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

Peng, Huabei; Chen, Jie; Wang, Yongning; Wen, Yuhua

doi:10.1002/adem.201700741

Cited by 40 publications

(22 citation statements)

References 221 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…NiTi alloys are excellent SMAs. They can recover large strains of 6–8% due to the shape memory effect and superelasticity [ 1 , 2 ]. However, they exhibit low cold workability and high cost, limiting their large-scale applications [ 1 , 3 ].…”

Section: Introductionmentioning

confidence: 99%

Improving the Shape Memory Effect of a Fe-Mn-Si-Cr-Ni Alloy through Shot Peening

et al. 2022

View full text Add to dashboard Cite

To improve the shape memory effect, the solutionized Fe-24Mn-6Si-9Cr-6Ni alloy was shot peened and subsequently annealed. The phase constituent was examined using the X-ray diffraction method. Microstructure evolution was characterized using an optical microscope and the electronic backscatter diffraction method, and the shape memory effect was evaluated using a bending test. The results show that α′-martensite and ε-martensite were introduced into the shot-peened surface layer. The α′-martensite remained after annealing even at 850 °C. Microstructure of the surface layer was refined through shot peening and subsequent annealing. Compared with those of the solutionized specimen, the shape recovery ratio and recovery strain of the specimens that are shot peened and subsequently annealed are significantly improved at different prestrains.

show abstract

Section: Introductionmentioning

confidence: 99%

Improving the Shape Memory Effect of a Fe-Mn-Si-Cr-Ni Alloy through Shot Peening

et al. 2022

View full text Add to dashboard Cite

show abstract

“…Shape memory alloys (SMAs) have attracted much attention as a class of novel smart alloys owing to their shape memory effect and superelasticity [1]. Among a large number of SMAs [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16], Fe-based SMAs are expected to replace Ni-Ti SMAs for large-scale industrial applications due to their low cost and high workability [17][18][19]. In particular, Fe-Mn-Al-Nibased SMAs have temperature-insensitive superelastic stress and exhibit superelasticity over a wide temperature range [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Effect of Mo Alloying on the Precipitation Behavior of B2 Nano-Particles in Fe-Mn-Al-Ni Shape Memory Alloys

Yong

Zuo

Sun

et al. 2022

Metals

Self Cite

View full text Add to dashboard Cite

In Fe-Mn-Al-Ni shape memory alloys, the stabilization of superelasticity would be affected by the undesired precipitation of B2 nano-particles during natural aging. In order to solve this problem, the effect of Mo alloying on the precipitation behavior of B2 nano-particles during the cooling and natural aging processes was performed by scanning electron microscope, transmission electron microscope and Vickers microhardness test in two Fe-Mn-Al-Ni-Mo shape memory alloys. The results showed that the formation of γ phase was completely suppressed after 15 °C and 80 °C water quenching as well as air cooling. However, B2 nano-particles were still precipitated after the three cooling processes, and their sizes and misfits increased with decreasing the cooling rates. In addition, the Vickers hardness increased after natural aging for 338 days, which indicated that it is not viable to inhibit the precipitation of B2 nano-particles during natural aging by Mo alloying in the Fe-Mn-Al-Ni shape memory alloys.

show abstract

“…One of the main drawbacks of FeMnSi-based SMAs was their recoverable strains limited to 5%, even after the application of suitable "training" thermomechanical processing (Stanford et al, 2008) and various attempts, the mentioning of which is beyond the purpose of this paper, were done in order to increase these values. A series of successful results were remarkably obtained through suppressing the formation of the twin boundaries (Wen et al, 2014), associated with austenitic grain coarsening (Peng et al, 2017), which enabled "giant" tensile recoverable strains (Peng et al, 2018) of the order of 7.6-7.7%.…”

Section: Introductionmentioning

confidence: 99%

Powder Metallurgy: An Alternative for FeMnSiCrNi Shape Memory Alloys Processing

et al. 2020

View full text Add to dashboard Cite

In the case of quintenary Fe-Mn-Si-Cr-Ni shape memory alloys (SMAs), ingot metallurgy (IM) has technological shortcomings concerning compositional segregation, imperfect melt-incorporation of Si, demanganization during heating and cooling-induced cracking, which can be effectively surmounted by combining powder metallurgy (PM) with mechanical alloying (MA). The paper reviews the results reported in the processing and characterization of PM-MA'ed FeMnSiCrNi SMAs, with special emphasis on the findings obtained by present authors in the last decade. Specimens with nominal chemical compositions Fe-18Mn-3Si-7Cr-4Ni and Fe-14Mn-6Si-9Cr-5Ni (mass %) were produced by IM and PM. In the latter case various volume fractions of as-blended powders were MA'ed under protective atmosphere, before being pressed and sintered. Further compacting, up to 5% porosity degrees, was achieved by hot rolling. Structural analysis, performed by X-ray diffraction and scanning electron microscopy, revealed the formation of unusually large amounts of α-body centred cubic (bcc) thermally induced martensite. This undesirable martensite seemed to be destabilized by tensile pre-straining, and enabled PM specimens to reach higher stresses than IM ones. The formation and accumulation of α-bcc stress induced martensite was enhanced by tensile pre-straining, mechanical cycling and augmentation of MA'ed powder fraction. It has been argued that the optimization of technological processing parameters of heat treatment (HT) and hot rolling (HR) combined with MA'ed powder fraction caused the augmentation of shape memory effect (SME) magnitude. DMA-temperature scans revealed an increasing tendency of internal friction (tan δ) with MA'ed powder fraction, as well as the presence of two tan δ maxima ascribed to antiferromagneticparamagnetic transition and martensite reversion to austenite, respectively. DMA-strain sweeps emphasized the occurrence of a plateau on the storage modulus vs. strain amplitude variation which was associated with stress-induced formation of ε hexagonal close-packed (hcp)-martensite. In spite of large α-bcc amounts, PM-MA'ed Fe-14Mn-6Si-9Cr-5Ni experienced free-recovery SME which was enhanced by thermomechanical training. Coupling rings, meant to connect vibrating pipes that transport turbulent fluids, being able to mitigate vibrations that could accidentally open the connection, were manufactured and tested.

show abstract

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

Cited by 40 publications

References 221 publications

Improving the Shape Memory Effect of a Fe-Mn-Si-Cr-Ni Alloy through Shot Peening

Improving the Shape Memory Effect of a Fe-Mn-Si-Cr-Ni Alloy through Shot Peening

Effect of Mo Alloying on the Precipitation Behavior of B2 Nano-Particles in Fe-Mn-Al-Ni Shape Memory Alloys

Powder Metallurgy: An Alternative for FeMnSiCrNi Shape Memory Alloys Processing

Contact Info

Product

Resources

About