Thermal expansion of TiAl + TiB2 alloys and model calculations of stresses and expansion of continuous fiber composites
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Thermal expansion values for three TiAl alloys with different additions of TiB2 can be represented using a third-order equation at temperatures between 20 and 800°C. Expansion values were obtained on both heating and cooling temperature cycles. The total expansion at 800°C is between 0.917 and 0.931% for three different samples. The expansivity increases from about 10×10−6°C−1 at 80°C to 14×10−6°C−1 at 750°C. A five-coaxial cylinder elastic model for multizone-coated continuous fiber composites is developed for predicting stresses and thermal expansion of composites. Either isotropic or transversely isotropic material properties can be assigned to the various cylinder zones.
Key wordscontinuous fiber composites stress/strain calculations thermal expansion TiAl+TiB2 alloys
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