Development of creep-resistant magnesium casting alloys for high temperature automotive applications
Bibliographic record
Abstract
The low specific gravity of magnesium has made Mg-alloys attractive for automotive and aerospace applications. Conventional Mg casting alloys have been based on the Mg-Al system with additions of Zn, Mn or Si, e.g. AZ91 alloy (Mg-9.0Al-1.0Zn, wt.%). Such alloys, which have good castability, mechanical properties and corrosion resistance, are widely used in the automotive industry. However, due to the rapid degradation of the mechanical properties at elevated temperatures, especially the creep resistance, application of these alloys has been limited to specific components that operate at temperatures below 150 o C. New creep-resistant Mg casting alloys are required for application as transmission cases (temperatures up to ~175 o C), engine blocks (~250 o C) and pistons (~300 o C). The development of such high performance creep-resistant alloys requires the development of microstructures in the cast alloy that both prevent grain boundary sliding and restrict the motion of lattice dislocations within the primary -Mg grains. The development of Mg-Al-Ca casting alloys is described where Ca-containing eutectic phases are precipitated along the grain boundaries and where dislocation motion within the grains is restricted due to solid solution hardening and the presence of dispersed nanoscale eutectic phases
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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 | 0.001 | 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) | 0.001 | 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".