalline Al system is attributed to a high density of Shockley partials and a slightly lower density of twinning partials (twins) in the material experiencing the peak tensile pressures.

On the mechanism of deformation and failure in bulk metallic glasses

2014 ◽  
Vol 610 ◽  
pp. 91-105 ◽  
Author(s):  
J.C. Li ◽  
Q. Wei ◽  
X.W. Chen ◽  
F.L. Huang
Keyword(s):  
Metallic Glasses ◽  
Bulk Metallic Glasses ◽  
Deformation And Failure

Fracture Mechanisms of Bulk Amorphous Metal under Impact Loading

2000 ◽  
Vol 644 ◽  
Author(s):  
Takao Kobayashi ◽  
Donald A. Shockey
Keyword(s):  
Cross Sections ◽  
Metallic Glasses ◽  
Microscopic Analysis ◽  
High Impact ◽  
Fracture Mechanisms ◽  
New Materials ◽  
Deformation And Failure ◽  
Failure Resistance ◽  
Diagnostic Instruments ◽  
Insight Into

AbstractAdvanced diagnostic instruments and analyses applied to failure surfaces and cross sections of bulk metallic glasses (BMGs) can provide insight into the deformation and failure of these materials and assist in prototyping new materials with improved failure resistance. Confocal- optics scanning laser microscopic analysis of conjugate fracture surface topographs suggests that the formation and stretching of ligaments are likely keys to the high impact toughness of Vitreloy.

Scandium (Sc) Behavior in High Temperature Ti Alloys

2012 ◽  
Vol 520 ◽  
pp. 57-62
Author(s):  
De Hai Ping ◽  
S.Q. Wu ◽  
Y. Yamabe-Mitarai
Keyword(s):  
Elevated Temperatures ◽  
High Strength ◽  
High Density ◽  
Free Zone ◽  
Minor Addition ◽  
Ti Alloys ◽  
Elevated Temperature Tensile ◽  
Sc Addition ◽  
Average Size ◽  
20 Nm

The microstructural evolution and elevated temperature tensile properties of Ti-6.6Al-5.2Sn-1.8Zr-(0~3.8)Sc (wt%) alloys have been investigated. The Sc-added alloys showed improved yield strength at 650°C and 750°C and with the elongation above 10%. Minor addition of Sc was found to significantly reduce the as-cast grain size. Higher amount of Sc additions resulted in the formation of high density of Sc-oxide, which causes the high strength at elevated temperatures and the reduction of ductility. High density of α2-Ti3Al fine precipitates with an average size of about 20 nm were observed inside equiaxed primary α (αp) grains in the Sc-free or minor Sc added alloys. However, precipitation free zone (PFZ) also formed in those alloys, where grain boundaries are free from any precipitates. Higher Sc addition was found to hinder the formation of PFZ and α2–precipitates.

scholarly journals Performance analysis of the bump beams made of High Strength Steel and Carbon Fiber reinforce plastics

2018 ◽  
Vol 207 ◽  
pp. 03006
Author(s):  
Yi Yao ◽  
Quan Yuan ◽  
Sihuan Fu
Keyword(s):  
Carbon Fiber ◽  
Automobile Industry ◽  
High Strength Steel ◽  
Lightweight Design ◽  
High Strength ◽  
Research Directions ◽  
Deformation And Failure ◽  
Reinforced Plastics ◽  
Fiber Reinforced Plastics ◽  
Fiber Reinforce

Lightweight and safe are the key research directions of the automobile industry. Bump beam is an important part of the car safety protection and it’s lightweight design has drawn much attention. In this paper, the static strength and the low-speed impact performances of two types of bump beam with the same structure, which made of carbon fiber reinforced plastics (CFRP) and high strength steel (HSS), were investigated. Under the condition of static press, frontal and 40% offset impact, part structural stiffness, component crush intrusion, energy absorption were comparison analyzed. In order to guide the product design, the deformation and failure of CFRP beams with five different laminate structures were simulated under frontal and 40% offset impact. The results indicate that, with the same structure, the properties of CFRP bump beam are generally superior to HSS product, more conducive to lightweight and the optimum design of the laminate is [0° / 60° / 120°]

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