About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Alloy Phase Transformations at Elevated Temperatures
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| Presentation Title |
Effect of Copper Addition on High-Temperature Mechanical Properties of Ni-Based multi-principal element Alloys |
| Author(s) |
Elyorjon Jumaev, Rakhmatjon Gaipov, Omon Sultonov, Amir Abidov, Farkhod Abdullaev, Ki Buem Kim |
| On-Site Speaker (Planned) |
Elyorjon Jumaev |
| Abstract Scope |
Two novel Ni-based multi-principal element alloys with compositions Ni₄₈(CrAlFe)₁₅Ti₇ (N4) and Ni₄₈(CrCuFe)₁₂.₅Al₇.₅Ti₇ (N6) were designed using Thermo-Calc software and produced by arc-suction casting. The predictions indicated that adding Cu favors a fully face-centered cubic (FCC) matrix. Consistent with this prediction, the N6 alloy (with Cu) showed a γ–γ′ (matrix–precipitate) microstructure without the brittle BCC phase observed in the Cu-free N4 alloy. N4 exhibited a dual-phase microstructure comprising FCC interdendrite along with BCC (B2) phase in the dendrites, whereas N6 showed an FCC interdendrite with finely dispersed γ′ (L1₂ ordered FCC) precipitates (~28 nm) and without BCC phase. As a result, the Cu-containing N6 alloy had slightly lower yield strength (≈596 MPa) than N4 (≈765 MPa) however, significantly improved plasticity. Both N4 and N6 alloys demonstrated high hardness of 57 HRC and 51 HRC, respectively, at room temperature which remained superior to that of Inconel 713C up to 800 °C. |