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Phase-field simulations of partial pseudoelastic stress-strain behavior and microstructure evolution of Ni-Mn-Ga

机译：Ni-Mn-Ga的局部拟弹性应力应变行为和组织演变的相场模拟

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摘要

The partial pseudoelastic stress-strain behavior and the underlying microstructure evolution of Ni-Mn-Ga ferromagnetic shape memory alloy under different values of constant (assisted) magnetic field H and demagnetization factor N are studied by phase-field simulations. The results show that both H and N_(field) (component of N parallel to H) have significant influence on the partial strain recovery in the com-pressive stress loading-unloading cycle, while N_(stress) (component of N parallel to the stress) only affects the formation of magnetic domains in the stress-preferred variant and has no influence on the strain recovery behavior. The recovered strain can be increased by raising H or reducing N_(field). Moreover, the range of H for the partial strain recovery increases with N_(field). It is shown that Ni-Mn-Ga exhibits the partial pseudoelasticity at moderate/high H under a large N_(field) rather than just at low H as observed in existing experiments, demonstrating the significant influence of N_(field) on the strain recovery behavior. The work reveals that both H and N_(field) affect the strain recovery behavior through the effective magnetic field ~·H_(field) (component of the internal magnetic field parallel to H) during the stress cycle. ~·H_(field) decreases with the twin boundary motion during the reverse martensite reorientation and eventually becomes insufficient to trigger the twin boundary motion, which is responsible for the partial strain recovery.
机译：通过相场模拟研究了Ni-Mn-Ga铁磁形状记忆合金在恒定（辅助）磁场H和退磁因子N不同值下的局部拟弹性应力-应变行为及其潜在的微观组织演变。结果表明，H和N_（场）（N的分量平行于H）对压缩应力加载-卸载循环中的局部应变恢复有显着影响，而N_（应力）（N的分量与H平行。应力）仅影响应力优先变形中磁畴的形成，而对应变恢复行为没有影响。可以通过提高H或减小N_（field）来增加恢复的应变。而且，用于局部应变恢复的H的范围随着N_（场）而增大。结果表明，Ni-Mn-Ga在大的N_（场）下在中等/高H下表现出部分拟弹性，而不是像现有实验中那样仅在低H下表现出部分拟弹性，证明了N_（场）对应变恢复的显着影响。行为。这项工作表明，在应力循环过程中，H和N_（field）都通过有效磁场〜·H_（field）（与H平行的内部磁场的分量）影响应变恢复行为。在逆马氏体重新定向过程中，〜H_（field）随着孪晶边界运动而减小，并最终变得不足以触发孪晶边界运动，这是导致部分应变恢复的原因。

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