新型高强度易加工Cu-FeC复合材料的变形行为  

Deformation Behaviors of Advanced Cu-FeC Composite with High Strengths and Processability

作　　者：郭明星[1] 杜进清 易龙[1] Guo Mingxing;Du Jinqing;Yi Long(State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]北京科技大学新金属材料国家重点实验室,北京100083

出　　处：《稀有金属材料与工程》2020年第1期281-287,共7页Rare Metal Materials and Engineering

基　　金：北京市自然科学基金(2172038);国家自然科学基金(51871029,51571023,51301016)。

摘　　要：采用真空感应熔炼和快速凝固技术制备了界面复合良好,组织性能优异的新型Cu-FeC复合材料,并通过OM、SEM、TEM、XRD以及力学性能测试分别对熔铸态、奥氏体化后的淬火态及其冷轧态复合材料的组织和变形行为进行了研究。结果表明,熔铸态材料内共存有γ-Fe、α-Fe和马氏体相,而经820℃,4 min奥氏体化和淬火处理后,基体内初生Fe-C相可转化为马氏体相,同时析出大量纳米级γ-Fe相粒子;前者在冷轧过程中表现出较好的协调变形性能,而后者会在粗大Fe-C马氏体相内部或附近产生微裂纹;不过两者冷轧变形后的强度均能获得大幅提升,最高抗拉强度达515 MPa,而延伸率又明显高于已报道具有类似强度陶瓷粒子强化铜基复合材料的延伸率,且拉伸过程均表现出明显的塑性变形特征;此外,本研究根据复合材料组织演化规律提出了相应的组织演化模型图。An advanced Cu-FeC composite material with good interface bonding was prepared by vacuum induction melting and rapid solidification technology.The microstructure evolution and deformation behaviors of the composites in the as-cast,austenitizing+quenching and cold rolling states were studied by OM,SEM,TEM,XRD characterization and mechanical property measurements.The results show thatγ-Fe,α-Fe and martensite phase coexist in the as-cast composite;however,after the treatment of austenitizing(820 oC/4 min)+quenching the primary Fe-C phase in the matrix can be transformed into martensite,and a large number of nano-sizedγ-Fe phase particles can be also formed.The composite in the as-cast state possesses a better deformability during cold rolling process,while micro cracks could be formed in the coarse Fe-C martensite phases or around them in the quenched composite during cold rolling.The strengths of the composites could be increased significantly after cold rolling,and the highest tensile strength could reach about 515 MPa,but the plastic deformation characteristics still can be seen in them.Additionally,their elongations are much higher than those of the reported ceramic particles reinforced copper matrix composites with similar strengths.Finally,based on the microstructure evolution of Cu-FeC composite material,the deformation and fracture models of the composites with different microstructure characteristics were put forward.

关 键 词：Cu-FeC复合材料 Fe-C相 相变 变形行为 模型 

分 类 号：TB333[一般工业技术—材料科学与工程]