强塑性形变制备Cu-Fe过饱和固溶体
Homogeneous Cu-Fe super saturated solid solutions prepared by severe plastic deformation
摘要：
通过在高压下在各种应变速率和温度下扭转来加工含有分散在铜基体中的50 nm厚的铁细丝的Cu-Fe纳米复合材料。所得纳米结构的特征在于透射电子显微镜，原子探针断层扫描和穆斯堡尔光谱。结果表明，α-Fe细丝在剧烈的塑性形变过程中溶解，形成约12 at.%的均匀过饱和固溶体fcc Cu中的Fe。溶解速率与总塑性应变成正比，但对应变速率不太敏感。对于在液氮温度下处理的样品，发现了类似的结果。APT数据显示，不对称的成分梯度，导致变形诱导的混合。在此基础上，讨论了过饱和固溶体的形成
英文摘要：
A Cu-Fe nanocomposite containing 50 nm thick iron filaments dispersed in a copper matrix was processed by torsion under high pressure at various strain rates and temperatures. The resulting nanostructures were characterized by transmission electron microscopy, atom probe tomography and Mössbauer spectrometry. It is shown that alpha-Fe filaments are dissolved during severe plastic deformation leading to the formation of a homogeneous supersaturated solid solution of about 12 at.% Fe in fcc Cu. The dissolution rate is proportional to the total plastic strain but is not very sensitive to the strain rate. Similar results were found for samples processed at liquid nitrogen temperature. APT data revealed asymmetric composition gradients resulting from the deformation induced intermixing. On the basis of these experimental data, the formation of the supersaturated solid solutions is discussed
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