1. How can computational simulation and modeling be used to create lead-free alloys? Tameka Whitney W.W. Samuell HS, Dallas ISD Faculty Mentor: Raymundo Arroyave, Ph.D. Assistant Professor, Department of Mechanical Engineering

2. Meet Dr. Raymundo Arroyave Assistant Professor in the Department of Mechanical Engineering at Texas A & M University; joined the A&M faculty in 2006. Ph.D. in Materials Science from the Massachusetts Institute of Technology (MIT) Postdoctoral Scholar in the Department of Materials Science and Engineering at Pennsylvania State University

3. Computational Materials Science Its objective is to develop theories and methods to simulate the behavior of materials across time and length scales.

4. Computational Materials Science CMS practitioners use different computational simulation tools that model the behavior of materials at the macro-level.

5. Why is CMS important? Provides the “recipe” for creating a substance without using experimentation Simulate structural, mechanical & thermal properties

6. Dr. Arroyave’s Lab… Focuses on developing models, predicting material properties and assisting materials design using computer simulation and modeling software

7. Soldering Use of metal alloys in order to join 2 or more components

8. Soldering Majority of solders have been lead- tin alloys Reliable Inexpensive Relatively low melting temperatures

9. Lead-Free Soldering Uses copper-tin alloy instead of the typical tin- lead solder

10. Why is it important? Concern about environmental impact of discarded lead-containing products leak into groundwater from landfills pollutes air if incinerated

11. Where do I fit in? My role is to generate data on copper-tin based alloys that may be used in the soldering process Structural properties

12. In a nutshell…. Materials Science studies the relationship between the structure of a substance and its properties. Because of increased controls and legislation on the use of lead, lead-free alloys must be developed to be used in the soldering process. Besides Dr. Arroyave’s group, only 2 other groups in the US are researching lead-free alloys.

13. How can I use this in my classroom? Have students create a crystal of Cu 3 Sn using provided materials Types of bonding found in crystals (metallic, ionic) and the properties that result

14. Special Thanks E 3 Team Dr. Raymundo Arroyave Min Soo Park Colton Shannon National Science Foundation (NSF) Nuclear Power Institute (NPI) Texas Workforce Commission (TWC) Chevron