Characterization of Solvus in Ternary and Quaternary Bismuth Containing Solder Alloys
Why this work is in the frame
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Bibliographic record
Abstract
ABSTRACT Compliance with RoHS 2 requirements has necessitated the development of high reliability alternatives to SAC305 lead free solder. Many of the solders being considered for this role contain bismuth, and as such characterizing the behaviour of this alloying element is vital to understanding the evolution of microstructure in these candidate solders. One of the features that makes Bi so attractive for high reliability solder applications is the balance of solid solution strengthening and precipitation hardening it provides in a beta-tin matrix. Therefore, a particular point of interest is the solvus temperature – the point above which Bi will dissolve into the tin matrix to form a solid solution, and below which Bi will precipitate out of the matrix. To this end, the solvus temperature of a number of Bi containing ternary and quaternary solders was determined using a novel differential scanning calorimetry (DSC) method. This value was validated using classic metallographic techniques applied to samples aged both above and below the experimentally determined solvus temperature, and the observed microstructure was characterized.
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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 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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