Hillert Materials Modeling Colloquium series XVII: Designing Complex Metallic Alloys for Applications – by Human Intelligence

A reliable theory-guided design of novel metallic alloys is presented for clean-energy/power-generation applications, desired for harsh-environments (oxidation, corrosion, load), high operational temperatures (efficiency), and durability (turbine blades, manufacturing dies, hydrogen tolerance). While machine-learning (ML) and artificial-intelligence (AI) offer advances if physics-based, alloy theory combined with human intelligence offers significant simplifying insights and guiding principles, as will be discussed for strength, stability, and ductility.

Rapid and reliable theory-guided alloy design of refractory multi-principal-element alloys (RMPEAs) will be demonstrated, and confirmed by high-throughput synthesis and characterization, to accelerate by 50%+ alloy development, increase by 20%+ operational temperatures with desired properties (e.g., higher modulus and yield-strength, and enhance creep and oxidation resistance). One example designed ductile RMPEAs exhibits high-strength [150-250 MPa in tension at 1300 C], high melting [>2500 C], excellent creep rate [10X lower than Ni-based steel Haynes-282 at 1000 C]. The approach is general, such as designed lightweight additively manufactured MPE superalloys.

Lecturer

Professor Duane D. Johnson received PhD at University of Cincinnati, Ohio, in 1985. After a postdoc period in Washington and Bristol, he worked at Sandia National Laboratory for 9 years. He was Ivan Racheff Professor at University of Illinois between 1997-2010, become F. Wendell Miller Professor in 2010 and Anson Marston Distinguished Professor of Engineering in 2021, at Iowa State University.

Johnson is Faculty Scientist at Ames Laboratory since 2017, where he was Chief Technical Officer between 2010-2017 . Since 2003, he is Fellow of the American Physical Society, Member Elect (2005-2007) and Chair Elect (2008-2010) of the American Physical Society, Division of Computations Physics. He has several hundreds of high profile scientific publications and received 14000 citations on his works (h-index 59).

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