Development Of The Continuous Process Method
For ECAP Using A Tri-axis Rotary Die And
Microstructural Evolution Of Semi-solid
Aluminium Alloy
Author(s)
K. Natori, F. Nomura, Y. Arao & T. Tanaka
Abstract
The continuous ECAP process which can provide three-dimensional strain was
developed in this study. A die with tri-axis crossed channels having channel
angle φ of 90° and curvature ψ of 0° was created. As a result, continuous ECAP
process via route Bc for AC4CH aluminium semi-solid alloy could be performed
at 573K at pressing speed of 0.5mm/sec using the developed die. The continuous
method cut the processing time in half compared to the non-continuously
conventional method. The grains became fine from 100μm to approximately
2μm. Workpiece processed 8 passes exhibited four times higher toughness than
as-cast alloy.
Keywords: equal-channel angular pressing, severe plastic deformation, ultrafine
grained, semi-solid cast, continuous process, Tri-RD-ECAP, Al-Si-Mg alloy.
1 Introduction
The process of grain refinement in metal materials is generally known as the way
to improve their strength and ductility without losing toughness. In recent years,
much attention has been paid to methods which can give the grain refinement by
severe deformation. The methods can improve the microstructure of alloy more
energy efficient compared to rapid solidification, stirring during solidification,
and heat treatment. Equal-Channel Angular Pressing (ECAP) is especially
different from other kinds of the method such as using rolling and drawing, and
is not restricted in bulk shape. This implies there is no limit for the amount of
Keywords
equal-channel angular pressing, severe plastic deformation, ultrafine
grained, semi-solid cast, continuous process, Tri-RD-ECAP, Al-Si-Mg alloy.
Related Book
Other papers in this volume
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