Martensitic transformation and elastocaloric effect of Co51.5+V31.5-Ga17 (x = 0.1, 0.2, 0.3) alloys

2021 ◽  
Vol 139 ◽  
pp. 107348
Author(s):  
Jing He ◽  
Zhiyang Wei ◽  
Wen Sun ◽  
Xiang Lu ◽  
Shengcan Ma ◽  
...  
Keyword(s):  
Martensitic Transformation ◽  
Elastocaloric Effect

Elastocaloric effect dependency in [001]-oriented titanium nickelide single crystals, containing nanosized Ti3Ni4 particles

2021 ◽  
pp. 114-119
Author(s):  
N.Yu. Surikov ◽  
◽  
E.Yu. Panchenko ◽  
Yu.I. Chumlyakov ◽  
◽  
...  
Keyword(s):  
Martensitic Transformation ◽  
Temperature Dependence ◽  
Single Crystals ◽  
Mechanical Energy ◽  
Coefficient Of Performance ◽  
Dissipated Energy ◽  
Working Cycle ◽  
Elastocaloric Effect ◽  
Adiabatic Cooling ◽  
Experimental Values

The temperature dependence of the elastocaloric effect were studied and experimental values of the adiabatic cooling Δ T ad in loading/unloading cycles up to 13.3 K in quenched and 16.4 K in aged at 573 K, 1 h Ni50.6Ti49.4 single crystals were obtained. In aged crystals, a specific feature of the elastocaloric effect temperature dependence (an increase in Δ T ad above the temperature T R = 273 K) was found, which is associated with a change in the sequence of stress-induced martensitic transformation from R-B19' to B2-B19'. The factors (the value of the dissipated energy in the working cycle, the strain hardening coefficient during the stress-induced martensitic transformation), that affect the elastocaloric effect, are discussed. It is shown, that aged single crystals have a high coefficient of performance value up to 31, which characterizes the efficiency of converting mechanical energy into thermal energy, and are promising for solid-state cooling technologies.

Martensitic transformation and elastocaloric effect of Ti–Ni–Cu–Al microwire

Materialia ◽  
2020 ◽  
Vol 9 ◽  
pp. 100547 ◽  
Author(s):  
Fei Xiao ◽  
Zhenxing Li ◽  
Hong Chen ◽  
Zhu Li ◽  
Kai Huang ◽  
...  
Keyword(s):  
Martensitic Transformation ◽  
Elastocaloric Effect

Correlation between microstructure and martensitic transformation, mechanical properties and elastocaloric effect in Ni–Mn-based alloys

2019 ◽  
Vol 113 ◽  
pp. 106579 ◽  
Author(s):  
Xiao-Ming Huang ◽  
Lu-Da Wang ◽  
Hao-Xuan Liu ◽  
Hai-Le Yan ◽  
Nan Jia ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Martensitic Transformation ◽  
Elastocaloric Effect

scholarly journals Large elastic strain and elastocaloric effect caused by lattice softening in an iron-palladium alloy

2016 ◽  
Vol 374 (2074) ◽  
pp. 20150312 ◽  
Author(s):  
Tomoyuki Kakeshita ◽  
Fei Xiao ◽  
Takashi Fukuda
Keyword(s):  
Phase Transitions ◽  
Martensitic Transformation ◽  
Elastic Constant ◽  
Elastic Strain ◽  
Palladium Alloy ◽  
First Order ◽  
Elastocaloric Effect ◽  
Large Elastic Strain ◽  
Cubic Structure ◽  
Lattice Softening

A Fe-31.2Pd (at.%) alloy exhibits a weak first-order martensitic transformation from a cubic structure to a tetragonal structure near 230 K. This transformation is associated with significant softening of elastic constant C ′. Because of the softening, the alloy shows a large elastic strain of more than 6% in the [001] direction. In addition, the alloy has a critical point and shows a high elastocaloric effect in a wide temperature range for both the parent and the martensite phases. This article is part of the themed issue ‘Taking the temperature of phase transitions in cool materials’.

In situ observation of the martensitic transformation in (Mg,Y)-PSZ

1986 ◽  
Vol 44 ◽  
pp. 500-501
Author(s):  
R-R. Lee
Keyword(s):  
Martensitic Transformation ◽  
High Strength ◽  
Nucleation And Growth ◽  
In Situ Observation ◽  
Considerable Potential ◽  
Transmission Electron ◽  
Structural Applications ◽  
Applied Stresses ◽  
Kinetics Of

Partially-stabilized ZrO2 (PSZ) ceramics have considerable potential for advanced structural applications because of their high strength and toughness. These properties derive from small tetragonal ZrO2 (t-ZrO2) precipitates in a cubic (c) ZrO2 matrix, which transform martensitically to monoclinic (m) symmetry under applied stresses. The kinetics of the martensitic transformation is believed to be nucleation controlled and the nucleation is always stress induced. In situ observation of the martensitic transformation using transmission electron microscopy provides considerable information about the nucleation and growth aspects of the transformation.

Evidence for ordered Fe3Ni

1987 ◽  
Vol 45 ◽  
pp. 216-217
Author(s):  
K.B. Reuter ◽  
D.B. Williams ◽  
J.I. Goldstein
Keyword(s):  
Experimental Data ◽  
Martensitic Transformation ◽  
Electron Diffraction ◽  
Room Temperature ◽  
Direct Evidence ◽  
Transformation Product ◽  
Iron Meteorites ◽  
X Ray ◽  
Ni Content ◽  
Temperature Transformation

In the Fe-Ni system, although ordered FeNi and ordered Ni3Fe are experimentally well established, direct evidence for ordered Fe3Ni is unconvincing. Little experimental data for Fe3Ni exists because diffusion is sluggish at temperatures below 400°C and because alloys containing less than 29 wt% Ni undergo a martensitic transformation at room temperature. Fe-Ni phases in iron meteorites were examined in this study because iron meteorites have cooled at slow rates of about 10°C/106 years, allowing phase transformations below 400°C to occur. One low temperature transformation product, called clear taenite 2 (CT2), was of particular interest because it contains less than 30 wtZ Ni and is not martensitic. Because CT2 is only a few microns in size, the structure and Ni content were determined through electron diffraction and x-ray microanalysis. A Philips EM400T operated at 120 kV, equipped with a Tracor Northern 2000 multichannel analyzer, was used.

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