scholarly journals In Situ Observation of the Tensile Deformation and Fracture Behavior of Ti–5Al–5Mo–5V–1Cr–1Fe Alloy with Different Microstructures

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5794
Author(s):  
Suping Pan ◽  
Mingzhu Fu ◽  
Huiqun Liu ◽  
Yuqiang Chen ◽  
Danqing Yi
Keyword(s):  
Plastic Deformation ◽  
Fracture Behavior ◽  
Tensile Deformation ◽  
Lamellar Microstructure ◽  
Tensile Tests ◽  
In Situ Observation ◽  
Bimodal Microstructure ◽  
Deformation And Fracture ◽  
Deformation Processes

The plastic deformation processes and fracture behavior of a Ti–5Al–5Mo–5V–1Cr–1Fe alloy with bimodal and lamellar microstructures were studied by room-temperature tensile tests with in situ scanning electron microscopy (SEM) observations. The results indicate that a bimodal microstructure has a lower strength but higher ductility than a lamellar microstructure. For the bimodal microstructure, parallel, deep slip bands (SBs) are first noticed in the primary α (αp) phase lying at an angle of about 45° to the direction of the applied tension, while they are first observed in the coarse lath α (αL) phase or its interface at grain boundaries (GBs) for the lamellar microstructure. The β matrix undergoes larger plastic deformation than the αL phase in the bimodal microstructure before fracture. Microcracks are prone to nucleate at the αp/β interface and interconnect, finally causing the fracture of the bimodal microstructure. The plastic deformation is mainly restricted to within the coarse αL phase at GBs, which promotes the formation of microcracks and the intergranular fracture of the lamellar microstructure.

In situ tensile deformation and fracture behavior of Ti–24Al–14Nb–3V–0.5Mo alloy with various microstructures

2004 ◽  
Vol 12 (1) ◽  
pp. 43-53 ◽  
Author(s):  
Y. Wu ◽  
L. Zhen ◽  
D.Z. Yang ◽  
M.S. Kim ◽  
S.K. Hwang ◽  
...  
Keyword(s):  
Fracture Behavior ◽  
Tensile Deformation ◽  
Deformation And Fracture

In Situ Observation of Tensile Deformation Processes of Soft Colloidal Crystalline Latex Fibers

2009 ◽  
Vol 42 (13) ◽  
pp. 4795-4800 ◽  
Author(s):  
Jianqi Zhang ◽  
Shanshan Hu ◽  
Jens Rieger ◽  
Stephan V. Roth ◽  
Rainer Gehrke ◽  
...  
Keyword(s):  
Tensile Deformation ◽  
In Situ Observation ◽  
Deformation Processes

scholarly journals Deformation Behavior and Tensile Properties of the Semi-Equiaxed Microstructure in Near Alpha Titanium Alloy

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3380
Author(s):  
Minglang Luo ◽  
Tingyi Lin ◽  
Lei Zhou ◽  
Wei Li ◽  
Yilong Liang ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Deformation Behavior ◽  
Fracture Behavior ◽  
Tensile Deformation ◽  
Equiaxed Microstructure ◽  
Slip Bands ◽  
In Situ Method ◽  
Deformation And Fracture ◽  
Alpha Titanium

The tensile deformation and fracture behavior of a particular semi-equiaxed microstructure (S-EM) in a near alpha titanium alloy TA19 are investigated by an in situ method. In the S-EM, the thin β lamellae grow through the equiaxed αp phase (αp), and the original αp/βtrans interface in the bimodal microstructure largely disappears, forming a blurry interface between the semi-equiaxed αp phase (equiaxed αp phase that is grew through by the thin β lamellae) and the transformed β microstructure (βtrans). The formation of dense slip bands inside the semi-equiaxed αp phase in the S-EM is inhibited by the thin β lamellae during the tensile deformation. The special characteristics of the S-EM reduce the stress concentration at the interface, and the crack initiation probability in the blurry semi-αp/βtrans interface decreased compared to the distinct αp/βtrans interface in a conventional equiaxed microstructure (EM). Moreover, the ultimate tensile strength of the S-EM is higher than that of the EM with a slight loss of plasticity.

