Investigation of the two-way shape memory effect in [001]-oriented Co35Ni35Al30 single crystals

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Investigation of the two-way shape memory effect in [001]-oriented Co35Ni35Al30 single crystals	981 KB	Adobe Acrobat PDF	Read	Download
DOI Доступ к ресурсу на сайте издателя			10.1063/1.4937824

Title: Investigation of the two-way shape memory effect in [001]-oriented Co35Ni35Al30 single crystals
Creator: Eftifeeva, Anna S.
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Chumlyakov, Yuri I.
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Maier, Hans Jürgen
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Panchenko, Elena Yu.
Date: 2016
DOI: 10.1063/1.4937824
Description: For the first time, a study of the two-way shape memory effect (the TWSME) for the quenched and aged at 673 K for 0.5 h [001]-oriented Co35Ni35Al30 single crystals in compression was carried out. In the quenched CoNiAl crystals, the TWSME with a reversible strain of (-3.1 ± 0.3) % was induced by training procedure in the superelasticity temperature range. The physical reason of the TWSME is the creation of internal stress fields due to the formation of dislocations next to γ-phase particles, and an interface between the B2-matrix and the γ-phase in the quenched crystals. It was experimentally shown that aging at 673 K for 0.5 h under a compressive stress of 100 MPa along the [110] direction creates the conditions necessary for observing the TWSME, without additional training with a reversible strain of (+2.2 ± 0.3) %. The conditions for observing the TWSME are determined by the action of the internal stress fields of 25 MPa created by the oriented arrangement of the dispersed particles in the stress-assisted aged crystals. The TWSME is not observed in the stress-free aged crystals with non-oriented precipitation of particles, both before and after training.

Created: 17-04-2018

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Сибирский физико-технический институт Investigation of the two-way shape memory effect in [001]-oriented Co35Ni35Al30 single crystals