Orientation and composition dependencies of shape memory effect IN Fe-Mn-Si alloys

Sato, Akira; Chishima, E; Yamaji, Youhei; Mori, T.

doi:10.1016/0001-6160(84)90065-8

Cited by 290 publications

(132 citation statements)

References 13 publications

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“…04002-p. 3 The above observations were confirmed by XRD results. Most of the solution treated specimens revealed marked amounts of α'-bcc martensite in initial state, before pre-straining.…”

Section: Esomat 2015supporting

confidence: 69%

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Factors influencing martensite transitions in Fe-based shape memory alloys

Mihalache

Pricop

Suru

et al. 2015

MATEC Web of Conferences

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Abstract. Fe-14Mn-6Si-9Cr-5Ni (mass %) shape memory alloy (SMA) specimens were obtained by powder metallurgy in as-blended state (0_MA) and with particle volume fractions of 10 and 20 % MA'd powders, respectively. After hot rolling and solution treatment, between 973 and 1373 K, the specimens were pre-strained up to 4 %, on a tensile testing machine. The influences of: (i) MA'd fractions, (ii) solution treatment temperature and (iii) pre-straining degree were analysed by X-ray diffraction (XRD), optical (OM) and scanning electron (SEM) microscopy. In this purpose, the gauges of pre-strained specimens were cut and metallographically prepared. Dynamic mechanical analysis (DMA) was employed to emphasize the reverse transformation, during heating, of thermally induced martensite, obtained after solution treatment. The results proved that, as an effect of PM-MA processing, mechanical properties were improved, the amount of stress induced martensite increased and the reverse martensitic transformation was enhanced.

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Section: Esomat 2015supporting

confidence: 69%

“…After the first reports on Fe-Mn-Si Shape Memory Alloys (SMAs) single crystals, due to Sato et al, [1][2][3], Murakami et al succeeded to obtain Fe-(28-34) Mn-(4-6,5) Si (mass. %, as all chemical compositions will be listed hereinafter) polycrystalline alloys with almost perfect Shape Memory Effect (SME) [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Factors influencing martensite transitions in Fe-based shape memory alloys

Mihalache

Pricop

Suru

et al. 2015

MATEC Web of Conferences

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“…When the tensile pre-strain is o7%, the difference in the RS is very small among the samples prepared from three different directions with respect to the initial solidification direction. For single-crystalline Fe-Mn-Si steel 41,42 , however, the RS in specimens deformed along favourable and unfavourable orientations, namely, o4144 and o0014, shows a quite large difference by a factor of five.…”

Section: Discussionmentioning

confidence: 95%

Large recovery strain in Fe-Mn-Si-based shape memory steels obtained by engineering annealing twin boundaries

et al. 2014

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Shape memory alloys are a unique class of materials that can recover their original shape upon heating after a large deformation. Ti-Ni alloys with a large recovery strain are expensive, while low-cost conventional processed Fe-Mn-Si-based steels suffer from a low recovery strain (o3%). Here we show that the low recovery strain results from interactions between stress-induced martensite and a high density of annealing twin boundaries. Reducing the density of twin boundaries is thus a critical factor for obtaining a large recovery strain in these steels. By significantly suppressing the formation of twin boundaries, we attain a tensile recovery strain of 7.6% in an annealed cast polycrystalline Fe-20.2Mn-5.6Si-8.9Cr-5.0Ni steel (weight%). Further attractiveness of this material lies in its low-cost alloying components and simple synthesis-processing cycle consisting only of casting plus annealing. This enables these steels to be used at a large scale as structural materials with advanced functional properties.

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“…Since the discovery of shape memory effect (SME) in Fe-based alloys, the alloys have drawn great attention due to advantage of low cost and good mechanical properties over non-ferrous alloys [1,2]. The alloys, however, exhibit a poor SME for commercial application.…”

Section: Introductionmentioning

confidence: 99%

“…In single crystals, it has been reported SME differs as many as 20 times according to deformation direction in NiAl alloys [8]. Sato et al [2] also observed that an excellent SME is found when an Fe-Mn-Si single crystal is elongated along [441]y direction, because it is favorable for y (fee)->e (hep) transformation. Therefore an excellent SME can be obtained in single crystals by taking the specimen so that the deformation direction is parallel to the best SME direction.…”

Section: Introductionmentioning

confidence: 99%

Formation of texture and anisotropy of shape memory effect in Fe-Mn-Si-Co-Cr alloy

et al. 2001

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Abstract. This study is aimed at investigating the anisotropy of shape memory effect in Fe-based alloy. An Fe-15Mn-3Si-4Co-5Cr alloy is cold rolled by 92%, and annealed at 630 "C for 45min. The alloy undergoes y-»e -*a ' transformation by cold rolling and y is restored with a major preferred orientation of (110) y [001] y by the annealing. The specimens for shape memory effect and tensile test are taken 0, 45, 70, 80 and 90 degs to the rolling direction. The specimen taken along 70 degs to the rolling direction exhibits the best shape memory effect. An analysis of the (110)y [001]y texture reveals that the specimen experiences the deformation stress along [221]y which is the most expandable direction in the y->e transformation. In tensile test, the best SME specimen shows the lowest yield stress, indicating that the transformation take place most easily since the deformation is applied to the preferential direction to the transformation. key words; shape memory effect, texture, Fe-based alloy, martensitic transformation

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Orientation and composition dependencies of shape memory effect IN Fe-Mn-Si alloys

Cited by 290 publications

References 13 publications

Factors influencing martensite transitions in Fe-based shape memory alloys

Factors influencing martensite transitions in Fe-based shape memory alloys

Large recovery strain in Fe-Mn-Si-based shape memory steels obtained by engineering annealing twin boundaries

Formation of texture and anisotropy of shape memory effect in Fe-Mn-Si-Co-Cr alloy

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