Microstructure and compressive properties of NiAl–Cr(Mo)–Dy near eutectic alloy prepared by suction casting

Abstract

The NiAl–Cr(Mo) eutectic alloy doped with Dy was prepared by suction casting technique and its microstructure and mechanical properties were investigated. It is found that with the addition of Dy, the Ni₅Dy phase is formed along the NiAl/Cr(Mo) phase boundary in the intercellular region. By the suction casting method, the microstructure of the alloy get well optimisation which can be characterised by the fine interlamellar spacing, high proportion of eutectic cell area and fine homogeneous distributed Ni₅Dy phase. The compression test results reveal that the room temperature and high temperature mechanical properties of the suction cast alloy improve significantly, compared with the conventionally cast alloy.

Keywords:

• NIAL EUTECTIC ALLOY
• SUCTION CASTING
• MICROSTRUCTURE
• MECHANICAL PROPERTIES