A1 Journal article (refereed), original research

Ultrahigh damping and Young’s modulus softening due to a/b twins in 10M Ni-Mn-Ga martensite


Open Access hybrid publication

Publication Details
Authors: Kustov Sergey, Saren Andrey, Sozinov Alexei, Kaminskii Vladimir, Ullakko Kari
Publisher: Elsevier
Publication year: 2020
Language: English
Related Journal or Series Information: Scripta Materialia
Volume number: 178
Start page: 483
End page: 488
Number of pages: 6
ISSN: 1359-6462
eISSN: 1872-8456
JUFO-Level of this publication: 3
Open Access: Open Access hybrid publication

Abstract

We study Young’s modulus and damping of 10M martensite in Ni50.0Mn28.4Ga21.6 magnetic shape memory alloy using a sample without a/c twin boundaries (TBs) and maximum or zero shear stress in a/b twinning planes. Damping is ~300 times higher and modulus ~3.5 times lower when shear stress acts on a/b TBs. Ultrahigh damping and low modulus are insensitive to magnetic field, show strong strain amplitude nonlinearity and are attributed to stress-induced motion of a regular system of mobile a/b TBs. Near the reverse transformation, E001 modulus without contribution of TBs is ~10 times higher than reported previously for 10M polyvariant sample.


Last updated on 2020-23-03 at 12:09