OVERVIEW

• Phase Field Method
  • Introduction
  • Effect of Zener pinning and thermal grooving on grain growth
  • Grain growth in anisotropic systems
  • Diffusion and coarsening in multi-phase systems and multi-component systems solder joints
• Calculation and Optimization of Phase Diagrams (CALPHAD)
  • Calculation of phase diagrams for lead-free solder alloys based on Bi-In-Sn-Zn
  • Al-Fe-Ni-Ti system
• Previous Projects
  • In-situ Obervation Of Microstructure Evolution With Confocal Laser Scanning Microscopy (CLSM)
  • Ex-situ pO2-measurements of non-ferrous slacs
  • MOKE (Magneto Optical Kerr Effect) - measurements of soft magnetic materials

 

CALCULATION AND OPTIMIZATION OF PHASE DIAGRAMS

Calculation of phase diagrams for lead-free solder alloys based on Bi-In-Sn-Zn

A thermodynamic database was developed and phase diagrams were calculated for Bi-In-Sn-Zn alloys according to the CALPHAD (CALculation of PHAse Diagrams) method. Thermodynamic parameters for all phases have been optimized using experimental data from the literature. The resulting database can be a powerful tool in the development of lead-free Bi-In-Sn-Zn soldering alloys. It enables the calculation of solidus and liquidus temperatures, phase compositions and fractions and thermodynamic properties. Furthermore, related properties, such as surface tension and viscosity, were predicted from the thermodynamic descriptions.

Vertical section at 0.05 wt% Sn of the Bi-Sn-Zn system

• Thesis text (in Dutch): Berekenen van fasediagrammen voor loodvrije soldeerlegeringen op basis van Bi-In-Sn-Zn
• Summary (in Dutch)
• Publications
  • Thermodynamic optimization of the lead-free solder system Bi-In-Sn-Zn
  • Berekenen van fasediagrammen voor loodvrije soldeerlegeringen op basis van Bi-In-Sn-Zn (in Dutch)
• Poster presentation at CALPHAD XXXII (La Malbaie, Quebec, Canada, May 25-30, 2003)
• Involved in COST-531 on lead-free soldering

Al-Fe-Ni-Ti system

• Involved in COST-535: THermodynamics of Alloyed ALUminides (THALU)
  • Poster presentation at TOFA2004 (Vienna, Austria, September 12-17, 2004)
  • Diffusion couple experiments in Al-Ni-Ti
    • Thesis work of A. Serbruyns (MTM, KULeuven) in collaboration with A. A. Kodentsov (TUEindhoven) and assisted by J. Dekeyzer (MTM, KULeuven) and myself, August 2005 - June 2006