Improvement of strength and conductivity for Cu-Ti alloys aged in a hydrogen atmosphere

我们尝试用氢化法制备具有高强度和高导电性的Cu-Ti基合金。Cu-Ti合金在氢气氛中时效后，其导电性能得到显著提高，而力学性能没有降低。强化主要是由于针状Cu 4 Ti析出相的细小弥散，这与常规真空时效的情况相似。导电性的增强是由于基体相中溶质Ti的浓度降低，这是由Cu 4 Ti和TiH 2的共沉淀引起的。在较高的氢压和较低的温度下进行时效处理，可以改善强度和导电性的平衡。时效前的预变形也有利于提高合金的性能。最后，我们证明，优化热机械工艺条件赋予了一个很好的平衡的强度和导电性，分别超过950 MPa和25%IACS。

We attempted to prepare Cu-Ti based alloys with a high strength and a high electrical conductivity by hydrogenation procedures. The electrical conductivity of Cu-Ti alloys was significantly improved without degradation of the mechanical properties by aging in a hydrogen atmosphere. The strengthening was primarily due to fine dispersion of needle-shaped Cu4Ti precipitates, which was similar with the case of conventional aging in vacuum. The enhancement of the conductivity was due to a reduction of a concentration of solute Ti in the matrix phase, which was caused by co-precipitation of Cu4Ti and TiH2. The balance of the strength and conductivity was improved by aging under a higher hydrogen pressure at a low temperature. Prior-deformation before aging was also useful to improve the properties. Eventually, we demonstrated that optimizing the thermomechanical process conditions imparted an excellent balance of strength and conductivity, of more than 950 MPa and 25% IACS, respectively.