Remarkable Improvement of Shape-Memory Effect in a Co-31Ni-3Si Alloy by Ausforming

Sun, Jiacheng; Wang, Shanling; Zhou, Yan; Peng, Huabei; Wen, Yuhua

doi:10.1007/s11661-015-2761-3

Cited by 12 publications

(1 citation statement)

References 22 publications

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“…In contrast, the chemical driving force of FCC to HCP martensitic transformation increases with lowering the temperature. [22] When the temperature is below the T 0 temperature, the collective result is that the difference between the σ slip and the σ SIHM will become increasingly large with lowering the temperature. In other words, more deformation will be assumed by the stress-induced HCP martensite when the deformation temperature is much lower than the T 0 temperature, instead of the slip deformation.…”

Section: Introductionmentioning

confidence: 99%

Larger Recovery Strains in Cast Fe–Mn–Si‐Based Shape Memory Alloys by Reducing Thermal Activation and Optimizing Mn Content

Luo,

Fu,

et al. 2024

Adv Eng Mater

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Previous work showed that a maximal recovery strain of 8.4% after being bent at room temperature was realized in annealed cast polycrystalline Fe‐Mn‐Si‐based alloys because of the reduced annealing twin boundaries. Theoretically, higher recovery strains can be expected at cryogenic deformation by reducing thermal activation. To confirm this idea, martensitic transformation behaviors and the recovery strains after being bent at 77 K were investigated in the cast Fe‐(20‐26)Mn‐5.5Si‐8.5Cr‐5Ni alloys. We realized larger recovery strains as high as ∽10.0% in an annealed cast Fe‐23Mn‐5.5Si‐8.5Cr‐5Ni alloy after being bent at 77 K. The reduced thermal activation together with suppressed formation of thermal‐induced martensite by optimizing Mn content can account for the larger recovery strain. These results open up a new avenue for further enhancing the recovery strain in Fe‐Mn‐Si‐based shape memory alloys.This article is protected by copyright. All rights reserved.

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Section: Introductionmentioning

confidence: 99%

Larger Recovery Strains in Cast Fe–Mn–Si‐Based Shape Memory Alloys by Reducing Thermal Activation and Optimizing Mn Content

Luo,

Fu,

et al. 2024

Adv Eng Mater

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Key Factors Achieving Large Recovery Strains in Polycrystalline Fe–Mn–Si‐Based Shape Memory Alloys: A Review

et al. 2017

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Fe-Mn-Si-based shape memory alloys are the most favorable for largescale applications owing to low cost, good workability, good machinability, and good weldability. However, polycrystalline Fe-Mn-Si-based shape memory alloys have low recovery strains of only 2-3% after solution treatment, although monocrystalline ones reach a large recovery strain of %9%. This review gives an overview of the improvement of recovery strains for polycrystalline Fe-Mn-Si-based shape memory alloys. It is proposed that two fundamental aspects, that is, composition design and microstructure design, shall be satisfied for obtaining large recovery strains of above 6%. Alloying compositions determining the ceiling of recovery strains shall follow three guidelines: (i) Si content is 5-6 wt%; (ii) 20 wt% Mn 32 wt%; (iii) addition of elements strongly strengthening austenite matrix. Microstructure design includes coarsening austenitic grains and reducing twin boundaries as far as possible together with introducing a high density of stacking faults and second phases of strengthening austenite.

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Effect of W Contents on Martensitic Transformation and Shape Memory Effect in Co-Al-W Alloys

Yang

Qian

Peng

et al. 2018

Metall Mater Trans A

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Remarkable Improvement of Shape-Memory Effect in a Co-31Ni-3Si Alloy by Ausforming

Cited by 12 publications

References 22 publications

Larger Recovery Strains in Cast Fe–Mn–Si‐Based Shape Memory Alloys by Reducing Thermal Activation and Optimizing Mn Content

Larger Recovery Strains in Cast Fe–Mn–Si‐Based Shape Memory Alloys by Reducing Thermal Activation and Optimizing Mn Content

Key Factors Achieving Large Recovery Strains in Polycrystalline Fe–Mn–Si‐Based Shape Memory Alloys: A Review

Effect of W Contents on Martensitic Transformation and Shape Memory Effect in Co-Al-W Alloys

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