Communication

Metallurgical and Materials Transactions A

, Volume 42, Issue 6, pp 1431-1434

Effect of Strain Rate on Ductile-to-Brittle Transition Temperature of a Free-Standing Pt-Aluminide Bond Coat

  • Md. Zafir AlamAffiliated withDefence Metallurgical Research Laboratory Email author 
  • , D. ChatterjeeAffiliated withDefence Metallurgical Research Laboratory
  • , K. MuraleedharanAffiliated withDefence Metallurgical Research Laboratory
  • , T. K. NandyAffiliated withDefence Metallurgical Research Laboratory
  • , S. V. KamatAffiliated withDefence Metallurgical Research Laboratory
  • , V. JayaramAffiliated withIndian Institute of Science
  • , D. K. DasAffiliated withDefence Metallurgical Research Laboratory

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Abstract

The ductile-to-brittle transition temperature (DBTT) of a free-standing Pt-aluminide (PtAl) bondcoat was determined using the microtensile testing method and the effect of strain rate variation, in the range 10−5 to 10−1 s−1, on the DBTT studied. The DBTT increased appreciably with the increase in strain rate. The activation energy determined for brittle-to-ductile transition, suggested that such transition is most likely associated with vacancy diffusion. Climb of 〈100〉 dislocations observed in analysis of dislocation structure using a transmission electron microscope (TEM) supported the preceding mechanism.