Metal treatment – Stock – Nickel base
Patent
1986-03-14
1987-12-01
Brody, Christopher W.
Metal treatment
Stock
Nickel base
420460, C22C 1900
Patent
active
047102470
ABSTRACT:
A method for achieving both improved strength and improved ductility in intermediate phases is provided. The method, briefly stated, comprises the steps of providing a melt whose composition substantially corresponds to that of a preselected intermetallic phase having a crystal structure of the Ll.sub.2 type, such as nickel alumininde, modified with from about 0.01 to 2.5 atomic percent boron, and modified further with cobalt substituent metal and rapidly solidifying the melt at a cooling rate of at least about 10.sup.3 .degree. C./second to form a solid body, the principal phase of which is of the Ll.sub.2 type crystal structure in either its ordered or disordered state.
REFERENCES:
patent: 3922168 (1975-11-01), Restall et al.
patent: 4318756 (1982-03-01), Bibring et al.
patent: 4359352 (1982-11-01), Ray et al.
patent: 4478791 (1984-10-01), Huang et al.
C. T. Liu & C. C. Koch, "Development of Ductile Polycrystalline Ni.sub.3 Al for High-Temperature Applications", Technical Aspects of Critical Materials Use by the Steel Industry, NBSIR 83-2679-2, vol. IIB, Jun. 1983, Center for Materials Science, U.S. Dept. of Commerce, National Bureau of Standards.
C. T. Liu, C. L. White, C. C. Koch, & E. H. Lee, "Preparation of Ductile Nickel Aluminides for High Temperature Use", Proc. Electrochemical Soc. on High Temp. Mat., Ed. M. Cubicciotti, vol. 83-7, Electrochemical Society Inc. (1983), p. 32.
Chang Keh-Minn
Huang Shyh-Chin
Taub Alan I.
Brody Christopher W.
Davis Jr. James C.
General Electric Company
Rochford Paul E.
Webb II Paul R.
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