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Development of new Co-based superalloys utilizing ICME-based approaches

题目/TitleDevelopment of new Co-based superalloys utilizing ICME-based approaches

报告人/SpeakerDr. Michael S. Titus, Assistant Professor

报告人工作单位/AffiliationDepartment of Materials Engineering,

Purdue University (普渡大学)

日期/Date201858(期二)May 8 (Tuesday), 2018

时间/Time2:30 - 4:00 PM

联系人/Contact冯强 教授(邹敏,zoumin_1200@163.com

报告地点/Location北京科技大学主楼 353, 353 Main BuildingUSTB

报告摘要/Abstract

      Since the discovery of the metastable γ’-Co3(Al,W) phase of L12 (ordered fcc) crystal structure, development of new γ’-strengthened Co-based alloys has moved extremely quickly when compared to development cycles of years past. This talk will focus on the development of new γ’-strengthened Co-based superalloys for single crystal high pressure turbine blade components in gas turbine engines and will focus on the maximization of the γ’-solvus temperature and γ’ superlattice intrinsic stacking fault (SISF) energy. Through use of the CALPHAD method for phase equilibria calculations, the γ’-solvus can be optimized through a balance of Ni, Al, W, Ta, Nb, and Ti additions. First-principles calculations utilizing density functional theory can then determine the composition- and temperature-dependent SISF energies, which control the high temperature creep strength of this new class of alloys. The current state-of-the-art alloys will be presented alongside the path taken, through ICME-based approaches, to arrive at the current generation of Co-based superalloys.

作者简介/Speaker’s short biography

 Michael joined the School of Materials Engineering at Purdue University as an Assistant Professor in December 2016. Michael completed his B.S. in Engineering (The Ohio State University) in 2010 and Ph.D. in Materials (University of California Santa Barbara) in 2015. From 2015 to 2016 he was an Alexander von Humboldt Postdoctoral Fellow at the Max Planck Institute for Iron Research in Dusseldorf, Germany. Michael has co-authored 15 peer-reviewed journal articles and contributed more than 15 presentations at conferences since 2012. Michael’s current research interests include understanding complex deformation mechanisms in structural alloys at elevated temperatures, quantification of defect structure and chemistry through advanced electron microscopy and first-principles calculations, and the accelerated discovery and development of structural alloys through an integrated, high-throughput experimental, thermodynamic modeling, and first-principles calculations approach.