Martensitic Transformations in Ti-Ni alloy Single Crystals

Ti-Ni合金单晶中的马氏体转变

• 批准号: 09044130
• 负责人: OTSUKA Kazuhiro
• 金额: $ 3.33万
• 依托单位: University of Tsukuba
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B).
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09044130/
• 关键词: martensitic transformation; single crystal; elastic constant; pre-transformation; R-phase transformation; Ti-Ni; lattice softening; phonon softening

We carried out joint research with Russia and Japan systematically on the martensitic transformations in Ti-Ni-based single crystals, and obtained the following results. (1) Three distinct types of martensitic transformations occur in Ti-Ni alloy systems depending upon composition. By measuring elastic constants of Ti-Ni, Ti-Ni-Cu and Ti-Ni-Fe systematically by parallelepiped resonance method, we obtained the following interesting results. Both elastic constants c' and cィイD244ィエD2 soften with decreasing temperature. The temperature dependence of elastic anisotropy A = cィイD244ィエD2/c' differs greatly, depending upon the types of transformations. Thus, it was found that there is a close relationship between the types of transformation and elastic anisotropy. Furthermore, the origin for the appearance of monoclinic martensite B19' was explained by the temperature dependence of cィイD244ィエD2 and A. (2) By neutron inelastic scattering measurement, phonon softening was found near the Brilloiun zone boundary of 1/2<110><11ィイD4-ィエD40> branch for B2-B19 (orthrombic) transformation in Ti-30Ni-20Cu alloy. (3) By in-situ electron microscopy observations of Ti-Ni-Fe alloy, the pre-martensitic behavior of B2-R phase transformation was clarified. (4) The structure of R-phase was determined accurately. (5) The orientation dependence of superelasticity in Ti-Ni alloy was clarified by tension and compression test.

我们与俄罗斯和日本对ti - ni基单晶中的马氏体相变进行了系统的联合研究，得到了以下结果：(1)根据成分的不同，Ti-Ni合金体系发生三种不同类型的马氏体相变。用平行六面体共振法系统地测量了Ti-Ni、Ti-Ni- cu和Ti-Ni- fe的弹性常数，得到了以下有趣的结果。随着温度的降低，弹性常数c′和c φ φ D244 φ φ D2均变软。弹性各向异性A = c φ φ D244 φ φ D2/c′的温度依赖性因相变类型的不同而有很大差异。由此发现，相变类型与弹性各向异性之间存在着密切的关系。(2)通过中子非弹性散射测量，在Ti-30Ni-20Cu合金中B2-B19（正晶）转变的1/2<110>< 11d4 - d40>分支布里仑区边界附近发现声子软化。(3)通过原位电镜观察，明确了Ti-Ni-Fe合金B2-R相变的预马氏体行为。(4)准确测定了r相的结构。(5)通过拉伸和压缩试验，阐明了Ti-Ni合金超弹性的取向依赖性。

项目成果

J.Zhang et al.: "Elastic Constants of Ti-48 at%Ni-2 at%Fe Single Crystal Prior to B2→R Transformation"Materials Transactions,JIM. 40,5. 385-388 (1999)

J.Zhang 等人：“B2→R 转变之前 Ti-48 at%Ni-2 at%Fe 单晶的弹性常数”Materials Transactions，JIM 40,5 (1999)。

Y.Murakami et al.: "Electronic Structure Changes Associated with a Martensitic Transformation in Ti_<50>Ni_<48>Fe_2 Alloy Studied by Electron Energy-loss Spectroscopy" Journal of Electron Microscopy. 47(4). 301-309 (1998)

Y.Murakami等人：“通过电子能量损失光谱研究的Ti_<50>Ni_<48>Fe_2合金中与马氏体相变相关的电子结构变化”电子显微镜杂志。

Ken Gall et al.: "The influence of aging on critical transformation stress level and martensite start temperatures in Ni-Ti:part 1,Aged microstructure and micro-mechanical modeling" Journal of Engineering and Technology-Special Edition on Shape Memory All

Ken Gall 等人：“时效对 Ni-Ti 中临界转变应力水平和马氏体起始温度的影响：第 1 部分，时效微观结构和微观机械建模”《工程与技术杂志》形状记忆特别版 All

Ken Gall et al.: "Pseudoelastic cyclic stress-strain response of over-aged single crystal Ti-50.8 at%Ni" Scripta Materilia. (in press).

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Youyi Chu et al.: "Proc.China-Japan Bilateral Symposium on Shape Memory Alloys" International Academic Publishers, 318 (1998)

褚友毅等：《Proc.中日形状记忆合金双边研讨会》国际学术出版社，318（1998）