Effects of multiple trace alloying element Fe and Cr addition on the solid solution-treated Cu-4 wt% Ti alloys were studied with respect to microstructure and mechanical properties. It was elucidated that the addition of trace alloying elements results in the formation of intermetallic phase CuTi, lowering the titanium content of Cu solid solution phase, and refining the microstructure. The contributions of different strengthening mechanisms were calculated, which are in good agreement on experimental results. It turns out that the solute solution strengthening in Cu- Ti alloys plays a crucial role, even though the fine grain size and precipitation strengthening mechanism are contributed to the strength of Cu-Ti-Cr -Fe alloys. Therefore, the Cu-Ti-Cr-Fe alloys exhibits lower strength and higher elongation compared with Cu-4 wt% Ti alloys. However, Cu-Ti-Cr-Fe alloys show a great potential to balance the mechanical properties and electrical conductivity during aging treatment as the titanium content decreases in the Cu matrix, and the strength is higher than that of others in previous study.

从微观结构和力学性能的角度研究了添加多种痕量合金元素Fe和Cr对固溶处理的Cu-4 wt％Ti合金的影响。阐明了微量合金元素的添加导致金属间相CuTi的形成，降低了Cu固溶体相的钛含量，并细化了显微组织。计算了不同强化机制的贡献，与实验结果非常吻合。结果表明，即使细小的晶粒尺寸和沉淀强化机制对Cu-Ti-Cr-Fe合金的强度有贡献，Cu-Ti合金中的固溶体强化也起着至关重要的作用。因此，与Cu-4wt％的Ti合金相比，Cu-Ti-Cr-Fe合金表现出较低的强度和较高的伸长率。然而，