Effects of Zr and Co on the microstructure and mechanical properties of NiAl-based alloys

The purpose of this work is to optimize the composition of NiAl-based alloys via simulation, and to study the effects of Zr and Co on the microstructure and mechanical properties of NiAl-Cr(Mo) alloy. The results show that the 0.5 at% Zr improves the room-temperature compressive strength of the alloy by forming the Heusler phase. Meanwhile, the 1 at%Co reduces the size of the NiAl phase and Cr(Mo) phases and promotes the formation of Heusler phase, which is beneficial to the compressive strength and plasticity. Compared with NiAl-Cr(Mo) alloy, the NiAl-Cr(Mo)-0.5Zr-1Co (at%) alloy shows optimal comprehensive mechanical properties, and the compressive strength and plastic strain of the NiAl-Cr(Mo)-0.5Zr-1Co (at%) alloy is increased by 430 MPa and 69% respectively.