8-12 July 2013
Africa/Johannesburg timezone
<a href="http://events.saip.org.za/internalPage.py?pageId=13&confId=32"><font color=#ff0000>SAIP2013 PROCEEDINGS AVAILABLE</font></a>

Evaporation models for segregation

9 Jul 2013, 17:40
1h
Poster Presentation Track A - Division for Condensed Matter Physics and Materials Poster1

Speaker

Mr Shaun Cronje (UFS)

Abstract content <br> &nbsp; (Max 300 words)

The search for alloys with better material properties such as strength, wear and corrosion resistance continues to this day. In addition to these desirable properties, the search for ways to reduce production costs and time has led to a large amount of research being conducted on the processes which determines the material properties of metals and alloys. An important one of these processes is segregation. Surface segregation is commonly regarded as the redistribution of solute atoms between the surface and the bulk of the material, resulting in a solute surface concentration that is generally higher that the solute bulk concentration. To improve the interpretation of segregation data the influence of surface evaporation should be considered. In spite of the immense scientific and technological importance of evaporation, this ubiquitous phenomenon is not well understood from a fundamental point of view. Currently there are three theoretical approaches to study evaporation: Continuum Mechanics, Classical Kinetic Theory and recently Statistical Rate Theory. As part of the development of a model to simultaneously predict segregation and surface evaporation, these three evaporation models will be discussed. In addition predictions obtained from various evaporation models will be compared to experimental data of pure elemental evaporation as measured in a modified Auger system containing a quartz crystal resonator.

Level for award<br>&nbsp;(Hons, MSc, <br> &nbsp; PhD)?

PhD

Main supervisor (name and email)<br>and his / her institution

Wiets Roos UFS

Apply to be<br> considered for a student <br> &nbsp; award (Yes / No)?

yes

Would you like to <br> submit a short paper <br> for the Conference <br> Proceedings (Yes / No)?

Yes

Primary author

Co-authors

Dr J.K.O. Asante (Department of Physics TUT, Pretoria, South Africa) Dr R.E. Kroon (Department of Physics, UFS, Bloemfontein, South Africa) Prof. W.D. Roos (Department of Physics, UFS, Bloemfontein, South Africa)

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