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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing >Microstructure and strength of Cu-Fe-Ag in situ composites
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Microstructure and strength of Cu-Fe-Ag in situ composites

机译：Cu-Fe-Ag原位复合材料的组织和强度

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摘要

Three Cu-Fe-Ag in situ composites, i.e. Cu-14 wt.%Fe-1 wt.%Ag, Cu-14 wt.%Fe-3 wt.%Ag and Cu-11 wt.%Fe-6 wt.%Ag were prepared by cast and drawn process. Microstructure evolution and mechanical properties of the composites were investigated. The results show that the presence of Ag can strengthen the composite and the fracture surfaces of Cu-Fe-Ag composites exhibit shear characteristics at lower draw ratio. The ultimate strength of the above three Cu-Fe-Ag composites reached 1119 MPa, 1578 MPa and 1357 MPa in sequence at draw ratio η = 6.1, however that of the same processed Cu-12 wt.%Fe is only 978 MPa. The higher strength of Cu-Fe-Ag results from the strengthening effect of Ag: (1) refining the primary Fe dendrites and reducing the spacing between the filaments; (2) solution and precipitation strengthening the copper matrix and (3) strengthening the composite in the form of aligned Ag filaments if the amount Ag is enough for the formation of Cu-Ag eutectic under certain solidification conditions.
机译：三种Cu-Fe-Ag原位复合材料，即Cu-14wt。％Fe-1wt。％Ag，Cu-14wt。％Fe-3wt。％Ag和Cu-11wt。％Fe-6wt。通过铸造和拉丝工艺制备％Ag。研究了复合材料的微观结构演变和力学性能。结果表明，Ag的存在可以增强复合材料，而Cu-Fe-Ag复合材料的断裂表面在较低的拉伸比下具有剪切特性。在拉伸比η= 6.1时，上述三种Cu-Fe-Ag复合材料的极限强度依次达到了1119 MPa，1578 MPa和1357 MPa，但是相同的Cu-12 wt。％Fe的极限强度仅为978 MPa。 Cu-Fe-Ag的较高强度归因于Ag的增强作用：（1）细化初生的Fe树枝状晶体并减小细丝之间的间距； （2）如果在一定的凝固条件下，Ag的含量足以形成Cu-Ag共晶，则（2）固溶和沉淀可强化铜基体，以及（3）以排列的Ag丝形式增强复合材料。

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