Abstract
Existing experimental results have shown that four types of physical mechanisms, namely, martensite transformation, martensite reorientation, magnetic domain wall motion and magnetization vector rotation, can be activated during the magneto-mechanical deformation of NiMnGa ferromagnetic shape memory alloy (FSMA) single crystals. In this work, based on irreversible thermodynamics, a three-dimensional (3D) single crystal constitutive model is constructed by considering the aforementioned four mechanisms simultaneously. Three types of internal variables, i.e., the volume fraction of each martensite variant, the volume fraction of magnetic domain in each variant and the deviation angle between the magnetization vector, and easy axis are introduced to characterize the magneto-mechanical state of the single crystals. The thermodynamic driving force of each mechanism and the thermodynamic constraints on the constitutive model are obtained from Clausius’s dissipative inequality and constructed Gibbs free energy. Then, thermodynamically consistent kinetic equations for the four mechanisms are proposed, respectively. Finally, the ability of the proposed model to describe the magneto-mechanical deformation of NiMnGa FSMA single crystals is verified by comparing the predictions with corresponding experimental results. It is shown that the proposed model can quantitatively capture the main experimental phenomena. Further, the proposed model is used to predict the deformations of the single crystals under the non-proportional mechanical loading conditions.
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Abbreviations
- \( c_{\text{A}} \) :
-
Specific heat at a constant volume in austenite phase
- \( c_{\text{M}} \) :
-
Specific heat at a constant volume in martensite phase
- \( \bar{c} \) :
-
Effective specific heat
- \( {\varvec{e}}_{1} ,\,{\varvec{e}}_{2} ,{\varvec{e}}_{3} \, \) :
-
Three basis vectors of local coordinate system
- \( f^{\zeta } \) :
-
Resistance function of magnetic domain wall motion
- \( f^{\xi } \) :
-
Transformation and reorientation hardening function
- \( G \) :
-
Gibbs free energy
- \( G_{\alpha }^{\text{M}} \) :
-
Gibbs free energy of the α-th martensite variant
- \( G_{\text{mech}}^{{{\text{M}}\alpha }} \) :
-
Mechanical part of \( G_{\alpha }^{\text{M}} \)
- \( G_{\text{th}}^{{{\text{M}}\alpha }} \) :
-
Thermal part of \( G_{\alpha }^{\text{M}} \)
- \( G_{\text{mag}}^{{{\text{M}}\alpha }} \) :
-
Magnetic part of \( G_{\alpha }^{M} \)
- \( G_{{}}^{\text{A}} \) :
-
Gibbs free energy of austenite phase
- \( G_{\text{mech}}^{\text{A}} \) :
-
Mechanical part of \( G_{{}}^{\text{A}} \)
- \( G_{\text{th}}^{\text{A}} \) :
-
Thermal part of \( G_{{}}^{\text{A}} \)
- \( G_{\text{mag}}^{\text{A}} \) :
-
Magnetic part of \( G_{{}}^{\text{A}} \)
- \( {\varvec{H}} \) :
-
Magnetic field
- \( H^{\text{tr}} \) :
-
Transformation hardening modulus
- \( H^{\text{reo}} \) :
-
Reorientation hardening modulus
- \( H^{\text{cri}} \) :
-
Critical field at which magnetic saturation is achieved through domain wall motion
- \( {\varvec{I}} \) :
-
Fourth-ordered unit tensor
- \( K \) :
-
Initial reorientation resistance
- \( K_{I} \) :
-
Magneto-crystalline anisotropic constant
- \( {\varvec{k}} \) :
-
Second-ordered thermal conductivity tensor
- \( k_{{}}^{\alpha ij} \) :
-
Incidence matrix
- \( {\varvec{M}} \) :
-
Magnetization vector
- \( {\varvec{M}}_{M}^{\alpha } \) :
-
Magnetization vector of the α-th martensite variant
- \( M_{\text{sat}}^{\text{M}} \) :
-
Saturated magnetization of martensite phase
- \( {\varvec{M}}_{\text{A}}^{{}} \) :
