Mechanism of deformation and crystal lattice reorientation in strain localization bands and deformation twins of the B2 phase of titanium nickelide

Tyumentsev, А. N.; Surikova, N. S.; Litovchenko, I. Yu.; Pinzhin, Yu. P.; Коротаев, А. Д.; Lysenko, O. V.

doi:10.1016/j.actamat.2004.01.001

Cited by 55 publications

(35 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…However, from the conventional load-elongation studies, it is known that when the austenite phase is deformed, after the initial elastic response, stressinduced martensite (SIM) transformation takes place followed by the elastic and plastic responses of SIM leading to failure [28,29]. Recently, similar to the present observation, Tyumentsev et al [30] observed deformation of B2 phase yielding B2 on rolling of NiTiFe single crystals. They suggested a new mechanism of twinning in these alloys through the forward plus reverse B2 ?…”

Section: Effect Of Hpt Applied On the As-received Conditions Of Alloyssupporting

confidence: 81%

Stability of thermal-induced phase transformations in the severely deformed equiatomic Ni–Ti alloys

2012

View full text Add to dashboard Cite

Nickel-Titanium (Ni-Ti) alloys of two different near-equiatomic chemical compositions (Ni-rich and Ti-rich) are subjected to severe plastic deformation by means of high pressure torsion (HPT) by higher rotation speed and larger total number of rotations. Further, the as-received and severely deformed specimens are subjected to heat treatments at 300 and 350°C. Phase transformations of the specimens under different conditions are analyzed by employing differential scanning calorimetry and by X-ray diffraction. The results obtained show that in Ti-rich Ni-Ti alloy the sequence of phase transformations is found to be stable against heat treatments and independent of previous HPT process. Also, in Ni-rich Ni-Ti alloy, when it is subjected to HPT, the sequence of phase transformations found to remain unaltered. However, with or without HPT, after the heat treatments at 300 and 350°C, the sequence of the phase transformation is found to be affected.

show abstract

Section: Effect Of Hpt Applied On the As-received Conditions Of Alloyssupporting

confidence: 81%

Stability of thermal-induced phase transformations in the severely deformed equiatomic Ni–Ti alloys

2012

View full text Add to dashboard Cite

show abstract

“…Figure 5 presents an example of a bcc→hcp→bcc-transformation resulting in a 60°[110] crystal-lattice reorientation. It was shown in [12,15,17] that in the case where the Kurdyumov-Zaks relation is fulfilled in the course of an MT, the number of alternative systems of reverse transformation is increased, which gives rise to the following versions of reorientations: 10.5°<110>, 49.5°<110>, 60°<110> and 70.5°<110>. Furthermore, multiple direct-plusreverse transformations are very likely to occur and be followed by multiple crystal-lattice reorientations.…”

Section: Discussion Of Resultsmentioning

confidence: 95%

“…In this version, a direct (bcc→fcc, Fig. 5a) transformation, apart from cooperative displacements of atomic planes (110) along [110 ] and [110 ] not shown here (for details, see, e.g., [13,[15][16][17][18]), involves homogenous deformation transforming these planes into close-packed hcp-phases, in the case where the Nishiyama-Wassermann (N-W) relation is fulfilled.…”

Section: Discussion Of Resultsmentioning

confidence: 99%

“…Here belong initiation of partial and complete dislocations in fcc-nanocrystals [19,20], non-polar mechanisms of mechanical twinning in these materials [19,20], deformation twinning in the planes with different indices in TiNi alloys [14,15], formation of localized strain bands with crystal lattice reorientations at ≈ 35°<110> and 60°<110> in austenite steels [13,14,16] and, finally, the reorientation bands (50-60)°<110> in bcc-alloys discussed in [12].…”

Section: Discussion Of Resultsmentioning

confidence: 99%

“…Therefore, here we shall report but only briefly their potential to describe certain phenomena of plastic deformation and crystal-lattice reorientation, and present one of the atomic models of formation of reorientation bands (50-60)°<110> observed in an bcc-crystal in the present work. To develop the models, the authors of [7,[13][14][15][16][17] used the geometrical theory of martensitic (bcc →fcc and bcc→hcp) transformations (MT) [18], where atomic rearrangements represent combined cooperative atomic shears (shufflings) in close-packed planes of the bcc-lattice and homogeneous deformation of the Bein-type transformation.…”

Section: Discussion Of Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Microstructure of Mo – 47% Re – 0.4% Zr alloys after rolling at room temperature. II. Peculiarities of mechanical twinning and formation of high-angle boundaries between microbands

2011

View full text Add to dashboard Cite

It is shown that the Mo -47% Re -0.4% Zr alloy after rolling deformation (ε ≈ 90%) at room temperature exhibits certain characteristic features, such as increased density of deformation defects with considerably faceted noncoherent boundaries and reorientation microbands with a specific range of high-angle disorientations around the direction of the 〈110〉 type. Using the concepts on direct-plus-reverse (along alternative systems) martensitic transformations as the mechanisms of plastic deformation and crystal-lattice reorientation, an analysis of possible mechanisms for formation of these states is made.

show abstract

Mechanisms of deformation localization and mechanical twinning under the conditions of phase instability of a crystal in stress fields

et al. 2004

View full text Add to dashboard Cite

A new mechanism of the deformation and reorientation of a crystal has been studied experimentally and theoretically. This mechanism, which is effective in strain localization mechanical twinning bands of metal alloys and intermetallides, is a mechanism of dynamic phase (direct plus reverse martensitic) transformations in fields of high local stresses. The features of the reorientation and the defect substructure in these bands are discussed using electron microscopy data. With models of martensitic transformations based on the concept of cooperative thermal vibrations of extended coherent objects in crystals, the atomic mechanisms of direct plus reverse transformations are analyzed and the reorientation matrices (vectors) and distortion tensors are calculated for some (fcc → bcc → fcc, bcc → hcp → bcc) variants of these transformations. The carriers and nature of the above deformation mechanism and the principal physical effects underlying this mechanism are discussed.

show abstract

Mechanism of deformation and crystal lattice reorientation in strain localization bands and deformation twins of the B2 phase of titanium nickelide

Cited by 55 publications

References 6 publications

Stability of thermal-induced phase transformations in the severely deformed equiatomic Ni–Ti alloys

Stability of thermal-induced phase transformations in the severely deformed equiatomic Ni–Ti alloys

Microstructure of Mo – 47% Re – 0.4% Zr alloys after rolling at room temperature. II. Peculiarities of mechanical twinning and formation of high-angle boundaries between microbands

Mechanisms of deformation localization and mechanical twinning under the conditions of phase instability of a crystal in stress fields

Contact Info

Product

Resources

About