(1. 中国船舶重工集团公司 第七二五研究所，洛阳 471039；
2. 厦门大学 材料学院，厦门 361005)
摘 要: 为掌握B元素的添加对Ti-9V-3Al-4Sn-5Mo合金显微组织和力学性能的影响规律，采用电子探针微区分析仪(EPMA)、光学显微镜(OM)、扫描电镜(SEM)、万能试验机(UTM)等设备，详细研究(Ti-9V-3Al-4Sn-5Mo)1-xBx(x=0，0.04，0.08)合金的成分、显微组织与力学性能等。研究结果表明：B的添加可以明显细化Ti-9V-3Al-4Sn-5Mo合金的晶粒，且B元素在合金中以TiB相的形式存在。随着B质量分数(0，0.04%，0.08%)的增加，TiB相的质量分数亦逐渐增加，轧制态和固溶态合金的强度亦逐渐增加，时效态合金的强度先增加后减少。轧制态、固溶态以及时效态合金的塑性均先增加后减少。
关键字: Ti-9V-3Al-4Sn-5Mo合金；B元素；TiB相；显微组织；力学性能
（1. Luoyang Ship Material Research Institute, Luoyang 471039, China,
2. College of Materials, Xiamen University, Xiamen 361005, China）
Abstract:In order to understand the effect of minor boron additions on microstructures and mechanical properties of Ti-9V-3Al-4Sn-5Mo alloy, the chemical compositions, microstructures and mechanical properties of (Ti-9V-3Al-4Sn-5Mo)1-xBx (x=0, 0.04, 0.08) alloys were systematically studied by electron probe micro-analyzer (EPMA), optical microscope (OM), scanning electron microscope (SEM) and universal testing machine (UTM). The obtained results are described as follows: B additions can obviously refine the crystal grains of Ti-9V-3Al-4Sn-5Mo alloy, and exist in the form of TiB phases. With increasing B additions (0, 0.04%, 0.08%), the contents of TiB phase and the tensile strength of the rolled and solution-treated alloys increase, while the tensile strength of the aged alloys first increases and then decreases. The ductility of the rolled, solution-treated and aged alloys first increases and then decreases.
Key words: Ti-9V-3Al-4Sn-5Mo alloy; boron; TiB phase; microstructure; mechanical property
