长时间热退火对Ti-Ni-Cu合金条带马氏体相变行为的影响  

Effect of long-term annealing on the martensitic transformation behavior of Ti-Ni-Cu alloy ribbons

作　　者：何文军[1,2] 闵光辉[1] 奥列格.托罗辛科 

机构地区：[1]山东大学材料科学与工程学院,山东济南250061 [2]中国海洋大学材料科学与工程研究院,山东青岛266100 [3]圣彼得堡国立工业大学材料科学系,俄罗斯圣彼得堡195251

出　　处：《功能材料》2009年第10期1666-1669,共4页Journal of Functional Materials

基　　金：国家外专局聘请外国专家重点资助项目(20050360646)

摘　　要：采用快速凝固法制备了Ti53.5Ni22.8Cu23.7合金非晶薄带,研究了长时间热退火对合金条带马氏体相变行为的影响。结果表明,经450～500℃保温退火1～10h条带的相变热滞对保温时间不敏感,约为13～15℃,相变热在4～8J/g之间。随着保温时间延长,500℃退火下的条带相变峰值温度移向高温区而450℃退火下则移向低温区。条带在低于晶化温度的400℃保温10h后晶化程度显著提高,体现出明确的马氏体相变,其相变热滞为13.9℃。合金条带在400℃退火10h形成具有织构(001)的TiCu-B11析出物和Ti2Cu型析出物,在450～500℃退火形成Ti2Cu型析出物。长时间退火下的条带相变特征的差异与退火条带的织构、析出物类型及析出物改变合金基体相的化学成分有关。Ti53.5 Ni22.8 Cu23.7 shape memory alloy ribbons have been fabricated by rapid solidification and the effect of long-term annealing on their martensitic transformation behavior was investigated. The transformation hystereses with the values of about 13-15℃ are not sensitive to the holding time when the ribbon is annealed at 450 or 500℃ ,and their transformation heats are about 4-8J/g. With the holding time increasing, the transformation peak temperatures shift to higher temperature region for the ribbon annealed at 450℃ ,while those shift to lower temperature region when annealed temperature is 500℃. The ribbon with long-term annealed at 400℃ for 10h, which is lower than the crystallization temperature, can be greatly crystallized and exhibit well-defined transformation behavior with the transformation hysteresis of 13.9℃. TiCu-Bll precipitates with （001） preferential orientation and Ti2Cu precipitates can be formed in the ribbon annealed at 400℃ for 10h,while Ti2Cu precipitates are often formed at 450 and 500℃. The difference of the long-term annealing ribbon in the transformation behavior is ascribed to different textures, the type of precipitates and the chemical compositional evolution of matrix arising from the formation of precipitates.

关 键 词：快速凝固 Ti—Ni—Cu合金 马氏体相变 析出物 

分 类 号：TG146.2[一般工业技术—材料科学与工程]