Tailoring Mechanical Properties of a Multi-Principle-Element Alloy by a Multi-Length-Scale Approach

Conference · Mon Mar 24 04:00:00 EDT 2025

DOI:https://doi.org/10.2172/2536667· OSTI ID:2536667

Hung, Chang-Yu ^[1]; Heczko, Milan ^[2]; Li, Chenyang ^[3]; Barton, Dallin ^[4]; Jablonski, Paul ^[5]; Chen, Wei ^[3]; Devaraj, Arun ^[4]; Mills, Michael ^[2]; Detrois, Martin ^[5]; Antonov, Stoichko ^[5]

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1. NETL Site Support Contractor, National Energy Technology Laboratory
2. Ohio State University
3. State University of New York (SUNY) - Buffalo
4. Pacific Northwest National Laboratory (PNNL)
5. NETL

A multiscale strengthening approach was employed to tailor the mechanical properties of a NiCoCr-based multi-principal element alloy (MPEA). Initially, the addition of Mo was utilized to strengthen the alloys by achieving grain size refinement, severe lattice distortion, and a reduction in stacking fault energy (SFE). Subsequently, the Suzuki segregation phenomenon was leveraged by carefully controlling stacking fault (SF) density via pre-straining and a subsequent 500°C heat treatment. Consequently, the Mo-added MPE alloys that were pre-strained and subsequently heat-treated exhibited a true yield stress of 2.3 GPa, with a corresponding fracture elongation of 12%. The Mo promotes complex SF interactions and the SFs formed during prior straining serve as sites for Suzuki segregation during subsequent heat treatment, varying the local SFE with Cr segregation, creating a roughened landscape and hindering dislocation dynamics. This multiscale strengthening approach presents a promising route for achieving desired mechanical properties in MPEAs.

• Research Organization: National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)
• Sponsoring Organization: USDOE Office of Fossil Energy and Carbon Management (FECM); USDOE Office of Fossil Energy and Carbon Management (FECM), Office of Carbon Management (FE-20)
• OSTI ID: 2536667
• Country of Publication: United States
• Language: English

Related Subjects

mechanical properties
multi principle element alloy
suzuki segregation
transmission electron microscopy