Metal treatment – Compositions – Heat treating
Patent
1981-08-07
1983-09-27
Skiff, Peter K.
Metal treatment
Compositions
Heat treating
148 127C, 148160, C22F 108
Patent
active
044067127
ABSTRACT:
Alloys comprising copper, nickel and tin, when appropriately processed, exhibit high levels of tensile strength and ductility. Processing has been by cold working and aging or, when cold working is impracticable, by aging of alloys which are modified by the addition of a refractory element.
It has been discovered that, even without cold working and even in the absence of additives, strong and ductile Cu-Ni-Sn alloys can be produced when a body of the alloy is subjected to a characteristic heat treatment to develop an alpha plus essentially nonlamellar gamma structure. This is followed by cooling and aging at a temperature and for a time corresponding to a predominantly spinodal alpha-1 plus alpha-2 structure.
Typical properties are a 0.01 percent offset yield strength of 128 Kpsi and an elongation to fracture of 5 percent in an alloy comprising 15 weight percent Ni, 8 weight percent Sn, and remainder essentially Cu.
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E. M. Wise et al., "Strength and Aging Characteristics of the Nickel Bronzes", Trans. AIME, Institute of Metals Division, vol. 3, pp. 218-243, (1943).
T. E. Kihlgren, "Production and Properties of Age Hardenable Five Percent Nickel-Bronze Castings", Trans. AFA, vol. 46, pp. 41-64, (1938).
L. H. Schwartz et al., "Spinodal Decomposition in a Cu-9 Weight Percent Ni-6 Weight Percent Sn Alloy", Acta Metallurgica, vol. 22, May 1974, pp. 601-609.
J. T. Eash, "Constitution of Copper-Nickel-Tin Alloys", Metals Handbook, American Society for Metals, 1939.
Bell Telephone Laboratories Incorporated
Businger Peter A.
Skiff Peter K.
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