Ultrahigh damping and Young's modulus softening due to a/b twins in 10M Ni-Mn-Ga martensite. (15th March 2020)

• Record Type: Journal Article
• Authors: Kustov, S.; Saren, A.; Sozinov, A.; Kaminskii, V.; Ullakko, K.
• Is Part Of: Scripta materialia. Number 178(2020)
• Page Start: 483
• Page End: 488
• Publication Date: 2020-03-15
• Subjects: Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2019.12.024
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: We study Young's modulus and damping of 10M martensite in Ni50.0 Mn28.4 Ga21.6 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. Graphical abstract: Image, graphical abstract