Ti-Mo系钛合金β晶粒长大规律及晶粒尺寸对硬度的影响  

Growth Behavior of β-Phase Grain and Influence of Its Grain Size on Hardness in Ti-Mo Alloys

作　　者：卢金文[1,2] 赵永庆[1,2] 葛鹏[2] 周伟[2] 

机构地区：[1]东北大学,辽宁沈阳110819 [2]西北有色金属研究院,陕西西安710016

出　　处：《稀有金属材料与工程》2013年第11期2269-2273,共5页Rare Metal Materials and Engineering

基　　金：国家"973"计划项目(2007CB613805)

摘　　要：对不同Mo含量β单相区锻造的Ti-Mo系二元合金在相变点以上温度进行固溶处理,然后对不同固溶条件下合金的原始β晶粒尺寸进行统计分析,并测试了若干不同晶粒尺寸下合金的硬度。合金的晶粒尺寸统计结果显示:原始β晶粒尺寸不仅与固溶的温度和时间有关,也与合金中Mo元素的含量有关。晶粒尺寸与固溶时间呈指数关系;在固溶时间一定的条件下,晶粒尺寸随固溶温度的升高而增大,随合金中Mo含量的增加而显著减小,Ti-4Mo和Ti-20Mo合金在试验研究温度范围内β晶粒长大激活能分别为83.30l和272.16 kJ/mol。从热力学和动力学角度对Ti-Mo合金晶粒生长规律进行分析。硬度分析结果表明,Ti-Mo合金的硬度随晶粒尺寸的减小而提高,并对影响机理进行了探讨。The effects of molybdenum （Mo） on the growth behavior of β-phase grain and hardness of a series of β forged Ti-Mo alloys under different solution treatment temperatures and solution treatment times were studied with an emphasis on the relationship between β-grain size and hardness.The averageβ-grain sizes under different solution treatment conditions were measured and analyzed.The results show that theβ-grain size is not only relative to solution treatment temperatures and times but also relative to Mo contents from statistical results.Theβ-grain size does not always increase with increasing of solution treatment temperature,a limit value of the grain size will appear in certain temperature region and certain Mo contents.When the Ti-4Mo alloy is solution treated at the range of 900～1050 ℃,the activation energies for grain growth was 83.301 kJ/mol; and When the Ti-20Mo alloy is solution treated at the range of 750～900 ℃,the activation energies for grain growth was 272.16 kJ/moi.The growth behavior of β-phase grain is discussed in terms of grain growth thermodynamics and kinetics laws.Hardness results show that grain size has noticeable influence on hardness and hardness increases with decreasing of grain size.

关 键 词：钛合金 TI-MO合金 固溶处理 晶粒长大 硬度 

分 类 号：TG146.23[一般工业技术—材料科学与工程]