Deformation behavior and microstructure of NiAl-Cr(Mo) alloy by powder metallurgical technique
(1.School of Mechanics and Automobile, Shenyang Institute of Aeronautical Engineering, Shenyang 110034, China2.中国科学院 金属研究所, 沈阳 1100163.Department of Materials Engineering, Dalian University of Technology, Dalian 116024, China)
Abstract: NiAl-28Cr-6Mo alloy was prepared by hot-pressing (HP) the atomized prealloyed powders. The results show that the powders have uniformly refined size and small interlamellar spacing; the porosity is the main defect in the powder metallurgy (PM) alloy, the Cr(Mo) phase in the alloy is easy to segregate to form network in the interior of the original powders and blocks at the boundaries of the original powders during the HP processing; the PM alloy exhibits a high-level combination of fracture toughness and tensile strength, whereas the creep resistance of the PM alloy is degraded.
Key words: hot pressing； NiAl-28Cr-6Mo； microstructural refinement； mechanical properties