Electrodeposited Nanocrystalline Nickel Parts

2012 ◽  
Vol 201-202 ◽  
pp. 1102-1105
Author(s):  
Jin Song Chen ◽  
Jian Ming Yang
Keyword(s):  
Rapid Prototyping ◽  
Dimensional Accuracy ◽  
Processing Parameters ◽  
Nanocrystalline Nickel ◽  
Fine Grained ◽  
Average Grain Size ◽  
Machined Parts ◽  
Jet Electrodeposition ◽  
Fine Grained Structure ◽  
Metallic Parts

The principles of jet electrodeposition orientated by rapid prototyping were introduced , The nanocrystalline nickel parts with simple shape were fabricated using jet electrodeposition oriented by rapid prototyping. The microstructure and phase transformation of nanocrystalline nickel were observed under the scanning microscope and X-ray diffraction instrument . The results show that the successful fabrication of metallic parts demonstrates the potential of the jet electrodeposition process for prototyping technology . The jet electrodeposition can greatly enhance the limited current density, fine crystalline particles and improve deposition quality. The nickel parts prepared by jet electrodeposition own a fine-grained structure( average grain size 25.6nm) with a smooth surface and high dimensional accuracy under the optimum processing parameters..The dimensional accuracy as well as the surface quality of metallic parts and tools manufactured using jet electrodeposition techniques still lag far behind those of conventionally machined parts.

A Study on Nanocrystalline Nickel Parts Prepared by Jet Electrodeposition

2010 ◽  
Vol 37-38 ◽  
pp. 64-67
Author(s):  
Jin Song Chen ◽  
Yin Hui Huang ◽  
Bin Qiao ◽  
Jian Ming Yang ◽  
Yi Qiang He
Keyword(s):  
Dimensional Accuracy ◽  
Processing Parameters ◽  
X Ray Diffraction ◽  
Scanning Microscope ◽  
Nanocrystalline Nickel ◽  
X Ray ◽  
Fine Grained ◽  
Average Grain Size ◽  
Jet Electrodeposition ◽  
Fine Grained Structure

The principles of jet electrodeposition orientated by rapid prototyping were introduced. The nanocrystalline nickel parts with simple shape were fabricated using jet electrodeposition. The microstructure and phase transformation of nanocrystalline nickel were observed under the scanning microscope and X-ray diffraction instrument. The results show that the jet electrodeposition can greatly enhance the limited current density, fine crystalline particles and improve deposition quality. The nickel parts prepared by jet electrodeposition own a fine-grained structure (average grain size 25.6nm) with a smooth surface and high dimensional accuracy under the optimum processing parameters.

Microstructure and Performance of Nanocrystalline Nickel Parts

2011 ◽  
Vol 287-290 ◽  
pp. 420-423
Author(s):  
Jin Song Chen
Keyword(s):  
Dimensional Accuracy ◽  
Processing Parameters ◽  
X Ray Diffraction ◽  
Nanocrystalline Nickel ◽  
Fine Grained ◽  
Rapid Fabrication ◽  
Jet Electrodeposition ◽  
Fine Grained Structure ◽  
And Performance ◽  
Microstructure And Performance

Jet electrodeposition orientated by rapid fabrication were introduced , The nanocrystalline nickel parts were fabricated using jet electrodeposition . The microstructure and phase transformation of nanocrystalline nickel were observed under the scanning microscope and X-ray diffraction instrument . The results show that the jet electrodeposition can greatly enhance the limited current density, fine crystalline particles and improve deposition quality. The nickel parts prepared by jet electrodeposition own a fine-grained structure with a smooth surface and high dimensional accuracy under the optimum processing parameters.

