Wrought brass alloy having a low spring back coefficient and sha

Details Wrought brass alloy having a low spring back coefficient and sha Wrought brass alloy having a low spring back coefficient and sha

1974-09-20

1977-03-29

Stallard, W.

Metal treatment

Compositions

Heat treating

C22F 108

Patent

active

040147169

ABSTRACT:
An improved ternary brass alloy includes silicon as the additive material. The composition limits of the constituents of the brass are fixed by two factors: (1) the M.sub.s or Martensite transformation temperature, and (2) the brass must be a totally beta phase above 454.degree. C. The composition may be betatized, that is, heated at approximately 800.degree. C. and quenched at a fast rate so that the beta phase is retained in order to provide material having a shape memory effect, a low spring back coefficient and super elastic properties. A continuous betatizing and quenching process may be utilized in the manufacture of strip and sheet products. Alternatively, the composition may be hot worked between 600.degree. and 700.degree. C. and then cold worked to provide a material having a low spring back coefficient.

REFERENCES:
patent: 3783037 (1974-01-01), Brook et al.
Busch et al., Alloys of Improved Elastic Properties, Report No. AMRA CR-65-02/1, pp. 1, 13, 14, 43-49, Feb. 1966.
Nagasawa et al., Memory Effect in Cu-Al Alloy, Journal Physical Society of Japan, 30(1971)296.

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