Tensile properties and deformation mechanisms of nimonic 105 superalloy at different temperatures

Tensile properties and deformation mechanisms of Nimonic 105 superalloy were investigated at temperatures from room temperature (RT) to 1000 degrees C. The results showed that serrations were present in the stress-strain curves of the alloy at temperatures of 300-600 degrees C, and the nature of serrations changed from type A to type (A + B) and then to type C with increasing temperature. The ultimate tensile strength of the alloy decreased gradually from RT to 700 degrees C and then decreased remarkably with increasing further temperature. The yield strength of the alloy did not significantly change from RT to 750 degrees C, while it droped rapidly above 800 degrees C. Transmission electron microscopy (TEM) observations revealed that the main deformation mechanism of alloy below 750 degrees C was strongly-coupled dislocation pairs shearing, whereas Orowan looping and climb and cross-slip of dislocations acted as the principal deformation mechanisms above 800 degrees C. Moreover, a few deformation twins and extended stacking faults were observed in the matrix at temperatures of 750-800 degrees C. On the basis of experimental results, the relationship between tensile properties of the alloy and deformation mechanism was discussed.

Automated summary

The tensile properties and deformation mechanisms of Nimonic 105 superalloy were studied at temperatures ranging from room temperature to 1000 degrees C. The alloy exhibited serrations in the stress-strain curves at temperatures between 300-600 degrees C, with the nature of serrations changing with temperature. The ultimate tensile strength decreased gradually up to 700 degrees C and dropped significantly at higher temperatures, while the yield strength remained stable up to 750 degrees C. Different deformation mechanisms were observed at different temperatures.