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 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 Observation of Grain Boundary Behavior in Ni3 Al Alloys During Tensile Deformation in Sem

1988 ◽  
Vol 133 ◽  
Author(s):  
Dongliang Lin ◽  
Da Chen
Keyword(s):  
Grain Boundary ◽  
Tensile Deformation ◽  
Boundary Behavior ◽  
Local Strain ◽  
Alloy Element ◽  
Al Alloys ◽  
Chemical Compositions ◽  
In Situ Observation ◽  
Slip Transition

ABSTRACTThe deformation behavior of Ni3Al alloys with various chemical compositions and subjected to different heat treatments were in-situ observed in SEN. Moreover, in-situ observations of slip trace are supplemented by the direct observation of dislocation arrangements by TEM. In boron-doped Ni3Al alloys it is shown that close to the grain boundary there exists a thin slip transition region, within which slip lines are reoriented or other slip systems are operated to produce a local strain accommodation and to relax the stress concentration at grain boundaries. However, boron-enhenced ductility is seriously affected by alloy stoichiometry, the addition of a tertiary alloy element and heat treatment, etc.

scholarly journals In Situ Observation for Deformation-Induced Martensite Transformation (DIMT) during Tensile Deformation of 304 Stainless Steel Using Neutron Diffraction. PART I: Mechanical Response

2020 ◽  
Vol 4 (3) ◽  
pp. 31
Author(s):  
Yusuke Onuki ◽  
Shigeo Sato
Keyword(s):  
Stainless Steel ◽  
Neutron Diffraction ◽  
Martensite Transformation ◽  
Tensile Deformation ◽  
Austenite Phase ◽  
Austenitic Steels ◽  
304 Stainless Steel ◽  
Proton Accelerator ◽  
In Situ Observation

304 stainless steel is one of the most common stainless steels due to its excellent corrosion resistance and mechanical properties. Typically, a good balance between ductility and strength derives from deformation-induced martensite transformation (DIMT), but this mechanism has not been fully explained. In this study, we conducted in situ neutron diffraction measurements during the tensile deformation of commercial 304 stainless steel (at room temperature) by means of a Time-Of-Flight type neutron diffractometer, iMATERIA (BL20), at J-PARC MLF (Japan Proton Accelerator Research Complex, Materials and Life Science Experimental Facility), Japan. The fractions of α′-(BCC) and ε-(HCP) martensite were quantitatively determined by Rietveld-texture analysis, as well as the anisotropic microstrains. The strain hardening behavior corresponded well to the microstrain development in the austenite phase. Hence, the authors concluded that the existence of martensite was not a direct cause of hardening, because the dominant austenite phase strengthened to equivalent values as in the martensite phase. Moreover, the transformation-induced plasticity (TRIP) mechanism in austenitic steels is different from that of low-alloy bainitic TRIP steels.

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