Co50Ni22Ga28:Fex单晶在室温和100℃高温的超弹性研究

制备了四元铁磁性Heusler合金Co₅₀Ni₂₂Ga_{28：Fex（x＝0，1.5，2，2.5），发现材料具有很好的机械性能，在加压、 弯曲和扭曲时都展现出很好的超弹性.室温时，在压力作用下，Co50Ni22< /sub>Ga28：Fe2单晶样品在［001］和［110］方向分别具有约4%和 6.7%的完全可恢复应变.Co50Ni22Ga28：Fe1.5单晶样品在室温下沿［001］和［110］方向的应力与应变σ-ε曲线的平台部分较缓， 但升温到100℃时，σ-ε曲线中表示超弹性应变的平台变平.Co50Ni22Ga28 ：Fe2.5成分的单晶在［001］方向可得到5.5%的超弹性应 变.同时以上材料都显示出了明显的弹性各向异性. 关键词： 铁磁性Heusler合金 超弹性 50Ni22Ga28：Fex')" href="#">Co50Ni22Ga28：Fex}

Pseudoelasticity of Co50Ni22Ga28:Fex single crystal at room temperature and high temperature of 100℃

The pseudo-quaternary Heusler alloys Co₅₀Ni₂₂Ga_{28:Fex (x＝0,1.5,2,2.5) single crystals have been synthesized. Excell ent pseudoelasticities were observed in compression, bending and torsion. At roo m temperature, the perfect pseudoelastic strains of 4% and 6.7% were obtained in the ［100］ and ［110］ directions of the Co50Ni22Ga 28:Fe2 single crystal under compression, respectively. The stre ss-strain curve for the Co50Ni22Ga28:Fe1.5 single crystals shows an indistinct platform on loading, and an intermar tensitic transformation occurs with unloading. The platform of the curve on load ing becomes clear and the intermartensitic transformation with unloading becomes indistinct at the high temperature of 100℃. Pseudoelastic strains of 5.5% wer e obtained in the ［001］ direction of the Co50Ni22Ga 28 :Fe2.5 single crystal. In addition, the single crystals show strong elastic anisotropy.}