Effect of Solution Annealing and Low Temperature Ageing on the Microstructures and Superelastic Behaviour of Ti-50.7at.%Ni Alloy

2013 ◽  
Vol 813 ◽  
pp. 72-80
Author(s):  
Esah Hamzah ◽  
Kurnia Hastuti ◽  
Jasmi Hashim ◽  
Chuan Eng Chuah ◽  
Muhammad Adil Khattak
Keyword(s):  
Heat Treatment ◽  
Plastic Deformation ◽  
Low Temperature ◽  
Testing Temperature ◽  
Sample Solution ◽  
Solution Annealing ◽  
Treatment Conditions ◽  
Ni Alloy ◽  
Temperature Ageing ◽  
Higher Temperature

In this study a plate form of Ti-50.7at.%Ni was subjected to solution annealing at 800°C and 900°C for one hour followed by ageing at 300°C and 400°C for 4 hours respectively in order to investigate the effect of solution annealing and low temperature ageing on the microstructures and superelastic behaviour. It was found that the formation of Ti3Ni4 precipitates on the samples aged at 300°C and 400°C influences superelasticity differently. Increasing the testing temperature up to 38°C generally increases the superelasticity of samples for all heat treatment conditions compared to those tested at 22°C, however the sample solution annealed at 900°C give better superelasticity at 22°C due to excessive plastic deformation at higher temperature.

Effect of copper incorporation on phase transformation behavior of electroless nickel–phosphorous coating and its effect on the tribological behavior

2020 ◽  
pp. 146442072098160
Author(s):  
Abhijit Biswas ◽  
Suman Kalyan Das ◽  
Prasanta Sahoo
Keyword(s):  
Heat Treatment ◽  
Phase Transformation ◽  
Tribological Behavior ◽  
Electroless Nickel ◽  
Two Phase ◽  
Microstructural Changes ◽  
Treatment Conditions ◽  
Heat Treated ◽  
Higher Temperature ◽  
Effect Of Copper

The microstructural changes of electroless Ni–P–Cu coating at various heat-treatment conditions are investigated to understand its implications on the tribological behavior of the coating. Coatings are heat-treated at temperatures ranging between 200°C and 800 °C and for 1–4 h duration. Ni–P–Cu coatings exhibit two-phase transformations in the temperature range of 350–450 °C and the resulting microstructural changes are found to significantly affect their thermal stability and tribological attributes. Hardness of the coating doubles when heat-treated at 452 °C, due to the formation of harder Ni3P phase and crystalline NiCu. Better friction and wear performance are also noted upon heat treatment of the coating at the phase transformation regime, particularly at 400 °C. Wear mechanism is characterized by a mixed adhesive cum abrasive wear phenomena. Heat treatment at higher temperature (600 °C and above) and longer duration (4 h) results in grain coarsening phenomenon, which negatively influences the hardness and tribological characteristics of the coating. Besides, diffusion of iron from the ferrous substrate as well as greater oxide formation are noticed when the coating is heat-treated at higher temperatures and for longer durations (4 h).

Effect of Heat Treatment on Microstructure and Magnetic Properties of Strontium Hexaferrite Nanoparticles Prepared in Presence of Non-Ionic Surfactant

2013 ◽  
Vol 202 ◽  
pp. 193-205
Author(s):  
Nital R. Panchal ◽  
Rajshree B. Jotania
Keyword(s):  
Heat Treatment ◽  
Magnetic Properties ◽  
Tween 80 ◽  
Strontium Hexaferrite ◽  
Ionic Surfactant ◽  
Treatment Conditions ◽  
Heat Treated ◽  
Higher Temperature ◽  
Co Precipitation ◽  
Microstructure And Magnetic Properties

SrFe12O19 hexaferrite particles containing polyoxyethelene (20) sorbitan monolate (Tween-80) were synthesized by a chemical co-precipitation technique with a precipitator NH3.H2O. The prepared Sr-M hexaferrite precipitates were heat treated at various temperatures 650 oC, 750 oC, 850 oC, 950oC and 1100oC for 4 hrs in a muffle furnace. The obtained Sr-M powders were characterized by using various instrumental techniques, like FTIR, TGA, XRD, SEM, VSM and Mössbauer spectroscopy. Their physical as well as Magnetic properties were compared. It was observed from XRD results that heat treatment conditions play significant role in the formation of pure SrFe12O19 hexaferrite phase and also in the grain size. The estimated particle size is of the order of nanometer when suitable calcination temperature is applied. SEM micrographs show an increase in crystallite size of the resultant SrFe12O19 hexaferrite particles sintered at higher temperature (1100 oC). Mössbauer spectroscopic measurements were carried out at room temperature. Mössbauer analysis indicates the presence Fe3+ ions in the prepared strontium hexaferrite particles.

