Structure changes during pseudoelastic deformation of CuAlMn single crystals

Dutkiewicz, J.; Katô, Hirofumi; Miura, S.; Messerschmidt, U.; Bartsch, M.

doi:10.1016/1359-6454(96)00086-9

Cited by 30 publications

(20 citation statements)

References 10 publications

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“…When a stress applied in the sample was higher than the critical stress of MT, a stress-induced MT of β 1 → β 1 occurred and the β 1 martensite had an 18R ordered structure. The phase structure and transformation behavior have been determined by X-ray diffraction (XRD, SmartLab, Rigaku Corporation, Matsubara-cho, Akishima-shi, Tokyo, Japan) and transmission electron microscopy (TEM, F20, FEI, Hillsboro, OR, USA) operated at 200 kV at room temperature in previous work by authors and other researchers [18][19][20][21][22].…”

Section: Resultsmentioning

confidence: 99%

Effects of Strain Rate and Measuring Temperature on the Elastocaloric Cooling in a Columnar-Grained Cu71Al17.5Mn11.5 Shape Memory Alloy

Wang

Huang

Xie

2017

Metals

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Solid-state refrigeration technology based on elastocaloric effects (eCEs) is attracting more and more attention from scientists and engineers. The response speed of the elastocaloric materials, which relates to the sensitivity to the strain rate and measuring temperature, is a significant parameter to evaluate the development of the elastocaloric material in device applications. Because the Cu-Al-Mn shape memory alloy (SMA) possesses a good eCE and a wide temperature window, it has been reported to be the most promising elastocaloric cooling material. In the present paper, the temperature changes (∆T) induced by reversible martensitic transformation in a columnar-grained Cu 71 Al 17.5 Mn 11.5 SMA fabricated by directional solidification were directly measured over the strain rate range of 0.005-0.19 s −1 and the measuring temperature range of 291-420 K. The maximum adiabatic ∆T of 16.5 K and a lower strain-rate sensitivity compared to TiNi-based SMAs were observed. With increasing strain rate, the ∆T value and the corresponding coefficient of performance (COP) of the alloy first increased, then achieved saturation when the strain rate reached 0.05 s −1 . When the measuring temperature rose, the ∆T value increased linearly while the COP decreased linearly. The results of our work provide theoretical reference for the design of elastocaloric cooling devices made of this alloy.

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Section: Resultsmentioning

confidence: 99%

Effects of Strain Rate and Measuring Temperature on the Elastocaloric Cooling in a Columnar-Grained Cu71Al17.5Mn11.5 Shape Memory Alloy

Wang

Huang

Xie

2017

Metals

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“…3) serve as sites of preferential nucleation of 1 , probably because of their crystallographic geometry. Nucleation of 18R martensite on the tip of a 2H martensite needle during in-situ TEM straining experiments was described also in CuAlMn alloy [13].…”

Section: Discussionmentioning

confidence: 99%

“…The analysis, however, was made ex-situ on stress-induced martensites in the unstressed state. In order to obtain a closer insight into the dynamically evolving microstructures, in-situ TEM straining experiments seem to be a very suitable technique [12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

In-situTEM study of stress-induced transformations in CuAlNi

Zárubová

Gemperlová

Gemperle

et al. 2009

ESOMAT 2009 - 8th European Symposium on Martensitic Transformations

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Abstract. Stress-induced martensitic transformations and twinning processes were studied in thin foils of CuAlNi single crystals strained in-situ in a transmission electron microscope. A detailed structure analysis comprised identification of phases existing under stress and determination of their mutual crystallographic orientation. Three transformation processes were detected: i) transformation of austenite into 2H martensite at low stress levels; ii) twinning/detwinning processes in 2H martensite, and iii) transformation between austenite and 18R martensite at higher stress levels. Nucleation and growth of martensite plates were followed, and morphology of the austenite/martensite habit planes was examined. Existence of planar interfaces between a single variant of 2H martensite and austenite on microscopic level was proved.

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“…In this study, however, measurable Laue spots of SM were hardly obtained due to low intensity, and therefore strain/stresses were measured only for the parent phase. [9].…”

Section: White X-ray Microbeam Diffraction Experimentsmentioning

confidence: 99%

Characterization of Deformation Behavior of Individual Grains in Polycrystalline Cu-Al-Mn Superelastic Alloy Using White X-ray Microbeam Diffraction

Kwon

Sato

Fujieda

et al. 2015

Metals

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White X-ray microbeam diffraction was applied to investigate the microscopic deformation behavior of individual grains in a Cu-Al-Mn superelastic alloy. Strain/stresses were measured in situ at different positions in several grains having different orientations during a tensile test. The results indicated inhomogeneous stress distribution, both at the granular and intragranular scale. Strain/stress evolution showed reversible phenomena during the superelastic behavior of the tensile sample, probably because of the reversible martensitic transformation. However, strain recovery of the sample was incomplete due to the residual martensite, which results in the formation of local compressive residual stresses at grain boundary regions. OPEN ACCESSMetals 2015, 5 1846

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Structure changes during pseudoelastic deformation of CuAlMn single crystals

Cited by 30 publications

References 10 publications

Effects of Strain Rate and Measuring Temperature on the Elastocaloric Cooling in a Columnar-Grained Cu71Al17.5Mn11.5 Shape Memory Alloy

Effects of Strain Rate and Measuring Temperature on the Elastocaloric Cooling in a Columnar-Grained Cu71Al17.5Mn11.5 Shape Memory Alloy

In-situTEM study of stress-induced transformations in CuAlNi

Characterization of Deformation Behavior of Individual Grains in Polycrystalline Cu-Al-Mn Superelastic Alloy Using White X-ray Microbeam Diffraction

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