累积叠轧制备Ti/Ni多层复合材料的组织演变与力学性能

Microstructure Evolution and Mechanical Properties of the Ti/Ni Multilayer Composite Produced by Accumulative Roll Bonding

以工业纯Ti、纯Ni板材为初始材料,采用累积叠轧法（ARB）制备出Ti/Ni多层复合板材料。利用扫描电镜、透射电镜、万能材料试验机、显微硬度仪对复合材料的组织、界面结构和力学性能进行观察和测试分析。结果表明：随着轧制道次的增加,复合材料中Ti层和Ni层显微组织细化明显,均匀程度提高,ARB 5道次后,Ti、Ni层的平均晶粒尺寸分别为200和300 nm;复合材料的抗拉强度、显微硬度显著提高;ARB 5道次后抗拉强度达到810 MPa,延伸率为24.4%,Ti、Ni层平均HV显微硬度分别为2.33和2.29 GPa。在ARB 0～5道次轧制变形过程中,界面处无明显的原子扩散现象发生。

Ti/Ni composite material with multi-layered structure was prepared by an accumulative roll bonding（ARB） process. The microstructure and interface structure of the composite material were analyzed by scanning electron microscope, energy disperse spectroscopy, and transmission electron microscope. The mechanical properties of the composite material in different ARB cycles were tested by universal material testing machine and microhardness tester. The results show that the microstructure of Ti layer and Ni layer of the composites material is remarkably refined with more ARB cycles. After ARB 5 cycles, the average grain size of Ti layer and Ni layer is 200 and 300 nm, respectively. Moreover, the microstructure homogeneity, the tensile strength and microhardness improve with the increasing of ARB cycles. After ARB 5 cycles, the tensile strength is 810 MPa, the elongation is 24.4%, and the average HV microhardness of Ti layer and Ni layer is 2.33 and 2.29 GPa, respectively. There is no obvious diffusion at the interface of Ti/Ni composite material with multi-layered structure during ARB 0～5 cycles.