| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
2025 Technical Division Student Poster Contest
|
| Presentation Title |
SPU-32: High Entropy Lead-Free, Free Machining Brass with Calcium |
| Author(s) |
Julien Luu, Isaiah Jeter, Alejandro Trujillo, Aurora Pribram-Jones, Jane Yang, Lori Bassman, Kevin Laws |
| On-Site Speaker (Planned) |
Julien Luu |
| Abstract Scope |
The severe health impacts of lead contamination in drinking water have prompted efforts and government legislation to eliminate leaded brasses used in many drinking water systems globally. A new family of high-entropy brass-like alloys in the Cu-Mn-Zn-Al-[Ca] system has been developed as a candidate lead-free, free machining brass. The microstructures contain a face-centered cubic solid solution matrix and an intermetallic compound, Cu5Ca, which forms within both the as-cast state and upon short homogenization heat treatments. Cu5Ca was found to provide favorable chip-breaking properties, indicating good machinability. An increase in the percentage of calcium in the alloy was found to increase the volume fraction of Cu5Ca, which in turn increased both the hardness and the machinability of the alloys. However, the inclusion of calcium made alloys susceptible to self-permeating oxidation and reactivity during melt processing and the solidified casting. |
| Proceedings Inclusion? |
Undecided |
| Keywords |
High-Entropy Alloys, Characterization, Other |