累积叠轧制备Ti/Ni多层复合材料的组织演变与力学性能研究

Microstructure evolution and mechanical properties of the Ti/Ni multilayer composite produced by accumulative roll bonding

摘要:

本文以工业纯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,ARB5道次后,Ti、Ni层的平均晶粒尺寸分别为200 nm和300 nm；复合材料的抗拉强度、显微硬度和界面结合强度显著提高,ARB5道次后抗拉强度达到810 MPa,延伸率为24.4%,Ti、Ni层平均显微硬度分别为233 HV和229 HV。在ARB1-5道次轧制变形过程中,界面处无明显的原子扩散现象发生。

Abstract:

In this paper, Ti/Ni composites material with Multi-layered structure was produced by accumulative roll bonding (ARB) process. The micro-structure and interface structure of composites material were analyzed by scanning electron microscope, energySdisperseSspectroscopy, and transmissionSelectronSmicroscope. The mechanical propertiesSof composite material in different ARB cycles were tested by universal material testing machine and micro-hardness tester. The results show that the micro-structure of Ti layer and Ni layer of composites material was obviously refined. Ultrafine grains with the size of 200 um ~ 300 um is acquired in both Ti and Ni layer. And the micro-structureShomogeneity, the tensile strength, micro-harded and interfacial bonding strength were improved with the increasing of ARB cycles. After ARB 5 cycles, the tensile strength was 810 MPa, the elongation was 24.4%, and the average micro-hardness of Ti layer and Ni Layer is 233 HV and 229 HV. There is no obvious diffusion at the interface of Ti/Ni composites material with multi-layered structure during ARB 1-5 cycles.