随着轨道式电磁能装备的快速发展，直线推进铜合金部件尺寸将扩展至数十米且质量达到数吨，其制造、加工具有高的挑战性和大的难度，完全依靠熔铸制造路径因合金元素含量受限、工艺调控自由度小等问题已很难制备出合格部件。

我们在前期提出使用固溶态合金替换时效态合金以直接实现较大厚度时效强化型铜合金的连续爆炸叠合来制备较长大厚度铜板的基础上，又发展出交替采用爆炸叠合与冷变形+再结晶处理实现复合板长度延伸、焊接界面消除和变形能力恢复从而以叠合-延伸方式制造超长大厚度铜板的新方法。

 

Enhancing explosive weldability of thick precipitate-hardened alloys

 

Yake Wu^a, Rong Wu^a, Mingyu Zhang^a, Sai Tan^b, Junyong Lu^{b, **} and Feng Jiang^{a, *}

^a State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, 710049, China

^b National Key Laboratory for Vessel Integrated Power System Technology, Naval University of Engineering, Wuhan, 430033, China

Abstract

Explosive welding of high-strength precipitate-hardened alloys in large thickness was very challenging but was increasingly desired with the continuous development of high-end equipment. An innovative strategy, which was previously proposed to achieve joining at the supersaturated state at first and improve the composite properties by later thermal treatment, was validated here using a Cu-Ni-Si-Cr alloy as a model material. Under the same welding condition, the composite welded at the supersaturated state exhibited a larger wave amplitude than that joined at the peak-aged state, an evident proof of better weldability. Further numerical analysis indicated that the enhanced weldability of the supersaturated alloy was closely related with its lower deformation resistance. The composite joined at the supersaturated state achieved a slightly lower peak hardness and yield strength than the counterpart for the thermally weakened deformation hardening effects and the more interfacial defects, while the electrical conductivity of them was comparable.