摘要
研究TA15和TA2两种α型钛合金不同热处理条件下富氧α层的形成。讨论合金中富氧α层的生成动力学和热力学。利用光学显微镜观察富氧α层并测量其厚度。结果表明,加热温度和保温时间均影响钛合金中富氧α层的形成,且温度为主要因素。富氧α层的厚度生长动力学曲线呈抛物线型,受氧扩散控制。计算出TA15和TA2钛合金富氧α层的生成激活能,分别为146.48 kJ/mol和59.97kJ/mol,说明TA2钛合金更易生成富氧α相。产生这种差异的主要原因是TA15的合金类型及合金元素的添加有助于阻止氧元素在α相中的扩散。建立TA15钛合金富氧层厚度-温度-时间的关系曲线。
The oxygen-rich α layers in TA2 and TA15 alloy after various heat treatments were studied. The forming thermodynamics and kinetics of oxygen-rich α layer were discussed. Optical microscope was used to observe α layer and measure its thickness. The re- sults show that both heat treatment temperatures and holding times control the forming of oxygen-rich α layer, and temperature is main factor. The kinetics curves of α layer controlled by oxygen diffusion show parabolic shape. The thermal activation energy calculated re- sults of α layer are 146.48 kJ/mol of TA15 alloy and 59.97kJ/mol for TA2 alloy. The alloy type and alloying elements, delaying diffu- sion of oxygen in the α phase, is the main reason of the difference between these two alloys. A three-dimensional curve of TA15 alloy was created to show the layer thickness under different conditions of exposure temperature and time.
出处
《航空材料学报》
EI
CAS
CSCD
北大核心
2014年第2期29-34,共6页
Journal of Aeronautical Materials
关键词
钛合金
富氧α层
动力学
生成激活能
titanium alloy
oxygen-rich α layer
kinetics
generation activation energy
