Atomic force microscopic study on surface morphology of ultra-fine grained materials after tensile testing

Vinogradov, Alexei; Hashimoto, Satoshi; Patlan, V.; Kitagawa, Kazuo

doi:10.1016/s0921-5093(01)01057-7

Cited by 92 publications

(40 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The occurrence of grain boundary sliding at low temperatures has been predicted in the modeling of nanocrystalline solids using three-dimensional molecular dynamics computer simulations [53,54] and several experimental investigations [55][56][57] also suggest this mechanism as a viable deformation process. Although there have been some attempts to show localization of plastic flow in the grain boundary regions [55][56][57], convincing direct experimental evidence for the occurrence of grain boundary sliding in ultrafinegrained materials was reported only very recently [58] by employing depth sensing indentation (DSI) and atomic force microscopy (AFM).…”

Section: Introductionmentioning

confidence: 91%

“…Although there have been some attempts to show localization of plastic flow in the grain boundary regions [55][56][57], convincing direct experimental evidence for the occurrence of grain boundary sliding in ultrafinegrained materials was reported only very recently [58] by employing depth sensing indentation (DSI) and atomic force microscopy (AFM).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Characteristics of face-centered cubic metals processed by equal-channel angular pressing

2007

View full text Add to dashboard Cite

This review surveys the characteristics of face-centered cubic (fcc) metals and alloys processed by equal-channel angular pressing (ECAP). The significance of the Hall-Petch relationship for ultrafine grained structures is examined and the dependence of the saturated stress obtained in ECAP on the absolute melting temperature is described and discussed. In addition, the flow processes at low temperatures in ultrafine-grained materials and the microstructural evolution of the dislocation densities and precipitates in some alloys of practical importance are also considered briefly.

show abstract

Section: Introductionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Characteristics of face-centered cubic metals processed by equal-channel angular pressing

2007

View full text Add to dashboard Cite

show abstract

“…Although the mechanisms other than dislocation glide (grain boundary sliding, for instance) could be involved into plastic flow of UFG metals produced by SPD, 2,18) the conventional dislocation slip should not be disregarded as an elementary act of plastic deformation in these materials. 19,20) Figure 7 illustrates the intensive plastic flow which occurs after surface crack formation. This plastic deformation 2204 T. Suzuki, A. Vinogradov and S. Hashimoto occurs in the form of large-scale shear bands with clustered deformation markings extending over long distances.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Strength Enhancement and Deformation Behavior of Gold after Equal-Channel Angular Pressing

Suzuki¹,

Vinogradov

Hashimoto

2004

Mater. Trans.

View full text Add to dashboard Cite

The significant enhancement of strength is reported for pure K24 gold and its K18 alloys subjected to grain refinement by equal channel angular pressing (ECAP) in comparison with their annealed or ordinary cold-worked counterparts. The effect of strain path on the tensile behavior is discussed from the stand point of mechanical properties and damage evolution during straining. It is shown that although different processing can give rise to substantially different structures, the mechanical properties depend on the pre-strain history only slightly. The ECAP appears to be particularly effective for strengthening of pure gold and Au-Ag solid solutions where the strength can increase by a factor of 3 or 4 while in the precipitation hardenable alloys the effect of grain refinement is masked by other strengthening mechanisms and the strength increases by a factor of 2. The strain localization and features of plastic deformation in ECAP materials are discussed in detail upon in-situ and post-experimental surface observations in differently fabricated samples.

show abstract

“…3,4) Interesting properties of these materials are related to the largely increased density of lattice defects such as large angle grain boundaries and dislocations. 1,[3][4][5][6][7][8] Severe plastic deformation techniques such as equal channel angular pressing (ECAP), [9][10][11] high pressure torsion (HPT) 12) and accumulative roll-bonding (ARB) 13) have been developed for production of nano-structured materials. However, application of these techniques is limited to relatively low-strength materials.…”

Section: Introductionmentioning

confidence: 99%

Microstructures of Cutting Chips of SUS430 and SUS304 Steels, and NCF 750 and 6061-T6 Alloys

et al. 2011

View full text Add to dashboard Cite

Microstructures of chip specimens of high-strength materials produced by machining were examined by FE-SEM/EBSP method (an orientation imaging microscopy, OIM). In the ferritic SUS430 (16Cr) steel, the chip specimen with shear strain (γ) of ~7.5 was principally composed of equiaxed submicron grains which were for the most part surrounded by large angle grain boundaries (misorientation, θ ≥15°). A similar microstructure was observed in the chip specimen with γ ≈ 22 of the Inconel X-750 (NCF 750) nickel-base alloy. However, the chip specimen of the austenitic SUS304 (18Cr-8Ni) steel (γ ≈ 14) and that of the 6061-T6 (aluminum) alloy (γ ≈ 10) exhibited principally a deformed microstructure with elongated grains and sub grains separated by small angle (2°≤θ <5°) or medium angle grain boundaries (5°≤θ <15°), although equiaxed submicron grains were partly observed. The chip specimens exhibited very high hardness compared to the original materials except 6061-T6 alloy. The maximum hardness value (609 Hv) was observed in the chip specimen with γ ≈ 22 of the Inconel X-750 alloy. Strong particles with equiaxed submicron grain structure, which can be easily produced by milling of cutting chips of commercial alloys, will be potential strengthener for metal matrix composites.

show abstract

Atomic force microscopic study on surface morphology of ultra-fine grained materials after tensile testing

Cited by 92 publications

References 12 publications

Characteristics of face-centered cubic metals processed by equal-channel angular pressing

Characteristics of face-centered cubic metals processed by equal-channel angular pressing

Strength Enhancement and Deformation Behavior of Gold after Equal-Channel Angular Pressing

Microstructures of Cutting Chips of SUS430 and SUS304 Steels, and NCF 750 and 6061-T6 Alloys

Contact Info

Product

Resources

About