固溶前冷轧压下率对Cu-Ni-Si-Mg合金组织与性能的影响

发布时间：2018-05-07 14:05

本文选题：Cu-Ni-Si-Mg合金 + 轧制压下率　；参考：《材料科学与工艺》2015年05期

【摘要】：为了优化Cu-Ni-Si-Mg合金的轧制工艺参数,利用光学显微镜(OM)、扫描电镜(SEM)、透射电镜(TEM)、能谱(EDS)和X射线衍射(XRD)等手段,对固溶前不同冷轧压下率下的Cu-Ni-Si-Mg合金时效态的组织性能及拉伸断口进行了分析.结果表明:随着冷轧压下率的增加,Cu-Ni-Si-Mg合金的平均晶粒尺寸逐渐增加,屈服强度、硬度和延伸率先增大后减小,抗拉强度表现为先增大,后在710 MPa左右波动,再减小的趋势;压下率从94%增加到96%,晶粒尺寸从12μm增加到52μm,而抗拉强度变化较小,归因于低压下时Cu-Ni-Si-Mg合金的细晶强化和时效强化占主导,而大压下时第二相粒子均匀的时效析出弥补了因晶粒粗大而造成的抗拉强度损失;压下率为93%时,合金的断裂为单一的韧性断裂,压下率为97%时,合金的断裂由韧性断裂和沿晶脆性断裂组成.
[Abstract]:In order to optimize the rolling process parameters of Cu-Ni-Si-Mg alloy, optical microscope, scanning electron microscope, transmission electron microscope (TEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD) were used. The microstructure, properties and tensile fracture of Cu-Ni-Si-Mg alloy under different cold rolling pressure rates before solution solution were analyzed. The results show that the average grain size of Cu-Ni-Si-Mg alloy increases gradually with the increase of cold rolling reduction rate. The yield strength, hardness and extension of Cu-Ni-Si-Mg alloy increase first and then decrease, and the tensile strength increases first, then fluctuates at 710 MPa or so, and then decreases. The reduction rate increased from 94% to 96%, and the grain size increased from 12 渭 m to 52 渭 m, while the tensile strength changed slightly, which was attributed to the dominance of fine grain strengthening and aging strengthening of Cu-Ni-Si-Mg alloy at low pressure. The uniform aging precipitation of the second phase particles at high pressure makes up for the loss of tensile strength caused by the coarse grain size, and when the reduction rate is 933, the fracture of the alloy is a single ductile fracture, and the reduction rate is 97%. The fracture of the alloy consists of ductile fracture and intergranular brittle fracture.
【作者单位】：江西理工大学材料科学与工程学院;
【基金】：江西省教育厅科技项目(GJJ14445)
【分类号】：TG339;TG146.11

【参考文献】