Unusual reversible twinning modes and giant superelastic strains in FeNiCoAlNb single crystals. (1st July 2016)

• Record Type: Journal Article
• Authors: Chumlyakov, Y.I.; Kireeva, I.V.; Kutz, O.A.; Turabi, A.S.; Karaca, H.E.; Karaman, I.
• Is Part Of: Scripta materialia. Volume 119(2016)
• Page Start: 43
• Page End: 46
• Publication Date: 2016-07-01
• Subjects: Superelasticity -- Iron-based shape memory alloys -- FeNiCoAlNb -- Twinning -- Superelastic Strain; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2016.03.027
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: The superelastic response of the Fe41 Ni28 Co17 Al11.5 Nb2.5 (at. %) single crystals oriented along the [001] direction was investigated in tension at various temperatures after aging at 973 K for 0.5 h. The aging treatment led to the formation of ordered γ' particles with particle sizes of less than 3 nm. Abnormally large reversible strain of up to 15.3% was observed at 77 K, the highest ever reported for an iron-based shape memory alloys. It has been revealed that this giant superelastic strain, significantly higher than the theoretical transformation strain, is associated with γ-α' martensitic transformation and elastic mechanical twinning of < 011 >{110} type. Graphical abstract: