采用水平连续定向凝固法制备了φ16 mm的Cu-2.0Ag铜杆,经多道次冷拉拔,获得了直径为0.043 mm的高强高导微细线,其抗拉强度为1062 MPa,导电率为79.12％IACS.在拉拔过程中,柱状晶组织逐步演变为纤维组织,并形成了强化银纤维.当φ16 mm杆拉拔到φ6.2 mm时,晶体取向发生偏转,少量＜100＞织构转变为＜111＞、＜112＞织构,等效滑移系数减少,Schmid因子减小,线材抗拉强度增强.拉拔过程中导电率下降,主要是由于纤维细化以及界面散射效果增强所致.随着形变量的增大,导电率的下降速度先增大后减小,φ16 mm杆拉拔为φO.043 mm微细线时,导电率仅下降了11.39％IACS,仍保持较高的导电性.
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