(1. 西安建筑科技大学 冶金科学与工程学院，西安 710055；
2. 西北有色金属研究院 钛合金研究所，西安 710016)
摘 要: 研究β和α+β 2种制度热处理后Ti-600合金在550~650 ℃和300 MPa时的高温蠕变行为。计算合金在不同应力、不同温度下的稳态蠕变速率及蠕变激活能，并在此基础上研究其蠕变强化机制。结果表明：当蠕变应力为300 MPa时，β处理和α+β处理的Ti-600合金的蠕变激活能Q分别为490.1 kJ/mol和473.5 kJ/mol，表明这2种制度处理的Ti-600合金的蠕变机制均主要表现为位错攀移机制；随着温度的升高，Ti-600合金在蠕变过程中位错的攀移速度加快，原子和空位移动加剧，因而出现稳态蠕变速率随着温度的升高而加快，而稳态蠕变的时间缩短的趋势。
关键字: Ti-600合金；高温钛合金；稳态蠕变速率；蠕变激活能；蠕变机制
two thermal treatments
（1. School of Metallurgical Science and Engineering, Xi’an University of Architecture and Technology,
Xi’an 710055, China;
2. Titanium Alloy Research Center, Northwest Institute for Nonferrous Metals Research, Xi’an 710016, China）
Abstract:After α and α+β heat treatments respectively, creep tests were made on Ti-600 alloy at the temperature varying from 550 ℃ to 650 ℃ and the stress of 300 MPa. Steady creep rate and activation energy Q were calculated for the alloy at different temperatures. Creep deformation mechanism was also investigated. The creep activation energies are 490.1 kJ/mol and 473.5 kJ/mol, respectively, for the alloy crept at the stress of 300 MPa after β and α+β thermal treatment, suggesting that dislocation climb is the rate-controlling mechanism at the testing region. As temperature increases, the dislocation climb and the movement rate for atoms and vacancies will increase abruptly for the alloy during the creep process, so the steady creep rate will increase with the increase of temperature, and the steady creep time tends to be shortened.
Key words: Ti-600 alloy; high temperature Ti alloys; steady creep rate; creep activation energy; deformation mechanism
