Study on Dynamic Tensile Mechanical Behavior and Deformation Mechanisms of CrCoNi Medium Entropy Alloy at Room and Cryogenic Temperature
Bibliographic record
Abstract
摘要： CrCoNi中熵合金在准静态拉伸下具有良好的强度和塑性，而其动态拉伸力学行为还有待研究。利用霍普金森拉杆分别对CrCoNi中熵合金试样进行了室温(298 K)和低温(77 K)下不同应变率的动态拉伸力学行为研究，建立了修正的J-C(Johson-Cook)本构模型对其塑性流动行为进行了较好的描述，通过断后样品的微观组织表征揭示了其变形机理。结果表明：室温下CrCoNi中熵合金的强度和塑性随着应变率增大逐渐提高。与准静态拉伸相比，动态拉伸应变率为1 200～5 000 s-1时，试样的屈服强度增大至560 MPa到1 150 MPa，伸长率增长至60%到90%；低温下强度表现出相似的应变率效应且强度较室温下更高，但韧性有所降低。变形机理结果表明：相比于室温准静态，室温动态拉伸下试样内部孪晶密度更大且交叉孪晶出现、FCC→HCP相变发生、纳米晶形成，三者共同作用促使CrCoNi中熵合金加工硬化提高；相比于室温动态拉伸，低温动态拉伸下试样孪晶密度过大导致孪晶增厚，且纳米晶形成，促使试样加工硬化进一步提高，而孪晶增厚加强了对位错的阻碍致使韧性降低。
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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 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 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".