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利用工业纯金属制备了Cu-9Ni-6Sn和Cu-9Ni-6Sn-X(X=Cr或Nb、Ti)合金试样。通过X射线衍射分析、透射电镜观察和力学性能的测定,研究了Cr、Nb、Ti和预冷变形对Cu-9Ni-6Sn合金拐点分解行为与力学性能的影响。预冷变形可显著提高合金的强度,这是冷变形硬化和调幅结构与位错之间的交互作用的结果。预冷变形显著缩短达到峰值强度的时间,这是拐点分解强化和再结晶软化共同作用的结果,但不足以证明预冷变形可加速拐点分解。含少量Cr的合金,厚度为0.2mm的带材试样,经93％预冷变形和300℃时效处理后,最高抗拉强度σ_b
Samples of Cu-9Ni-6Sn and Cu-9Ni-6Sn-X (X = Cr or Nb, Ti) alloys were prepared using commercial pure metals. The effects of Cr, Nb, Ti and pre-cooling deformation on the inflection point decomposition behavior and mechanical properties of Cu-9Ni-6Sn alloy were investigated by X-ray diffraction, transmission electron microscopy and mechanical properties. Pre-cooling deformation can significantly improve the strength of the alloy, which is the result of cold deformation hardening and the interaction between the amplitude modulation structure and dislocations. Pre-cooling deformation significantly shortens the time to reach the peak strength, which is the result of inflection decomposition strengthening and recrystallization softening together, but it is not enough to prove that pre-cooling deformation can accelerate inflection decomposition. With a small amount of Cr alloy, a strip thickness of 0.2mm sample, 93% pre-cooling deformation and aging at 300 ℃, the highest tensile strength σ_b