(北京科技大學(xué) 材料科學(xué)與工程學(xué)院，北京 100083)
摘 要: 采用冷靜液擠壓的方法將銀管套裝鋁棒坯料擠壓成銀包鋁線材，再通過多道次拉拔制備外徑小于d 100 μm的銀包鋁絲材。結(jié)果表明：銀管和鋁棒的硬度比和模角大小對靜液擠壓銀包鋁復(fù)合線材的穩(wěn)定制備具有顯著的影響，當(dāng)管和鋁芯棒的硬度比為50׃20、模角為45˚時，可以成功制備質(zhì)量良好的銀包鋁復(fù)合線坯。合理的拉拔和退火工藝為：分別在絲徑拉拔至d 1.7、0.28和0.09 mm時各退火一次，d 1.7 mm線材退火溫度為200 ℃，保溫時間5 min；其余情況下，退火溫度為150 ℃，保溫時間5 min。制備的名義外徑為d 70 μm絲材的絲徑和包覆層厚度測試結(jié)果表明：絲徑為(70±2) μm，包覆層厚度為9~12 μm。外徑為90、70和40 μm的絲材在150 ℃、5 min退火后的拉伸強(qiáng)度分別為151、177和183 MPa，伸長率分別為9.69%、4.41%和2.34%。
關(guān)鍵字: 銀包鋁絲材；靜液擠壓；多道次拉拔；力學(xué)性能
（School of Materials Science and Engineering,University of Science and Technology Beijing, Beijing 100083, China）
Abstract:Silver clad aluminum wires (diameter less than 100 μm) were fabricated through cold hydrostatic extrusion followed by drawing process. The results show that the ratio of hardness of silver tube to aluminum rod and modular angle are the critical factors that contribute to the success of the hydrostatic extrusion process. When the ratio of hardness of silver clad to aluminum rod is 50׃20 and modular angle is 45˚, good silver clad aluminum wires can be fabricated successfully. The appropriate drawing and annealing process is that wire should be annealed while its diameter is 1.7, 0.28 and 0.09 mm respectively and the temperature and the hold time of the first annealing are 200 ℃ and 5 min respectively, and for the rest, are 150 ℃ and 5 min respectively. The measurement results show that the diameter and silver clad thickness of the wire (70 μm in nominal diameter) are (70±2) μm and (9−12) μm, respectively. For the wires of 90, 70 and 40 μm in diameter annealed at 150 ℃ for 5 min, the tensile strengths are 151, 177 and 183 MPa respectively, and the elongations are 9.69%, 4.41% and 2.34%, respectively.
Key words: silver clad aluminum wire; hydrostatic extrusion; drawing with multi-passes; mechanical property