Investigation of Midgap Defects in GaAs Induced By Heat-Treatment (EL2), Electron-Irradiation, and Plastic Deformation

1987 ◽  
Vol 104 ◽  
Author(s):  
Toru Haga ◽  
Masashi Suezawa ◽  
Koji Sumino
Keyword(s):  
Heat Treatment ◽  
Plastic Deformation ◽  
Low Temperature ◽  
Electron Irradiation ◽  
Grown Crystal ◽  
Isothermal Annealing ◽  
Rate Equations ◽  
Kinetics Of ◽  
Absorption Measurements ◽  
Chemical Rate

ABSTRACTThermal behavior of midgap defects generated in GaAs by different procedures has been followed by means of optical absorption measurements at low temperature. EL2 centers existing in as-grown crystals or generated by thermal annealing at temperatures lower than about 1000°C, which are characterized by a perfectly quenchable absorption at a wavelength of 1.0 μm, are found to diminish at temperature higher than 1000°C. The generation kinetics of EL2 centers has been traced during isothermal annealing of a crystal in which grown-in EL2 centers have previously been eliminated by annealing at 1200°C. The result of an analysis with the use of simplified chemical rate equations favors the model that an EL2 center is composed of an As antisite and two Ga vacancies. Both quenchable and unquenchable absorptions are associated with the midgap defects induced by plastic deformation or electron -irradiation. Isochronal annealing reveals that such defects are not identical with EL2 centers that are found in an as-grown crystal even if they accompany the quenchable absorption.

Slip Casting Derived α-TCP/HA Biphasic Ceramics

2007 ◽  
Vol 330-332 ◽  
pp. 51-54 ◽  
Author(s):  
Kui Cheng
Keyword(s):  
Heat Treatment ◽  
Calcium Phosphate ◽  
Low Temperature ◽  
Room Temperature ◽  
Slip Casting ◽  
Temperature Treatment ◽  
Microporous Structure ◽  
Temperature Heat ◽  
Higher Temperature ◽  
Temperature Heat Treatment

Biphasic α-tricalcium phosphate/hydroxyapatite (α-TCP/HA) calcium phosphate (BCP) is prepared through a modified slip casting based method: α-TCP powders are dispersed in the HA precursor solutions to form castable slurries, then the slurries are poured into round mold. After curing, the slurries turn into cakes. Room temperature curing leads the cakes to contain α-TCP and HA phases. Higher temperature heat treatment will result in the increase of HA content, while even higher temperature will leads the cakes to be triphasic. Low temperature derived BCP have particular microstructure with HA covers the surface of α-TCP powders, and these powders further agglomerate into large blocks. After higher temperature treatment, β-TCP dominates the cake and microporous structure is resulted.

Effect of Heat Treatment on the Tensile Strength of Glass Fibre Reinforced Polypropylene

2003 ◽  
Vol 11 (5) ◽  
pp. 369-381
Author(s):  
Jeng-Shyong Lin
Keyword(s):  
Heat Treatment ◽  
Tensile Strength ◽  
Glass Fibre ◽  
Fibre Length ◽  
Testing Temperature ◽  
Scanning Calorimetry ◽  
Treatment Conditions ◽  
Heat Treated ◽  
Molded Parts ◽  
Glass Fibre Reinforced

Improvement of the interfacial adhesion by heat treatment of glass fibre reinforced polypropylene composite was studied. Polypropylene blended with glass fibres was injection-molded. The molded parts were heat treated at various temperatures for various times. Characterization of the mechanical properties of the resulting samples was performed including measurement of the critical fibre length, and differential scanning calorimetry. The results show that the critical fibre length increases while the tensile strength decreases with increasing testing temperature. At 25 and 80°C, heat treatment can improve the tensile strength. At or above 120°C, certain treatment conditions cause the tensile strength to drop significantly.

scholarly journals The Instability Criterion for Bicrystal at Nanoscale

Metals ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 986
Author(s):  
Lin Yuan ◽  
Chuanlong Xu ◽  
Jiangwei Zhang ◽  
Debin Shan ◽  
Bin Guo
Keyword(s):  
Plastic Deformation ◽  
Low Temperature ◽  
Tensile Stress ◽  
Thermal Effect ◽  
Thermal Vibration ◽  
Atomistic Simulations ◽  
Instability Criterion ◽  
Minimum Eigenvalue ◽  
Plastic Yield ◽  
Higher Temperature

Atomistic simulations are performed to predict the plastic yield using the instability criterion under thermal effect. The results show the instability criterion is applicable at low temperature (0~100 K) and invalid at a higher temperature (>200 K) due to the influence of thermal vibration. The tensile stress, minimum eigenvalue of matrix A, and atom configurations are compared to investigate the instability criterion in bicrytals. The instability criterion can successfully capture the plastic deformation initiation for bicrystal at 0 K.

