CAJ | 학술논문

通过上引连续铸造—连续挤压法制备了铜镁、铜锡两种合金接触线。结果表明，镁、锡元素的添加均能显著提高接触线的强度，并保证较高的导电率，镁元素的强化效果更为显著。此外，通过连续挤压扩展变形显著改善了铜镁、铜锡合金接触线的铸态组织，获得超细晶粒。主要原因在于上引铸杆在连续挤压过程中处于高压高温的状态，铸态晶粒完全破碎，动态再结晶发生完全。
통과상인련속주조—련속제압법제비료동미、동석량충합금접촉선。결과표명，미、석원소적첨가균능현저제고접촉선적강도，병보증교고적도전솔，미원소적강화효과경위현저。차외，통과련속제압확전변형현저개선료동미、동석합금접촉선적주태조직，획득초세정립。주요원인재우상인주간재련속제압과정중처우고압고온적상태，주태정립완전파쇄，동태재결정발생완전。
Copper-magnesium and copper-tin alloy contact wires were prepared by the cast-continuous extrusion.The results show that adding magnesium and tin elements could significantly increase the strength of the contact wire and ensure high conductivity performance.Magnesium had a more conspicuous strengthening effect.In addition,the cast microstructure of copper-magnesium and copper-tin alloy contact wires significantly improved by expansion deformation.The ultra-fine grain was obtained in that the cast grain was completely broken and then recrystallized dynamically when the up-cast rod remained in a state of high pressure and high temperature during the process of continuous extrusion.