Structural Reliability of Brittle Materials at High Temperatures.

1984 ◽  
Author(s):  
S. M. Wiederhorn ◽  
N. J. Tighe ◽  
T. J. Chuang ◽  
K. A. Hardman-Rhyne ◽  
B. J. Hockey
Keyword(s):  
High Temperatures ◽  
Structural Reliability ◽  
Brittle Materials

An Experimental Study on Brazing of Diamonds onto Thin Steel Wires

2010 ◽  
Vol 443 ◽  
pp. 537-542 ◽  
Author(s):  
Guo Qing Zhang ◽  
Hui Huang ◽  
Xi Peng Xu
Keyword(s):  
Mechanical Properties ◽  
Experimental Study ◽  
Experimental Investigation ◽  
Cross Section ◽  
High Temperatures ◽  
Brittle Materials ◽  
The Body ◽  
Natural Stone ◽  
Steel Wires ◽  
Thin Steel

An experimental investigation was carried out to braze diamond abrasives onto thin steel wires, in which case the brazing was conducted in the vacuum and under high temperatures by using a nickel-based powder as brazing alloy. The morphologies and microstructures of the brazed wires were observed and the comprehensive mechanical properties of the brazed wires were tested. The brazed wires were also used to cut such brittle materials as ceramics, glass, and natural stone. It is shown that a typical phenomenon of brazing alloy’s climbing around the diamond grains was observed in brazing the wires. Through observing the cross-section of brazed wires, it is observed that there is a good bonding between the brazing alloy and the body of steel wires. The crystal grains of the steel wires grew significantly after brazing. Through observing the morphologies of the diamond wires and the surfaces of four workpiece materials, few diamond pull-outs were found on the wires and the kerfs on the workpiece materials were basically flat.

scholarly journals Brittle Materials in Mechanical Extremes

Materials ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 4610
Author(s):  
Giovanni Bruno
Keyword(s):  
Mechanical Properties ◽  
Mechanical Behavior ◽  
High Temperatures ◽  
3D Imaging ◽  
Construction Materials ◽  
Brittle Materials ◽  
Structural Ceramics ◽  
Special Issue ◽  
The Road ◽  
Very High

The goal of the Special Issue “Brittle Materials in Mechanical Extremes” was to spark a discussion of the analogies and the differences between different brittle materials, such as, for instance, ceramics and concrete. Indeed, the contributions to the Issue spanned from construction materials (asphalt and concrete) to structural ceramics, reaching as far as ice. The data shown in the issue were obtained by advanced microstructural techniques (microscopy, 3D imaging, etc.) and linked to mechanical properties (and their changes as a function of aging, composition, etc.). The description of the mechanical behavior of brittle materials under operational loads, for instance, concrete and ceramics under very high temperatures, offered an unconventional viewpoint on the behavior of brittle materials. This is not at all exhaustive, but a way to pave the road for intriguing and enriching comparisons.

scholarly journals Высокоскоростное взаимодействие металлической струи с керамикой

2020 ◽  
Vol 46 (17) ◽  
pp. 10
Author(s):  
Б.В. Румянцев ◽  
С.И. Павлов
Keyword(s):  
Electron Microscopy ◽  
Phase Transformations ◽  
Thermodynamic Parameters ◽  
High Temperatures ◽  
Initial Velocity ◽  
High Speed ◽  
Brittle Materials ◽  
The State ◽  
Residual Cavity

The destabilization of a cumulative jet with an initial velocity of more than 8 km / s when penetrated into brittle materials is studied. Using electron microscopy, the state of residual materials in the cavity is analyzed. The observed phase transformations of copper and brittle materials in the residual cavity indicate high temperatures in the penetration region and reveal the influence of the thermodynamic parameters of interacting materials on the destabilization of high-speed penetration.

A Simultaneous Loading System to Evaluate the Structural Reliability of Brittle Materials

1995 ◽  
Vol 78 (8) ◽  
pp. 2251-2253
Author(s):  
Akira Kishimoto ◽  
Kazuhito Sugai ◽  
Yoshinobu Nakamura ◽  
Naobumi Motohira ◽  
Hiroaki Yanagida
Keyword(s):  
Structural Reliability ◽  
Brittle Materials ◽  
Loading System ◽  
Simultaneous Loading

Application of TEM to Deformation, Wear, and Fracture of Ceramics

1974 ◽  
Vol 32 ◽  
pp. 472-473
Author(s):  
B. J. Hockey
Keyword(s):  
Wear Resistance ◽  
High Temperature ◽  
Mechanical Behavior ◽  
Brittle Materials ◽  
High Temperature Strength ◽  
Wide Range ◽  
Corrosive Environments ◽  
Further Development

Ceramics, such as Al2O3 and SiC have numerous current and potential uses in applications where high temperature strength, hardness, and wear resistance are required often in corrosive environments. These materials are, however, highly anisotropic and brittle, so that their mechanical behavior is often unpredictable. The further development of these materials will require a better understanding of the basic mechanisms controlling deformation, wear, and fracture.The purpose of this talk is to describe applications of TEM to the study of the deformation, wear, and fracture of Al2O3. Similar studies are currently being conducted on SiC and the techniques involved should be applicable to a wide range of hard, brittle materials.

In situ REM imaging of surface processes on ceramic bulk crystals from 300 to 1670 K in a conventional TEM

1991 ◽  
Vol 49 ◽  
pp. 660-661
Author(s):  
Z. L. Wang ◽  
J. Bentley
Keyword(s):  
High Temperatures ◽  
Image Resolution ◽  
Atomic Processes ◽  
Crystal Surfaces ◽  
Beam Radiation ◽  
Surface Areas ◽  
Transmission Electron ◽  
Reflection Electron Microscopy ◽  
Gas Reactions

Studying the behavior of surfaces at high temperatures is of great importance for understanding the properties of ceramics and associated surface-gas reactions. Atomic processes occurring on bulk crystal surfaces at high temperatures can be recorded by reflection electron microscopy (REM) in a conventional transmission electron microscope (TEM) with relatively high resolution, because REM is especially sensitive to atomic-height steps.Improved REM image resolution with a FEG: Cleaved surfaces of a-alumina (012) exhibit atomic flatness with steps of height about 5 Å, determined by reference to a screw (or near screw) dislocation with a presumed Burgers vector of b = (1/3)<012> (see Fig. 1). Steps of heights less than about 0.8 Å can be clearly resolved only with a field emission gun (FEG) (Fig. 2). The small steps are formed by the surface oscillating between the closely packed O and Al stacking layers. The bands of dark contrast (Fig. 2b) are the result of beam radiation damage to surface areas initially terminated with O ions.

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