Superplastic Deformation Behavior of Electrodeposited Nickel Matrix Nanocomposite

2007 ◽  
Vol 551-552 ◽  
pp. 521-526
Author(s):  
K.C. Chan ◽  
C.L. Wang ◽  
Guo Feng Wang ◽  
Kai Feng Zhang
Keyword(s):  
Deformation Behavior ◽  
Superplastic Deformation ◽  
Deformation Behaviour ◽  
Deformation Mechanisms ◽  
Nickel Matrix ◽  
Optimum Temperature ◽  
Before And After ◽  
Electrodeposited Nickel ◽  
Experimental Findings ◽  
Matrix Nanocomposite

In this paper, the superplastic deformation behaviour of a pulse electrodeposited Ni-SiC nanocomposite was further studied at temperatures ranging from 330 to 530oC. It was found that optimum temperature of the composite was 450oC, and the shape of its flow stress vs strain rate curves is similar to that of conventional superplastic materials. The microstructures of the composite before and after deformation were examined using SEM and TEM. Dislocations and deformation twinning were observed in the deformed samples, and there was significant grain growth during deformation. The deformation mechanisms were also discussed in the paper based on the experimental findings.

scholarly journals Deformation behavior of textile electrodes during compression

2020 ◽  
Vol 207 ◽  
pp. 03002
Author(s):  
Diana Germanova-Krasteva ◽  
Elena Nikolova
Keyword(s):  
Medical Practice ◽  
Human Body ◽  
Deformation Behavior ◽  
Deformation Behaviour ◽  
Deformation Curves ◽  
Tight Contact ◽  
Textile Electrodes ◽  
Wide Range ◽  
Before And After ◽  
Pressure Changes

Textile electrodes are increasingly used to measure biomedical signals (ECG, EMG, EEG) needed for diagnostic activities in medical practice. Tight contact between the electrode and the human body is required to obtain a quality biopotential signal. Pressure is applied to the electrode to secure it. The aim of the work is to study the deformations caused by the applied efforts. The deformation curves of two models of textile electrodes were determined, which have been examined before and after a certain number of washing cycles (10 and 50), in a wide range of pressure changes on the electrodes - from 0.1 to 17 kPa. Analyses of the deformation behaviour of the electrodes and its changes after washing are made. Characteristic zones in the deformation curves are defined; reasons for their formation and change after washing are commented.

scholarly journals Low-Temperature Superplasticity and Deformation Mechanism of Ti-6Al-4V Alloy

Materials ◽  
2018 ◽  
Vol 11 (7) ◽  
pp. 1212 ◽  
Author(s):  
Ge Zhou ◽  
Lijia Chen ◽  
Lirong Liu ◽  
Haijian Liu ◽  
Heli Peng ◽  
...  
Keyword(s):  
Low Temperature ◽  
Deformation Mechanism ◽  
Superplastic Deformation ◽  
Rate Sensitivity ◽  
Deformation Mechanisms ◽  
Temperature Deformation ◽  
Deformation Activation Energy ◽  
Before And After ◽  
Different Temperatures ◽  
Elongation To Failure

The low-temperature superplastic tensile behavior and the deformation mechanisms of Ti-6Al-4V alloy are investigated in this paper. Through the experiments carried out, elongation to failure (δ) is calculated and a set of values are derived that subsequently includes the strain rate sensitivity exponent (m), deformation activation energy (Q) at low-temperature superplastic deformation, and the variation of δ, m and Q at different strain rates and temperatures. Microstructures are observed before and after superplastic deformation. The deformation mechanism maps incorporating the density of dislocations inside grains at temperatures of 973 and 1123 K are drawn respectively. By applying the elevated temperature deformation mechanism maps based on Burgers vector compensated grain size and modulus compensated stress, the dislocation quantities and low-temperature superplastic deformation mechanisms of Ti-6Al-4V alloy at different temperatures within appropriate processing regime are elucidated.

