多相V-Ti-Ni氢分离合金显微组织与力学性能

Microstructure and mechanical properties of multiphase V-Ti-Ni hydrogen separation alloys

摘要:

V-Ti-Ni合金的显微组织不仅影响氢分离性能,还将影响力学性能以及成形性能。本文研究了多相V100-2x-Tix-Nix (X=10, 15, 20)系列氢分离合金的显微组织、硬度和拉伸性能。V100-2x-Tix-Nix合金铸锭显微组织均由枝晶相V基固溶体和枝晶间相NiTi和NiTi2组成。随着合金中Ti和Ni的含量增加,枝晶间相在合金中体积占比增大,形成连续网状,阻止枝晶臂的连接。在室温下,合金整体硬度、抗拉强度、延伸率和断面收缩率均随Ti、Ni含量增加而升高。V基固溶体和NiTi2相是影响三种合金的整体硬度的主要因素。三种合金在室温下均属于脆性材料。合金中NiTi相含量对合金的延伸率有较大影响。

Abstract:

The microstructure of V-Ti-Ni alloy affects not only the hydrogen separation performance, but also the mechanical properties and formability. The microstructure, hardness and tensile properties of multiphase V100-2x-Tix-Nix (X=10, 15, 20) alloys for hydrogen separation were investigated. The microstructure of V100-2x-Tix-Nix alloys ingot consists of dendritic phase (V base solid solution) and interdendritic phase (NiTi and NiTi2). With the increase of the content of Ti and Ni in the alloy, the volume ratio of interdendritic phase in the alloy increases, and blocks the connection of dendrite arm due to forming a continuous network. At room temperature, the bulk hardness, tensile strength, elongation and reduction of area of the alloy increase with the increase of Ti and Ni content. V based solid solution and NiTi2 phase are the main factors affecting the bulk hardness of the three alloys. The three alloys are brittle materials at room temperature. The content of NiTi in the alloy has a great influence on the elongation of the alloy.