Method of treating metal alloys to work them in the state of a liquid phase-solid phase mixture which retains its solid form
US4106956A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 18, 1977 |
| Grant date | Aug 15, 1978 |
| Priority date | — |
| Expiry date | Feb 18, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22F1/057
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process is disclosed for facilitating extrusion or rolling of a solidified dendritic aluminum base alloy billit, or the like, by heating the billet to provide an inner liquid phase of below 25%, by weight, wherein the dendritic phase has started to develop into a primary solid globular phase without disturbing the solidified character of the billet, followed by working of the treated billet. The process enables a reduction in working pressure and results in improved mechanical properties of the product. Optionally, in the case of precipitation hardening aluminum base alloys, quenching of the workpiece is effected as it exits from the die or mill, followed by artificial or natural aging. In another embodiment, the composition of the alloy of the billet being treated contains an amount of hardening constituent whereby the composition of the globular solid phase of the product approximates the composition of the alloy per se.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.