Geometrical Models and Matrices for Structures at Intersection of Crossing ε-Martensite Variants

40 Pages Posted: 16 Aug 2019

See all articles by Takahiro Sawaguchi

Takahiro Sawaguchi

National Institute for Materials Science - Research Center for Structural Materials

Wataru Tasaki

National Institute for Materials Science; University of Tsukuba; Research Fellow of Japan Society for the Promotion of Science

Ilya Nikulin

National Institute for Materials Science

Fumiyoshi Yoshinaka

National Institute for Materials Science

Susumu Takamori

National Institute for Materials Science

Koichi Tsuchiya

National Institute for Materials Science; University of Tsukuba

Irina V. Kireeva

Tomsk State University - Siberian Physical-Technical Institute

Yuriy Chumlyakov

Tomsk State University - Department of Physics of Metals; Tomsk State University - Siberian Physical-Technical Institute

Abstract

Deformation-induced martensitic transformation from face-centred-cubic γ-austenite to hexagonal close-packed ε-martensite and body-centred-tetragonal α'-martensite has attracted much attention owing to the transformation-induced plasticity effect in austenitic stainless steels, high- and medium-Mn austenitic steels, ferrous shape memory alloys, and high entropy alloys. For better understanding of the complicated triple γ/ε/α' phase deformation microstructure, various structures at the intersection of different variants of deformation-induced ε-martensite are examined. A type-316 austenitic steel single crystal is compressively deformed along the [0 0 1]γ axis at a cryogenic temperature (173 K), and a deformation microstructure on the (1 1 0)γ surface is observed by means of scanning electron microscopy equipped with an electron backscattering diffraction analysis system. Depending on the shear angle with respect to the intersection axis, either 90º (Type I) or 30º (Type II), three types of atomic rearrangements of the intersection volume are observed: (1) reverse transformation into the γ-phase, which is rotated by 90º from the parent γ-austenite (Type I); (2) 10-12 twinning of either crossing ε-martensite variants (Type I); (3) secondary martensitic transformation into α'-martensite (Type II). Transformation matrices for the intersection products are built, which are then used to successfully calculate their crystallographic orientations starting from the orientation of the parent γ-phase. In addition, the atomic rearrangements and orientational changes are visualized by the distortion and/or kinking of Thompson's regular tetrahedron representing the initial atomic arrangement and the orientation of the parent γ-phase.

Keywords: Martensitic phase transformations, Deformation twinning, Crystallographic orientation, Electron backscattered diffraction (EBSD), Single crystal

Suggested Citation

Sawaguchi, Takahiro and Tasaki, Wataru and Nikulin, Ilya and Yoshinaka, Fumiyoshi and Takamori, Susumu and Tsuchiya, Koichi and Kireeva, Irina V. and Chumlyakov, Yuriy, Geometrical Models and Matrices for Structures at Intersection of Crossing ε-Martensite Variants. Available at SSRN: https://ssrn.com/abstract=3436420 or http://dx.doi.org/10.2139/ssrn.3436420

Takahiro Sawaguchi (Contact Author)

National Institute for Materials Science - Research Center for Structural Materials ( email )

Tsukuba
Japan

Wataru Tasaki

National Institute for Materials Science ( email )

Tsukuba, Ibaraki 305-0047
Japan

University of Tsukuba ( email )

Tsukuba University , Ibaraki Ken
Tsukuba, Ibaraki 305-8573, Ibaraki 3050006
Japan

Research Fellow of Japan Society for the Promotion of Science ( email )

Japan

Ilya Nikulin

National Institute for Materials Science ( email )

Tsukuba, Ibaraki 305-0047
Japan

Fumiyoshi Yoshinaka

National Institute for Materials Science ( email )

Tsukuba, Ibaraki 305-0047
Japan

Susumu Takamori

National Institute for Materials Science ( email )

Tsukuba, Ibaraki 305-0047
Japan

Koichi Tsuchiya

National Institute for Materials Science ( email )

Tsukuba, Ibaraki 305-0047
Japan

University of Tsukuba ( email )

Tsukuba University , Ibaraki Ken
Tsukuba, Ibaraki 305-8573, Ibaraki 3050006
Japan

Irina V. Kireeva

Tomsk State University - Siberian Physical-Technical Institute ( email )

Russia

Yuriy Chumlyakov

Tomsk State University - Department of Physics of Metals

Lenin Ave. 36
Tomsk, 634050
Russia

Tomsk State University - Siberian Physical-Technical Institute ( email )

Russia

Here is the Coronavirus
related research on SSRN

Paper statistics

Downloads
33
Abstract Views
199
PlumX Metrics