Controlling distortion in processed beryllium copper alloys

Details Controlling distortion in processed beryllium copper alloys Controlling distortion in processed beryllium copper alloys

1988-03-04

1989-05-23

Roy, Upendra

Metal treatment

Compositions

Heat treating

148 127C, 148 20, C22F 104

Patent

active

048327565

ABSTRACT:
This invention provides a novel method for the production of reproducible parts formed from beryllium copper alloys. More specifically, the invention provides a process for the production of mill hardened beryllium copper strip, wire, rod or tubing with improved mechanical properties from which formed parts can be age hardened in a reproducible manner to give minimal distortion and improved mechanical properties over a broad range of temperatures. To this end the process comprises a deries of mechanical and thermal treatments which minimize or eliminate non-reproducible distortion by decreasing the magnitude of the residual stresses throughout the various steps of the process before the formation of precipitates becomes the dominant mechanism and by providing a more even patterned distribution of precipitates in the matrix of the alloy both prior to and after a thermal aging process. The implementation of this process, in conjunction with a precipitation hardening treatment utilizing a molten heating medium, results in an alloy which exhibits an increased elongation in tandem with an increased yield stress.

REFERENCES:
patent: 3658601 (1972-04-01), Britton et al.
patent: 4541875 (1985-09-01), Woodard et al.
patent: 4565586 (1986-01-01), Church et al.
patent: 4579603 (1986-04-01), Woodard et al.
patent: 4594116 (1986-06-01), Inagaki
patent: 4724013 (1988-02-01), Church et al.

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