About this Abstract |
Meeting |
MS&T21: Materials Science & Technology
|
Symposium
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Additive Manufacturing of Metals: Microstructure, Properties and Alloy Development
|
Presentation Title |
Avoiding Deleterious Phase Formation in Abrupt Interface Bonding of Multi-material Structures |
Author(s) |
Nicholas Jones, Jack Beuth, Maarten de Boer |
On-Site Speaker (Planned) |
Nicholas Jones |
Abstract Scope |
Multi-material additive manufacturing allows for the fabrication of a wide range of functional structures, but care must be taken to account for crystal structure incompatibility between alloys. Intermetallics, oxides, carbides, and other brittle phases often form when joining dissimilar materials. Often this results in cracking, delamination, and mechanical failure at the bond between metals. In this work, we identify several key methods to avoid deleterious phase formation in multi-material fabrication. Thermodynamic simulations utilizing the CALPHAD method are performed to identify possible phases to avoid in processing before experimentation. Several fabrication methods are tested via directed energy deposition processing, producing defect-free material interfaces. Microscopy and compositional analysis are performed at material interfaces to verify phase predictions. Heat treatments are also done to determine the sensitivity of material interfaces to thermal cycling and high temperature applications. |