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TEM characterisation of fatigue tested lamellar Ti-44Al-8Nb-1B

  • H Jiang (a1), D Hu (a2) and I P Jones (a1)


Detailed microstructural examination by TEM of fine-grained polycrystalline lamellar Ti-44Al-8Nb-1B after fatigue testing (R=0.1) at room temperature has been carried out. The operative slip systems were identified as 1/2<110> ordinary dislocations and 1/6<112> twinning. The results showed no strong relation between operative slip systems and macroscopic Schmid factor and it is believed the local stress conditions control the operation of the slip systems. Translamellar cracking was observed to be associated with fine transverse twins in the gamma lamellae.



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