High Temperature Stability of Microstructure of NiAl-Cr(Mo) and NiAl-Cr(Mo)-4Fe Eutectic Alloys

Author of the article:LYU Yongfei, KANG Shengfeng, WANG Lei

Author's Workplace：School of Materials Science and Engineering, Xi'an University of Technology, Xi'an 710048, China

Key Words：eutectic alloy; high temperature stability; heat treatment

Abstract：NiAl-Cr(Mo) and NiAl-Cr(Mo)-4Fe eutectic alloys were heat treated at 1 100 ℃ and 1 200 ℃, respectively, and their high temperature stability was studied by OM, SEM and SEM-EDS. The results show that the Cr (Mo) layer in the center of eutectic dendrite is clipped and the corresponding gap is formed after heat treatment above 1 100 ℃. With the increase of temperature and time, the number and length of interstitial space gradually increase, and the high-temperature stability of the microstructure becomes worse. The addition of Fe also reduces its high temperature stability to a certain extent