(中国科学院金属研究所，沈阳 110016)
摘 要: 对不同Ta含量的Ti-60A合金在700、750和800 ℃时的高温氧化行为进行测试，并运用X射线、扫描电镜等对Ta的作用进行分析和讨论。结果表明：Ta的加入显著改善合金的高温抗氧化性能，主要表现为Ta促使合金表层氧化物更致密细小，减小氧化膜的厚度，增加氧化膜与基体界面的粘附性，提高表面的稳定性；随Ta含量的增加，Ti-60A合金的氧化速率逐渐降低；Ti-60A合金的氧化动力学服从线性规律，在700和750 ℃氧化时，氧化近似为抛物线型规律；在800 ℃时，氧化近似服从直线规律。
关键字: Ti-60A钛合金；Ta 合金化；高温氧化
Ti-60A titanium alloys
（Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China）
Abstract:The effects of alloying element Ta on high temperature oxidation resistance of near-alpha high temperature titanium alloy Ti-60A were investigated. The high temperature oxidation behaviors of Ti-60A alloy with different Ta contents were tested by X-ray diffractometry (XRD) and scanning electron microscopy (SEM). The results show that the addition of Ta can improve the oxidation resistance of the alloy. The improvement of oxidation resistance by Ta is mainly attributed to promote the formation of homogeneous and fine oxidation products on the surface, increase the adhesion between the oxide scale and the matrix alloys, and improve the surface stability of alloys. The oxidation kinetics of the alloys can be described as a parabolic law at 700 and 750 ℃ and a linear law at 800 ℃. In addition, the more the Ta content of the alloy is, the lower the oxidation rate is.
Key words: Ti-60A titanium alloys; Ta alloying; high temperature oxidation
