Ti-600合金的高温蠕变行为  

Creep behavior of Ti-600 alloy at elevated temperature

作　　者：曾立英[1,2] 杨冠军[1] 洪权[2] 赵永庆[2] 

机构地区：[1]西安建筑科技大学冶金工程学院,陕西西安710055 [2]西北有色金属研究院,西安710016

出　　处：《材料热处理学报》2011年第2期81-85,共5页Transactions of Materials and Heat Treatment

基　　金：国家"973"计划资助项目(2007CB613807);国家科技支撑计划资助项目(2007BAE07B01)

摘　　要：研究了Ti-600合金在550～650℃下的高温蠕变行为,实验应力为150～300 MPa。计算了合金在不同应力、不同温度下的稳态蠕变速率、应力指数及蠕变激活能,并在此基础上研究了其蠕变强化机制。蠕变应力为300 MPa时,Ti-600合金的蠕变激活能Q=490.1 kJ/mol;650℃,合金的蠕变应力指数n值在6.5～8.5之间变化,表明在实验温度范围内合金的蠕变变形以位错攀移为主,以位错的滑移为辅。Creep behavior of a near α tiatanium alloy Ti-600 at 550-650 ℃ and the stress from 150 MPa to 300 MPa was investigated.Steady creep rate,stress exponent n and activation energy Q were calculated for the alloy at different temperatures and various stresses,and creep deformation mechanism was also analysed.The results indicate that the creep activation energy is 490.1 kJ/mol for the alloy crept with stress of 300 MPa.The stress exponent varies from 6.5 to 8.5 for the samples tested at 650 ℃.At the testing temperature range,the rate-controlling mechanism for creep is dislocation climb,and the subordinated one is dislocation sliding.

关 键 词：Ti-600高温钛合金 应力指数 蠕变激活能 稳态蠕变速率 变形机制 

分 类 号：TG146.23[一般工业技术—材料科学与工程]