Martensite structure in Ti–Ni–Hf–Cu quaternary alloy ribbons containing (Ti,Hf)2Ni precipitates
Martensite structure in Ti–Ni–Hf–Cu quaternary alloy ribbons containing (Ti,Hf)2Ni precipitates
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DOI：
10.1016/j.actamat.2010.03.015
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发表时间：
2010-06
期刊：
影响因子：
9.4
通讯作者：
X. Meng;W. Cai;Y. Fu;Jianxin Zhang;L. C. Zhao
中科院分区：
文献类型：
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作者：
X. Meng;W. Cai;Y. Fu;Jianxin Zhang;L. C. Zhao
研究了Ti 36 Ni 44 Hf 15 Cu 5薄带在不同温度退火后的马氏体组织。当退火温度<873 K时，晶粒内部析出直径为20- 40 nm的球形（Ti，Hf）_2Ni颗粒。透射电镜分析表明，（Ti，Hf）2Ni析出相均匀分布的薄带中（001）孪晶占主导地位。当退火温度为773 K时，马氏体畴与（001）孪晶之间的边界模糊不清。当退火温度为873 K时，马氏体畴间存在四种类型的晶界：{111}、（001）//{111}、{113}和（110）//{113}型。当退火温度为973 K时，（011）孪晶占优势，马氏体变体主要为矛状和镶嵌状。但在粗大的（Ti，Hf）2Ni析出相周围也存在含有（001）孪晶的马氏体畴。细小的（Ti，Hf）_2Ni相是提高Ti-Ni-Hf-Cu薄带形状记忆效应和超弹性的主要原因。
The martensite structure in a Ti36Ni44Hf15Cu5ribbon annealed at different temperatures is investigated. When the annealing temperature is <873K, spherical (Ti,Hf)2Ni particles 20–40nm in diameter precipitate in the grain interior. Transmission electron microscopy analysis shows that (001) compound twins are dominant in the ribbon containing homogeneously distributed (Ti,Hf)2Ni precipitates. When the annealing temperature is 773K, the boundaries between the martensite domains with the (001) twins are blurry and vague. When the annealing temperature is 873K, four types of boundaries among the martensite domains are found: {111}, (001)//{111}, {113} and (110)//{113} types. When the annealing temperature is 973K, the (011) twins become dominant, and the martensite variants show mainly spear-like and mosaic-like morphologies. However, martensite domains with (001) twins also exist around the coarse (Ti,Hf)2Ni precipitates. Fine (Ti,Hf)2Ni precipitates should be responsible for the improvement in shape memory effect and the superelasticity of Ti–Ni–Hf–Cu ribbons.