標題: Extrusion of three-layer composite hexagonal clad rods
作者: Wu, CW
Hsu, RQ
機械工程學系
Department of Mechanical Engineering
關鍵字: composite clad rods;niobium-tin alloy;copper-tin alloy
公開日期: 10-Apr-2002
摘要: Composite clad rods consisting of three different materials are applied extensively as conductors, electrodes and chemical devices. Commercial applications involving low temperature niobium-tin alloy (Nb3Sn) superconductor rods, which have a pure niobium (Nb) core, a copper-tin (Cu-Sn) alloy outer sleeve and a Nb3Sn diffusion layer in between, stipulate these conductors as, electrodes that are intended for processing as rods of various shapes. During the extrusion process, non-homogeneous deformation tends to occur because the billet consists of materials with different mechanical properties. In this study, the authors present a numerical simulation model based on the upper-bound theorem to analyze three-layer composite clad rods with a hexagonal cross-section under extrusion. A velocity field is also generated with the assistance of a product's cross-section profile functions. The velocity component in the extrusion axis is expressed as a convex distribution. Analytical results indicate that various process variables such as the semi-die angle, reduction of area, friction condition of the die and combinations of the three constituent materials, prominently influence the extrusion process. Moreover, the extrusion pressure, product dimension-change and the probability of sound extrusion are related closely to the process variables. (C) 2002 Elsevier Science B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/S0924-0136(02)00036-5
http://hdl.handle.net/11536/28862
ISSN: 0924-0136
DOI: 10.1016/S0924-0136(02)00036-5
期刊: JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
Volume: 123
Issue: 1
起始頁: 47
結束頁: 53
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