Microstructure and tensile properties of nanostructured Cu-25wt%Ag
Microstructure and tensile properties of nanostructured Cu-25wt%Ag
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DOI：
10.1016/s1359-6454(02)00468-8
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发表时间：
2003-02
期刊：
影响因子：
9.4
通讯作者：
Ke Han;A. A. Vasquez-A.;Y. Xin;P. Kalu
中科院分区：
文献类型：
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作者：
Ke Han;A. A. Vasquez-A.;Y. Xin;P. Kalu
纳米Cu-25wt%Ag合金的显微组织和织构与其相变、制备和力学性能有关。通过透射电子显微镜、扫描电子显微镜、X射线织构、拉伸试验和分析建模进行了分析。模型中的Cu-25wt%Ag合金由两个组分描述：（1）共晶组分，即纳米Cu和Ag的复合物;（2）先共晶Cu组分，在低于共晶温度下形成的Ag纳米纤维嵌入其中。在铸态和锻态试样中，Cu和Ag在先共晶组元中始终存在立方对立方的取向关系，但仅在选定的共晶区存在取向关系。在铸造、锻造和拉拔的Cu-Ag材料中，只有在先共晶区的取向关系保持相同。变形通过减小两种组分中线材径向方向上的各种Cu和Ag相的尺寸来提高材料的拉伸强度。
The microstructure and textures of nanostructured Cu-25wt%Ag are shown to relate to its phase transformation, fabrication and mechanical properties. The analysis was undertaken by transmission electron microscopy, scanning electron microscopy, X-Ray texture, tensile tests and analytical modeling. The Cu-25wt%Ag is described by two components in the model: (1) eutectic component which is a composite of nanosized Cu and Ag (2) proeutectic Cu component embedded with Ag nano-fibers formed below the eutectic temperature. In both cast and forged samples, the Cu and Ag always have cube-on-cube orientation relationship in proeutectic component, but they have the orientation relationship only in selected eutectic areas. The orientation relationship maintains the same in cast, forged and drawn Cu-Ag materials only in proeutectic regions. The deformation enhances the tensile strength of the materials by decreasing the size of various Cu and Ag phases in the radial direction of the wire in both components.