Process for improving the elongation of grain refined copper base alloys containing zinc and aluminum
AssigneeOlin Corporation
InventorsEugene Shapiro, Jacob Crane
Life of this patent
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Abstract
A process for improving the elongation of copper base alloys containing about 2 to 4.5% aluminum, 15 to 31% zinc, and a grain refining element such as iron, chromium, zirconium, or cobalt, is carried out through controlled grain coarsening. Such alloys are subjected to a cold reduction of about 15 to 40%, an intermediate anneal at about 625.degree. to 725.degree.C., a final cold reduction of 12 to 45% and a final anneal at about 600.degree. to 725.degree.C. Alternatively, the above sequence may be preceded by a preliminary cold reduction of about 10 to 70% and then a preliminary low temperature anneal at about 400.degree. to 600.degree.C. followed by the above reductions and anneals.
Claims15
A process for improving the elongation of copper base alloys by controlled grain coarsening comprising:
- providing a copper base alloy containing about 2 to 4.5% aluminum, 15 to 31% zinc, and a grain refining element selected from the group consisting of iron about 0.001 to 3%, chromium about 0.001 to 1%, zirconium about 0.001 to 1.0%, cobalt about 0.001 to 3.0%, and mixtures of these elements, and balance essentially copper, said alloy being in the annealed condition;
- subjecting said alloy to a cold reduction of about 15 to 40%;
- then annealing said alloy at a temperature of about 625.degree. to 725.degree.C.;
- subjecting said alloy to a final cold reduction of 12 to 45%;
- and
- then final annealing said alloy at a temperature of about 600.degree. to about 725.degree.C.
A process for improving the elongation of copper base alloys by controlled grain coarsening comprising:
- A. providing a copper base alloy containing about 2 to 4.5% aluminum, 15 to 31% zinc, and a grain refining element selected from the group consisting of iron about 0.001 to 3%, chromium about 0.001 to 1%, zirconium about 0.001 to 1%, cobalt about 0.001 to 3% and mixtures of these elements, and balance essentially copper, said alloy being in the annealed condition;
- B. cold reducing said alloy 20 to 35%;
- C. then intermediate annealing said alloy at a temperature of about 650.degree. to 700.degree.C.:
- D. then finally cold reducing said alloy about 15 to 35%;
- and
- E. then finally annealing said alloy at a temperature of about 675.degree. to 725.degree.C.
A process for improving the elongation of copper base alloys by controlled grain coarsening comprising:
- A. providing a copper base alloy containing about 2 to 4.5% aluminum, 15 to 31% zinc, and a grain refining element selected from the group consisting of iron about 0.001 to 3%, chromium about 0.001 to 1%, zirconium about 0.001 to 1%, cobalt about 0.001 to 3%, and mixtures of these elements, and balance essentially copper, said alloy being in the annealed condition;
- B. cold reducing said alloy 10 to 70% so that it will recrystallize at a temperature of less than about 600.degree.C.;
- C. then intermediate annealing said alloy at a temperature of about 400.degree. to 600.degree.C.;
- D. then cold reducing said alloy from about 15 to 40%;
- E. then intermediate annealing said alloy at a temperature of about 625.degree. to 725.degree.C;
- F. then finally cold reducing the alloy about 12 to 45%;
- and
- G. then finally annealing said alloy from Step F at a temperature of about 600.degree. to 725.degree.C.
Dependencies are inferred from the claim text.