Dynamic mechanism of lateral growth of thin-lamellar martensite crystals in iron-nickel alloys under external tensile stress

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Within the framework of the dynamic theory of martensitic transformations, the possibility of cooperative growth of the faces of the resulting crystal is discussed using the example of the formation of a layer parallel to the habit plane. This growth is comparable to the lateral crystal growth typical of shape memory alloys, but not typical of α-martensite in iron alloys upon simple cooling. However, under conditions of external tensile stress, rapid lateral growth of thin-lamellar α-martensite crystals was observed. It is shown that the formation of a layer parallel to the habit plane is similar to the formation of the original crystal. The functions of the dislocation nucleation center (DNC*) for this layer are performed by a dislocation loop framing the habit plane with the Burgers vector b*, and b* is specified by the macroshift in the initial crystal. An example of a crystal with a habit close to (3 14 9) is considered. The results of calculation of the elastic field of the DNC* loop are presented using data on the elastic moduli of the Fe–31.5%Ni alloy at a temperature Ms = 239 K. In the approximation of longitudinal waves for a pair of relatively long-wave components in the control wave process, the practical coincidence of the layer habit with the initial habit is demonstrated. The value of b* has been estimated.

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作者简介

N. Kashchenko

Ural Federal University named after the First President of Russia B. N. Yeltsin; Ufa University of Science and Technology

编辑信件的主要联系方式.
Email: nad.kashenko@yandex.ru
俄罗斯联邦, Ekaterinburg; Ufa

M. Kashchenko

Ural Federal University named after the First President of Russia B. N. Yeltsin; Ural State Forestry Engineering University

Email: nad.kashenko@yandex.ru
俄罗斯联邦, Ekaterinburg; Ekaterinburg

V. Chashchina

Ural Federal University named after the First President of Russia B. N. Yeltsin; Ural State Forestry Engineering University

Email: nad.kashenko@yandex.ru
俄罗斯联邦, Ekaterinburg; Ekaterinburg

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2. Fig. 1. Scheme of lateral growth of thin-plate martensite in the Fe–31Ni–10Co–3Ti alloy caused by tensile stress at a temperature of Ms = 83 K (part of Fig. 7 in [5]).

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3. Fig. 2. Wave diagram of the formation of a prototype of a martensite plate.

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4. Fig. 3. Fragments demonstrating: a – section of a flat transformation channel formed during the propagation of a UVP. The values ​​of relatively small threshold deformations are not reflected; b – rotation of the material by an angle φ and the appearance of pure shear deformation (ΔS1 = –ΔS2 ) during finishing deformations in the case of a positive volume effect.

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5. Fig. 4. Parameters of the cylindrical coordinate system with reference to the dislocation loop: Λ1, Λ2 are the directions of the loop segments, the Z axis is collinear to the segment Λ1, the angle θ is measured from the plane of the loop.

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6. Fig. 5. Dependence of the shear value S, deformations ε1,2, and relative volume change δ on the angle θ, at Z = 0, R = 200 a (a is the lattice parameter of austenite; the origin is the center of segment Λ1, vertical lines separate the regions of dominance of shears S1 or S2, all characteristics refer to the DNC in the form of a loop framing the habit, but the symbol (*) is omitted).

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