scholarly journals Quantification of Solid Solution Strengthening and Internal Stresses through Creep Testing of Ni-Containing Single Crystals at 980 °C

Metals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1130
Author(s):  
Uwe Glatzel ◽  
Felix Schleifer ◽  
Christian Gadelmeier ◽  
Fabian Krieg ◽  
Moritz Müller ◽  
...  
Keyword(s):  
Solid Solution ◽  
Grain Boundary ◽  
Creep Strength ◽  
Single Phase ◽  
Configurational Entropy ◽  
Strengthening Mechanisms ◽  
Two Phase ◽  
Solid Solution Strengthening ◽  
The Matrix ◽  
Solution Strengthening

Various alloy compositions were cast as single crystals in a Bridgman vacuum induction furnace and creep tested at 980 °C: pure Ni, the equiatomic alloys CoCrNi and CrMnFeCoNi (Cantor alloy), single-phase fcc (Ni) solid solution alloys (with the composition of the matrix-phase of CMSX-3 and CMSX4), and two-phase Ni-based superalloys CMSX-3 and CMSX-4. Due to the single-crystal state, grain size effects, grain boundary sliding, and grain boundary diffusion can be excluded. The results identify two major strengthening mechanisms: solid solution strengthening and other mechanisms summarized as precipitation hardening. Configurational entropy does not increase creep strength: The Cantor alloy, with the highest configurational entropy of all alloys tested, shows a weak and similar creep strength at 980 °C in comparison to pure Ni with zero configurational entropy. The element Re is a very effective strengthener, both in single-phase fcc (Ni) solid solution alloys as well as in two-phase superalloys. Quantitative estimations of different strengthening mechanisms: internal back stress, misfit stresses, Orowan bowing, and γ’-phase cutting (in the case of two-phase superalloys) are presented. Finite element simulations allow estimating the influence of solid solution strengthening of the matrix on the creep behavior of the two-phase superalloys.

Effect of Ti Element on Microstructure and Properties of Cu-Cr Alloy

2015 ◽  
Vol 817 ◽  
pp. 307-311 ◽  
Author(s):  
Peng Chao Zhang ◽  
Jin Chuan Jie ◽  
Yuan Gao ◽  
Tong Min Wang ◽  
Ting Ju Li
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Spherical Shape ◽  
Precipitation Strengthening ◽  
Peak Hardness ◽  
Ti Alloy ◽  
Strengthening Mechanisms ◽  
Vacuum Melting ◽  
Solid Solution Strengthening ◽  
Solution Strengthening

The Cu-Cr and Cu-Cr-Ti alloy plates were prepared by vacuum melting and plastic deformation. The effect of slight Ti element on microstructure and mechanical properties of Cu-Cr alloy was discussed. The result shows that Cr particles with spherical shape precipitated from Cu matrix after aging. Plenty Ti atoms dissolved in the vicinity of Cr particles and there were still parts of solid solution Ti atoms in other regions. Improvements in peak hardness and softening resistance were achieved with the addition of Ti element in Cu-Cr alloy. The addition of 0.1 wt.% Ti element makes Cu-Cr alloy possess tensile strength of 565 MPa and hardness of 185.9 HV after aging at 450 °C for 120 min, which can be attributed to multiple strengthening mechanisms, i.e. work hardening, solid solution strengthening and precipitation strengthening.

Modelling of the Influence of Laves Phase on the Creep Properties in 9% Cr Steels

2007 ◽  
Author(s):  
Hans Magnusson ◽  
Rolf Sandstro¨m
Keyword(s):  
Solid Solution ◽  
Creep Strength ◽  
Solute Drag ◽  
Laves Phase ◽  
Solid Solution Hardening ◽  
Moving Frame ◽  
Creep Properties ◽  
Solid Solution Strengthening ◽  
Solution Strengthening ◽  
Multi Component System

Nucleation and growth of Laves phase are calculated for a multi-component system. Coarsening of MX, M23C6 and Laves are also determined. The influence on creep strength is discussed by analysing particle hardening and solid solution strengthening. A model for particle size distribution is presented in order to determine the amount of dislocations that can climb across particles or generate Orowan loops. The model for solid solution hardening is based on a solution of Fick’s second law with a moving frame of reference for the concentration profiles around a climbing dislocation. This is done in order to determine the slowdown in dislocations velocity due to solute drag. The results show a loss in creep strength as the Laves phase grows.

scholarly journals Solid solution strengthening and deformation behavior of single-phase Cu-base alloys under tribological load

2020 ◽  
Vol 185 ◽  
pp. 300-308 ◽  
Author(s):  
Stephan Laube ◽  
Alexander Kauffmann ◽  
Friederike Ruebeling ◽  
Jens Freudenberger ◽  
Martin Heilmaier ◽  
...  
Keyword(s):  
Solid Solution ◽  
Deformation Behavior ◽  
Single Phase ◽  
Solid Solution Strengthening ◽  
Solution Strengthening

Effect of W addition on microstructure and mechanical properties of Ni base dual two-phase intermetallic alloys

2015 ◽  
Vol 1760 ◽  
Author(s):  
Daisuke Edatsugi ◽  
Yasuyuki Kaneno ◽  
Hiroshi Numakura ◽  
Takayuki Takasugi
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Base Alloy ◽  
Intermetallic Alloys ◽  
Two Phase ◽  
Solid Solution Strengthening ◽  
Microstructure And Mechanical Properties ◽  
Heat Treated ◽  
Phase Intermetallic ◽  
Solution Strengthening

ABSTRACTThe effect of W addition on microstructure and mechanical properties of Ni3Al (L12) and Ni3V (D022) two-phase intermetallic alloys has been investigated. W was added to the base alloy composition, Ni75Al10V12Nb3 (at. %) in place of either Ni, Al or V. The W-added alloy ingots were heat-treated in vacuum at 1575 K for 5 h. The majority of W-added alloys showed a dual two-phase microstructures while the alloy in which 3 at. % W substituted for Ni exhibited the dual two-phase microstructure containing W solid solution dispersions. Vickers hardness was significantly enhanced by W addition, which is primarily due to solid-solution strengthening.

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