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 Alloy

# Af Temperature (Austenite Finish)

## Definition

The temperature at which a NiTi alloy completes its transformation to the austenitic phase on warming. Files with an Af above body temperature remain partly martensitic in the canal — generally more flexible, more resistant to cyclic fatigue, and in some alloys pre-bendable — while files with an Af below body temperature behave superelastically. Reported values depend on the manufacturer and measurement method, so Af is a design signal rather than a standalone predictor of clinical performance.

## Related File Systems

[ProTaper Gold](https://endo-guide.app/system/protaper-gold)[WaveOne Gold](https://endo-guide.app/system/waveone-gold)[HyFlex CM](https://endo-guide.app/system/hyflex-cm)[Vortex Blue](https://endo-guide.app/system/vortex-blue)

## Related Terms

[NiTi (Nickel-Titanium)](https://endo-guide.app/glossary/niti)[M-Wire](https://endo-guide.app/glossary/m-wire)[Gold Heat Treatment](https://endo-guide.app/glossary/gold-heat-treatment)[Blue Heat Treatment](https://endo-guide.app/glossary/blue-heat-treatment)[CM-Wire (Controlled Memory)](https://endo-guide.app/glossary/cm-wire)[R-Phase](https://endo-guide.app/glossary/r-phase)

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