Abstract Mo–Cu composites exhibit excellent physical and mechanical properties, while the problems of densification and interface seriously limit their application. In this paper, the effect of element Zr on the properties of Mo–Cu composites is investigated aiming to overcome these critical issues. Various compositions of Mo–Cu–Zr ternary composites were fabricated via ball milling, cold isostatic pressing and microwave sintering. Microstructures and mechanical properties of the prepared composites were systematically characterized and analyzed. The results show that the density and mechanical properties of the composites increase with the increase of Zr content, and the 50Mo30Cu20Zr composite achieves the highest relative density of 97.6%, hardness of 314.4 HV and compressive strength of 805.9 MPa. The increase of Zr content reduces the sintering activation energy and leads to the improvement of density. Simultaneously, the element Zr can form solid solutions and in-situ synthesis intermetallic compounds with Cu matrix, which leads to solid solubility strengthening and dispersion strengthening. Moreover, the interface between Mo and Cu phase is found to have been reinforced by the in-situ intermetallic compound particles embedded in the interface. This work provides an important reference for research of densification and mechanical property of Mo–Cu composites.

中文翻译：

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微波烧结Mo-Cu-Zr复合材料的显微组织和力学性能

摘要 Mo-Cu复合材料具有优异的物理力学性能，但致密化和界面问题严重限制了其应用。在本文中，研究了元素 Zr 对 Mo-Cu 复合材料性能的影响，旨在克服这些关键问题。通过球磨、冷等静压和微波烧结制备了各种成分的 Mo-Cu-Zr 三元复合材料。对制备的复合材料的微观结构和机械性能进行了系统表征和分析。结果表明，复合材料的密度和力学性能随着Zr含量的增加而增加，其中50Mo30Cu20Zr复合材料的相对密度最高，达到97.6%，硬度达到314.4 HV，抗压强度达到805.9 MPa。Zr含量的增加降低了烧结活化能并导致密度的提高。同时，元素Zr可以与Cu基体形成固溶体和原位合成金属间化合物，从而导致固溶强化和弥散强化。此外，发现 Mo 和 Cu 相之间的界面已被嵌入界面中的原位金属间化合物颗粒增强。该工作为研究Mo-Cu复合材料的致密化和力学性能提供了重要参考。发现 Mo 和 Cu 相之间的界面已被嵌入界面中的原位金属间化合物颗粒增强。该工作为研究Mo-Cu复合材料的致密化和力学性能提供了重要参考。发现 Mo 和 Cu 相之间的界面已被嵌入界面中的原位金属间化合物颗粒增强。该工作为研究Mo-Cu复合材料的致密化和力学性能提供了重要参考。