近α型Ti70合金的吸氢行为研究  

Hydrogen Absorption Behavior of Near α Ti70 Alloy

作　　者：王佳[1] 刘晓勇[1] 高灵清[1,2] 查小琴 罗先甫[1] 张文利 张恒坤[1] WANG Jia;LIU Xiaoyong;GAO Lingqing;ZHA Xiaoqin;LUO Xianfu;ZHANG Wenli;ZHANG Hengkun(Luoyang Ship Material Research Institute,Luoyang 471023,China;Henan Key Laboratory of Technology and Application of Structural Materials for Ships and Marine Equipments,Luoyang 471023,China)

机构地区：[1]中国船舶重工集团公司第七二五研究所,洛阳471023 [2]河南省船舶及海工装备结构材料技术与应用重点实验室,洛阳471023

出　　处：《中国腐蚀与防护学报》2021年第4期549-554,共6页Journal of Chinese Society For Corrosion and Protection

摘　　要：采用电解充氢的方法对Ti70合金试样充氢,并用气体分析仪和金相显微镜(OM)对其氢含量和显微组织进行表征,以探究微观组织、扩散方向以及比表面积对吸氢行为的影响。结果表明:Ti70合金的吸氢能力随β相的连续程度增大而升高,原因在于具有bcc结构的β相提供了更多的四面体间隙,成为H更易扩散的通道;进入试样的H在宏观上呈非均匀分布,含量由试样表面向心部迅速降低,且H沿轧制方向的扩散能力明显大于板厚方向,这是由于沿板厚方向扩散时,拉长的α晶粒成为氢扩散的阻力,而在轧制方向狭长的连续β相更利于H的渗入;随试样比表面积增大,吸H量显著上升,进一步表明H沿表面吸入后难以充分向内扩散,导致单位体积对应的表面积越大吸氢能力越强。The hydrogen absorption behavior of Ti70 alloy was studied by electrolytic hydrogen charging and then characterized via hydrogen analyzer and metallographic microscope. The relationship between the hydrogen content with the microstructure, diffusion direction and specific surface area of Ti70 alloy was examined. The results show that the increased continuity of β phase strongly facilitates the absorption capacity of Ti70 alloy, whereas, the β phase provides more tetrahedral interstitial sites,becoming the easier diffusion path for H. The distribution of H in the alloy is macroscopically non-uniform.The H content shows a sharp decreasing from the surface to the interior. The diffusion of H along the thickness direction is much more difficult than the rolling direction. This should be attributed to the blocking effects caused by the elongated α phase in the thickness direction and the more continuous βphase along the rolling direction. The H absorption capacity was found to increase with the specific surface area of the alloy sample, which further proved that the absorbed H is not sufficiently diffused in the alloy sample, as a result, the larger the surface area per unit volume, the higher the H absorption capacity.

关 键 词：Ti70合金 显微组织 扩散方向 比表面积 吸氢能力 

分 类 号：TG146[一般工业技术—材料科学与工程]