基于调幅分解和多尺度析出协同作用的Cu−19Ni−6Cr−7Mn合金强化行为%Unanticipated strengthening of Cu?19Ni?6Cr?7Mn alloy achieved by synergistic effect of spinodal decomposition and multiscale precipitation
河南科技大学 有研工程技术研究院有限公司 河南省科学院
2026-02-05
Cu-Ni-Cr-Mn合金 力学性能 纳米析出相 调幅分解 弹性模量
研究了Cu?19Ni?6Cr?7Mn合金在时效过程中的显微组织演变.结果表明:500℃时效 120 min的合金力学性能最佳,其抗拉强度和弹性模量分别为 978 MPa 和 145.8 GPa.500℃时效 240 min 的合金弹性模量达到149.5 GPa,为目前具有较高弹性模量的铜合金.值得一提的是,500℃时效 5 min的合金其抗拉强度从 740 MPa迅速升高到 934 MPa,接近最大值(978 MPa).对潜在的强化机制和相变行为的分析表明,Cu?19Ni?6Cr?7Mn合金在 500℃时效 5 min过程中发生调幅分解和DO22 有序化,并出现L12 有序相和bcc-Cr颗粒.调幅分解产生的应力场、纳米级有序相和Cr颗粒是Cu?19Ni?6Cr?7Mn合金力学性能提高的主要原因.%The microstructural evolution of Cu?19Ni?6Cr?7Mn alloy during aging treatment was investigated.After aging for 120 min at 500℃,the alloy exhibited excellent mechanical properties,including a tensile strength of 978 MPa and an elastic modulus of 145.8 GPa.After aging for 240 min at 500℃,the elastic modulus of the alloy reached 149.5 GPa,which was among the highest values reported for Cu alloys.It was worth mentioning that the tensile strength increased rapidly from 740 to 934 MPa after aging for 5 min at 500℃,which was close to the maximum tensile strength(978 MPa).Analysis of the underlying strengthening mechanisms and phase transformation behavior revealed that the Cu?19Ni?6Cr?7Mn alloy underwent spinodal decomposition and DO22 ordering during the first 5 min of aging at 500℃,and L12 ordered phases and bcc-Cr precipitates appeared.Therefore,the enhanced mechanical properties of the Cu?19Ni?6Cr?7Mn alloy can be attributed to the stress field generated by spinodal decomposition and the presence of nanoscale ordered phase and Cr precipitates.
