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原位中子衍射研究两相NiTi合金的微力学相互作用和相变机理

孙光爱 王虹 汪小琳 陈波 常丽丽 刘耀光 盛六四 Woo W Kang MY

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原位中子衍射研究两相NiTi合金的微力学相互作用和相变机理

孙光爱, 王虹, 汪小琳, 陈波, 常丽丽, 刘耀光, 盛六四, Woo W, Kang MY

Insitu neutron diffraction study of micromechanical interaction and phase transformation in dual phase NiTi alloy during tensile loading

Sun Guang-Ai, Wang Hong, Wang Xiao-Lin, Chen Bo, Chang Li-Li, Liu Yao-Guang, Sheng Liu-Si, Woo Wanchuck, Kang Mi-Hyun
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  • NiTi合金的形状记忆效应与其微观结构特征密切相关, 中子衍射技术可以在力学加载过程中原位观察块体NiTi合金的相变、 晶间应变以及孪晶再取向等演化特征. 结合两相NiTi合金宏观应力-应变曲线呈现的四种阶段性变形特征, 利用原位中子衍射技术对其变形过程中的微观结构演化进行了分析. 奥氏体初始体积份额约22%, 在低应变硬化阶段, 晶面(110)B2和(002)B19' 的应变分别突然减小和增大表明出现了应力诱发马氏体相变, 奥氏体体积份额迅速减小, 产生了 011 Ⅱ型孪晶; 同时初始马氏体也开始发生再取向, 随着应变量的增加, 开始出现新的{201}型马氏体孪晶, 这种孪晶引起的应变卸载时不能回复. 在高应变硬化阶段孪晶变形起主导作用, 衍射峰半高宽变化较小; 而在应变硬化饱和阶段则以滑移机制为主, 大量位错的产生使衍射峰半高宽显著增加.
    It is well known that the shape memory effect of NiTi alloy is closely related to the micro-structural characteristics. Neutron diffraction method can used to explore the changes of the phase transformation, lattice strain and twining reorientation of bulk NiTi alloy during deformation caused by the applied stress. In this paper, combining the four types of deformation characteristics in the macro stress-strain curves of dual phase NiTi alloy and using in-situ neutron diffraction measurement, the micromechanical interactions and phase transformation are determined. The volume fraction of the initial austenite before deformation is about 22%. The contrast transformation, which is corresponding to the lattice strain rapid decreasing of (110)B2 and increasing of (002)B19', reveals that the stress-induced transformation from austenite to martensite phase appears with the volume fraction of austenite decreasing rapidly and 011 II type twinning increases at the low strain hardening stage. At the same time, the initial martensite grains change their orientation to a favorable direction and the new {201} type martensite twinnings induced with the increase of applied stress cannot recover after unloading. At the high strain hardening stage, the twinning deformation is considered to be the main mechanism from the observing of the changes in the full width at half maximum (FWHM). Meanwhile, the slipping caused by dislocation is the main deformation mechanism corresponding to the obvious increas of the FWHM at the statured stage of the strain hardening.
    • 基金项目: 国家自然科学基金(批准号: 91126001, 11105128和51001024), 中国工程物理研究院科学技术发展基金(批准号: 2010A0103002)和中国工程物理研究院核物理与化学研究所科学技术创新基金(批准号: 2009CX01)资助的课题.
    • Funds: Project supported by the National Natural Science Foundation of China (Grant Nos. 91126001, 11105128, 51001024), the Science and Technology Foundation of Chinese Academy of Engineering Physics (Grant No. 2010A0103002), and the Science and Technology Innovation Fund of Institute of Nuclear Physics and Chemistry of Chinese Academy of Engineering Physics (Grant No. 2009CX01).
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    Nishida M, Li S, Kitamura K, Furukawa T, Chiba A, Hara T 1998 Scripta Mater. 39 1749

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    Hatcher N, Kontsevoi O Y, Freeman A J 2009 Phys. Rev. B 79 020202

    [2]

    Allafi J K, Ren X, Eggeler G 2002 Acta Mater. 50 793

    [3]

    Fan G, Chen W, Yeng S, Zhu J, Ren X, Otsuka K 2004 Acta Mater. 52 4351

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    Krishman M, Singh J B 2000 Acta Mater. 48 1325

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    Bhattacharya K, Conti K S, Zanzotto G, Zimmer J 2004 Nature 428 55

    [6]

    Liu Y, Xie Z L 2003 Acta Mater. 51 5529

    [7]

    Kulkov S N, Mironov Y P 1995 Nucl. Instr. Meth. Phys. Res. A 359 165

    [8]

    Sitepu H, Schmahl W W, Allafi J K, Eggeler G, Dlouhy A, Toebbens D M, Tovar M 2002 Scripta Mater. 46 543

    [9]

    Allafi J K, Schmahl W W, Wagner M, Sitepu H, Toebbens D M, Eggeler G 2004 Mater. Sci. Eng. A 378 161

    [10]

    Allafi J K, Schmahl W W, Toebbens D M 2006 Acta Mater. 54 3171

    [11]

    Allafi J K, Eggeler G, Schmahl W W, Sheptyakov D 2006 Mater. Sci. Eng. A 438-440 593

    [12]

    Young M L, Wagner M F X, Frenzel J, Schmahl W W, Eggeler G 2010 Acta Mater. 58 2344

    [13]

    Simon T, Kroger A, Somsen C, Dlouhy A, Eggeler G 2010 Acta Mater. 58 1850

    [14]

    Bhattacharya K, Kohn R V 1996 Acta Mater. 44 529

    [15]

    Gall K, Lim T J, Mcdowell D L, Sehitoglu H, Chumlyakov Y I 2000 Inter J. Plast. 16 1189

    [16]

    Bourke M A M, Vaidyanathan R, Dunand D C 1996 Appl. Phys. Lett. 69 21

    [17]

    Vaidyanathan R, Bourke M A M, Dunand D C 1999 J. Appl. Phys. 86 3020

    [18]

    Rathod C R, Clausen B, Bourke M A M, Vaidyanathan R 2006 Appl. Phys. Lett. 88 201919

    [19]

    Knowles K M, Smith D A 1981 Acta Metall. 29 101

    [20]

    Ren X, Otsuka K 1998 Scripta Mater. 38 1669

    [21]

    Liu Y, Liu Y, Van H J 1998 Scripta Mater. 39 1047

    [22]

    Miyazaki S, Otsuka K, Suzuki Y 1981 Scripta Metall. 15 287

    [23]

    Otsuka K, Ren X 2005 Pro. Mater. Sci. 50 511

    [24]

    Shaw J A, Kyriakides S 1997 Acta Mater. 45 683

    [25]

    Nishida M, Li S, Kitamura K, Furukawa T, Chiba A, Hara T 1998 Scripta Mater. 39 1749

    [26]

    Goo E, Duerig T, Melton K, Sinclair R 1985 Acta Metal. 33 1725

    [27]

    Li S, Yamauchi K, Maruhashi Y, Nishida M 2003 Scripta Mater. 49 723

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出版历程
  • 收稿日期:  2012-04-13
  • 修回日期:  2012-06-18
  • 刊出日期:  2012-11-05

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