A Unique Two-Stage Strength-Ductility Match in Low Solid-Solution Hardening Ni-Cr Alloys: Decisive Role of Short Range Ordering

2019 ◽  
Author(s):  
Y.J. Zhang ◽  
D. Han ◽  
Xiao Wu Li
Keyword(s):  
Solid Solution ◽  
Short Range ◽  
Decisive Role ◽  
Solid Solution Hardening ◽  
Two Stage ◽  
Solution Hardening ◽  
Short Range Ordering

Short-Range Order and Solid Solution Hardening

1991 ◽  
Vol 168 (2) ◽  
pp. 437-444 ◽  
Author(s):  
M. S. Blanter ◽  
M. Ya. Fradkov
Keyword(s):  
Solid Solution ◽  
Short Range ◽  
Short Range Order ◽  
Range Order ◽  
Solid Solution Hardening ◽  
Solution Hardening

scholarly journals Mechanisms of Solid-Solution Hardening of Single-Phase Cu-Al and Cu-Mn Alloys with a Mesh Dislocation Substructure

2021 ◽  
pp. 59-65
Author(s):  
L.I. Trishkina ◽  
T.V. Cherkasova ◽  
A.A. Klopotov ◽  
A.I. Potekaev
Keyword(s):  
Solid Solution ◽  
Dislocation Density ◽  
Solid Solution Hardening ◽  
Relative Role ◽  
Solution Hardening ◽  
Defective Structure ◽  
Grain Sizes ◽  
Electron Microscopes ◽  
Scalar Dislocation Density

The dislocation structure and dislocation accumulation during deformation of polycrystalline FCC solid solutions of Cu-Al and Cu-Mn systems are studied by transmission diffraction electron microscopy. The Al content in Cu-Al alloys varies from 0.5 to 14 at.%. The Mn content in Cu-Mn alloys varies in the range of 0.4 ÷ 25 at.%. Alloys with a grain size in the range of 20 ÷ 240 µm are studied. The alloy samples are deformed by stretching at a rate of 2×10-2c-1 to failure at 293 K. The structure of samples deformed to various degrees of deformation is studied on foils using electron microscopes at an accelerating voltage of 125 kV. For each degree of deformation, the scalar dislocation density and its components are measured: statistically stored dislocations ρS and geometrically necessary dislocations ρG and some other parameters of the defective structure. The mechanisms and their contributions due to mesh and mesh-mesh dislocation substructures (DSS) are determined using the example of substructural and solid-solution hardening in polycrystalline Cu-Al and Cu-Mn alloys. The relative role of various mechanisms in the formation of the resistance to deformation of alloys at different grain sizes is determined. The role of the packaging defect energy on the value of solid-solution hardening for different grain sizes is revealed. The average scalar dislocation density is considered and determined along with its components: statistically stored dislocations ρS and geometrically necessary dislocations ρG. The dependences of the flow stress on the square root of the densities of geometrically necessary dislocations and the densities of statistically stored dislocations are found.

scholarly journals Solid Solution Strengthening of Mo, Re, Ta and W in Ni during High-Temperature Creep

Metals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1909
Author(s):  
Lukas Haußmann ◽  
Hamad ur ur Rehman ◽  
Dorothea Matschkal ◽  
Mathias Göken ◽  
Steffen Neumeier
Keyword(s):  
Solid Solution ◽  
Low Temperatures ◽  
Mechanical Tests ◽  
Alloying Elements ◽  
Solid Solution Hardening ◽  
High Temperature Creep ◽  
Solution Hardening ◽  
Solid Solution Strengthening ◽  
Solution Strengthening

Solid solution strengthening of the unordered γ matrix phase by alloying elements is of great importance during creep of Ni-based superalloys, particularly at high temperatures above 1000 °C. To study the role of different potent solutes, we have conducted creep experiments on binary Ni-2X alloys (X = Mo, Re, Ta, W) at 1000 °C, 1050 °C, and 1100 °C at a constant stress of 20 MPa. Compared to mechanical tests below 800 °C, where the size of the elements mostly determines the solid solution hardening contribution, the strengthening contribution of the different alloying elements above 1000 °C directly correlates with their diffusivity. Therefore, elements such as Ta that lead to strong solid solution hardening at low temperatures become less effective at higher temperatures and are exceeded by slower diffusing elements, such as Re.

scholarly journals Solid Solution Hardening of Nickel —Role of Transition Metal and B-subgroup Solutes—

1986 ◽  
Vol 27 (9) ◽  
pp. 656-664 ◽  
Author(s):  
Yoshinao Mishima ◽  
Shouichi Ochiai ◽  
Noboru Hamao ◽  
Masayoshi Yodogawa ◽  
Tomoo Suzuki
Keyword(s):  
Solid Solution ◽  
Transition Metal ◽  
Solid Solution Hardening ◽  
Solution Hardening

A Tem Study of Slip Systems in MoSi2/WSi2 Alloys

1991 ◽  
Vol 49 ◽  
pp. 942-943
Author(s):  
Stuart A. Maloy
Keyword(s):  
Solid Solution ◽  
Solid Solution Hardening ◽  
Slip Systems ◽  
High Melting ◽  
Group 14 ◽  
Solution Hardening ◽  
Brittle To Ductile Transition ◽  
High Melting Temperature ◽  
Tetragonal Unit Cell ◽  
Structural Applications

MoSi2 has recently been investigated as a potential material for high temperature structural applications. It has excellent oxidation resistance up to 1700°C, a high melting temperature, 2030°C, and a brittle-to-ductile transition temperature at 900-1000°C. WSi2 is isomorphous with MoSi2 and has a body-centered tetragonal unit cell of the space group 14/mmm. The lattice parameters are a=3.20 Å and c=7.84 Å for MoSi2 and a=3.21 Å and c=7.88 Å for WSi2. Therefore, WSi2 was added to MoSi2 to improve its strength via solid solution hardening. The purpose of this study was to investigate the slip systems in polycrystalline MoSi2/WSi2 alloys.

Emulation of short-range ordering within the Compound Energy Formalism: Application to the calcite-magnesite solid solution

Calphad ◽  
2019 ◽  
Vol 64 ◽  
pp. 115-125 ◽  
Author(s):  
Xin Liu ◽  
Victor L. Vinograd ◽  
Sergii Nichenko ◽  
Dmitrii A. Kulik ◽  
Xiancai Lu ◽  
...  
Keyword(s):  
Solid Solution ◽  
Short Range ◽  
Compound Energy Formalism ◽  
Short Range Ordering
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