Mechanical Properties of Nanocrystalline and Ultrafine‐Grained Nickel with Bimodal Microstructure

Qian, Tao; Караман, И.; Marx, Michael

doi:10.1002/adem.201300570

Cited by 20 publications

(5 citation statements)

References 47 publications

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“…Numerous investigators have measured the room temperature strength and ductility of a wide range of materials subjected to SPD. Results located for a group of most popular materials including aluminum and its alloys, copper and its alloys, nickel,, iron, austenitic alloys, and steels including TWIP and low carbon steels, titanium, and Ti6Al4V alloy are summarized in Figure , where the ultimate tensile strength is plotted versus total elongation to failure (a) and uniform elongation (b), respectively. Despite the broad diversity of structural states and processing schedules used in a variety of SPD techniques for grain refinement, the abundant literature demonstrates in a conclusive way that the trends in the mechanical behavior of UFG materials are common and clear: a spectacular enhancement of strength upon SPD processing concurs with a great loss of ductility.…”

Section: Survey Of Experimental Results On the Strength And Ductilitymentioning

confidence: 99%

“…The improved ductility is associated with relaxation of the internal stresses, reduction of excess dislocation density, etc. Among other recipes for achieving coexisting high strength and high ductility at room temperature, tailoring the bimodal grain size distribution has been suggested particularly effective . The bi‐modal grain size distribution can be created at some judicially chosen annealing conditions (temperature and time) due to sporadic abnormal grain growth in the specimen volume.…”

Section: Survey Of Experimental Results On the Strength And Ductilitymentioning

confidence: 99%

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Mechanical Properties of Ultrafine‐Grained Metals: New Challenges and Perspectives

Vinogradov

2015

Adv Eng Mater

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Investigations of the behavior of ultrafine-grained (UFG) materials manufactured by severe plastic deformation (SPD) have been greatly motivated by the expectations that they may have unique properties as well as by the desire to understand the fundamental mechanisms underlying the specific properties associated with extreme grain refinement. Although the concurrent improvement of both strength and ductility is possible via SPD, the most commonly observed high strength of UFG materials is paired with a very limited uniform elongation. Based on the dislocation kinetics and its relation with the Consid ere instability, an attempt is made to provide a unified view for the hardening behaviour and early macroscopic strain localization. Motivation and ObjectivesSevere plastic deformation (SPD) is commonly referred to a group of metal forming processes in which a very large plastic strain is imposed on a bulk process in order to make an ultrafine-grained (UFG) metal. [1] A broad variety of recently emerged SPD techniques provide technologically relevant ways to deform metallic materials to giant strains hardly achievable with conventional processing routes. [2] Such techniques, the origin of which goes back to the pioneering work by Bridgman, [3] pave a new avenue toward designing bulk materials with exceptionally small grain size (down to deep sub-micron range) and outstanding strength. A tremendous amount of knowledge has been accumulated and developed in the field of SPD since the 70th of the past century. Most of the significant details of SPD processing techniques, microstructures, and properties of UFG metals and alloys can be found in several comprehensive reviews. [2,[4][5][6] To avoid repetitions, in the present review article, focus will be primarily on the critical analysis of data existing in the literature regarding the strength and ductility of UFG metals manufactured by SPD. In this brief review, we endeavor to summarize the most prominent features of the mechanical behavior of these materials and to rationalize from the standpoint of fundamentals of dislocation kinetics accounting for both strain-hardening and premature strain localization. Survey of Experimental Results on the Strength and Ductility of SPD MaterialsNumerous investigators have measured the room temperature strength and ductility of a wide range of materials subjected to SPD. Results located for a group of most popular materials including aluminum [7,8] and its alloys, [9][10][11] copper [12][13][14][15][16] and its alloys, [17] nickel, [12,18,19] , iron, [8,12,20] austenitic alloys, and steels [21][22][23] including TWIP [24] and low carbon steels, [25] titanium, [26][27][28][29] and Ti6Al4V alloy [28,30] are summarized in Figure 1, where the ultimate tensile strength is plotted versus total elongation to failure (a) and uniform elongation

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Section: Survey Of Experimental Results On the Strength And Ductilitymentioning

confidence: 99%

Section: Survey Of Experimental Results On the Strength And Ductilitymentioning

confidence: 99%

Mechanical Properties of Ultrafine‐Grained Metals: New Challenges and Perspectives

Vinogradov

2015

Adv Eng Mater

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“…In addition, mechanical instability during fatigue test of nanocrystalline and ultrafine grained materials was also observed and intensively studied in the literature [21][22][23]. Considering the mechanical instability of nanocrystalline materials, strategies were developed for improvement, such as the utilization of non-uniform grain sizes [20,24] and secondary phase or particles [25,26]. Among the promising strategies is the application of multiple phases in the nanocrystalline materials [25,26], which are also termed metallic composites, in which different dislocation activity or deformation mechanisms in the primary and secondary phases are expected to improve the plastic deformation behavior of nanocrystalline materials.…”

Section: Introductionmentioning

confidence: 99%

Microstructure Evolution and Mechanical Stability of Supersaturated Solid Solution Co-Rich Nanocrystalline Co-Cu Produced by Pulsed Electrodeposition

2020

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Thick films of supersaturated solid solution nanocrystalline Co-Cu (28 at.% Cu) were synthesized through the pulsed electrodeposition technique. Microstructural changes of nanocrystalline Co-Cu were intensively studied at various annealing temperatures. Annealing at 300 °C results in a spinodal decomposition within the individual grains, with no grain coarsening. On the other hand, distinct phase separation of Co-Cu is detected at annealing temperatures beyond 400 °C. Static micro-bending tests show that the nanocrystalline Co-Cu alloy exhibits a very high yield strength and ductile behavior, with no crack formation. Static micro-bending tests also reported that a large plastic deformation is observed, but no microstructure change is detected. On the other hand, observation on the fatigue resistance of nanocrystalline Co-Cu shows that grain coarsening is observed after conducting the cyclic micro-bending test.

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“…For example, Lu et al [41] and Zhang et al [42] fabricated Cu and TWIP steels with gradient grain structure respectively, and found that their HCF strengths were higher than those of CG and UFG counterparts. Qian et al [43] studied the fatigue behavior of heterogeneous nickel with different grain sizes in the DZs, and found that the HCF strength was significantly improved as the grain size in the DZs was lower than 1 μm, which was even higher than that of the uniform UFG nickel.…”

Section: Introductionmentioning

confidence: 99%

Improving the high-cycle fatigue strength of heterogeneous carbon nanotube/Al-Cu-Mg composites through grain size design in ductile-zones

Li²,

Liu

et al. 2021

Composites Part B: Engineering

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Mechanical Properties of Nanocrystalline and Ultrafine‐Grained Nickel with Bimodal Microstructure

Cited by 20 publications

References 47 publications

Mechanical Properties of Ultrafine‐Grained Metals: New Challenges and Perspectives

Mechanical Properties of Ultrafine‐Grained Metals: New Challenges and Perspectives

Microstructure Evolution and Mechanical Stability of Supersaturated Solid Solution Co-Rich Nanocrystalline Co-Cu Produced by Pulsed Electrodeposition

Improving the high-cycle fatigue strength of heterogeneous carbon nanotube/Al-Cu-Mg composites through grain size design in ductile-zones

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