investigation of deformation mechanism in ultra-fine grained

Deformation mechanism and ductile fracture behavior in

2018/1/2Tensile deformation and ductile fracture behavior of nano/ultrafine grained (Nano/UFG) steel were studied in this investigation. The results indicate that deformation induced martensite transformation (DIMT) is the active deformation mechanism in coarse grained (CG) steel because of the low stacking fault energy.

The significance of phase reversion

Work hardening and accompanying deformation mechanism are two important aspects that govern the mechanical behavior of biomedical devices. Thus, post-mortem electron microscopy of the strained region was carried out to explore the differences in the deformation mechanisms induced by grain refinement, while the strain hardening behavior was analyzed by Crussard-Jaoul (C-J) analysis of the

The electrical characterization of grain boundaries in ultra

boundary properties of ultra-fine grained Y-TZP. 2. Experimental details 2.1. Preparation and processing The ultra-fine grained starting powders, 2.6mol%YzO3-ZrO 2 with a crystallite size of 7-10 nm, were prepared by a gel precipitation

Formation mechanism of inclined fatigue

Formation mechanism of inclined fatigue-cracks in ultrafine-grained Cu processed by equal channel angular pressing Significance Statement For envisaged structural applications of ultrafine-grain (UFG) materials processed by equal channel angular pressing (ECAP), extensive attention has been paid to the fatigue performance.

Effect of dislocation and grain boundary on deformation

Ultrafine-grained interstitial-free steel fabricated by the accumulative roll-bonding method was subjected to tensile tests and analyses of AFM, TEM and XRD to identify the effects of interaction between dislocations and grain boundaries (GB) on the deformation mechanism. The AFM analyses indicated that the main deformation mechanism of this material changed from dislocation motion to

Superplastic deformation behavior of ultra

2019/7/19A fine and equiaxed grained structure provides necking free flow and large elongation []. The temperature providing 20 to 50% β -phase is optimal for a superplastic deformation [ 42 ]. The microstructures after 1.1 strain at various testing regimes are shown in figure 7 and the microstructure parameters are shown in table 2 .

The electrical characterization of grain boundaries in ultra

boundary properties of ultra-fine grained Y-TZP. 2. Experimental details 2.1. Preparation and processing The ultra-fine grained starting powders, 2.6mol%YzO3-ZrO 2 with a crystallite size of 7-10 nm, were prepared by a gel precipitation

Formation Mechanism of Ultrafine Grained

Severe plastic deformation (SPD) have had a revolutionary impact in fabricating ultrafine grained (UFG) or nanostructured metallic materials with bulky dimensions. It is, however, difficult to understand from a viewpoint of conventional metallurgy why UFG microstructures form in the as-deformed (as-SPD-processed) state without annealing process.

Investigation of reorganization of a nanocrystalline grain

In this paper, simulated biaxial creep deformation behaviour for nanocrystalline (NC) nickel (Ni) has been performed at various applied load (i.e. 1 GPa, 1.4 GPa, 2 GPa, 2.5 GPa and 3 GPa) for a particular temperature (i.e. 1210 K) using molecular dynamics (MD) simulation to investigate underlying deformation mechanism based on the structural evolution during biaxial creep process.

Change in the Mechanism of Plastic Deformation in

Abstract—A theoretical model for changing the plasticity mechanism in bimodal materials with graphene inclusions has been developed. Within the framework of the model, a theoretical study on the transition of plastic deformation from a nanocrystalline and/or ultrafine-grained matrix to the coarse-grained phase, which is inherent to bimodal materials has been performed. In particular, a

In situ TEM studies of deformation mechanisms in

The mechanical properties of ultrafine-grained and nanocrystalline materials have received a great deal of recent attention because of their unusual and promising values. However, some of the most important mechanisms of deformation remain unclear. To address this issue, an in situ nanoindentation stage has been used in a transmission electron microscope to explore the deformation behaviors of

