| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Solid-State Phase Transformations and Microstructural Evolution
|
| Presentation Title |
Constituent Phases and Microstructure of Cu-10Sn Alloy Produced by Laser Powder Bed Fusion |
| Author(s) |
Le Zhou, Binghao Lu, Holden Hyer, Abhishek Mehta, Sun Hong Park, Yongho Sohn |
| On-Site Speaker (Planned) |
Le Zhou |
| Abstract Scope |
Cu-10Sn alloys were additively manufactured by laser powder bed fusion. With constant hatch spacing of 0.12 mm and slice thickness of 0.03 mm, near full density of Cu-10Sn alloys could be produced using appropriate laser power and scan speed (200 – 350 W and 500 – 1000 mm/s). When the scan speed decreased, the fraction of porosity increased due to the keyhole melting associated with excessive energy density. The melt pool depth and width increased when the laser power increased or the scan speed decreased. The grains within the top melt pool layer, which was last to solidify, exhibited a fan-like structure, whereas all other areas had small columnar grains aligned parallel to the build direction. The α-Cu dendrites and interdendritic δ-Cu41Sn11 phase was observed in all samples. In addition, formation of thin laths (~100 nm) was observed by TEM presumably due to martensitic transformation. |
| Proceedings Inclusion? |
Planned: |