Microstructure and properties of Cu2 Fe2Ag in2situ composites
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摘要: 系统研究了合金元素Ag 对Cu2 Fe 原位复合材料微观组织、力学性能和导电性能的影响规律。采用熔铸2 形变法分别制备了Cu2 12 wt%Fe、Cu214 wt%Fe2 1 wt%Ag、Cu2 14 wt%Fe2 3 wt%Ag 和Cu2 11 wt%Fe2 6 wt%Ag4 种原位复合材料。测试了不同应变下材料的抗拉强度和电阻率。采用扫描电镜(SEM) 观察了材料的微观组织演变和拉伸断口形貌, 用能谱仪( EDS) 分析了Fe 和Ag 在Cu 基体中的分布。结果表明, 添加Ag 可以细化初生的Fe 枝晶, 强化Cu 基体, 降低高温下Fe 在Cu 中的固溶度, 材料的强度和电导率同时得到提高。但添加Ag 后, 材料的塑性变形能力降低, 在较低的应变下, 拉伸试样的断口就表现出剪切断裂特征。
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关键词:
- Cu2 Fe2 Ag /
- 原位复合材料 /
- 微观组织 /
- 强度 /
- 电导率
Abstract: The effect s of Ag on the microstr ucture and mechanical and electrical proper ties of Cu2 Fe in2situ com2posit es were investigated. Four in2situ composites, Cu2 12 wt%Fe, Cu2 14 wt%Fe2 1 wt%Ag, Cu2 14 wt%Fe2 3 wt%Agand Cu2 11 wt%Fe2 6 wt%Ag were prepared by the cast and drawn process. T he ult imate tensile st rength and elec2tr ical resistivity of the composites at each draw ratio wer e measur ed. T he microstructure evolution of the compositeswas investigated using scanning electr on micr oscopy ( SEM) and dist ribution of Fe and Ag in the matrix was ana2lyzed by EDS equipped on SEM. The results show that the presence of Ag can refine the primar y Fe dendrites andreduce the solution of Fe in Cu at high temper ature as well, which leads to the simult aneous increment in bothst rength and conduct ivit y. H owever, the Cu2 Fe2 Ag composites show a bit lower plasticity and the fr act ur e surfacesexhibit shear character istic at a lower dr aw r atio.-
Keywords:
- Cu2 Fe2 Ag /
- in-situ composit es /
- microst ruct ur e /
- strength /
- electr ical conductivity
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