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Meeting Materials Science & Technology 2020
Symposium Interfaces and Phase Transformations
Presentation Title Localized Phase Transformation at Interfaces – A New Alloy Design Strategy
Author(s) Longsheng Feng, Ashton Egan, Qianglong Liang, Yipeng Gao, Michael Mills, Yunzhi Wang
On-Site Speaker (Planned) Yunzhi Wang
Abstract Scope Homophase and heterophase interfaces in materials have been engineered well over a century through various simple and sophisticated processing techniques to achieve special properties. In structural materials, these interfaces have been utilized effectively to regulate dislocation, twinning and cracking activities and hence to control the strengthening and toughening behaviors. In this presentation, however, we will show a different way of utilizing these interfaces in alloy design. In particular, by using a combination CALPHAD, phase transition graph (PTG) and phase-field approaches, we demonstrate how homophase interfaces such as stacking faults and deformation twin boundaries alter phase equilibria and harbor localized phase transformations, which allows one to achieve superior high-temperature work-hardening ability and creep performance in Ni-base superalloys, and ultralow modulus and non-hysteretic and linear superelasticity in NiTi shape memory alloys. This work is supported by NSF/DMREF program and DOE/BES program.
Proceedings Inclusion? Undecided

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

A Phase Field Dislocation Dynamics Model in Heterogeneous Crystalline Media
Computing the Free Energy and Mobility of Cylindrical Interfaces
Localized Phase Transformation at Interfaces – A New Alloy Design Strategy
Microstructure and Mechanical Properties of Pre-aged Thermo-Mechanically Processed NiTiHf Shape Memory Alloy
Phase Transformations in High-Temperature Industrial Applications: An Experimental and Computational Study of Nitridation in Commercial Austenitic Stainless Steel
Refining Alpha Microstructure via Dual-phase Interface and Twin Boundary in Beta Titanium Alloys
Shear-mediated Interfacial Structure Evolution in Nanoscale FCC Gold
Study of Strain Rate and Temperature Dependent Behavior of Pseudo-morphic bcc Mg within the Mg/Nb Nanocomposites

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