A Study on Plastic Working of Alloys in their Mashy State
It is well known that flow stress of metal decreases as its temperature rises. This property is applied to various hot plastic workings. Some working processes are now being developed which include metal deformation in the temperature range over solidus line, such as extrusion casting, ACURAD process and continuous casting at high speed. In order to study these processes, it is very important to get the basic data (little of which is known) on flow stress and flow behaviour of metal in the temperature range over its solidus line.
the relationship between flow stress and the solid fraction was clarified
according to the decrease of solid fraction from 100 per cent to 75 per cent, the flow stress decreases to
the alloys in their mashy state fracture in the strain range of 3–10 per cent in uni-axial deformation
bars were successfully extruded in the reduction of 75−99·94 per cent
pipes were successfully extruded in the reduction of 74·7−93·4 per cent
by selecting an optimum temperature, sound products can be obtained at small extrusion force and at high speed.
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