2004
DOI: 10.1016/j.actamat.2003.08.036
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Martensitic phase transformations in nanocrystalline NiTi studied by TEM

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Cited by 520 publications
(231 citation statements)
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“…The nanosize particles with (001) 18R microtwins or basal plane stacking faults occupy entire volume of particles; no martensite plates or accommodation groups of martensite are seen. Similar microstructure of martensite has be observed by T. Waitz et al [17] in nanosize grains after isothermal annealing of high-pressure torsion deformed amorphous Ni-50.3 at.% Ti as well as in NiTi nanocrystals embedded into the amorphous matrix [18]. Other peculiarity is that the width of microtwins (or stacking faults) is different and their appearing is irregular.…”
Section: Microstructure Of the Micron- Submicron-and Nanoparticlessupporting
confidence: 55%
“…The nanosize particles with (001) 18R microtwins or basal plane stacking faults occupy entire volume of particles; no martensite plates or accommodation groups of martensite are seen. Similar microstructure of martensite has be observed by T. Waitz et al [17] in nanosize grains after isothermal annealing of high-pressure torsion deformed amorphous Ni-50.3 at.% Ti as well as in NiTi nanocrystals embedded into the amorphous matrix [18]. Other peculiarity is that the width of microtwins (or stacking faults) is different and their appearing is irregular.…”
Section: Microstructure Of the Micron- Submicron-and Nanoparticlessupporting
confidence: 55%
“…For example, when the characteristic size (e.g. grain size or pillar diameter) is decreased into the nanometer range, a loss of superelasticity and shape memory has been reported for Ni-Ti, such as for a grain size below ~50 nm [1, 10,11]. Similarly, for Fe-Ni powders subjected to quenching through the transformation temperature, the probability of martensite formation decreases with decreasing particle diameter in the micron range [12].…”
Section: Introductionmentioning
confidence: 99%
“…The development of nanocrystalline Nitinol has been the subject of intensive research, because fine grained or nanocrystalline material shows a variety of different and improved properties compared to the conventional coarse-grained polycrystalline material [8][9][10][11][12][13][14][15][16]. Recently, bulk nanocrystalline NiTi has attracted much interest as a high-tech material, showing enhanced shape memory behavior and superelasticity with ultra high recovery stress [9,10].…”
Section: Introductionmentioning
confidence: 99%
“…HPT (high pressure torsion) is one of the methods that allow obtaining nano-structured materials with new and unique properties and small grain size [11]. Combining HPT and subsequent annealing treatments one can tune the grain size and as a result the properties of the material can be controlled [12][13][14]. One prominent example is the size effect that can significantly shift the transformation from the cubic B2 high temperature phase to the monoclinic B19' martensite; grains with a size less than 50 nm can even lead to the complete suppression of the transformation [15,16].…”
Section: Introductionmentioning
confidence: 99%