Deformation and Failure of Nanostructured Materials with Bimodal Grains

2004 ◽  
Vol 821 ◽  
Author(s):  
R.Q. Ye ◽  
B.Q. Han ◽  
E.J. Lavernia
Keyword(s):  
Nanostructured Materials ◽  
Tensile Deformation ◽  
Numerical Study ◽  
Plastic Behavior ◽  
Al Alloy ◽  
Bimodal Microstructure ◽  
Deformation And Failure ◽  
Multiple Length Scales ◽  
Deformation And Fracture ◽  
Deformation Processes

AbstractThe low ductility of nanostructured materials is attributed to the deficit of dislocation activity in the nanometer range. Recent scientific interest in nanostructured materials stems from reports of alterative combinations of mechanical properties, although a low ductility is typically reported. One promising approach based on the concept of multiple length scales is illustrated by a “bimodal” microstructure, i.e. containing a mixture of nanostructured and coarse grains. The present work reports a numerical study of the tensile deformation and fracture of a nanostructured Al alloy with a bimodal microstructure. In the theoretical framework used in the present study, the elastic-plastic behavior and deformation processes are approximated by Ramberg-Osgood formula and finite element method, respectively. The numerical results are found to be in a good agreement with the experimental behavior.

Fracture Description of AZ61 Mg-Al2O3 Materials Studied by “In Situ Tensile Test in SEM“

2016 ◽  
Vol 674 ◽  
pp. 165-172
Author(s):  
Michael Besterci ◽  
Štefan Nagy ◽  
Song Jeng Huang ◽  
Oksana Velgosová ◽  
Katarína Sülleiová ◽  
...  
Keyword(s):  
Fracture Surface ◽  
Tensile Test ◽  
Tensile Deformation ◽  
Intermetallic Phase ◽  
Weight Fraction ◽  
Average Diameter ◽  
In Situ Observation ◽  
Deformation And Fracture ◽  
The Matrix

In situ observation of AZ61 Mg alloy with 5 wt. % of Al2O3 in the SEM was performed to study influence of the weight fraction of Al2O3 particles on the deformation and fracture description during the tensile test. Structure of the experimental materials was also analysed; microstructures were heterogeneous, with randomly distributed globular Al2O3 particles (average diameter of 25 nm) and Mg17Al12 intermetallic phase (average diameter of 0.4 mm). It was shown that during the tensile deformation the failure of Mg17Al12 particles and decohesion of the matrix-Al2O3 particles interphase boundary started simultaneously. Decohesion resulted from the different physical properties of matrix and Al2O3 particles. The influence of the Al2O3 weight fraction on the final fracture was evident; for the material with 5 wt. % of Al2O3, the fracture surface was approximately perpendicular to the loading direction. The fracture surface had transcrystalline ductile character.

scholarly journals In situ observation of deformation processes in nanocrystalline face-centered cubic metals

2016 ◽  
Vol 7 ◽  
pp. 572-580 ◽  
Author(s):  
Aaron Kobler ◽  
Christian Brandl ◽  
Horst Hahn ◽  
Christian Kübel
Keyword(s):  
Thin Films ◽  
Plastic Deformation ◽  
Large Angle ◽  
In Situ Observation ◽  
Face Centered Cubic ◽  
Nanocrystalline Metals ◽  
Deformation Processes ◽  
Face Centered ◽  
Grain Boundary Motion

The atomistic mechanisms active during plastic deformation of nanocrystalline metals are still a subject of controversy. The recently developed approach of combining automated crystal orientation mapping (ACOM) and in situ straining inside a transmission electron microscope was applied to study the deformation of nanocrystalline Pd x Au1− x thin films. This combination enables direct imaging of simultaneously occurring plastic deformation processes in one experiment, such as grain boundary motion, twin activity and grain rotation. Large-angle grain rotations with ≈39° and ≈60° occur and can be related to twin formation, twin migration and twin–twin interaction as a result of partial dislocation activity. Furthermore, plastic deformation in nanocrystalline thin films was found to be partially reversible upon rupture of the film. In conclusion, conventional deformation mechanisms are still active in nanocrystalline metals but with different weighting as compared with conventional materials with coarser grains.

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