About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
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Symposium
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Materials Design and Processing Optimization for Advanced Manufacturing: From Fundamentals to Application
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Presentation Title |
FeNiMnAl(Cr) and FeCoMnAl Multi-principal Component Alloys |
Author(s) |
Ian Baker |
On-Site Speaker (Planned) |
Ian Baker |
Abstract Scope |
In the 1970’s, Strutt and Polvani showed that a semi-coherent B2/L21 NiAl-Ni2AlTi alloy had superior creep properties compared to Ni-based superalloys. Based on these observations, we embarked in 2004 on developing high-strength two-phase multi-principal component alloys (MPCAs) based on FeNiMnAl and FeCoMnAl. Four different microstructures were produced in FeNiMnAl MPCAs: 1) ultrafine (5-50 nm) B2/L21 or b.c.c./B2 <100>-aligned microstructures in near-equiatomic FeNiMnAl; 2) fine (50-70 nm) f.c.c./B2 eutectoid microstructures in Ni and Al-lean MPCAs; 3) coarser (0.5-1.5 µm) f.c.c./B2 lamellar eutectic microstructures in MPCAs with ≤15 at.% Al; and 4) single-phase MPCAs such as Fe40.4Ni11.3Mn34.8Al7.5Cr6. These alloys could be strong (yield strength ~2350 MPa), or ductile (>50% elongation), but not both. FeCoMnAl MPCAs, which were B2, B2/f.c.c., B2/h.c.p. or B2/L21, were very hard and brittle but some showed excellent soft magnetic properties and high stability to ~873 K. The microstructures and the resulting mechanical and magnetic properties are described. |
Proceedings Inclusion? |
Planned: |
Keywords |
High-Entropy Alloys, Magnetic Materials, Mechanical Properties |