Effects of Nb on the High Temperature Mechanical Properties of TiNiAl Alloys
A series of NiTiAl based alloys with different amount of Nb addition were prepared and the effects of Nb on both the mechanical properties and microstructure evolution were investigated. The addition of Nb can remarkably enhance the high temperature yield strength of these alloys. The highest yield strength of the alloys with 10 at% Nb reaches 1237MPa at 873K and 875MPa at 973K, respectively. The Ti2Ni(Al,Nb) precipitates and the solution strengthening effect might be responsible for the high yield stress achieved at high temperature.
Yafang Han et al.
G. S. Qiu et al., "Effects of Nb on the High Temperature Mechanical Properties of TiNiAl Alloys", Materials Science Forum, Vols. 546-549, pp. 1477-1480, 2007