Processes for producing fine grained metal compositions using co

Details Processes for producing fine grained metal compositions using co Processes for producing fine grained metal compositions using co

1998-06-10

2000-09-19

Jenkins, Daniel J.

Metal treatment

Process of modifying or maintaining internal physical...

Heating or cooling of solid metal

266103, 266249, C22F 104, C22F 300

Patent

active

061206253

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 produce 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.

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