Stress–temperature phase diagram of a ferromagnetic Ni–Mn–Ga shape memory alloy

Chernenko, V.A.; Pons, J.; Cesari, E.; Ishikawa, Keisuke

doi:10.1016/j.actamat.2005.07.018

Cited by 74 publications

(31 citation statements)

References 14 publications

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“…Note that for NM martensite, the described "(004)" line actually corresponds to the (400) NM line and to the short a NM lattice parameter (not to c NM parameter). The different lattice parameters c 10M > c 14M > a NM indicate that the 10M→14M→NM sequence can be induced also by an external compressive stress σ EXT , since the stress will preffer the shorter lattice parameter of the other phase [44].…”

Section: Alloy 1 (Cu Anode)mentioning

confidence: 99%

The relation between lattice parameters and very low twinning stress in Ni₅₀Mn_25+xGa_25−xmagnetic shape memory alloys

Straka

Drahokoupil

Pacherová

et al. 2015

Smart Mater. Struct.

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In search for the origins of the extraordinary low twinning stress of Ni-Mn-Ga magnetic shape memory alloys we studied the thermally induced changes of structure in Ni 50 Mn 25+x Ga 25−x (x=2.7-3.9) single crystal samples and compared them with twinning stress dependences. The alloys exhibited transformation to five-layered (10M) martensite structure between 297 to 328 K. All samples exhibited magnetic shape memory effect. Just below the transformation temperature the samples had very low twinning stress of about 0.1-0.3 MPa, which increased with decreasing temperature. The structural changes were monitored using X-ray diffraction in the temperature range 173-343 K. The 10M structure was approximated by monoclinic lattice with the unit cell derived from the cubic unit cell of the parent L2 1 phase. With decreasing temperature, the lattice parameters a and γ increased, c decreased, while b was nearly constant. For x ≤ 3.5, sudden sharp changes in a and b parameters additionally occurred, resulting in a = b in some regions of the phase diagram, which might be related to the refinement of twin structure of 10M martensite on nanoscale. The temperature dependences of lattice parameter γ (and c or c/a) correlate well with the temperature dependences of twinning stress in agreement with the prediction by a microstructural model of twin boundary motion. On the contrary, there is no correlation between (a − b) and twinning stress. This indicates no significant role of a/b twins or laminate in twin boundary motion mechanism and low twinning stress.

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Section: Alloy 1 (Cu Anode)mentioning

confidence: 99%

The relation between lattice parameters and very low twinning stress in Ni₅₀Mn_25+xGa_25−xmagnetic shape memory alloys

Straka

Drahokoupil

Pacherová

et al. 2015

Smart Mater. Struct.

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“…Similar intermartensitic transitions have been reported earlier in Ni-Mn-X ͑X = Ga, In͒ alloys. 8,24 The enthalpy and the entropy changes ͑⌬H M-A and ⌬S t M-A ͒ associated with the structural transition are estimated from the DSC thermograms using the following equations:…”

Section: B Calorimetric Studiesmentioning

confidence: 99%

Effect of Ni/Mn ratio on phase transformation and magnetic properties in Ni–Mn–In alloys

Rao¹,

Chandrasekaran²,

Суреш³

2010

Journal of Applied Physics

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The effect of variation in Ni/Mn ratio on structure, phase transformation, and magnetic properties was investigated in the Ni50−xMn37+xIn13 alloys. Small change in the Ni/Mn ratio drives the structure from martensite of tetragonal L10 to austenite of cubic L21 at room temperature. With decrease in Ni/Mn ratio or increase in Mn content the martensitic transformation temperature was found to decrease and the alloys do not undergo phase transformation below a critical value (7.86) of valence electron concentration (e/a). Temperature and field dependence of magnetization data reveals the complex magnetic nature arising from the coexistence of ferromagnetic and antiferromagnetic interactions in the system. It was found that the effect of Ni/Mn and Mn/In ratios on phase transformation and magnetic properties in Ni–Mn–In alloys is similar if the e/a value of the alloy system remains unchanged.

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“…The temperature difference between the start and the finish of the transition is 65 • C. Sharply separated three peaks make evidence rather for inter-martensitic transformations than for existence of three localized ranges of the different chemical compositions. Three peaks were also found on heating DSC thermogram for Ni 52.0 Mn 24.4 Ga 23.6 [13].…”

Section: Transient Rangementioning

confidence: 95%

Analysis of the thermal expansion characteristics of Ni53.6Mn27.1Ga19.3 alloy

Rudajevová

2007

Journal of Alloys and Compounds

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Stress–temperature phase diagram of a ferromagnetic Ni–Mn–Ga shape memory alloy

Cited by 74 publications

References 14 publications

The relation between lattice parameters and very low twinning stress in Ni₅₀Mn_25+xGa_25−xmagnetic shape memory alloys

The relation between lattice parameters and very low twinning stress in Ni₅₀Mn_25+xGa_25−xmagnetic shape memory alloys

Effect of Ni/Mn ratio on phase transformation and magnetic properties in Ni–Mn–In alloys

Analysis of the thermal expansion characteristics of Ni53.6Mn27.1Ga19.3 alloy

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Stress–temperature phase diagram of a ferromagnetic Ni–Mn–Ga shape memory alloy

Cited by 74 publications

References 14 publications

The relation between lattice parameters and very low twinning stress in Ni50Mn25+xGa25−xmagnetic shape memory alloys

The relation between lattice parameters and very low twinning stress in Ni50Mn25+xGa25−xmagnetic shape memory alloys

Effect of Ni/Mn ratio on phase transformation and magnetic properties in Ni–Mn–In alloys

Analysis of the thermal expansion characteristics of Ni53.6Mn27.1Ga19.3 alloy

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The relation between lattice parameters and very low twinning stress in Ni₅₀Mn_25+xGa_25−xmagnetic shape memory alloys

The relation between lattice parameters and very low twinning stress in Ni₅₀Mn_25+xGa_25−xmagnetic shape memory alloys