Session: 10-01 Interactive Presentations

Paper Number: 100286

100286 - Prediction of the Effects of Structural Parameters on Overall Properties of Sac Lead Free Solder Alloys 

Lead-free SAC solder alloys are composed of β-Sn, Ag, and Cu.  In SAC305, almost 97% weight of the overall material is β-Sn, which is a polycrystalline material with multiple grains, as verified by electron backscattered microscope (EBSD) images.  Grains are developed by beta-tin matrix with embedded intermetallic (IMC) particles.  As a result, SAC materials deform in a particular fashion under the application of external loads which is governed by crystal slip systems.  Depending on β-Sn grain orientations and quantitative properties of IMC particles, overall mechanical properties of SAC alloys vary.  Therefore, a numerical approach needs to be investigated to explain the effects of material microstructural parameters on overall properties of SAC alloys. 

The objective of this study was to implement a crystal plasticity constitutive framework based on the software package DAMASK that assesses the effects of material structural parameters (such as grain size, grain orientation, IMC volume percentage, and IMC particle size) on localized and overall deformation behavior.  At first a micromechanical polycrystal model was generated for β-Sn body-centered tetragonal (BCT) crystals that included IMC particles.  Grain morphology, grain orientations, and quantitative properties of IMC particles were obtained from SEM-EBSD experiments and hence, an analogous polycrystal model were generated.  Then the model was applied several times, and a material structure-property relationship for SAC alloys was determined based on machine learning.

Presenting Author: Debabrata Mondal Auburn University