| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide rhenium-free nickel-based alloys, more particularly, the alloys comprise preferred levels and ratios of elements so as to achieve good high temperature strength of both γ matrix phase and γ' precipitates, as well as good environmental resistance, without using rhenium. <P>SOLUTION: When cast and directionally solidified into single crystal form, the alloys exhibit creep and oxidation resistance substantially equivalent to or better than rhenium-bearing single-crystal alloys. Further, the alloys can be processed by directional solidification into articles in single crystal form or columnar structure comprising fine dendrite arm spacing, e.g., less than 400 μm, if need be, so that further improvements in mechanical properties in the articles can be seen. <P>COPYRIGHT: (C)2011,JPO&INPIT |
