Cyclic behavior of ultrafine-grain titanium produced by severe plastic deformation

Vinogradov, Alexei; Stolyarov, V. V.; Hashimoto, Satoshi; Valiev, Ruslan Z.

doi:10.1016/s0921-5093(01)01262-x

Cited by 195 publications

(134 citation statements)

References 32 publications

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“…structure are still quite limited. [20][21][22] In addition, all of the UFG materials used for the fatigue studies in the references were fabricated by the ECAP process. Fatigue data of the materials fabricated by other SPD techniques are also required for understanding the universal fatigue behaviors of the UFG metals.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Crack Propagation Behavior in Commercial Purity Ti Severely Deformed by Accumulative Roll Bonding Process

et al. 2008

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Fatigue properties of commercial purity titanium sheets severely deformed by the accumulative roll bonding (ARB) process were investigated. The ARB process was carried out up to 6 cycles (equivalent strain, " eq. ¼ 4:8). The sheets ARB processed by 2-, 4-and 6-cycle consist of fine equiaxed grains and elongated lamellar grains. In the sheet ARB processed by 6-cycle, the mean size of fine equiaxed grain was 89 nm, and the mean thickness of the lamellar grains were 67 nm. The tensile strength increased with increasing the number of the ARB cycle. Fatigue crack growth tests were performed to clarify the fatigue properties such as the crack growth rate and threshold stress intensity factor range for crack growth (ÁK th ). The ÁK th of the ARB processed specimens were smaller than that of the starting sheet. The ÁK th decreased with increasing the number of the ARB cycle until 4-cycle. However, the ÁK th of 6-cycle specimen was larger than that of the 4-cycle specimen. Fracture surface of the 6-cycle specimen was different from that of the 2-and 4-cycle specimens. Fatigue crack propagation behavior changes between 4-and 6-cycle specimens. On the other hand, the crack growth rate decreases with increasing the number of the ARB cycle.

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Section: Introductionmentioning

confidence: 99%

Fatigue Crack Propagation Behavior in Commercial Purity Ti Severely Deformed by Accumulative Roll Bonding Process

et al. 2008

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“…A number of experimental investigations about nc materials have been carried out (e.g. their production by equal channel angular pressing [1][2][3][4][5][6][7][8][9][10]). However, investigations into the fatigue properties of electrodeposited nc metal are limited.…”

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confidence: 99%

Shear bands at the fatigue crack tip of nanocrystalline nickel

Xie

Hong

2007

Scripta Materialia

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Fatigue crack growth rates in electrodeposited nanocrystalline Ni and its coarse counterpart were experimentally investigated in this paper. The shear bands, called the epsilon plastic zone, were observed on the surface of nanocrystalline Ni samples. The length of the shear bands is close to the estimated size of the plastic zone at the crack tip. Atomic force microscopy measurements indicate that the shear strain in the shear bands and the width of shear bands increase with related crack length.

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“…The ECAP possesses potential for further improvement of ductility by increasing the number of passes. 17) However, because of production cost associated with ECAP of precious metals, the demanding mechanical properties should be judiciously specified upon the industrial design and can be attained probably within a small number of pressings.…”

Section: Discussionmentioning

confidence: 99%

“…Perhaps, the appearance of such a long-wave pattern is reasoned by meso-mechanics of plastic deformation. 16,17) Let us notice that the final fracture occurred along the shear plane OO 0 of the last ECA-pressing, Fig. 9(i), which seems to be common for all ECAP materials tested.…”

Section: Precipitation Hardenable Au-125ag-125cu Alloymentioning

confidence: 90%

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

Suzuki¹,

Vinogradov

Hashimoto

2004

Mater. Trans.

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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.

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Cyclic behavior of ultrafine-grain titanium produced by severe plastic deformation

Cited by 195 publications

References 32 publications

Fatigue Crack Propagation Behavior in Commercial Purity Ti Severely Deformed by Accumulative Roll Bonding Process

Fatigue Crack Propagation Behavior in Commercial Purity Ti Severely Deformed by Accumulative Roll Bonding Process

Shear bands at the fatigue crack tip of nanocrystalline nickel

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

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