Viscosity Estimation of Semi-solid Alloys by Drop Weight Backward Extrusion Test under High Speed Deformation

被引：1

作者：

Ghadiani, S. ^{[1
]}

Aashuri, H. ^{[1
]}

Khosravani, A. ^{[1
]}

Foroughi, A. ^{[1
]}

机构：

[1] Sharif Univ Technol, Dept Mat Sci & Engn, Tehran 113658639, Iran

来源：

Semi-Solid Processing of Alloys and Composites X | 2008年 / 141-143卷

关键词：

Apparent viscosity; back ward extrusion; drop weight; A356; EMS;

D O I：

10.4028/www.scientific.net/SSP.141-143.379

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

A simple method for estimating the apparent viscosity of semi-solid alloys was investigated. A drop weight of 50Kg and backward extrusion equipments were used to test the deformation. Backward extrusion was employed in a closed die system due to the very little separation of liquid from solid phases compared with other methods at very high deformation rate. The half of the calculated impact velocity, 700mm/s was considered as an average velocity for deformation during the test, since the slop of the velocity changes against time is constant in the middle stage of the deformation. The initial height of the sample and the thickness of the residual compressed solid at the bottom of the cup were used to calculate the amount of apparent viscosity of A356 aluminum alloy in this work.

引用

页码：379 / 383

页数：5

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