Experiment and modeling of TiB_(2)/TiB boride layer of Ti−6Al−2Zr−1Mo−1V alloy  

Ti−6Al−2Zr−1Mo−1V合金TiB_(2)/TiB渗硼层实验和模拟

作　　者：De-lai OUYANG Sheng-wei HU Cheng TAO Xia CUI Zhi-shou ZHU Shi-qiang LU 欧阳德来;胡圣伟;陶成;崔霞;朱知寿;鲁世强(南昌航空大学江西省金属材料微结构调控重点实验室,南昌330063;北京航空材料研究院,北京100095)

机构地区：[1]Key Laboratory for Microstructural Control of Metallic Materials of Jiangxi Province,Nanchang Hangkong University,Nanchang 330063,China [2]Beijing Institute of Aeronautical Materials,Beijing 100095,China

出　　处：《Transactions of Nonferrous Metals Society of China》2021年第12期3752-3761,共10页中国有色金属学报（英文版）

基　　金：The authors are grateful for the financial supports from the National Natural Science Foundation of China(Nos.51761029,51864035);the Natural Science Foundation of Jiangxi Province,China(Nos.2020BABL204011 and 2020BABL204007);Key Laboratory for Microstructural Control of Metallic Materials of Jiangxi Province(Nanchang Hangkong University),China(Nos.EJ201701513 and EJ201901454).

摘　　要：The influence of the boriding conditions on the boride layers was examined by boriding Ti−6Al−2Zr−1Mo−1V alloy in the temperature range of 920−1120℃.The experimental results show that the boride layers were composed of a continuous thin outer layer of TiB_(2) and a thick inner layer of TiB with whiskers or needle-like morphologies that extended into the substrate.Thick and compact boride layers were obtained when the boriding temperatures were 1000−1080℃,and the treatment time exceeded 8 h.The boride layer depth increased with the boriding temperature and time,and the growth kinetics of the boride layers was characterized by a parabolic curve.The growth kinetics of the boride layers,including both TiB_(2) and TiB layers,were predicted by establishing a diffusion model,which presented satisfactory consistency with the experimental data.As a result,the activation energies of boron in the TiB_(2) and TiB layers were estimated to be 223.1 and 246.9 kJ/mol,respectively.对Ti−6Al−2Zr−1Mo−1V合金在920~1120℃温度范围进行渗硼处理,研究渗硼条件对渗硼层的影响。结果表明,渗硼层由外部连续薄TiB_(2)层和里层厚TiB层组成,TiB相呈魏氏体状或针状形貌嵌入基体。在渗硼温度为1000~1080℃、渗硼时间超过8 h渗硼时可获得厚而致密的渗硼层。渗硼层厚度随渗硼温度和渗硼时间增加而增加。渗硼层生长动力学曲线呈抛物线特征。建立TiB_(2)和TiB层生长动力学的预测模型,其计算结果与实验数据达到较好吻合。确定TiB_(2)和TiB激活能分别为223.1和246.9 kJ/mol。

关 键 词：Ti−6Al−2Zr−1Mo−1V alloy BORIDING MICROSTRUCTURE modeling 

分 类 号：TG174.445[金属学及工艺—金属表面处理]