Investigation of deformation mechanism in ultra

Investigation of deformation mechanism in ultra-fine grained metals by In-situ XRD Hiroki Adachi:Univ. of Hyogo, Yoji Miyajima:Tokyo Inst. of Tech., Masugu Sato:JASRI Recently, it has been reported that the strength of ultra-fine grained (UFG

Stress

This paper reports on a study of the stress-induced grain growth phenomenon in the presence of second-phase particles and solutes segregated at grain boundaries (GBs) during high-temperature deformation of an ultra-fine grained (UFG) Al alloy synthesized via the consolidation of mechanically milled powders. Our results show that grain growth was essentially inhibited during annealing at 673

Investigation of ultrafine grained AA1050 fabricated by

Investigation of ultrafine grained AA1050 fabricated by accumulative roll bonding Abstract Accumulative roll bonding (ARB) is an effective method to produce ultrafine-grained (UFG) sheet materials with high strength. In this work, fully annealed AA1050 sheet with an

Investigation of ultrafine grained AA1050 fabricated

Accumulative roll bonding (ARB) is an effective method to produce ultrafine-grained (UFG) sheet materials with high strength. In this work, fully annealed AA1050 sheet with an initial thickness of 1.5. mm was processed by ARB up to five cycles. The microstructure

Investigation of ultrafine grained AA1050 fabricated by

Investigation of ultrafine grained AA1050 fabricated by accumulative roll bonding Abstract Accumulative roll bonding (ARB) is an effective method to produce ultrafine-grained (UFG) sheet materials with high strength. In this work, fully annealed AA1050 sheet with an

Thermal Stability of Ultra

This chapter reviews the thermal stability of ultra-fine grained (UFG) microstructure in selected magnesium and titanium-based materials prepared by severe plastic deformation (SPD). The focus is on the wide palette of experimental methods applicable for investigation of microstructural stability. These methods include scanning electron microscopy (SEM), electron backscatter diffraction (EBSD

Investigation of deformation micro

The deformation mechanisms were established by EBSD, X-ray line pro file analysis and in-situ TEM observations. In the ultrafine-grained volume, the deformation occurred mainly through the activation of dislocation sources emitting full or partial dislocation either from grain interior or grain boundaries.

Cyclic Deformation of Ultra

Accumulative Roll-Bonding (ARB) is one of the more recently developed techniques capable of producing bulk ultra-fine grained (ufg) metals. There are still many aspects of the behavior of ufg metals that lacks an in-depth understanding, such as a generalized view of the factors that govern the cyclic deformation mechanism

Strain incompatibility and its influence on grain coarsening

The investigation was carried out using ultra-fine grained, oxygen-free high conductivity copper processed by accumulative roll-bonding. A close relationship between strain localisation and deformation-induced grain coarsening was revealed.

Unveiling the Origin of Work Hardening Behavior in an

Of many promising strategies to enhance the work hardening rate (Θ) of ultrafine-grained (UFG) steels, transformation-induced plasticity (TRIP) effect has been subjected of extensive attention owing to the high Θ arising from the martensite transformation of retained austenite during deformation.[1–3] Massive investigations on the UFG Mn TRIP steels reveal a high dependence of Θ on the

Formation and Microstructure of Ultrafine

Ultrafine-grained titanium with uniform grain size for medical applications is obtained by multi-directional forging at 773 K in air. The microstructures and microtextures in the deformed titanium specimens are investigated by optical microscopy, electron backscattered diffraction technique, and transmission electron microscopy. Titanium specimen experience the recrystallization softening at

Microstructure features of failure and mechanical

Experimental investigation of mechanical characteristics and failure regularities of the ultra-fine grained Ti–6Al–4V ELI alloy, produced by equal channel angular pressing (ECAP), have been carried out under the uniaxial tension at 300 and 77 K. These characteristics have been compared for the different structural states of the Ti–6Al–4V ELI alloy, distinguished by the average grain

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