scholarly journals STRUCTURE AND PROPERTIES OF AZ31 MAGNESIUM ALLOY AFTER COMBINATION OF HOT EXTRUSION AND ECAP

2017 ◽  
Vol 23 (3) ◽  
pp. 222 ◽  
Author(s):  
Ondřej Hilšer ◽  
Stanislav Rusz ◽  
Wojciech Maziarz ◽  
Jan Dutkiewicz ◽  
Tomasz Tański ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Magnesium Alloy ◽  
Hot Extrusion ◽  
Az31 Magnesium Alloy ◽  
Initial State ◽  
Fine Grained ◽  
Angular Pressing ◽  
Ecap Process ◽  
Average Grain Size ◽  
Fine Grained Structure

<p>Equal channel angular pressing (ECAP) method was used for achieving very fine-grained structure and increased mechanical properties of AZ31 magnesium alloy. The experiments were focused on the, in the initial state, hot extruded alloy. ECAP process was realized at the temperature 250°C and following route Bc. It was found that combination of hot extrusion and ECAP leads to producing of material with significantly fine-grained structure and improves mechanical properties. Alloy structure after the fourth pass of ECAP tool with helix matrix 30° shows a fine-grained structure with average grain size of 2 µm to 3 µm and high disorientation between the grains. More experimental results are discussed in this article.</p>

scholarly journals Microstructure features of the BST/(Mg, Ln)-ceramic

2021 ◽  
pp. 2160005
Author(s):  
K. P. Andryushin ◽  
A. V. Nagaenko ◽  
S. V. Khasbulatov ◽  
L. A. Shilkina ◽  
E. V. Glazunova ◽  
...  
Keyword(s):  
Solid Solutions ◽  
Solid Phase Synthesis ◽  
Solid Phase ◽  
Functional Materials ◽  
Ceramic Technology ◽  
Phase Synthesis ◽  
Fine Grained ◽  
Average Grain Size ◽  
Crystallite Sizes ◽  
Fine Grained Structure

Solid solutions of the composition Ba[Formula: see text](Mg, Ln)[Formula: see text]Sr[Formula: see text]TiO3 ([Formula: see text] = 0.01; 0.025; 0.04; [Formula: see text] = 0.20; 0.50; 0.80; Ln = La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tu, Yb) were prepared by two-stage solid-phase synthesis followed by sintering using conventional ceramic technology. The influence of rare-earth elements on the microstructure of the prepared ceramic samples was investigated. It was found that regardless of the type of modifiers introduced, the grain landscape of the studied solid solutions with different amounts of SrTiO3 is refined (in the initial system, the average grain size, [Formula: see text], at [Formula: see text] = 0.20 is 6 [Formula: see text]m; at [Formula: see text] = 0.50 is 4 [Formula: see text]m; at [Formula: see text] = 0.80 is 18 [Formula: see text]m) to crystallite sizes not exceeding (2–3) [Formula: see text]m, and compacted. The using of mechanical activation procedures leads to an even greater decrease in the size and an increase in the density of ceramics. The increasing in the concentration of modifiers in each group (within the considered range of dopant variation) against the background of such a fine-grained structure has little effect on the dynamics of changes in [Formula: see text]. It is concluded that it is advisable to use the data obtained in the development of functional materials based on BST/(Mg, Ln) and devices with the participation of these compositions.

scholarly journals Study of Structure and Mechanical Properties of Fine-Grained Aluminum Alloys Al-0.6wt.%Mg-Zr-Sc with Ratio Zr:Sc = 1.5 Obtained by Cold Drawing

Materials ◽  
2019 ◽  
Vol 12 (2) ◽  
pp. 316 ◽  
Author(s):  
Aleksey Nokhrin ◽  
Iana Shadrina ◽  
Vladimir Chuvil’deev ◽  
Vladimir Kopylov
Keyword(s):  
Thermal Stability ◽  
Cold Deformation ◽  
Annealing Treatment ◽  
Cold Drawing ◽  
Fine Grained ◽  
Prolonged Annealing ◽  
Intermetallic Particles ◽  
Average Grain Size ◽  
Fine Grained Structure ◽  
Thermal Stability Of

