Dynamic transformation during the high temperature deformation of two-phase titanium alloys

2019 ◽  
Vol 761 ◽  
pp. 138047 ◽  
Author(s):  
Baoqi Guo ◽  
S.L. Semiatin ◽  
John J. Jonas
Keyword(s):  
High Temperature ◽  
Titanium Alloys ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Two Phase ◽  
Dynamic Transformation

Structure and fracture mechanism of a two-phase chromium–nickel alloy during high-temperature deformation

2016 ◽  
Vol 117 (9) ◽  
pp. 937-944 ◽  
Author(s):  
V. N. Mironenko ◽  
A. S. Aronin ◽  
V. V. Vasenev ◽  
I. M. Aristova ◽  
I. M. Shmyt’ko ◽  
...  
Keyword(s):  
High Temperature ◽  
Nickel Alloy ◽  
Fracture Mechanism ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Two Phase

The role of interphase boundary phenomena on mechanical behavior during high-temperature deformation

1991 ◽  
Vol 49 ◽  
pp. 594-595
Author(s):  
B. Hidalgo-Prada
Keyword(s):  
High Temperature ◽  
Mechanical Behavior ◽  
Interphase Boundary ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Metallographic Analysis ◽  
Two Phase ◽  
Transmission Electron ◽  
Phase Size

The influence of interphase boundary on the mechanical behavior of a two-phase (α/β) Ni-Modified Ti-6A1-4V alloy during superplastic deformation (SPD), has been investigated in the range of temperature and strain rate where maximum ductility is - attained.Uniaxial tests for constant and differential strain rates were performed over the - range of 5.0 x 10-5 s-1 to 5.0 x 10-3 s-1 and at temperature from 1023 to 1123 K. To optimize the initial microstructure, tensile specimens were static annealed in argon for 1 hour at 815 °C ( SA-1-815).Upon completion of the tests, specimens were quenched in pre-chilled argon to pre—serve the high temperature microstructure for metallographic analysis. The gage portion of the specimen was polished and etched in a solution of 2 ml HF, 3 ml HNO3 and 95 ml H2O. Subsequently, they were subjected to scanning and transmission electron - microscopy (SEM and TEM) examination. A Quantimet Image Analizer was used for determining the phase size, its distribution and volume fractions.

High Temperature Creep Behavior of Single Crystal Gammpraime and Gamm Laloys

1988 ◽  
Vol 133 ◽  
Author(s):  
M. V. Nathal ◽  
J. O. Diaz ◽  
R. V. Miner
Keyword(s):  
High Temperature ◽  
Single Crystal ◽  
Single Crystals ◽  
Creep Behavior ◽  
Dislocation Motion ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
High Temperature Creep ◽  
Two Phase ◽  
Temperature Creep

ABSTRACTThe creep behavior of single crystals of γ′ and γ alloys were investigated and compared to the response of two phase superalloys tested previously. High temperature deformation in the γ alloys was characteristic of a climb controlled mechanism, whereas the γ′ based materials exhibited glide controlled creep behavior. The superalloys were much more creep resistant than their constituent phases, which indicates the importance of the γ-γ′ interface as a barrier for dislocation motion during creep.

Precipitate Shearing, Fault Energies, and Solute Segregation to Planar Faults in Ni-, CoNi-, and Co-Base Superalloys

2021 ◽  
Vol 51 (1) ◽  
pp. 209-240
Author(s):  
Y.M. Eggeler ◽  
K.V. Vamsi ◽  
T.M. Pollock
Keyword(s):  
High Temperature ◽  
Dislocation Dynamics ◽  
Deformation Mechanisms ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Two Phase ◽  
Planar Defects ◽  
Planar Fault ◽  
Operating Environments ◽  
Chemical Segregation

The mechanical properties of superalloys are strongly governed by the resistance to shearing of ordered precipitates by dislocations. In the operating environments of superalloys, the stresses and temperatures present during thermomechanical loading influence the dislocation shearing dynamics, which involve diffusion and segregation processes that result in a diverse array of planar defects in the ordered L12 γ′ precipitate phase. This review discusses the current understanding of high-temperature deformation mechanisms of γ′ precipitates in two-phase Ni-, Co-, and CoNi-base superalloys. The sensitivity of planar fault energies to chemical composition results in a variety of unique deformation mechanisms, and methods to determine fault energies are therefore reviewed. The degree of chemical segregation in the vicinity of planar defects reveals an apparent phase transformation within the parent γ′ phase. The kinetics of segregation to linear and planar defects play a significant role in high-temperature properties. Understanding and controlling fault energies and the associated dislocation dynamics provide a new pathway for the design of superalloys with exceptional properties.

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