新型Cu-Fe-C复相合金的制备及其变形行为

发布时间：2018-05-15 19:01

本文选题：Cu-Fe-C合金 + Fe-C相　；参考：《稀有金属材料与工程》2017年09期

【摘要】：采用真空熔炼和快速凝固方法制备了组织优异的新型Cu-Fe-C复相合金,并通过金相、SEM、TEM、XRD以及力学性能测量分别对复相合金铸态和冷轧态显微组织变化和变形行为进行了研究。结果表明,当凝固界面推移速率满足VcVVp时,微米级和纳米级的Fe-C相可均匀弥散分布于合金基体内,不过微米级Fe-C粒子对应的此速率范围远小于纳米级Fe-C粒子的;由于溶质元素Fe在Cu基体内的固溶和不同尺寸Fe-C相的存在,使得熔铸态复相合金具有较高的加工硬化率(n=0.3628);80%冷轧变形可诱发合金基体内的Fe-C相发生γ-Fe→α-Fe相变,充分利用这一相变可用于调控Cu-Fe-C复相合金的强度和加工变形性能;虽然熔铸态和冷轧态合金均具有较好的协调变形性能,但是相比而言,Fe-C相处于FCC结构时的熔铸态合金可表现出更好的协调变形行为;此外,本文根据复相铜合金的组织演化以及拉伸断口形貌提出了该类合金协调变形和断裂模型示意图。
[Abstract]:A new type of Cu-Fe-C composite alloy with excellent microstructure was prepared by vacuum melting and rapid solidification. The microstructure and deformation behavior of the cast and cold rolled states of the composite alloy were investigated by metallographic, SEM, TEM, XRD and mechanical properties. The results showed that when the velocity of the solidification interface was satisfied to VcVVp, the micron grade and nanofiltration were obtained. The Fe-C phase can be distributed uniformly in the alloy matrix, but the rate range of the micron grade Fe-C particles is much smaller than that of the nanoscale Fe-C particles. Due to the solid solution of the solute element Fe in the Cu base and the existence of the Fe-C phase in the different sizes, the cast alloy has a higher working hardening rate (n=0.3628); 80% cold rolling deformation can be obtained. The phase transition of gamma -Fe to alpha -Fe in the Fe-C phase of the alloy matrix is induced. The full use of this phase transition can be used to regulate the strength and deformation properties of the Cu-Fe-C complex alloy. Although both cast and cold rolled alloys have good coordination deformability, the cast alloy of Fe-C with the structure of FCC can be better than that of Fe-C. Coordinate deformation behavior. In addition, based on the microstructure evolution and tensile fracture morphology of the duplex copper alloy, a schematic diagram of the coordinated deformation and fracture model of the alloy is proposed.

【作者单位】：北京科技大学新金属材料国家重点实验室;
【基金】：国家自然科学基金项目(51301016,51571023) 中央高校基本科研业务费(FRF-TP-14-097A2) 北京市青年“英才”计划项目(YETP0409)
【分类号】：TG146.11

【相似文献】