-
Magnetization vector of austenite phase
- \( M_{\text{sat}}^{\text{A}} \) :
-
Saturated magnetization of austenite phase
- \( {\varvec{m}}_{\alpha 1} , {\varvec{m}}_{\alpha 2} \) :
-
Magnetization vectors of magnetic domains in the α-th martensite variant
- \( {\varvec{S}}_{\text{M}}^{\alpha } \) :
-
Elastic compliance of the α-th martensite variant
- \( {\varvec{S}}_{\text{A}}^{{}} \) :
-
Elastic compliance of austenite phase
- \( {\bar{\varvec{S}}} \) :
-
Effective elastic compliance
- \( T \) :
-
Temperature
- \( T_{0} \) :
-
Balance temperature
- \( u_{\text{A}}^{0} \) :
-
Internal energy at the referential state in austenite phase
- \( u_{\text{M}}^{0} \) :
-
Internal energy at the referential state in martensite phase
- \( Y \) :
-
Initial transformation resistance
- \( \varGamma_{\text{int}}^{{}} \) :
-
Intrinsic dissipation
- \( \varGamma_{\text{flux}}^{{}} \) :
-
Heat flux dissipation
- \( \varGamma_{\text{tr}}^{\alpha } \) :
-
Energy dissipation caused by transformation
- \( \varGamma_{\text{reo}}^{ij} \) :
-
Energy dissipation caused by reorientation
- \( {\varvec{\delta}} \) :
-
Second-ordered unit tensor
- \( {\varvec{\varepsilon}} \) :
-
Total strain
- \( {\varvec{\varepsilon}}^{e} \) :
-
Elastic strain
- \( {\varvec{\varepsilon}}^{\text{in}} \) :
-
Inelastic strain
- \( {\varvec{\varepsilon}}^{\text{tr}} \) :
-
Transformation strain
- \( {\varvec{\varepsilon}}^{\text{reo}} \) :
-
Reorientation strain
- \( {\varvec{\varepsilon}}_{\alpha }^{*} \) :
-
Eigenstrain of the α-th martensite variant
- \( \zeta_{\alpha } , 1 - \zeta_{\alpha } \) :
-
Volume fractions of magnetic domains in the α-th martensite variant
- \( \eta \) :
-
Entropy
- \( \eta_{\text{A}}^{0} \) :
-
Specific entropy in austenite phase
- \( \eta_{\text{M}}^{0} \) :
-
Specific entropy in martensite phase
- \( \Delta \eta_{{}}^{0} \) :
-
Difference of the specific entropy between martensite and austenite phases
- \( \theta_{\alpha i} ,\,\varphi_{\alpha i} \) :
-
Deviation angles of magnetization vectors
- \( \lambda_{ij} \) :
-
Transition amount from the j-th to i-th martensite variant
- \( \mu_{0} \) :
-
Vacuum permeability
- \( \pi_{\alpha }^{\text{tr}} \) :
-
Thermodynamic driving force of martensite transformation
- \( \pi_{ij}^{\text{reo}} \) :
-
Thermodynamic driving force of martensite reorientation
- \( \pi_{\alpha }^{\text{wall}} \) :
-
Thermodynamic driving force of domain wall motion
- \( \pi_{\alpha \beta }^{\theta } , \pi_{\alpha \beta }^{\theta } \) :
-
Thermodynamic driving force of magnetization vector rotation
- \( \xi_{\alpha } \) :
-
Volume fraction of the α-th martensite variant
- \( \xi_{\alpha }^{\text{tr}} \) :
-
Volume fraction of the α-th martensite variant related to martensite transformation
- \( \xi_{\alpha }^{\text{reo}} \) :
-
Volume fraction of the α-th martensite variant related to martensite reorientation
- \( \rho \) :
-
Density
- \( {\varvec{\sigma}} \) :
-
Stress
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (Grant 11602203), Young Elite Scientist Sponsorship Program by the China Association for Science and Technology (Grant 2016QNRC001), and Fundamental Research Funds for the Central Universities (Grant 2682018CX43).
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Yu, C., Kang, G., Song, D. et al. Three-dimensional constitutive model for magneto-mechanical deformation of NiMnGa ferromagnetic shape memory alloy single crystals. Acta Mech. Sin. 35, 563–588 (2019). https://doi.org/10.1007/s10409-018-0816-6
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DOI: https://doi.org/10.1007/s10409-018-0816-6