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通过同步测量约束加热和冷却过程中合金的电阻率和回复应力与温度的关系,对Fe-Mn-Si-Cr-Ni形状记忆合金约束下的转变过程进行了详细研究,结果表明,变形约束加热后的冷却过程中,回复应力随温度降低而增加,当回复应力增加到大于合金的屈服强度时,将首先发生塑性变形;然后随温度的进一步降低,回复应力到达应力诱发ε马氏体相变的临界应力时,回复应力将诱发ε马氏体相变,导致回复应力随温度的降低而下降,塑性变形和应力诱发ε马氏体相变都将显著松弛回复应力,降低合金冷却到室温时的回复应力,建立了合金加热和冷却过程中回复应力的方程,提出了该记忆合金管接头成分设计原则。
The transformation process under the constraint of Fe-Mn-Si-Cr-Ni shape memory alloy was studied in detail by measuring the resistivity and the recovery stress of the alloy during the heating and cooling process, and the results show that the deformation and heating After the cooling process, the recovery stress increases with decreasing temperature. When the recovery stress increases beyond the yield strength of the alloy, the plastic deformation will occur first; then with the further decrease of temperature, the recovery stress reaches the stress-induced ε martensite transformation Of the critical stress, the recovery stress will induce ε martensitic transformation, resulting in the recovery stress decreases with decreasing temperature, plastic deformation and stress induced ε martensitic transformation will significantly relax the stress recovery, reducing the alloy cooling to room temperature The stress of the alloy during heating and cooling is established, and the principle of design of the memory alloy pipe joint is proposed.