Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal
Reexamination Certificate
2006-05-02
2006-05-02
Wyszomierski, George (Department: 1742)
Metal treatment
Process of modifying or maintaining internal physical...
Heating or cooling of solid metal
C148S693000, C148S694000
Reexamination Certificate
active
07037391
ABSTRACT:
The process is for ageing heat treatment of an age-hardenable aluminium alloy which has alloying elements in solid solution. The process includes holding the alloy at an elevated ageing temperature which is appropriate for ageing the alloy to promote precipitation of at least one solute element, herein termed “primary precipitation” for a period of time which is short relative to a T6 temper. Resultant underaged alloy then is cooled from the ageing temperature to a lower temperature and at a sufficiently rapid rate to substantially arrest the primary precipitation. The cooled alloy then is exposed to an ageing temperature, lower than the elevated ageing temperature for primary precipitation, so as to develop adequate mechanical properties as a function of time, by further solute element precipitation, herein termed “secondary precipitation”.
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Lumley Roger Neil
Morton Allan James
Polmear Ian James
Commonwealth Scientific and Industrial Research Organization
Ladas & Parry LLP
Morillo Janelle
Wyszomierski George
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