Journal ArticleDOI
Characteristics of creep deformation in ceramics
TLDR
In this article, the authors reviewed the creep mechanisms in ceramics and compared experimental data, showing that there are three major types of creep behavior: a stress exponent close to 5 due to control by dislocation climb and fully ductile behaviour; a stress expander close to 3 due to controlling by climb from Bardeen-Herring sources and less than jive interpenetrating independent slip systems; and a stress extraction close to 1 due to diffusion creep.Abstract:
The creep mechanisms in ceramics are reviewed briefly and then compared with experimental data. It is shown that there are three major types of creep behaviour: a stress exponent close to 5 due to control by dislocation climb and fully ductile behaviour; a stress exponent close to 3 due to control by climb from Bardeen–Herring sources and less than jive interpenetrating independent slip systems; and a stress exponent close to 1 due to diffusion creep. The role of interface reaction control and the transitions from diffusion to power law creep are also examined.MST/1389read more
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MonographDOI
Mechanical Behavior of Materials
TL;DR: A balanced mechanics-materials approach and coverage of the latest developments in biomaterials and electronic materials, the new edition of this popular text is the most thorough and modern book available for upper-level undergraduate courses on the mechanical behavior of materials as discussed by the authors.
Journal ArticleDOI
Material Properties of Titanium Diboride.
TL;DR: Using trend analysis, property relations, and interpolation methods, a coherent set of trend values for the properties of polycrystallineTiB2 is determined for a mass fraction of TiB2 ⩾ 98 % and a mean grain size of (9±1) µm.
Journal ArticleDOI
Deformation mechanism maps for feldspar rocks
Erik Rybacki,Georg Dresen +1 more
TL;DR: Deformation mechanism maps for feldspar rocks were constructed based on recently published constitutive laws for dislocation and grain boundary diffusion creep of wet and dry plagioclase aggregates.
Journal ArticleDOI
Influence of water fugacity and activation volume on the flow properties of fine‐grained anorthite aggregates
TL;DR: In this paper, triaxial creep experiments in a gas deformation apparatus at temperatures of 1000-1150°C, confining pressures of 100-450 MPa, and axial stresses of 10-400 MPa were performed to specify quantitatively the effect of pressure and water weakening on the flow strength of feldspar.
Journal ArticleDOI
Compressive creep behavior of Mo5Si3 with the addition of boron
TL;DR: In this paper, a three phase microstructure composed of Mo5Si3 (T1), Mo5 Si,B (T2), and a ternary Mo5(Si,B)3 (t2) phase was synthesized and evaluated at 1240-1320 °C and 120-180 MPa.
References
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Journal ArticleDOI
Diffusional Viscosity of a Polycrystalline Solid
TL;DR: In this article, it is suggested that mosaic boundaries and boundaries between grains of nearly the same orientation may not serve as sources or sinks of the diffusion currents, in which case the creep rate will depend only on the configuration of grain boundaries having a sizable orientation differen...
Journal ArticleDOI
A Model for Boundary Diffusion Controlled Creep in Polycrystalline Materials
TL;DR: In this article, the authors discussed the mechanism of creep in polycrystalline alumina based on the differences between the lattice and boundary diffusion models and showed that the boundary diffusion model is more stable than lattice diffusion model, while the grain size dependence and the numerical constant are greater.
Journal ArticleDOI
On grain boundary sliding and diffusional creep
Rishi Raj,M.F. Ashby +1 more
TL;DR: In this paper, the problem of sliding at a nonplanar grain boundary is considered in detail, and the results give solutions to the following problems: 1) How much sliding occurs in a polycrystal when neither diffusive flow nor dislocation motion is possible? 2) What is the sliding rate at a wavy or stepped grain boundary when diffusional flow of matter occurs? 3) How is the rate of diffusional creep in polycrystals in which grain boundaries slide? 4) how is this creep rate affected by grain shape, and grain boundary migration? 5)
Journal ArticleDOI
On the rheology of the upper mantle
R. L. Stocker,M. F. Ashby +1 more
TL;DR: In this article, an approximate constitutive relationship for fluid phase transport in a partial melt is derived, and a set of rheologic material constants for olivine (Fo85-Fo95) are derived from a combination of experimental data and empirical generalizations.
Journal ArticleDOI
Overview no. 48
TL;DR: In this article, a comprehensive review of toughness mechanisms in transformable brittle solids is presented, with primary emphasis on transformation toughening, although micro-cracks and deflection tougheng are also considered.