Study on Dynamic Tensile Mechanical Behavior and Deformation Mechanisms of CrCoNi Medium Entropy Alloy at Room and Cryogenic Temperature
Why this work is in the frame
A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.
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。
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 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 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 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 it