Phase transformation in superelastic NiTi polycrystalline micro-tubes under tension and torsion - from localization to homogeneous deformation

被引:207
作者
Sun, QP [1 ]
Li, ZQ [1 ]
机构
[1] Hong Kong Univ Sci & Technol, Dept Mech Engn, Kowloon, Hong Kong, Peoples R China
基金
中国国家自然科学基金;
关键词
phase transformation; NiTi shape memory alloy micro-tubes; tension/torsion test; material instability; thickness of A-M interface;
D O I
10.1016/S0020-7683(02)00182-8
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
Recent tension-torsion test results on nano-grained NiTi shape memory alloy micro-tubes are reported in this paper. It is discovered that: (1) during uniaxial tensile loading, the stress-induced transformation in the micro-tubes is realized by the initiation and growth of a macroscopic spiral martensite band with a quite sharp austenite-martensite (A-M) interface; (2) during loading by torsion (pure shear), the stress-strain curve exhibits monotonic hardening, the stress-induced transformation is axially homogeneous throughout the whole tube and the transformation strain is much smaller than that under tension; (3) under tension-torsion combined loading with an increasing shear/tension stress ratio, there is a gradual change in the deformation mode from localization and propagation (under pure tension) to the homogeneous deformation (under pure shear). The tube surface morphology observation indicates that, during this gradual change, the A-M interface thickness increases as its evolution is recorded. The test results demonstrate that there is a strong anisotropy and loading path dependence of the tube responses in both kinematics and kinetics. Possible underlying physical mechanisms are analyzed and implications for future theoretical modelling are also discussed. (C) 2002 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:3797 / 3809
页数:13
相关论文
共 25 条
  • [1] ON THE DRIVING TRACTION ACTING ON A SURFACE OF STRAIN DISCONTINUITY IN A CONTINUUM
    ABEYARATNE, R
    KNOWLES, JK
    [J]. JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS, 1990, 38 (03) : 345 - 360
  • [2] A CONTINUUM MODEL OF A THERMOELASTIC SOLID CAPABLE OF UNDERGOING PHASE-TRANSITIONS
    ABEYARATNE, R
    KNOWLES, JK
    [J]. JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS, 1993, 41 (03) : 541 - 571
  • [3] DUERIG TW, 1995, MATER RES SOC SYMP P, V360, P497
  • [4] The role of texture in tension-compression asymmetry in polycrystalline NiTi
    Gall, K
    Sehitoglu, H
    [J]. INTERNATIONAL JOURNAL OF PLASTICITY, 1999, 15 (01) : 69 - 92
  • [5] LI ZQ, 2002, IN PRESS INT J PLAST
  • [6] LI ZQ, 2002, THESIS HONG KONG U S
  • [7] Mechanical behavior of an Ni-Ti shape memory alloy under axial-torsional proportional and nonproportional loading
    Lim, TJ
    McDowell, DL
    [J]. JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY-TRANSACTIONS OF THE ASME, 1999, 121 (01): : 9 - 18
  • [8] Effect of texture orientation on the martensite deformation of NiTi shape memory alloy sheet
    Liu, Y
    Xie, ZL
    Van Humbeeck, J
    Delaey, L
    [J]. ACTA MATERIALIA, 1999, 47 (02) : 645 - 660
  • [9] Texture of Ti-Ni rolled thin plates and sputter-deposited thin films
    Miyazaki, S
    No, VH
    Kitamura, K
    Khantachawana, A
    Hosoda, H
    [J]. INTERNATIONAL JOURNAL OF PLASTICITY, 2000, 16 (10-11) : 1135 - 1154
  • [10] Stress-induced martensitic transformation of a NiTi alloy in isothermal shear, tension and compression
    Orgeas, L
    Favier, D
    [J]. ACTA MATERIALIA, 1998, 46 (15) : 5579 - 5591