Publication

Reinforced silver chloride as a model material for the study of dislocations in metal matrix composites

Andreas Mortensen
1991
Journal Articles

Abstract

Silver chloride containing fibers, spheres and particles of irregular form is used as a model material to study plasticity in metal matrix composites. Matrix dislocations generated upon cooling by the mismatch of coefficient of thermal expansion between the matrix and the reinforcement are observed by transmission optical microscopy after decoration at room temperature by photodissociation of the matrix. The plastic zone around the fibers, spheres and particles takes two forms: (a) trains of coaxial prismatic dislocation loops punched into the matrix and (b) a plastic zone of irregular form containing partially resolved tangled dislocations. A relationship between the inclusion volume and the volume of the plastic zone around a spherical or cylindrical inclusion in a strain-hardening matrix is presented and compared with experimental data. This relationship is extended to particles of irregular form.

Official source

https://infoscience.epfl.ch/entities/publication/61788354-bc2e-4f83-89b2-6173ee4d3d88

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Andreas Mortensen
1991
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/61788354-bc2e-4f83-89b2-6173ee4d3d88

About this result

Related concepts (32)

Precipitation hardening

Precipitation hardening, also called age hardening or particle hardening, is a heat treatment technique used to increase the yield strength of malleable materials, including most structural alloys of aluminium, magnesium, nickel, titanium, and some steels, stainless steels, and duplex stainless steel. In superalloys, it is known to cause yield strength anomaly providing excellent high-temperature strength. Precipitation hardening relies on changes in solid solubility with temperature to produce fine particles of an impurity phase, which impede the movement of dislocations, or defects in a crystal's lattice.

Metal matrix composite

In materials science, a metal matrix composite (MMC) is a composite material with fibers or particles dispersed in a metallic matrix, such as copper, aluminum, or steel. The secondary phase is typically a ceramic (such as alumina or silicon carbide) or another metal (such as steel). They are typically classified according to the type of reinforcement: short discontinuous fibers (whiskers), continuous fibers, or particulates. There is some overlap between MMCs and cermets, with the latter typically consisting of less than 20% metal by volume.

Hardening (metallurgy)

Hardening is a metallurgical metalworking process used to increase the hardness of a metal. The hardness of a metal is directly proportional to the uniaxial yield stress at the location of the imposed strain. A harder metal will have a higher resistance to plastic deformation than a less hard metal. The five hardening processes are: The Hall–Petch method, or grain boundary strengthening, is to obtain small grains. Smaller grains increases the likelihood of dislocations running into grain boundaries after shorter distances, which are very strong dislocation barriers.

Related publications (2)

Reinforced silver chloride as a model material for the study of dislocations in metal matrix composites

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