Research

 

Recent studies1,2,3 show that intermetallic eutectic compositions in Ni-Al-Zr ternary system have attractive properties with respect to strength and ductility. These systems have very high compressive and tensile yield strengths at elevated temperatures along with reasonable tensile ductility at ambient temperature. Coupled with excellent microstructural stability at higher temperatures, they also show good oxidation resistance. The density of these alloys lie in the range of 7.35-7.95 gm/cm3, which is less than recent generation cast commercial nickel based superalloys.

 

My thesis looks at, the mechanical behavior of an intermetallic eutectic alloy, Ni3Al+Ni5Zr as a function of temperature and strain rate. Creep properties of these alloys have to be evaluated at different stress levels at different temperatures. Activation energy calculations along with  dislocation studies will be done via TEM.  The microstructure of this alloy consists of nano-sized ultra fine lamellar structure of Ni3Al and Ni5Zr with multiple length scales. The relationship between yield strength and the micro-structural length scales will also be explored.

 

References

 

[1] Tiwary, C.S., Gunjal V.V., Banerjee D., Chattopadhyay K., “Intermetallic eutectic alloys in the Ni-Al-Zr

 

system with attractive high temperature properties”, Matec Web of Conferences: EURO-

 

SUPERALLOYS 2014. 14,  (2014) Art. No. 01005

 

[2] Tiwary, C.S., “Microstructural, Mechanical and Oxidation behavior of Ni-Al-Zr Ternary Alloys”, PhD

 

Thesis Indian Institute of Science, March 2014

 

[3] Gunjal V.V., “Microstructural, Mechanical and Oxidation behaviour of Ni-Al-Zr Intermetallic Eutectic

 

Alloys”, PhD Thesis Indian Institute of Science, August 2015