Branched needle microstructure in Ni-Mn-Ga 10M martensite: EBSD study

Research output: Contribution to journalArticleScientificpeer-review

Researchers

  • R. Chulist
  • L. Straka
  • A. Sozinov
  • T. Tokarski
  • W. Skrotzki

Research units

  • Institute of Metallurgy and Materials Science of the Polish Academy of Sciences
  • Technische Universität Dresden
  • Institute of Physics ASCR
  • AGH University of Science and Technology
  • Lappeenranta University of Technology

Abstract

Interaction of conjugate twin boundaries under applied stress was studied using electron backscatter diffraction in the scanning electron microscope. Compression and unloading resulted in a recoverable strain. EBSD maps and BSE images reveal a branched needle microstructure inside and outside the central triangle domain. Type I twin boundaries are mostly observed inside the central domain while some type II twin boundaries can be predominantly detected outside. Moreover, a characteristic branching of modulation domains close to the intersection of conjugate boundaries is observed. A mechanism of twin annihilation based on the rigid body rotation is proposed. The shape and distribution of stress-induced twins is explained by minimizing of elastic energy.

Details

Original languageEnglish
Pages (from-to)113-119
Number of pages7
JournalActa Materialia
Volume128
Publication statusPublished - 15 Apr 2017
MoE publication typeA1 Journal article-refereed

    Research areas

  • EBSD, NiMnGa, Pseudoelasticity, Twinning

ID: 11078002