THE EFFECT OF HEAT TREATMENT ON LOW TEMPERATURE INTERNAL FRICTION MAXIMA

1958 ◽  
Vol 36 (1) ◽  
pp. 82-87 ◽  
Author(s):  
T. S. Hutchison ◽  
G. J. Hutton
Keyword(s):  
Heat Treatment ◽  
Plastic Deformation ◽  
Melting Point ◽  
Low Temperature ◽  
Internal Friction ◽  
High Purity ◽  
Temperature Relation ◽  
Temperature Range ◽  
High Purity Aluminum

Measurements of the attenuation of sound at a frequency of 5 megacycles have been made over the temperature range 100° to 200 ° K. on polycrystalline high purity aluminum subjected to various thermal and mechanical treatments. With samples annealed at 520 °C. a maximum in the attenuation versus temperature relation had been observed at 155 ° K. This maximum was greatly increased by small amounts of plastic deformation of the order of 1.0 to 1.5%.Aluminum initially annealed for extended periods at temperatures much closer to the melting point shows, however, either no increase in the attenuation maximum at 155 ° K. or, in extreme cases, no maximum in this region at all, after plastic deformation of the same order as before. It is believed that this indicates a dependence of the deformation-induced maximum on the distribution and possibly on the number of dislocations in the metal prior to deformation and on the arrangement of the dislocations after deformation.

scholarly journals Synthesis, structure, magnetic and half-metallic properties of Co2−x Ru x MnSi (x = 0, 0.25, 0.5, 0.75, 1) compounds

IUCrJ ◽  
2020 ◽  
Vol 7 (1) ◽  
pp. 113-120 ◽  
Author(s):  
H. P. Zhang ◽  
W. B. Liu ◽  
X. F. Dai ◽  
X. M. Zhang ◽  
H. Y. Liu ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Low Temperature ◽  
Curie Temperature ◽  
Single Phase ◽  
Metallic Materials ◽  
Heusler Compounds ◽  
Half Metallic ◽  
Half Metals ◽  
Treatment Conditions ◽  
Wide Range

A series of Co2−x Ru x MnSi (x = 0, 0.25, 0.5, 0.75, 1) Heusler compounds were successfully synthesized. The heat-treatment conditions were crucial to make the materials form a single phase with a Heusler structure. With increasing Ru content, the half-metallic gap, lattice parameters and magnetization are continuously adjustable in a wide range. The Co2−x Ru x MnSi (x = 0, 0.25) compounds are rigorous half-metals and show a T 3 dependence of resistance at low temperature. The Co2−x Ru x MnSi (x = 0.5, 0.75, 1) Heusler compounds are the nearly half-metallic materials and show a semiconductive dependence of resistance at low temperature. The experimental magnetization is consistent with that in theory and follows the Slater–Pauling rule. The Curie temperature is higher than 750 K for all Co2−x Ru x MnSi Heusler compounds.

Change in Microstructure by Heat-Treatment and Corresponding Deformation Behavior in Ni3V Single Crystals

2010 ◽  
Vol 638-642 ◽  
pp. 1318-1323 ◽  
Author(s):  
Koji Hagihara ◽  
Mayumi Mori ◽  
Takuya Kishimoto ◽  
Yukichi Umakoshi
Keyword(s):  
Heat Treatment ◽  
Plastic Deformation ◽  
Single Crystals ◽  
Deformation Behavior ◽  
Heat Treatments ◽  
Disorder Transition ◽  
Treatment Conditions ◽  
Plastic Deformation Behavior

D022-Ni3V contains three variants whose [001] c-axes are mutually perpendicular. In addition, due to the order-disorder transition the anti-phase domains (APD) are also introduced under some heat-treatment conditions. In this study, the influence of such microstructures; the size of variants and APDs, on the plastic deformation behavior of Ni3V was investigated by using single crystals, in which the microstructure was variously controlled by heat-treatments.

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