Biomedical subjects

D Caillard

Publications and source records attributed to D Caillard.

3 recordsLinked to original sources

PubMed2001

Dislocation mobility and electronic effects in semiconductor compounds.

In situ transmission electron microscopy experiments provide a unique way to investigate in real time the dislocation behaviour at a microscopic scale and to decide which elementary process controls the dislocation glide in semiconductors. In this review the experimental results obtained on different semiconductors are presented and discussed. Particular attention is devoted to the radiation-enhanced glide process.

Journal Article↗

PubMed2001

In situ observations of unusual dislocation mechanisms in the intermetallic alloy Ti3Al.

In situ straining experiments in a transmission electron microscope have been carried out on a Ti3Al intermetallic alloy, with the aim of determining the microscopic mechanisms controlling glide in prism, basal and pyramidal planes. Five different antiphase boundary energies have been measured and compared with the corresponding densities of incorrect first nearest neighbour atoms. The determination of a tension-compression asymmetry in pyramidal slip, and the detailed analysis of the complex microscopic mechanisms involved illustrate the efficiency of in situ experiments to solve complex problems in plasticity. A comparison between the properties of the different slip systems shows that they are controlled by different microscopic mechanisms, none of them being of covalent origin.

Journal Article↗

PubMed2001

Quantitative measurements in in situ straining experiments in transmission electron microscopy.

Several examples of recent studies by in situ straining experiments in a transmission electron microscope performed in the Toulouse group (France) are presented. In particular, quantitative measurements of the features of the dislocation motion are described. These examples deal with individual or collective propagation of dislocations, which are submitted to various types of obstacle. Different metallic materials are investigated: magnesium, intermetallics, aluminium alloys and gamma phase of a superalloy.

Journal Article↗