Title:
PROCESSES FOR PRODUCING FINE GRAINED METAL COMPOSITIONS USING CONTINUOUS EXTRUSION FOR SEMI-SOLID FORMING OF SHAPED ARTICLES
Document Type and Number:
WIPO Patent Application WO2000047787
Kind Code:
A3
Abstract:
There are provided a continuous frictional extrusion process for continuously producing a deformed fine grain solid metal composition suitable for semi-solid forming. The process is featured by a large range of product dimension and by precise control of the process parameter, such as total deformation, extrusion temperature and speed. The total deformation is controlled to be larger than a Mises effective strain of 2.3 to obtain a deformed fine grain structure with enough distortion energy stored, having a grain size less than 30 mu m and a subgrain size less than 2 mu m. A method combining the continuous extrusion process of preparing semi-solid raw material with semi-solid forming of shaped articles is also disclosed.
Inventors:
SALUJA NAVTEJ S
ZHOU YOUDONG
LU JIAN
ZHOU YOUDONG
LU JIAN
Application Number:
PCT/IB1999/002128
Publication Date:
January 04, 2001
Filing Date:
June 10, 1999
Export Citation:
Assignee:
SURALTECH INC (CA)
International Classes:
B21C23/00; C22C1/00; (IPC1-7): C22C1/00
Domestic Patent References:
| WO1998033610A1 | 1998-08-06 |
Foreign References:
| US4415374A | 1983-11-15 |
Other References:
ERZ, HANS-PETER: "Thixocasting-ein Giessverfahren zur Near-net-shape-Produktion", GIESSEREI, vol. 77, no. 19, 17 September 1990 (1990-09-17), DÜSSELDORF, pages 613 - 617, XP002151544
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