The thermal stability of a fine-grained (FG) aluminum wire has been studied in Al-0.6Mg-Zr-Sc alloys with various scandium and zirconium contents. Specimens were obtained by induction casting followed by cold deformation. The FG alloys have been demonstrated to have high thermal stability of the structure and properties due to the annealing pretreatment (320 °C, 2 h, before drawing), which results in deposition of Al3(ScxZr1−x) intermetallic particles. It has been determined that following a prolonged annealing treatment (400 °C, 100 h), the alloys retain a uniform fine-grained structure with an average grain size of 2.4–2.8 μm whereas their microhardness measures 405–440 MPa.

Structural Characterization of FeAl28Cr5 Alloy Deformed in the Hot Torsion Process

2016 ◽  
Vol 246 ◽  
pp. 43-46 ◽  
Author(s):  
Iwona Bednarczyk ◽  
Magdalena Jabłońska
Keyword(s):  
Plastic Deformation ◽  
Grain Size ◽  
Structural Changes ◽  
Al Alloys ◽  
Dynamic Processes ◽  
Fine Grained ◽  
Average Grain Size ◽  
Fine Grained Structure ◽  
Hot Torsion

Current research in the field of iron aluminides are directed towards to understand the structural phenomena occurring during plastic deformation of these alloys. The obtained results of the study and collected informations will be used to determine the description of the structural changes taking place during hot deformation of Fe ̶Al alloys. The article presents the results of the study of the alloy FeAl28Cr5 deformed by hot torsion in temperature range of 800÷1100°C and a strain rate of 0.1 s-1. The analysis of the structure of the alloy FeAl28Cr5 allowed to reveal changes caused by dynamic processes of deformation. The results of torsion tests show the possibility to obtain a fine-grained structure with of parameters of the processes (T=1000°C, 1100°C) and strain of ε=40. After deformation at strain of (ε=40) the structure consists of fine grains with a misorientation angle higher than 15°, and the average grain size diameter D=28.5 micrometers. Deformation at a temperature of T=1000°C and 1100°C is accompanied by superplastic flow effect.

Measurement of the Porosity of Additive-Manufactured Al-Cu Alloy Using X-Ray Computed Tomography

2016 ◽  
Vol 258 ◽  
pp. 448-451 ◽  
Author(s):  
Aneta Zatočilová ◽  
Tomáš Zikmund ◽  
Jozef Kaiser ◽  
David Paloušek ◽  
Daniel Koutný
Keyword(s):  
Computed Tomography ◽  
Additive Manufacturing ◽  
Selective Laser Melting ◽  
Dimensional Accuracy ◽  
Threshold Value ◽  
Processing Parameters ◽  
Laser Melting ◽  
X Ray ◽  
X Ray Computed ◽  
Metallic Parts

The additive manufacturing of metallic parts by means of selective laser melting is an emerging technology, the development of which is currently of great interest. The quality of the parts produced is evaluated mainly in terms of their mechanical properties, dimensional accuracy, and the homogeneity of the material. Because it is virtually impossible to produce parts without any internal porosity using powder-based additive manufacturing processes, measuring the porosity is critically important to optimizing the processing parameters. X-ray computed tomography is currently the only way used to measure the distribution of pores non-destructively and it can also measure the density and dimensional accuracy. Many studies have presented results of porosity measurements made using CT, but no standard methodology for the making of measurements and processing of data currently exists. The choice of parameters used for measurement and processing can have a significant impact on the results. This study focuses on the effect of voxel resolution on the resulting porosity number and discusses the possibilities for determining the threshold value for detecting pores. All the results presented in this study were obtained by analyzing the sample produced by selective laser melting technology from AlCu2Mg1.5Ni alloy.

