采用冷静液挤压的方法将银管套装铝棒坯料挤压成银包铝线材,再通过多道次拉拔制备外径小于d 100 μm的银包铝丝材.结果表明:银管和铝棒的硬度比和模角大小对静液挤压银包铝复合线材的稳定制备具有显著的影响,当管和铝芯棒的硬度比为50-20、模角为45`时,可以成功制备质量良好的银包铝复合线坯.合理的拉拔和退火工艺为:分别在丝径拉拔至d 1.7、0.28和0.09 mm时各退火一次,d 1.7 mm线材退火温度为200 ℃,保温时间5 min;其余情况下,退火温度为150 ℃,保温时间5 min.制备的名义外径为d 70 μm丝材的丝径和包覆层厚度测试结果表明:丝径为(70±2) μm,包覆层厚度为9～12 μm.外径为90、70和40 μm的丝材在150 ℃、5 min退火后的拉伸强度分别为151、177和183 Mpa,伸长率分别为9.69%、4.41%和2.34%.
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