Substitutional effects of Al and Mn on the microstructure and mechanical response of Cantor-derived high-entropy alloys for nuclear structural applications
Bibliographic record
Abstract
As global energy demands rise, nuclear energy offers a clean and sustainable solution, albeit with safety concerns. Designing next-generation nuclear reactors requires advanced materials with stringent properties, and Cantor-derived high-entropy alloys (HEAs) recently emerged as promising alternatives to conventional nuclear structural-alloys. Among these, Al 0.3 CoCrFeNi is widely studied but is metastable, posing challenges for nuclear applications where stable and low void swelling single-phase FCC-alloys are preferred. Guided by empirical parameters and CALPHAD, we design and develop a novel Cantor-derived FCC-stable Mn 0.3 CoCrFeNi HEA as a potential substitute for Al 0.3 CoCrFeNi. The microstructure and mechanical behaviors of Al 0.3 CoCrFeNi and Mn 0.3 CoCrFeNi under uniaxial quasi-static and dynamic strain-rates were evaluated in three processing conditions—as-cast (AC), homogenized and cold-rolled (CR), and homogenized, cold-rolled and annealed (CRA)—as a first experimental installment towards Mn 0.3 CoCrFeNi candidacy. AC-Mn 0.3 CoCrFeNi exhibits unique “casting twin boundaries” and suppressed cell-structure. While the hardness and yield strength of the AC and CRA samples for both alloys are comparable, those of CR-Mn 0.3 CoCrFeNi surpasses CR-Al 0.3 CoCrFeNi due to higher prior-deformation twins and dislocation density in the former. Unique Type A serration-dynamic strain aging (DSA) is observed in AC and CRA-samples of both HEAs under room temperature/low strain-rate conditions, and it delays instability onset. Meanwhile, DSA suppression in CR samples and those under high strain-rates are attributed to increased dislocation-dislocation and phonon drag-dislocation interactions, respectively. Additionally, Mn 0.3 CoCrFeNi demonstrates a superior strain-hardening rate under all conditions due to Mn 0.3 CoCrFeNi’s lower stacking fault energy and critical twinning stress. These findings establish Mn 0.3 CoCrFeNi as a mechanically-superior candidate for nuclear structural applications.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".