| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Composite Materials for Sustainable and Eco-Friendly Material Development and Application
|
| Presentation Title |
Friction Extrusion of Lead-free Brass-graphite Composites Made from Powder Feedstock |
| Author(s) |
Md Reza-E-Rabby, Aditya Nittala, Mayur Pole, Todd Kidder, Steffen Sigloch, Keerti Kappagantula |
| On-Site Speaker (Planned) |
Md Reza-E-Rabby |
| Abstract Scope |
Currently, “lead-free” brass alloys (like C27450/C27451/C6930), used extensively in drinking water fixtures and automotive, electrical, and electronic applications contain maximum 0.25% lead to maintain mechanical performance and machinability. Adding graphite to brass as an alternative to lead, using casting, powder metallurgy, and extrusion methods, has been explored previously. However, all these methods have proven to be energy-, time-, and resource-intensive, while not enabling performance equivalent to that of C36000 brass. In this presentation, we demonstrate a one-step approach using friction extrusion to make lead-free brass/graphite components with mechanical performance equivalent to C36000. Manufacturing temperatures were maintained <600 °C and the average grain size in longitudinal direction of pure brass and brass-graphite composite wires were 2.8 μm and ~1 μm respectively. Our results show that the sub-micron graphite plays an important role in limiting process temperature and restraining grain growth during friction extrusion, thus reducing grain size in composites. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Composites, Powder Materials, Process Technology |