A study on the fabrication and properties of Ti-Cu clad extrudates

摘要

This study was to investigate the effects of extrusioncondition (extrusion temperature, extrusion ratio, dies angle,initial Ti thickness) on the fabrication of Ti-Cu clad material forhigh conductivity and high corrosion resistance, using indirectextrusion method in which there is no friction between containerand billet. The range of extrusion temperature, extrusion ratio, diesangle and initial Ti thickness were changed from 700degC to900degC, from 9.5 to 38.0, from 20deg to 50deg, and from1.8mm to 4.8mm. respectively. Extrusion pressure decreased withincreasing extrusion temperature owing to the reduction of flowstress. However, increment of extrusion temperature resulted inthe drawback of lubricant effect between dies and billet. Extrusionpressure increased with increasing extrusion ratio and initial Tithickness. Extrusion pressure was also affected by dies angle.Namely, extrusion pressure was raised with smaller dies anglebecause the friction between billet and dies increased with decreasein dies angle. The thickness of interface layer between Ti and Cuincreased with increasing extrusion temperature. The interfacelayer composed of hard intermetallic phases which may act areducer of bonding strength depending upon its thickness.