Microstructure hierarchy - Mechanical property relationship for hypereutectic Al-Si alloy powders solidified far from equilibrium

Date

2006-12-01

Author

Kalay, Yunus Eren
Chumbley, L.s.

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Microstructural selection in aluminum silicon powder alloys can directly influence the consolidated materials' mechanical properties. However, due to processing and characterization difficulties, a complete understanding of powder microstructure as a function of undercooling and solidification velocity, and the role microstructure plays on mechanical properties, remains an elusive goal. In this study high pressure gas atomization processing was used to produce rapidly solidified hypereutectic Al-Si alloys. Scanning and transmission electron microscopy have been used to determine the hierarchy of different microstructures. Four different microstructure types, namely, microcellular, dendritic aluminum, coupled eutectic, and primary silicon, have been observed at different undercoolings. Warm extrusion of closelygrouped particle sizes where a given microstructure type dominated was used to generate nearly full density consolidated samples that were machined to tensile specimens. The results of tensile strength measurements are reported for these samples.

Subject Keywords

Aluminum Silicon Powder , Consolidated Materials , High Pressure Gas Atomization , Hypereutectic Al-Si Alloys , Rapidly Solidified, Scanning And Transmission Electron Microscopy , Solidification Velocity, Tensile Specimens

URI

https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84883367159&origin=inward
https://hdl.handle.net/11511/84535

Conference Name

2006 International Conference on Powder Metallurgy and Particulate Materials, PowderMet 2006 (18 - 21 Haziran 2006)

Collections

Department of Metallurgical and Materials Engineering, Conference / Seminar

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Citation Formats

Y. E. Kalay and L. s. Chumbley, “Microstructure hierarchy - Mechanical property relationship for hypereutectic Al-Si alloy powders solidified far from equilibrium,” San Diego, CA, Amerika Birleşik Devletleri, 2006, p. 1095, Accessed: 00, 2021. [Online]. Available: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84883367159&origin=inward.