Change in the vibrational properties of bulk metal glass with time
Bibliographic record
Abstract
The velocity of ultrasonic longitudinal and transverse waves in ${\mathrm{Zr}}_{46.75}{\mathrm{Ti}}_{8.25}{\mathrm{Cu}}_{7.5}{\mathrm{Ni}}_{10}{\mathrm{Be}}_{27.5}$ bulk metal glass has been measured at $298\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ after its annealing for different times at $523\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, a temperature $97\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ below its apparent ${T}_{g}$. Elastic constants and vibrational contribution to thermodynamic properties have also been determined. At $298\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, the normalized value of the instantaneous bulk and shear moduli, $K$ and $G$, increases with the annealing time, $t$, according to the relation $[1\ensuremath{-}\mathrm{exp}\text{\ensuremath{-}}{(kt)}^{n}]$ with $k=7.4\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}\phantom{\rule{0.3em}{0ex}}\mathrm{s}$, $n=0.5$. It is found that $K(t)=a+bG(t)$, where $a$ and $b$ are constants. In terms of a recent model for viscous flow, an extrapolated increase in $G$ with $t$ corresponds to an approximate three-fold increase in viscosity and 5% decrease in the mean-square atomic displacement at $298\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. The increase in $K$ and $G$ corresponds to a 2.4% increase in the Debye frequency, and 0.3% and 2.4% decrease, respectively, in the Debye heat capacity and entropy, and 0.86% increase in the Debye energy. The Poisson's ratio decreases with $t$, i.e., the glass becomes laterally stiffer. The $K(t)=a+bG(t)$ relation is consistent with a relation obtained for Lennard-Jones interactions. In the potential energy landscape paradigm, annealing appears to shift the state point of a glass to a deeper and more-curved minimum.
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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 | 0.000 | 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) | 0.000 | 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".