About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
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Symposium
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Additive Manufacturing: Advanced Characterization with Synchrotron, Neutron, and In Situ Laboratory-scale Techniques III
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Presentation Title |
Creep Behavior of an Additively Manufactured Al-Ce-Ni-Mn-Zr Alloy Measured via In Situ Neutron Diffraction |
Author(s) |
Sumit Bahl, Tiffany Wu, Richard A Michi, Ke An, Dunji Yu, Lawrence Allard, Jovid Rakhmonov, Jonathan D. Poplawsky, Christopher Fancher, David C. Dunand, Alex Plotkowski, Amit Shyam |
On-Site Speaker (Planned) |
Sumit Bahl |
Abstract Scope |
The creep behavior of an additively manufactured Al-Ce-Ni-Mn-Zr multicomponent eutectic alloy is investigated. The alloy exhibits exceptional creep resistance in the 300 – 400 °C temperature range due to high-volume fraction (~ 27 vol%) of thermally stable (Ce, Ni)-rich dispersoid phase finely distributed with sub-100 nm inter-dispersoid spacing. Orowan strengthening and load transfer from the matrix to the dispersoid are key strengthening mechanisms in a dispersion strengthened alloy. In situ neutron creep experiments provide a direct means to measure load transfer between the matrix/dispersoid phases. Unexpectedly, dispersoids in the Al-Ce-Ni-Mn-Zr alloy are observed to shed load to softer Al matrix during creep at lower stresses and the load shedding is more pronounced with increased creep temperature, resulting in reduced load transfer strengthening. The high creep resistance of the alloy despite reduced load transfer strengthening is therefore due to high Orowan strengthening from the fine distribution of thermally stable dispersoids. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Aluminum, Mechanical Properties |