系统研究了合金元素Ag对Cu-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-形变法分别制备了Cu-12wt%Fe、Cu-14wt%Fe-1wt%Ag、Cu-14wt%Fe-3wt%Ag和Cu-11wt%Fe-6wt%Ag 4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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