scholarly journals Electrodeposition of Ni-Co Alloys and Their Mechanical Properties by Micro-Vickers Hardness Test

Electrochem ◽  
2020 ◽  
Vol 2 (1) ◽  
pp. 1-9
Author(s):  
Yiming Jiang ◽  
Chun-Yi Chen ◽  
Tso-Fu Mark Chang ◽  
Xun Luo ◽  
Daisuke Yamane ◽  
...  
Keyword(s):  
Solid Solution ◽  
Grain Size ◽  
Hardness Test ◽  
Strengthening Effect ◽  
Solid Solution Strengthening ◽  
Grain Sizes ◽  
Solution Strengthening ◽  
Co Alloys ◽  
Granular Morphology ◽  
Sulfamate Bath

Nanocrystalline Ni-Co alloy deposits with grain sizes less than 30 nm were produced by electrodeposition with a direct current in a sulfamate bath. Surfaces of the Ni-Co alloy deposits showed granular morphology. The size of the granular particles and the Co content decreased when a lower current density was applied. Addition of NiBr2 and a surface brightener (NSF-E) into the bath resulted in the grain refinement effect and an increase of Co content in the deposit. The grain size reached roughly 14 nm and 60 at.% of Co content in Ni-Co alloys electrodeposited with the bath containing the two additives. Ni-Co alloys obtained in this study showed higher microhardnesses than those of pure Ni and Co deposits prepared under the same condition, which revealed the solid solution strengthening effect. With a decrease in the grain size, the microhardness further increased, and this trend followed the Hall–Petch relationship well. The maximum microhardness value of 862.2 Hv was obtained owing to both the grain boundary and solid solution strengthening effects.

Mechanical Properties of Ga1–xInxAs

1985 ◽  
Vol 53 ◽  
Author(s):  
S. Guruswamy ◽  
J.P. Hirth ◽  
K.T. Faber
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
High Temperature ◽  
Strengthening Effect ◽  
Plateau Stress ◽  
Solid Solution Strengthening ◽  
Stress Region ◽  
Solution Strengthening ◽  
Concentration Levels ◽  
Undoped Gaas

ABSTRACTSubstantial solid solution strengthening of GaAs by In acting as InAs4 units has recently been predicted. This strengthening could account for the reduction of dislocation density in GaAs single crystals grown from the melt. High temperature hardness measurements up to 700ºC have been carried out on (100) GaAs and Ga0.9975 In0.0025 As wafers. Results show a significant strengthening effect in In—doped GaAs even at concentration levels of about 0.2 wt%. A temperature independent flow stress region is observed for both these alloys. The In—doped GaAs shows ahigher plateau stress level compared to the undoped GaAs. The results are consistent with the solid solution strengthening model.

Deformation, Strengthening, and Fracture of Ferritic Microstructures

2015 ◽  
pp. 213-232
Keyword(s):  
Solid Solution ◽  
Grain Size ◽  
Tensile Deformation ◽  
Carbon Steels ◽  
Strain Response ◽  
Deformation Strain ◽  
Solid Solution Strengthening ◽  
Brittle Transition ◽  
Solution Strengthening ◽  
Effects Of Aging

This chapter discusses the stress-strain response of ferritic microstructures and its influence on tensile deformation, strain hardening, and ductile fracture of carbon steels. It describes the ductile-to-brittle transition that occurs in bcc ferrite, the effects of aging and grain size on strength and toughness, continuous and discontinuous yielding behaviors, and dispersion and solid-solution strengthening processes.