Microstructure and Properties of Nanostructured Zirconium Processed by High Pressure Torsion

2010 ◽  
Vol 667-669 ◽  
pp. 433-438 ◽  
Author(s):  
Aleksey V. Podolskiy ◽  
Bartlomiej J. Bonarski ◽  
Daria Setman ◽  
Clemens Mangler ◽  
Erhard Schafler ◽  
...  
Keyword(s):  
Grain Size ◽  
High Pressure ◽  
High Pressure Torsion ◽  
Texture Evolution ◽  
Considerable Change ◽  
Prismatic Slip ◽  
Scanning Calorimetry ◽  
Fine Grained ◽  
Average Grain Size ◽  
Fine Grained Structure

Several structural states of nanostructured zirconium were achieved by high pressure torsion (HPT) at pressures of 2 and 4 GPa with and without subsequent low temperature annealing. The nanostructured Zr was studied by X-Ray Diffraction, Transmission Electron Microscopy and Differential Scanning Calorimetry to reveal the microstructure, phase composition and the thermal stability of this material. The fine grained structure being achieved by HPT had an average grain size of 100-200 nm. It was shown that HPT at 4 GPa leads to a phase transformation from α-Zr to ω-Zr, which has been demonstrated to be reversible by annealing at 300 °C without considerable change of the grain size. The evaluation of texture evolution in Zr during HPT exhibits activity of prismatic slip systems. DSC curves confirm the presence of HPT deformation induced lattice defects and the occurrence of the ω-α phase transition in Zr.

Dispersion of the Structure in Al-Based Alloys by Different Methods of Severe Plastic Deformation

2010 ◽  
Vol 667-669 ◽  
pp. 517-521
Author(s):  
I.G. Brodova ◽  
I. Shirinkina ◽  
A. Petrova
Keyword(s):  
Grain Size ◽  
High Pressure Torsion ◽  
Metastable Phase ◽  
X Rays ◽  
Fine Grained ◽  
Angular Pressing ◽  
Average Grain Size ◽  
Dynamic Channel Angular Pressing ◽  
Fine Grained Structure ◽  
Deformation Aging

Structural and phase transformations in V95 (type of A7075) alloy upon high pressure torsion (HPT) up to high strain and upon dynamic channel angular pressing (DCAP) were studied using electron microscopy (TEM, SEM) and x-rays diffraction. It was established that the nanostructure with average grain size of 80-55 nm and hardness value of 2.5 GPa is formed by HPT at strain of e=5.5-6.4. It was shown the hardening metastable phase MgZn2 precipitates from supersaturated α-solid solution during dynamic deformation aging; its quantity grows with increasing of strain. Ultra fine grained structure with high- angle boundaries is formed in V95 alloy after already 2 cycles of DCAP. The average grain size is 200 nm in DCAP samples.

Effect of Intense Plastic Straining and Subsequent Heat Treatment on Mechanical Properties of an Al-Li-Mg-Sc-Zr Alloy

2010 ◽  
Vol 89-91 ◽  
pp. 389-394 ◽  
Author(s):  
Anna Mogucheva ◽  
Rustam Kaibyshev
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Equal Channel Angular Extrusion ◽  
Solution Treatment ◽  
Precipitation Sequence ◽  
Rectangular Shape ◽  
Fine Grained ◽  
Average Grain Size ◽  
Fine Grained Structure ◽  
Zr Alloy

An Al-5.1%Mg-2.1%Li-0.17%Sc-0.08%Zr (in mass%) alloy designated as 1421 Al was subjected to equal channel angular extrusion (ECAE) with rectangular shape of channels up to fixed true strains of ~4 and ~8 at a temperature of 325oC. This processing provided the formation of uniform recrystallized structures with micron scale average grain size. The 1421 Al after ECAE processing and in initial hot extruded condition was subjected to solution treatment followed by oil quenching and subsequent ageing. Fine grained structure evolved under ECAE remains essentially unchanged under solution treatment. However, this structure affects significantly the precipitation sequence during ageing. Relationships between microstructure and service mechanical properties are considered.

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