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Coefficient of Linear Thermal Expansion of Titanium

The table below lists representative linear thermal expansion coefficients (CTE) specifically for titanium and titanium alloys. Values are given as ×10⁻⁶/°C and ×10⁻⁶/°F over typical temperature intervals.

For a general comparison of thermal expansion coefficients across metals, see the main reference: Thermal Expansion Coefficient of Metals .

CTE Unit Converter

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Microstrain per °C (μm/m·°C)
Microstrain per °F (μin/in·°F)
Per Kelvin (decimal)

Conversion: (×10⁻⁶/°F) = (×10⁻⁶/°C) ÷ 1.8   •   (1/K) = (×10⁻⁶/°C) × 1e-6.

Linear Thermal Expansion Coefficient of Titanium & Alloys
Material Temperature Range CTE (×10⁻⁶/°C) CTE (×10⁻⁶/°F)
Titanium (99.9% Ti) 20 °C / 68 °F 8.41 4.67
Titanium Grade 2 0–100 °C / 32–212 °F 8.6 4.78
Ti-6Al-4V (Grade 5), Annealed 0–100 °C / 32–212 °F 8.6 4.78
Ti-5Al-2.5Sn 0–100 °C / 32–212 °F 9.4 5.22
Ti-8Mn 20–100 °C / 68–212 °F 8.6 4.78

Notes:

  • Values shown are representative; actual CTE can vary with alloy composition, microstructure, and temperature.
  • Ranges like 0–100 °C indicate average CTE over that interval; instantaneous CTE may differ slightly at specific temperatures.
  • Convert between units using the converter above: α(×10⁻⁶/°F) = α(×10⁻⁶/°C) ÷ 1.8.

Why titanium has a low thermal expansion coefficient

Titanium exhibits a relatively low thermal expansion compared with aluminum and copper because of its hexagonal close-packed (HCP) crystal structure and strong atomic bonding. Typical titanium alloys have CTE values around 8–10 × 10⁻⁶/°C, roughly half that of aluminum alloys.

This low expansion, combined with high strength-to-weight ratio, is one reason titanium alloys such as Ti-6Al-4V are widely used in aerospace structures, gas turbines, and precision assemblies where thermal mismatch must be minimized.

Reference