Influence of solid cohesion on viscous properties in Norton law for aluminum alloys during partial solidification

Nagata, Yoshihiro and Takai, Ryosuke and Okane, Toshimitsu and Ahmad Hairuddin, Muhammad Khairi Faiz and Yoshida, Makoto (2022) Influence of solid cohesion on viscous properties in Norton law for aluminum alloys during partial solidification. Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, 832. ISSN 0921-5093, DOI

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This study investigated the influence of the solid cohesion, f(sc), on the viscous properties (m-value and k-value in the Norton law) for aluminum alloys during partial solidification. In the previous study of Haaften (Mater. Sci. Eng. A, 336 (2002), 1-6), a constitutive model taking into account f(sc) was proposed as (epsilon)over dot = k(T) (sigma/f(sc)(theta,T))(n(=1/m)), where theta referred to the dihedral angle at the solid/liquid interface. However, even though it is well known that the m-value decreases with the decreasing temperature in the semi-solid state, the model defined the m-value as a constant to the temperature. Therefore, m = f(f(sc)) and k = g(f(sc)) during solidification were clarified in this study. The viscous properties were obtained by tensile tests during partial solidification for Al-5mass%Mg and Al-2mass %Cu alloys. As a result, it was found that the change in the m-value of 0 <= f(sc) < f(sc vertical bar was expressed by the following linear rule-of-mixtures: m = m(solid)(f(sc)/f(sc vertical bar + m(liquid)(1-f(sc)/f(sc vertical bar, where f(sc vertical bar is f(sc) at the beginning of the eutectic solidification, while m(solid) and m(liquid) are the m-values just below the solidus temperature and at f(sc) = 0, respectively. The increase in f(sc) due to the eutectic solidification hardly affected the change in the m-value and such a value was equivalent to m(solid). On the contrary, the change in the k-values was found to obey the Arrhenius equation rather than be controlled by f(sc). It is suggested that regardless of the aluminum alloy composition, the viscous properties of partial solidification can be determined using the these relationships.

Item Type: Article
Uncontrolled Keywords: Semi-solid;Aluminum alloy;Direct chill casting; Solidification cracking;Constitutive behavior;Mechanical properties
Subjects: Q Science > Q Science (General)
T Technology > T Technology (General)
T Technology > TN Mining engineering. Metallurgy
Divisions: Faculty of Engineering
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 25 Jul 2022 06:53
Last Modified: 25 Jul 2022 06:53

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