高性能NiAl共晶合金JJ-3

CHARACTERISTICS OF A NiAl EUTECTIC ALLOY JJ-3 WITH EXCELLENT PROPERTIES

JJ-3合金是具有中国自主知识产权的高性能NiAl共晶合金.本文介绍了JJ-3合金的成分与组织特点,评述了JJ-3合金的物理、力学、化学性能及工艺特性.在保持NiAl合金特有的密度低、熔点和导热率高、抗高温氧化性能优异的基础上,JJ-3合金高温持久性能已达到定向凝固高温合金水平.JJ-3合金具有良好的可焊性和铸造性能,已浇铸出形状复杂的叶片.JJ-3合金优异的综合性能为NiAl合金的工程化应用提供了基础,但其室温塑性低的缺点尚待进一步突破.

A new NiAl eutectic alloy JJ—3 with excellent comprehensive properties had been successfully developed in China for the potential vanes materials. In this paper, the study results on alloy JJ—3, including the composition, microstructure characteristics, physical, mechanical and chemical properties, and process technologies have been introduced briefly. On the basis of maintaining the low density, the higher melting point and thermal conductivity, the excellent oxidation resistance being peculiar to NiAl alloy, alloy JJ—3 have good high temperature stress—rupture strength, which are almost as the same as those of the advanced directionally solidified superalloys. Meanwhile, alloy JJ—3 possess good weldability and castability, and had already been cast the vanes with the complicated shape. With the excellent comprehensive properties, alloy JJ—3 is very close to practical engineering application, only if the poor ductility at room temperature must be improved in the future.