Journal of Materials Science

, Volume 51, Issue 1, pp 457–466

Stress-assisted removal of conjugation boundaries in non-modulated Ni–Mn–Ga by coordinated secondary twinning

  • B. Muntifering
  • L. Kovarik
  • N. D. Browning
  • R. C. Pond
  • W. B. Knowlton
  • P. Müllner
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DOI: 10.1007/s10853-015-9236-1

Cite this article as:
Muntifering, B., Kovarik, L., Browning, N.D. et al. J Mater Sci (2016) 51: 457. doi:10.1007/s10853-015-9236-1

Abstract

Observations are presented, obtained by in situ straining and conventional TEM, of a transformation mechanism by coordinated secondary twinning predicted by Mullner and King. The material studied is the martensitic phase of a non-modulated Ni–Mn–Ga alloy, which exhibits a microstructure comprising domains of lamellar matrix/twin composites. Straining these specimens induced lamellar domains to transform into their conjugate counterparts. In this process, secondary twinning generates a change of misorientation between the matrix and twin lamellae of the initial domain by nearly 23°. The orientation evolves over a region behind the transformation front about 100 nm in extent.

Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  • B. Muntifering
    • 1
  • L. Kovarik
    • 2
  • N. D. Browning
    • 2
  • R. C. Pond
    • 3
  • W. B. Knowlton
    • 1
    • 4
  • P. Müllner
    • 1
  1. 1.Department of Materials Science and EngineeringBoise State UniversityBoiseUSA
  2. 2.Environmental Molecular Sciences LaboratoryPacific Northwest National LaboratoryRichlandUSA
  3. 3.College of Engineering, Mathematics and Physical SciencesUniversity of ExeterExeterUK
  4. 4.Department of Electrical and Computer EngineeringBoise State UniversityBoiseUSA