scholarly journals Влияние 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]

2020 ◽  
Vol 46 (6) ◽  
pp. 7
Author(s):  
Г.А. Малыгин ◽  
В.И. Николаев ◽  
В.М. Крымов ◽  
А.В. Солдатов
Keyword(s):  
Shape Memory ◽  
Single Crystals ◽  
Uniaxial Compression ◽  
Temperature Interval ◽  
Thermomechanical Treatment ◽  
Axis Direction ◽  
Heat Treated ◽  
Single Stress ◽  
Subsequent Quenching ◽  
Initial Crystal

Abstract 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.

scholarly journals PSEUDO-GAP FEATURES OF INTRINSIC TUNNELING IN (HgBr2)-Bi2212 SINGLE CRYSTALS

1999 ◽  
Vol 13 (29n31) ◽  
pp. 3758-3763 ◽  
Author(s):  
AUGUST YURGENS ◽  
DAG WINKLER ◽  
TORD CLAESON ◽  
SEONG-JU HWANG ◽  
JIN-HO CHOY
Keyword(s):  
Temperature Dependence ◽  
Single Crystals ◽  
Room Temperature ◽  
Unit Cell ◽  
Superconducting Gap ◽  
Axis Direction ◽  
Temperature Range ◽  
Dynamic Conductance

The c-axis tunneling properties of both pristine Bi2212 and its HgBr 2 intercalate have been measured in the temperature range 4.2-250 K. Lithographically patterned 7-10 unit-cell heigh mesa structures on the surfaces of these single crystals were investigated. Clear SIS-like tunneling curves for current applied in the c-axis direction have been observed. The dynamic conductance d I/ d V(V) shows both sharp peaks corresponding to a superconducting gap edge and a dip feature beyond the gap, followed by a wide maximum, which persists up to a room temperature. Shape of the temperature dependence of the c-axis resistance does not change after the intercalation suggesting that a coupling between CuO 2-bilayers has little effect on the pseudogap.

Compressive response of nickel-rich NiTiHf high-temperature shape memory single crystals along the [111] orientation

2011 ◽  
Vol 65 (7) ◽  
pp. 577-580 ◽  
Author(s):  
H.E. Karaca ◽  
S.M. Saghaian ◽  
B. Basaran ◽  
G.S. Bigelow ◽  
R.D. Noebe ◽  
...  
Keyword(s):  
High Temperature ◽  
Shape Memory ◽  
Single Crystals ◽  
Compressive Response

Orientation relationship between TiC carbides and B2 phase in as-cast and heat-treated NiTi shape memory alloys

2006 ◽  
Vol 438-440 ◽  
pp. 879-882 ◽  
Author(s):  
Zhonghua Zhang ◽  
Jan Frenzel ◽  
Christoph Somsen ◽  
Josef Pesicka ◽  
Klaus Neuking ◽  
...  
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Orientation Relationship ◽  
Heat Treated ◽  
B2 Phase ◽  
Niti Shape Memory Alloys

Orientation dependence of the shape memory properties in aged Ni45.3Ti29.7Hf20Pd5 single crystals

2014 ◽  
Vol 54 ◽  
pp. 60-68 ◽  
Author(s):  
E. Acar ◽  
H.E. Karaca ◽  
H. Tobe ◽  
R.D. Noebe ◽  
Y.I. Chumlyakov
Keyword(s):  
Shape Memory ◽  
Single Crystals ◽  
Orientation Dependence ◽  
Shape Memory Properties

A Comparative Study of Structure Formation in Thermomechanically Treated Ti-Ni and Ti-Nb-(Zr, Ta) SMA

2012 ◽  
Vol 706-709 ◽  
pp. 1931-1936 ◽  
Author(s):  
Sergey Prokoshkin ◽  
Vladimir Brailovski ◽  
Karine Inaekyan ◽  
Andrey Korotitskiy ◽  
Sergey Dubinskiy ◽  
...  
Keyword(s):  
Cold Rolling ◽  
Comparative Study ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Structure Formation ◽  
Thermomechanical Treatment ◽  
Functional Properties ◽  
Nanocrystalline Structure ◽  
Technological Factors

The processes of structure formation in Ti-Ni and in Ti-Nb-Zr, Ti-Nb-Ta shape memory alloys (SMA) under thermomechanical treatment (TMT) were studied. The TMT comprised cold rolling with true strains from e=0.25 to 2 and post-deformation annealing. Differences in these processes between two groups of alloys are considered. The main conclusions are as follows: nanostructures created by TMT are useful for radical improvement of the SMA functional properties, and an optimum nanostructure (nanocrystalline structure, nanosubgrained structure or theirmixture) should be selected by taking into account other structural and technological factors.

Effects of aging on the shape memory behavior of Ni-rich Ni50.3Ti29.7Hf20 single crystals

2015 ◽  
Vol 87 ◽  
pp. 128-141 ◽  
Author(s):  
S.M. Saghaian ◽  
H.E. Karaca ◽  
H. Tobe ◽  
M. Souri ◽  
R. Noebe ◽  
...  
Keyword(s):  
Shape Memory ◽  
Single Crystals ◽  
Shape Memory Behavior ◽  
Effects Of Aging

scholarly journals Temperature Dependence of Pseudoelasticity and Shape Memory Effect in Fe3Ga Single Crystals with D03 Structure

2008 ◽  
Vol 48 (7) ◽  
pp. 1014-1019 ◽  
Author(s):  
Hiroyuki Y. Yasuda ◽  
Kouki Fukushima ◽  
Mitsuhiro Aoki ◽  
Yukichi Umakoshi
Keyword(s):  
Shape Memory ◽  
Temperature Dependence ◽  
Single Crystals ◽  
Shape Memory Effect ◽  
Memory Effect
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