Open AccessВлияние термообработки на деформационные свойства кристаллов сплава Ni-=SUB=-49-=/SUB=-Fe-=SUB=-18-=/SUB=-Ga-=SUB=-27-=/SUB=-Co-=SUB=-6-=/SUB=- при их сжатии вдоль оси [011]
Author(s) -
G. A. Malygin,
В. И. Николаев,
V. M. Krymov,
А. В. Солдатов
Publication year - 2020
Publication title -
pisʹma v žurnal tehničeskoj fiziki
Language(s) - English
Resource type - Journals
eISSN - 1726-7471
pISSN - 0320-0116
DOI - 10.21883/pjtf.2020.06.49156.18123
Subject(s) - materials science , annealing (glass) , alloy , quenching (fluorescence) , analytical chemistry (journal) , crystallography , compression (physics) , crystal (programming language) , single crystal , strain (injury) , reproducibility , stress (linguistics) , metallurgy , composite material , chemistry , optics , medicine , linguistics , physics , philosophy , chromatography , computer science , fluorescence , programming language
Stress–strain diagrams (σ–ε curves) have been studied during uniaxial compression of Ni_49Fe_18Ga_27Co_6 alloy single crystals in the [011] axis direction for the initial samples and those after 15-min annealing at 1373 K with subsequent quenching in water. It was established that the σ–ε curves of initial crystals exhibited a one-stage character and showed a single stress decay, whereas the curves of heat-treated and quenched crystals displayed two stress decays. The shape-memory (SM) strain recovery on heating the compression-strained crystals showed an anomalous (burstlike) character. Investigation of the reproducibility of burstlike recovery of SM strain in a series of thermomechanical treatment cycles showed that the recovery took place in quenched crystals, whereas the temperature interval of SM recovery in the initial crystal grew from 1 to 12 K with increasing number of thermomechanical treatment cycles.