TY - JOUR

T1 - Dynamic Model for the Nanocrystalline Implementation of the γ–α Martensitic Transition with an Increased Volumetric Effect

AU - Kashchenko, M. P.

AU - Semenovykh, A. G.

AU - Nefedov, A. V.

AU - Kashchenko, N. M.

AU - Chashchina, V. G.

PY - 2022/6/1

Y1 - 2022/6/1

N2 - For the γ–α martensitic transition (MT) in iron based alloys, the possibility of wave control over the growth of martensite crystals is analyzed for the cases of a great relative increase in volume. The main deformations corresponding to the Pitch distortion tensor are used as a basis for comparison with the typical Bain deformation. Particular attention is paid to the analysis of rod-shaped martensite crystals, whose growth is controlled by three longitudinal waves propagating along the orthogonal fourth-order symmetry axes. It is shown that consistency with the values of main deformations is attained when the wave dispersion law is taken into account. The possibility for the description of similar deformations in the patterns of three-dimensional deformation including the fine structure of transition twins and the limit variant of the formation of a degenerate dislocation structure is pointed out. However, the data on the interphase orientation Pitch relations are in good agreement just with the three-wave scheme of the formation of a rod-like crystals. Moreover, the group velocity at least of one of the waves belongs to the short-wave range to result in the wave controlling front size of ≈1.6 nm in the compression deformation direction. The correction for a rod-like morphotype of martensite nanocrystals seems to be promising when interpreting the formation mechanism for the peripheral zone of lenticular crystals.

AB - For the γ–α martensitic transition (MT) in iron based alloys, the possibility of wave control over the growth of martensite crystals is analyzed for the cases of a great relative increase in volume. The main deformations corresponding to the Pitch distortion tensor are used as a basis for comparison with the typical Bain deformation. Particular attention is paid to the analysis of rod-shaped martensite crystals, whose growth is controlled by three longitudinal waves propagating along the orthogonal fourth-order symmetry axes. It is shown that consistency with the values of main deformations is attained when the wave dispersion law is taken into account. The possibility for the description of similar deformations in the patterns of three-dimensional deformation including the fine structure of transition twins and the limit variant of the formation of a degenerate dislocation structure is pointed out. However, the data on the interphase orientation Pitch relations are in good agreement just with the three-wave scheme of the formation of a rod-like crystals. Moreover, the group velocity at least of one of the waves belongs to the short-wave range to result in the wave controlling front size of ≈1.6 nm in the compression deformation direction. The correction for a rod-like morphotype of martensite nanocrystals seems to be promising when interpreting the formation mechanism for the peripheral zone of lenticular crystals.

KW - martensitic transition

KW - Pitch deformation

KW - rod-shaped nanocrystals

KW - wave control of crystal growth

KW - wave dispersion law

UR - https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=tsmetrics&SrcApp=tsm_test&DestApp=WOS_CPL&DestLinkType=FullRecord&KeyUT=000870934800009

UR - http://www.scopus.com/inward/record.url?scp=85140302920&partnerID=8YFLogxK

UR - https://elibrary.ru/item.asp?id=53342625

U2 - 10.1134/S106378342207006X

DO - 10.1134/S106378342207006X

M3 - Article

VL - 64

SP - 321

EP - 324

JO - Physics of the Solid State

JF - Physics of the Solid State

SN - 1063-7834

IS - 6

ER -