Strength and conductivity of Cu-9Fe-1.2X (X = Ag or Cr) filamentary microcomposite wires
Strength and conductivity of Cu-9Fe-1.2X (X = Ag or Cr) filamentary microcomposite wires
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DOI：
10.1007/s11661-001-0356-7
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发表时间：
2001-04
期刊：
影响因子：
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通讯作者：
S. Hong;J. S. Song
中科院分区：
文献类型：
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作者：
S. Hong;J. S. Song
本文研究了冷拔结合中间热处理制备的cu - 9fe -1.2 2x （X = Ag或Cr）微复合丝的强度和电导率。在冷加工过程中，一次枝晶臂和二次枝晶臂沿拉伸方向排列并拉长成细丝。在整个拉伸过程中，在给定的拉伸比下，Ag的添加可以减少长丝间距。Cu-Fe-Ag微复合材料的极限拉伸强度和电导率均高于Cu-Fe-Cr微复合材料，表明细丝的细化比细丝的强化更有效。Cu-Fe-Xi微复合材料的强度取决于铁丝的间距，并符合Hall-Petch关系。所有试样断口均表现为延性断口，断口偶见铁丝。与Cu-Fe-Cr线相比，Cu-Fe-Ag线的细丝分布更为均匀，这可能是Cu-Fe-Ag线具有良好的机械性能和电气性能的原因。中间热处理后Cu-Fe-Ag和Cu-Fe-Cr的电导率增加是由于在大变形过程中溶解的Fe、Cr或Ag颗粒的析出。
In this study, strength and electrical conductivity of Cu-9Fe-1.2X (X = Ag or Cr) microcomposite wires obtained by cold drawing combined with intermediate heat treatments have been investigated. During cold working, the primary and secondary dendrite arms are aligned along the drawing direction and elongated into filaments. The addition of Ag was found to reduce the filament spacings at the given draw ratio throughout the drawing processing. The ultimate tensile strength and the conductivity of the Cu-Fe-Ag microcomposites were higher than those of Cu-Fe-Cr microcomposites, suggesting the refinement of the filaments is more effective than the strengthening of the filaments in strengthening the microcomposites. The strength of Cu-Fe-Xi microcomposites is dependent on the spacing of the Fe filaments in accord with a Hall-Petch relationship. The fracture surfaces of all the specimens showed ductile-type fracture and iron filaments occasionally observed on the fracture surfaces. The good mechanical and electrical properties in Cu-Fe-Ag wires may be associated with the more uniform distribution of the filaments than in Cu-Fe-Cr wires. The increase of the conductivity in Cu-Fe-Ag and Cu-Fe-Cr after intermediate heat treatments is attributed to the precipitation of Fe, Cr, or Ag particles, which dissolved during heavy deformation processing.