Mechanical Properties of Amorphous Metallic Alloys and Their Relation to the Viscosity Characteristic Parameters

For many years amorphous metallic alloys have been prepared by rapid quenching techniques such as vapor condensation or melt quenching. Recently, solid-state reactions have shown to be an alternative for synthesizing amorphous metallic alloys. While solid-state amorphization by ball milling and high energy particle irradiation have been investigated extensively, the growth of amorphous phase by cold-rolling has been limited. This paper presents a morphological and structural study of amorphization of Cu and Ti foils by rolling.Samples of high purity Cu (99.999%) and Ti (99.99%) foils with a thickness of 0.025 mm were used as starting materials. These thin foils were cut to 5 cm (w) × 10 cm (1), and the surface was cleaned with acetone. A total of twenty alternatively stacked Cu and Ti foils were then rolled. Composite layers following each rolling pass were cleaned with acetone, cut into half and stacked together, and then rolled again.

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EFFECTS OF POROSITY ON ULTRASONIC CHARACTERISTIC PARAMETERS AND MECHANICAL PROPERTIES OF GLASS FIBER REINFORCED COMPOSITES

International Journal of Modern Physics Conference Series ◽

10.1142/s2010194512003911 ◽

2012 ◽

Vol 06 ◽

pp. 646-651 ◽

Cited By ~ 1

Author(s):

Wen Ma ◽

Fushun Liu

Keyword(s):

Mechanical Properties ◽

Ultrasonic Attenuation ◽

Ultrasonic Inspection ◽

Fiber Reinforced Composites ◽

Metallographic Analysis ◽

Void Content ◽

Reinforced Composites ◽

Fiber Reinforced ◽

Characteristic Parameters ◽

Distribution Shape

Voids are inevitable in the fabrication of fiber reinforced composites and have a detrimental impact on mechanical properties of composites. Different void contents were acquired by applying different vacuum bag pressures. Ultrasonic inspection and ablation density method were adopted to measure the ultrasonic characteristic parameters and average porosity, the characterization of voids' distribution, shape and size were carried out through metallographic analysis. Effects of void content on the tensile, flexural and interlaminar shear properties and the ultrasonic characteristic parameters were discussed. The results showed that, as vacuum bag pressure went from -50kPa to -98kPa, the voids content decreased from 4.36 to 0.34, the ultrasonic attenuation coefficient decreased, but the mechanical strengths all increased.

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Research on Anisotropic Fracture Mechanical Behavior of Cortical Bone with Combined Method of Fractal and Gray Level Co-Occurrence Matrix

Journal of Biomaterials and Tissue Engineering ◽

10.1166/jbt.2021.2569 ◽

2021 ◽

Vol 11 (1) ◽

pp. 67-75

Author(s):

Dagang Yin ◽

Bin Chen ◽

Huifen Zhou

Keyword(s):

Mechanical Properties ◽

Fracture Surface ◽

Cortical Bone ◽

Fracture Mechanisms ◽

Gray Level ◽

Combined Method ◽

Characteristic Parameters ◽

Fracture Surfaces ◽

Anisotropic Fracture ◽

Occurrence Matrix

The irregular fracture surface of cortical bone, which is caused by complex multilevel micro-nanostructure, reflects the mechanical properties and fracture mechanisms. It is of great significance to characterize some characteristic parameters from the fracture surfaces of bone. In this research, anisotropic fracture mechanical properties of bovine femoral cortical bone along transverse, longitudinal and radial direction are firstly obtained by three-point bend experiment. Then the fracture routes and fracture surfaces are observed by scanning electron microscope. The observation shows that the formed fracture surfaces, which are caused by different crack routes, are extremely rough and have complex textures. Lastly, the combined method of fractal and gray level co-occurrence matrix are adopted to describe the morphology of fracture surface of cortical bone objectively and quantitatively. It is shown that the fracture surface of cortical bone has obvious fractal characteristics and four statistical texture feature parameters (contrast,angular second moment, correlation and entropy) of GLCM of fracture surfaces can describe a certain fracture texture character. The relationship between the characteristic parameters and macroscopic mechanical properties are established. The quantitative analysis and automatic class identification for the fracture surfaces of cortical bone can be achieved.

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Effect of the atomic size distribution on glass forming ability of amorphous metallic alloys

Materials Research Bulletin ◽

10.1016/s0025-5408(01)00715-2 ◽

2001 ◽

Vol 36 (12) ◽

pp. 2183-2198 ◽

Cited By ~ 334

Author(s):

O.N. Senkov ◽

D.B. Miracle

Keyword(s):

Size Distribution ◽

Glass Forming Ability ◽

Metallic Alloys ◽

Atomic Size ◽

Amorphous Metallic Alloys ◽

Glass Forming

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Multicycle electroimpulse fatigue of amorphous metallic alloys

Journal of Physics Conference Series ◽

10.1088/1742-6596/1115/5/052016 ◽

2018 ◽

Vol 1115 ◽

pp. 052016

Author(s):

V A Fedorov ◽

T N Pluzhnikova ◽

A D Berezner

Keyword(s):

Metallic Alloys ◽

Amorphous Metallic Alloys

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Radiation Effects in Amorphous Metallic Alloys as Revealed by Mössbauer Spectrometry: Part II. Ion Irradiation

Metals ◽

10.3390/met11081309 ◽

2021 ◽

Vol 11 (8) ◽

pp. 1309

Author(s):

Marcel Miglierini

Keyword(s):

Heavy Ions ◽

Radiation Effects ◽

Ion Irradiation ◽

Active Regions ◽

Mössbauer Spectrometry ◽

Metallic Alloys ◽

Conversion Electrons ◽

Amorphous Metallic Alloys ◽

Mossbauer Spectrometry ◽

Light Ions

Due to their excellent magnetic properties, amorphous metallic alloys (AMAs) are considered for the construction of magnetic cores of radio-frequency cavities in accelerators. Here, they might be exposed to ion bombardment. The influence of irradiation by both light and heavy ions featuring low and high energies, respectively, is followed by the techniques of 57Fe Mössbauer spectrometry. Modifications of surface layers in selected Fe-containing AMAs after ion irradiation are unveiled by detection of conversion electrons and photons of characteristic radiation whereas those in their bulk are derived from standard transmission spectra. Rearrangement of microstructure which favors the formation of magnetically active regions, is observed in surface regions bombarded by light ions. Heavy ions caused pronounced effects in the orientation of net magnetization of the irradiated samples. No measurable impact upon short-range order arrangement was observed. Part I of this paper is devoted to radiation effects in Fe-based AMAs induced by neutron irradiation.

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