高性能织构Cu基合金复合基带立方织构形成的研究

Development of the Cube Texture in High-Performance Textured Cu Based Composite Substrate

摘要:

采用放电等离子体烧结的方法制备了外层为Cu60Ni40合金，芯层为Ni9W合金的Cu基复合坯锭，结合传统的RABiTS路线成功获得了无铁磁性、高强度、强立方织构的Cu60Ni40-Ni9W-Cu60Ni40复合基带。利用EBSD技术对复合基带轧制织构及再结晶退火后的微取向特征进行了分析表征。测试结果表明：大变形量冷轧后复合基带表面形成了典型的铜型轧制织构，在截面方向上织构呈现梯度分布的特征，在再结晶退火后该复合基带表面立方织构含量达到了97.6%（<10o），并发现，在再结晶过程中立方织构优先在外层材料中形核、长大，并逐渐吞并周围的非立方晶粒。对其力学性能表征发现：该复合基带在室温下的屈服强度为170 MPa，达到了商业化Ni5W合金基带的水平。

Abstract:

The composite alloy ingot with Cu60Ni40 alloy as the outer layer and Ni9W alloy as the inner layer was obtained using the Spark Plasma Sintering (SPS) method. Then the Cu60Ni40-Ni9W-Cu60Ni40 composite substrate with non-magnetic, high strength and strong cube texture were prepared by RABiTS technology. The rolling texture and the micro-orientation of composite substrates processed by heavy cold rolling and recrystallization annealing was analyzed by EBSD technique. The results show that a typical copper-type rolling texture is obtained in the surface of the Cu60Ni40-Ni9W-Cu60Ni40 composite substrate after heavy cold rolling; meanwhile the texture gradient is rendered in the section direction in the sample. The cube texture (<10°) in the surface of the composite substrate reaches 97.6%. In the recrystallization process, the cube grains have the tendency to nucleate and grow up in the outer layer rather than in the inner layer, and the cube grains in the outer layer gradually merge the non-cubic grains in the inner layer. Moreover, through the analyses of mechanical properties, the yield strength σ0.2 of the tapes approaches to 170 MPa, which is similar to the level of the commercial Ni5W tapes.