Compressive behavior of NiAl/(Cr,Mo)Hf alloy prepared by high-pressure die casting and hot isostatic pressing
(1.Department of Materials Engineering, Shenyang Institute of Aeronautical Engineering, shenyang 110034, China
2.Department of superalloys, Institute of Metal Research, Chinese Academy of Sciences, shenyang 110016, China
3.辽宁省沈阳市沈阳航空工业学院材料工程系)
2.Department of superalloys, Institute of Metal Research, Chinese Academy of Sciences, shenyang 110016, China
3.辽宁省沈阳市沈阳航空工业学院材料工程系)
Abstract: The NiAl-28Cr-5.85Mo-0.15Hf alloy was prepared by high-pressure die casting (HPDC) and subsequent hot isostatic pressing(HIP), and tested for compressible strength and fracture behavior at 300？1 373 K. The results show that the elevated temperature 0.2% compressible yield strength as well as the room-temperature compressible fracture strain of as-HIP alloy are larger than those of the same alloy prepared by directional solidification (DS). It suggests that the fine structures with a homogeneous distribution of fine Cr（Mo）and Hf-rich phase created by high-pressure die casting lead to these improvements.
Key words: NiAl/Cr(Mo,Hf) alloy; high-pressure die casting; hot isostatic pressing; compressive properties