Solid-Solution Strengthening Effect of Vanadium Addition to Iron-Modified L12 Titanium Trialuminides

1994 ◽  
Vol 364 ◽  
Author(s):  
Tohru Takahashi ◽  
Tadashi Hasegawa
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Intermetallic Compounds ◽  
Argon Atmosphere ◽  
Strengthening Effect ◽  
Cubic Symmetry ◽  
Solid Solution Strengthening ◽  
Arc Melting ◽  
Solution Strengthening ◽  
Cubic Structure

AbstractTwo types of aluminum–titanium–iron–vanadium ( Al–Ti–Fe–V ) quarternary intermetallic compounds have been prepared by arc melting under argon atmosphere. Their compositions were nominally Al66Ti25Fe6V3 and Al66Ti25Fe3V6. These alloys are based on the iron–modified titanium trialuminide with L12 cubic structure. Vanadium addition up to about 6 mol% did not destroy the cubic symmetry, and L12 solid solution compounds were produced in these two Al–Ti–Fe–V quarternary alloys. Microstructure and mechanical properties have been investigated. It has been demonstrated that vanadium addition to iron–modified L12 titanium trialuminides can enhance their strength.

Effect of grain size on yield strength of Ni3Al and other alloys

1988 ◽  
Vol 3 (4) ◽  
pp. 665-674 ◽  
Author(s):  
M. Takeyama ◽  
C. T. Liu
Keyword(s):  
Grain Size ◽  
Careful Consideration ◽  
Strengthening Effect ◽  
Preparation Methods ◽  
Petch Relation ◽  
Solid Solution Strengthening ◽  
Boron Doped ◽  
Solution Strengthening ◽  
Lüders Band ◽  
Major Emphasis

This paper analyzes the effect of grain size on yield stress of ordered Ni3Al and Zr3Al, and mild steels that show Lüders band propagation after yielding, using the Hall-Petch relation, σy = σ0 + kyd−½, and the new relation proposed by Schulson et al., σy = σ0 + kd −(p − 1)/2 [Schulson et al., Acta Metall. 33, 1587 (1985)]. The major emphasis is placed on the analysis of Ni3Al data obtained from published and new results, with a careful consideration of the alloy stoichiometry effect. All data, except for binary stoichiometric Ni3Al prepared by powder extrusion, fit the Hall-Petch relation, whereas the data from boron-doped Ni3Al and mild steels do not follow the Schulson relation. However, no conclusion can be made simply from the curve fitting using either relation. The results are also discussed in terms of Lüders strain and alloy preparation methods. On the basis of the Hall-Petch analysis, the small slope ky is obtained only for hypostoichiometric Ni3Al with boron, which would be related to a stronger segregation of boron in nickel-rich Ni3Al. In addition, the potency for the solid solution strengthening effect of boron is found to be much higher for stoichiometric Ni3Al than for hypostoichiometric alloys.

scholarly journals Temperature Dependent Solid Solution Strengthening in the High Entropy Alloy CrMnFeCoNi in Single Crystalline State

Metals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1412
Author(s):  
Christian Gadelmeier ◽  
Sebastian Haas ◽  
Tim Lienig ◽  
Anna Manzoni ◽  
Michael Feuerbacher ◽  
...  
Keyword(s):  
Solid Solution ◽  
Pure Nickel ◽  
High Entropy Alloy ◽  
Single Element ◽  
Strengthening Effect ◽  
Face Centered Cubic ◽  
Single Crystalline ◽  
High Entropy ◽  
Solid Solution Strengthening ◽  
Solution Strengthening

The main difference between high entropy alloys and conventional alloys is the solid solution strengthening effect, which shifts from a single element to a multi-element matrix. Little is known about the effectiveness of this effect at high temperatures. Face-centered cubic, equiatomic, and single crystalline high entropy alloy CrMnFeCoNi was pre-alloyed by arc-melting and cast as a single crystal using the Bridgman process. Mechanical characterization by creep testing were performed at temperatures of 700, 980, 1100, and 1200 °C at different loads under vacuum and compared to single-crystalline pure nickel. The results allow a direct assessment of the influence of the chemical composition without any disturbance by grain boundary sliding or diffusion. The results indicate different behaviors of single crystalline pure nickel and CrMnFeCoNi. At 700 °C CrMnFeCoNi is more creep-resistant than Ni, but at 980 °C both alloys show a nearly similar creep strength. Above 980 °C the creep behavior is identical and the solid solution strengthening effect of the CrMnFeCoNi alloy disappears.

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