The Martensitic Structure and Shape Memory Effect in NiMn Alloyed by Ti and Al

Potapov, Pavel; Polyakova, N. A.; Udovenko, V. A.; Svistunova, E. L.

doi:10.1515/ijmr-1996-870105

Cited by 3 publications

(6 citation statements)

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“…Although Adachi and Wayman 231 concluded that Ti, Al, Cu or B additions did not improve ductility, results from later studies contradicted this finding. Instead, Potapov et al 233 reported that elongation to failure in compression at room temperature increased from less than 2% strain in Ni 50?2 Mn 49?8 to above 10% for a Ni 40?3 Mn 50?1 Ti 9?6 (at-%) alloy and over 15% strain in Ni 39?7 Mn 50?3 Al 10 . Ductility in bending was worse than in compression in all cases, but up to 10% strain in bending was still possible without cracking in Ni 39?7 Mn 50?3 Al 10 .…”

Section: Iii1?4 Co Based Non-thermoelastic Htsmasmentioning

confidence: 99%

“…Ductility in bending was worse than in compression in all cases, but up to 10% strain in bending was still possible without cracking in Ni 39?7 Mn 50?3 Al 10 . 233 The improvements due to Ti addition were argued to be caused by a decrease in grain size, and improvements from Al addition to be a result of the formation of the ductile c phase. Replacement of Ni by Al, Ti, Cu or Fe reduces transformation temperatures more than replacement of Ni by Mn in identical amounts.…”

Section: Iii1?4 Co Based Non-thermoelastic Htsmasmentioning

confidence: 99%

“…c phase precipitates readily in compositions where the Ni content is less than 50 at-% for binary Ni-Mn, 231 ternary Ni-Mn-Fe and Ni-Mn-Al, and quaternary Ni-Mn-Al-Fe alloys. 233,235,237 To address some of the concerns with Ni-Mn and Ni-Al based HTSMAs, unconventional processing techniques have been extensively studied. One early problem with Ni-Al alloys was the sensitivity of transformation temperatures to changes in composition, so powder metallurgy was used to produce alloys with more uniform composition and enable better composition control.…”

Section: Iii1?4 Co Based Non-thermoelastic Htsmasmentioning

confidence: 99%

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High temperature shape memory alloys

Ma¹,

Караман²,

Noebe³

2010

International Materials Reviews

848

371

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Shape memory alloys (SMAs) with high transformation temperatures can enable simplifications and improvements in operating efficiency of many mechanical components designed to operate at temperatures above 100uC, potentially impacting the automotive, aerospace, manufacturing and energy exploration industries. A wide range of these SMAs exists and can be categorised in three groups based on their martensitic transformation temperatures: group I, transformation temperatures in the range of 100-400uC; group II, in the range of 400-700uC; and group III, above 700uC. In addition to the high transformation temperatures, potential high temperature shape memory alloys (HTSMAs) must also exhibit acceptable recoverable transformation strain levels, long term stability, resistance to plastic deformation and creep, and adequate environmental resistance. These criteria become increasingly more difficult to satisfy as their operating temperatures increase, due to greater involvement of thermally activated mechanisms in their thermomechanical responses. Moreover, poor workability, due to the ordered intermetallic structure of many HTSMA systems, and high material costs pose additional problems for the commercialisation of HTSMAs. In spite of these challenges, progress has been made through compositional control, alloying, and the application of various thermomechanical processing techniques to the point that several likely applications have been demonstrated in alloys such as Ti-Ni-Pd and Ti-Ni-Pt. In the present work, a comprehensive review of potential HTSMA systems are presented in terms of physical and thermomechanical properties, processing techniques, challenges and applications.

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Section: Iii1?4 Co Based Non-thermoelastic Htsmasmentioning

confidence: 99%

Section: Iii1?4 Co Based Non-thermoelastic Htsmasmentioning

confidence: 99%

Section: Iii1?4 Co Based Non-thermoelastic Htsmasmentioning

confidence: 99%

See 1 more Smart Citation

High temperature shape memory alloys

Ma¹,

Караман²,

Noebe³

2010

International Materials Reviews

848

371

View full text Add to dashboard Cite

show abstract

“… 80 As previously mentioned, in Heusler alloys, substitution is understood in terms of the number of valence electrons, where going way from the e/a of MnNi (8.5) lowers the transition temperature. 17 In the case of Ni 2 Mn 1– x Ti x , there is effectively an isostructural substitution of the NiMn alloy that has a high T M of 973 K 84 toward an austenite ground state since the higher Ti content lowers T M until the transition vanishes. At the same time, Co is added to manipulate the magnetic ground state and thus the CTW.…”

Section: Resultsmentioning

confidence: 99%

High-Throughput Screening of All-d-Metal Heusler Alloys for Magnetocaloric Applications

Fortunato,

Li,

Schönecker

et al. 2024

Chem. Mater.

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Due to their versatile composition and customizable properties, A 2 BC Heusler alloys have found applications in magnetic refrigeration, magnetic shape memory effects, permanent magnets, and spintronic devices. The discovery of all-d-metal Heusler alloys with improved mechanical properties compared to those containing main group elements presents an opportunity to engineer Heusler alloys for energy-related applications. Using high-throughput densityfunctional theory calculations, we screened magnetic all-d-metal Heusler compounds and identified 686 (meta)stable compounds. Our detailed analysis revealed that the inverse Heusler structure is preferred when the electronegativity difference between the A and B/C atoms is small, contrary to conventional Heusler alloys. Additionally, our calculations of Pugh ratios and Cauchy pressures demonstrated that ductile and metallic bonding are widespread in all-d-metal Heuslers, supporting their enhanced mechanical behavior. We identified 49 compounds with a double-well energy surface based on Bain path calculations and magnetic ground states, indicating their potential as candidates for magnetocaloric and shape memory applications. Furthermore, by calculating the free energies, we propose that 11 compounds exhibit structural phase transitions and suggest isostructural substitutions to enhance the magnetocaloric effect.

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“…However, some serious problems still remain unsolved in this system, namely polycrystalline brittleness and poor shape memory effects (SMEs). In order to overcome these problems, several attempts by alloying have been made, such as Ni-Mn-Ti and Ni-Mn-Al ternary alloys [5][6][7]. Additionally, two-phase microstructure of β(B2) + γ is obtained by alloying, which is beneficial for the ductility improvement of Ni-Mn SMAs [6][7].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Phase Transformation Behavior of Ni-Mn-Fe High-Temperature Shape Memory Alloys

Wang

Liu

Yang

et al. 2015

MSF

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The microstructure and phase transformation behavior of Ni-Mn-Fe high-temperature shape memory alloys including Ni40+xFe10Mn50-x (x = 0, 10) were investigated. The results show that both two alloys exhibit single fcc γ phase annealed at 900°C for 1 day. When these quenched alloys are again annealed at 500°C for 20 days, they almost exhibit main tetragonal θ martensite. The microstructural evolutions are consistent with the results of phase transformation measurements. It is clearly found that there is an irreversible phase transformation around 480°C ~ 570°C, which is associated with the formation of tetragonal θ martensite from γ phase. Afterwards, the reversible martensitic transformation occurs during heating and cooling with very high transformation temperature.

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The Martensitic Structure and Shape Memory Effect in NiMn Alloyed by Ti and Al

Cited by 3 publications

References 0 publications

High temperature shape memory alloys

High temperature shape memory alloys

High-Throughput Screening of All-d-Metal Heusler Alloys for Magnetocaloric Applications

Microstructure and Phase Transformation Behavior of Ni-Mn-Fe High-Temperature Shape Memory Alloys

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