Enhancing Thermal Fatigue Reliability of Pb-Free Solder Alloys with Additions of Bismuth and Antimony
Why this work is in the frame
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Bibliographic record
Abstract
ABSTRACT The thermal fatigue reliability of multiple high reliability solder alloys containing significant additions and combinations of bismuth (Bi) and antimony (Sb) are compared to alloys with additions of Bi or Sb only. The study uses daisy chained test vehicle that includes a 192-pin chip array ball grid array (192CABGA) and an 84-pin thin core BGA (84CTBGA). Thermal cycling is done in accordance with the IPC-9701 attachment reliability guideline using three distinct thermal cycling profiles, 0/100°C, -40/125°C, and -55/125°C. The results indicate that combinations of Bi and Sb generally are more effective than either element as a single alloying addition, although the reliability margins in thermal cycling tests are not always great. The differences in alloy performance with the two BGA packages are compared using Weibull statistics, microstructural characterization, and failure mode analysis.
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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 | 0.000 | 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 | 0.001 | 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