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Meeting 2020 TMS Annual Meeting & Exhibition
Symposium Microstructural Template Consisting of a Face-Centered Cubic Matrix with Ordered Precipitates: Microstructural Evolution and Properties
Presentation Title Precipitation and Deformation Mechanisms of γ’/γ” Co-precipitates in Alloy 718
Author(s) Hariharan Sriram, Kamal Kadirvel, Rongpei Shi, Longsheng Feng, Michael J Mills, Yunzhi Wang
On-Site Speaker (Planned) Yunzhi Wang
Abstract Scope Alloy 718, widely used in aerospace and power industries, is strengthened by both γ’ (L12) and γ” (D022) intermetallic phases that are coherently embedded in a γ (FCC) phase matrix. Experimental characterizations have revealed a rich variety of γ’/γ” co-precipitate microstructures and puzzling deformation microstructures. We present a simulation study of the nucleation, growth and coarsening mechanisms associated with the formation and stability of such γ’/γ” co-precipitates, as well as their deformation mechanisms, in contrast to those of individual precipitates, using a combination of CALPHAD, ab initio, and phase-field approaches. Co-precipitation is found energetically favorable during nucleation because of the synergistic effect in reducing the coherency elastic strain. Co-precipitates have significantly different growth and coarsening behaviors, and their deformation mechanisms are extremely complicated. This work is supported by DOE/NETL.
Proceedings Inclusion? Planned: Supplemental Proceedings volume


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