Orientation and temperature effects on indentation creep mechanisms in magnesium
Bibliographic record
Abstract
This study investigates how crystal orientation and temperature affect the indentation creep behavior of pure magnesium at 25 ˚C, 100 ˚C, and 180 ˚C using in-situ indentation and post-test EBSD analyses. The integrated approach enables simultaneous evaluation of orientation-dependent activation parameters ( and ), athermal flow strength , and the contribution of deformation twinning. Results show that creep is primarily governed by obstacle-limited dislocation glide, with twinning contributing at lower temperatures at orientations where slip is limited. At lower temperatures, indentation depth and lattice rotation around the indents are strongly orientation-dependent, while at 180 ˚C these effects are less pronounced, suggesting more homogeneous deformation. The activation energy (0.56–1.09 eV) and volume (10.28 –21.56 ) increase with temperature but are unaffected by orientation, indicating a consistent creep mechanism. The evolution of athermal flow strength reflects a balance between strain hardening and dislocation recovery, with recovery dominating at higher temperatures. Twinning, particularly {10 }< > extension twins, was active at 25 ˚C and 100 ˚C but suppressed at 180 ˚C, and was shown to evolve during the creep hold, confirming its role in accommodating strain under constant load. These findings reveal that creep in Mg results from a temperature-dependent interplay between dislocation glide, evolving internal obstacles, and twinning, offering new insight into the mechanistic basis of time-dependent plasticity in hexagonal metals. The methodology presented in this paper provides a robust framework for investigating time-dependent plasticity in Mg and can be extended to Mg alloys with more complex microstructures.
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How this classification was reachedexpand
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) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 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) | 0.000 | 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, 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".