Strengthening and Nanostructure of Metals and Alloys
Computer simulations of strengthening of materials by nano-scale particles
The high strength of many structural materials derives from nano-scale particles of secondary phases. These
particles hinder the glide of dislocations and thus raise the strength of the materials. The planar glide of
dislocations - perfect or dissociated ones - in materials strengthened by nano-scale particles is
simulated in computers. In contrast to most other investigations in this field i) realistic three dimensional
particle arrays are studied and ii) the flexibility of dislocations is modelled on the basis of Brown's
concept of the dislocation's self-interaction, i. e. the dislocation line tension approach is not followed.
Hence even dislocation glide in peak- and overaged materials can be correctly simulated. Two types of particles
have been treated: a) incoherent particles surrounded by a strain field, b) coherent long-range
ordered precipitates.
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