Superplastic Deformation Behavior of the Y-TZP Tested in Torsion

2001 ◽  
Vol 357-359 ◽  
pp. 559-564
Author(s):  
Yoshinobu Motohashi ◽  
S. Sanada ◽  
Takaaki Sakuma
Keyword(s):  
Deformation Behavior ◽  
Superplastic Deformation

Effect of Grain Size on Deformation Twinning Behavior of Ti6Al4V Alloy

2015 ◽  
Vol 830-831 ◽  
pp. 337-340
Author(s):  
Ashish Kumar Saxena ◽  
Manikanta Anupoju ◽  
Asim Tewari ◽  
Prita Pant
Keyword(s):  
Plastic Deformation ◽  
Grain Size ◽  
Strain Rate ◽  
Deformation Behavior ◽  
Deformation Behaviour ◽  
Air Cooling ◽  
Specific Strength ◽  
Aerospace Applications ◽  
Β Phase ◽  
Plastic Deformation Behavior

An understanding of the plastic deformation behavior of Ti6Al4V (Ti64) is of great interest because it is used in aerospace applications due to its high specific strength. In addition, Ti alloys have limited slip systems due to hexagonal crystal structure; hence twinning plays an important role in plastic deformation. The present work focuses upon the grain size effect on plastic deformation behaviour of Ti64. Various microstructures with different grain size were developed via annealing of Ti64 alloy in α-β phase regime (825°C and 850°C) for 4 hours followed by air cooling. The deformation behavior of these samples was investigated at various deformation temperature and strain rate conditions. Detailed microstructure studies showed that (i) smaller grains undergoes twinning only at low temperature and high strain rate, (ii) large grain samples undergo twinning at all temperatures & strain rates, though the extent of twinning varied.

Investigations on Microstructure Evolution and Deformation Behavior of Aged and Ultrafine Grained Al-Zn-Mg Alloy Subjected to Severe Plastic Deformation

2010 ◽  
Vol 667-669 ◽  
pp. 253-258
Author(s):  
Wei Ping Hu ◽  
Si Yuan Zhang ◽  
Xiao Yu He ◽  
Zhen Yang Liu ◽  
Rolf Berghammer ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Plastic Deformation ◽  
Grain Size ◽  
Severe Plastic Deformation ◽  
Microstructure Evolution ◽  
Deformation Behavior ◽  
Deformation Mechanisms ◽  
Mg Alloy ◽  
Ultrafine Grained

An aged Al-5Zn-1.6Mg alloy with fine η' precipitates was grain refined to ~100 nm grain size by severe plastic deformation (SPD). Microstructure evolution during SPD and mechanical behaviour after SPD of the alloy were characterized by electron microscopy and tensile, compression as well as nanoindentation tests. The influence of η' precipitates on microstructure and mechanical properties of ultrafine grained Al-Zn-Mg alloy is discussed with respect to their effect on dislocation configurations and deformation mechanisms during processing of the alloy.

Superplastic deformation behaviour of aluminium containing brasses

2016 ◽  
Vol 674 ◽  
pp. 135-143 ◽  
Author(s):  
O.A. Yakovtseva ◽  
A.V. Mikhaylovskaya ◽  
A.V. Pozdniakov ◽  
A.D. Kotov ◽  
V.K. Portnoy
Keyword(s):  
Superplastic Deformation ◽  
Deformation Behaviour

scholarly journals Effect of Reaction Temperature on Adsorption Efficiency using Computer Mathematical Statistics Visible Spectorphotometer

2021 ◽  
Vol 2083 (3) ◽  
pp. 032072
Author(s):  
Yongli Zhang ◽  
Ruiting Li
Keyword(s):  
Reaction Temperature ◽  
Metal Ion ◽  
Adsorption Rate ◽  
Ion Concentration ◽  
Adsorption Efficiency ◽  
Optimum Temperature ◽  
Absorption Effect ◽  
Before And After ◽  
Measurement Experiment ◽  
Optimal Reaction

Abstract In this paper, waste shrimp shells extracted from the head of the chitosan material; static adsorption experiments manner by wastewater containing Fe(III) added chitosan, vis spectrophotometer absorbance before and after the measurement experiment was obtained by reacting the size of the metal ion concentration, adsorption conditions whereby chitosan Fe(III) and the ability to explore. Experiments show that. In the case where the reaction temperature is less than 55°C, chitosan has adsorption rate Fe(III) smaller rise, the optimum temperature was 55°C, but the effects on the reaction temperature adsorption rate is not large; Adsorption when control time 30 min to 50 min, the absorption effect is increased with increase in the time, to reach the optimal reaction time 50 min.

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