Microstructure and Mechanical Properties of Ti(C,N)-Ni3Al Cermets

摘要

Ni3Al intermetallic powders were prepared by mechanical alloying (MA) technique,and then Ti(C,N)-Ni3Al cermets were prepared by powder metallurgy technique.Microstructure of Ti(C,N)-Ni3Al eermets consisted of Ti(C,N) grains,Mo/W-rich microstrueture and Ni3Al-based binder phase.Press pressure had a slight effect on TRS and hardness of cermets.When Ni3Al content was fixed,hardness increased with the increase of sintering temperature from 1410 ℃ to 1480 ℃,and TRS was not sensitive to sintering temperature within 30wt％ Ni3Al content,but it increased with the increase of sintering temperature at 35wt％ Ni3Al content.When sintering temperature was fixed,TRS increased with the increase of Ni3Al content,while hardness increased with the increase of Ni3Al content up to 30wt％.Brittle fracture mode was the mixture of intergranular and transgranular fracture.