In Situ Neutron Diffraction Analyzing Stress-Induced Phase Transformation and Martensite Elasticity in [001]-Oriented Co49Ni21Ga30 Shape Memory Alloy Single Crystals

Reul, A.; Lauhoff, C.; Krooß, P.; Gutmann, Matthias J.; Kadletz, Peter M.; Chumlyakov, Yu. I.; Niendorf, Т.; Schmahl, Wolfgang W.

doi:10.1007/s40830-018-0156-1

Cited by 9 publications

(2 citation statements)

References 27 publications

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“…Among the alternative candidate systems, the Heuslertype Co-Ni-Ga alloys undergoing a martensitic transformation (MT) from B2-ordered austenite to L1 0 martensite [5] have received increasing attention [6]. In CONTACT C. Lauhoff lauhoff@uni-kassel.de Institute of Materials Engineering, University of Kassel, Kassel 34125, Germany single-crystalline state, Co-Ni-Ga shows excellent functional performance at elevated temperatures, i.e.…”

Section: Introductionmentioning

confidence: 99%

Excellent superelasticity in a Co-Ni-Ga high-temperature shape memory alloy processed by directed energy deposition

Lauhoff

Sommer

Vollmer

et al. 2020

Materials Research Letters

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A Co-Ni-Ga high-temperature shape memory alloy has been additively manufactured by directed energy deposition. Due to the highly anisotropic microstructure, i.e. columnar grains featuring a strong near-001 texture in build direction, the as-built material is characterized by a very low degree of constraints and, thus, shows excellent superelasticity without conducting a post-process heat treatment. As characterized by in situ deformation testing and post-mortem microstructural analysis, additive manufacturing employing directed energy deposition seems to be highly promising for processing of shape memory alloys, which often suffer difficult workability. IMPACT STATEMENTThe present work establishes a new pathway towards realization of high performance shape memory alloys by additive manufacturing and, thus, will stimulate further research in this field directed towards application.

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Section: Introductionmentioning

confidence: 99%

Excellent superelasticity in a Co-Ni-Ga high-temperature shape memory alloy processed by directed energy deposition

Lauhoff

Sommer

Vollmer

et al. 2020

Materials Research Letters

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“…The investigated Co–Ni–Ga Heusler alloy undergoes a first‐order magnetostructural transformation (FOMST) from high‐temperature B 2‐ordered austenite to low‐temperature tetragonal L 1 0 martensite. [ 13 ] A fully reversible superelastic response as well as excellent cyclic stability up to temperatures of 373 K has been reported for single crystals. [ 12 ] However, polycrystalline Co–Ni–Ga as well as other polycrystalline Heusler alloys suffer from intergranular cracking and premature failure after several transformation cycles due to the anisotropic volume change of randomly orientated grains.…”

Section: Introductionmentioning

confidence: 99%

On the Impact of Additive Manufacturing Processes on the Microstructure and Magnetic Properties of Co–Ni–Ga Shape Memory Heusler Alloys

et al. 2022

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Ferromagnetic shape memory alloys (FMSMAs) show a large magnetic fieldinduced strain up to 10%, [1,2] which makes this materials interesting for magnetic actuators. [3] A promising material class for FMSMAs are Heusler alloys, such as Ni-Mn-X (X: Ga, In, Sn, Al), [2,[4][5][6][7][8] Ni-Fe-Ga, [9] or Co-Ni-X (X: Al, Ga), [10][11][12] exhibiting a large shape memory effect owing to a reversible martensitic transformation. The investigated Co-Ni-Ga Heusler alloy undergoes a first-order magnetostructural transformation (FOMST) from hightemperature B2-ordered austenite to lowtemperature tetragonal L1 0 martensite. [13] A fully reversible superelastic response as well as excellent cyclic stability up to temperatures of 373 K has been reported for single crystals. [12] However, polycrystalline Co-Ni-Ga as well as other polycrystalline Heusler alloys suffer from intergranular cracking and premature failure after several transformation cycles due to the anisotropic volume change of randomly orientated grains. [14,15]

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Additive Manufacturing of Co-Ni-Ga High-Temperature Shape Memory Alloy: Processability and Phase Transformation Behavior

Lauhoff

Fischer

Sobrero

et al. 2020

Metall Mater Trans A

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In Situ Neutron Diffraction Analyzing Stress-Induced Phase Transformation and Martensite Elasticity in [001]-Oriented Co49Ni21Ga30 Shape Memory Alloy Single Crystals

Cited by 9 publications

References 27 publications

Excellent superelasticity in a Co-Ni-Ga high-temperature shape memory alloy processed by directed energy deposition

Excellent superelasticity in a Co-Ni-Ga high-temperature shape memory alloy processed by directed energy deposition

On the Impact of Additive Manufacturing Processes on the Microstructure and Magnetic Properties of Co–Ni–Ga Shape Memory Heusler Alloys

Additive Manufacturing of Co-Ni-Ga High-Temperature Shape Memory Alloy: Processability and Phase Transformation Behavior

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