Atomic scale understanding the periodic modulation in ferroelastic alloy Ni-Mn-Ti

Liu, Die; Gou, Junming; Xu, Zhitong; Liu, Yao; Ma, Tianyu

doi:10.1016/j.actamat.2023.118768

Cited by 7 publications

(2 citation statements)

References 62 publications

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“…Beyond the difference in alloy system and structure of martensites between the present work and ref. [48], both observations are very good in line complementing the reported experiments by in situ TEM observations.…”

Section: Resultssupporting

confidence: 90%

“…Interestingly, a similar transformation sequence using (101)[1

0\bar{1}

] shear and periodic shuffling on (110) along [1

\bar{1}

0] from austenite to 6O and 4O was observed in the NiMnTi system. [ 48 ] The authors report that tetragonal building blocks constructed based on the adaptive concept show a significant difference with the experimentally observed HRTEM lattice parameters suggesting that the atomic shuffle concept should account for the formation of modulated structures and it is also responsible for intermartensitic transformation. Beyond the difference in alloy system and structure of martensites between the present work and ref.…”

Section: Resultsmentioning

confidence: 99%

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Adaptive Phase or Variant Formation at the Austenite/Twinned Martensite Interface in Modulated Ni–Mn–Ga Martensite

Chulist,

Wójcik,

Sozinov

et al. 2024

Adv Funct Materials

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The crystal structure and transformation path from austenite to 10M martensite in Ni–Mn–Ga single crystal are examined employing high‐energy synchrotron radiation, scanning, and transmission electron microscopy. Using temperature gradient, an austenite/twinned martensite interface is stabilized revealing the crystal structure and microstructure of both phases and the transformation sequence across the interface. Depending on the distance from the interface, three distinct types of martensite crystal lattice, namely simple tetragonal and two monoclinic modulated ones, that is, 10M′ and 10M are confirmed. In situ measurements show that lattice mismatch formed at the habit plane is compensated by the formation of micro‐twinned and branched martensite along with an elastic change in lattice parameters. It is shown that the characteristics for periodic shuffling twin boundaries, such as modulation twins or inverted stacking faults, are installed in later stages of transformation. In other words, large microstructure elements that most efficiently accommodate the strain are installed first, and then smaller elements are operable. Overall, the experimental results show that the crystal lattice does not adapt modulated phase at the habit plane and cannot be built up from simple non‐modulated tetragonal blocks but rather a specific sequence of phase transformations using shear/shuffling deformation takes place.

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Section: Resultssupporting

confidence: 90%

“…Interestingly, a similar transformation sequence using (101)[1