稀土Y对Ti_(50)Ni_(50)形状记忆合金700℃下恒温氧化行为的影响（英文）  

Effect of Y Addition on Isothermal Oxidation Behavior of Ti_(50)Ni_(50) Shape Memory Alloy at 700°C

作　　者：徐家文[1] 刘爱莲[1] 王淑花[1] 周月波[1] 张鹤[1] 周长海[1] 蔡伟[2] 

机构地区：[1]黑龙江科技大学,黑龙江哈尔滨150022 [2]哈尔滨工业大学,黑龙江哈尔滨150001

出　　处：《稀有金属材料与工程》2016年第9期2246-2252,共7页Rare Metal Materials and Engineering

基　　金：National Natural Science Foundation of China(51201062,51371078,51501058)

摘　　要：研究了添加稀土元素Y对等原子比Ti-Ni形状记忆合金显微组织和700℃恒温氧化行为的影响。结果表明,随Y的加入Ti-Ni合金的晶粒得到明显细化。当Y含量为0.5at%和1.0at%时,Y的加入显著降低了Ti-Ni合金的氧化速率,这是由于少量的Y抑制了Ti元素向外层的迅速扩散。然而当Y含量为5.0at%时,含Y的Ti-Ni合金的氧化速率增大,原因是沿NiY相形成的氧化物破坏了TiO_2氧化膜的连续性。The effect of Y addition on the microstructure and isothermal oxidation behaviour of an equal-atomic Ti-Ni shape memory alloy at 700 ℃ in air was investigated. The results show that the grains of the Ti-Ni alloy are evidently refined with Y addition. The oxidation rate significantly declines with the addition of 0.5 at%Y and 1.0 at%Y because the fast outward diffusion of Ti is inhibited by the segregated Y ions. However, the oxidation rate increases with 5.0 at%Y addition since the formation of oxide along the Ni Y phase breaks the continuity of the TiO2 scale.

关 键 词：TI-NI形状记忆合金 稀土Y 恒温氧化 显微组织 

分 类 号：TG139.6[一般工业技术—材料科学与工程]