Cyclic stress–strain response of ultrafine grained copper

Maier, Hans Jürgen; Gabor, P.; Gupta, Nishtha; Караман, И.; Haouaoui, M.

doi:10.1016/j.ijfatigue.2005.05.004

Cited by 98 publications

(58 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[5] Although limited research has been conducted into the fatigue behaviors of these materials, most published studies describe work conducted with ECAE materials. [4,[6][7][8][9][10][11][12] Low-cycle fatigue testing of ECAE metals has led to the conclusion that the fatigue lives of these UFG metals are only 20 to 50 pct of their coarse grain conventional counterparts, although a recovery heat treatment of these metals increases their fatigue lives. [4] Research into monotonic properties has shown that processing methods greatly change the final mechanical properties of UFG materials, [12,13] so it is not possible to make generalized predictions regarding the fatigue behavior of all UFG materials based solely on data collected for ECAE materials.…”

Section: Ultra-fine-grain (Ufg) and Nanocrystallinementioning

confidence: 99%

Low-Cycle Fatigue of Ultra-Fine-Grained Cryomilled 5083 Aluminum Alloy

Walley

Lavernia

Gibeling

2009

Metall Mater Trans A

View full text Add to dashboard Cite

The cyclic deformation behavior of cryomilled (CM) AA5083 alloys was compared to that of conventional AA5083-H131. The materials studied were a 100 pct CM alloy with a Gaussian grain size average of 315 nm and an alloy created by mixing 85 pct CM powder with 15 pct unmilled powder before consolidation to fabricate a plate with a bimodal grain size distribution with peak averages at 240 nm and 1.8 lm. Although the ultra-fine-grain (UFG) alloys exhibited considerably higher tensile strengths than those of the conventional material, the results from plastic-strain-controlled low-cycle fatigue tests demonstrate that all three materials exhibit identical fatigue lives across a range of plastic strain amplitudes. The CM materials exhibited softening during the first cycle, similar to other alloys produced by conventional powder metallurgy, followed by continual hardening to saturation before failure. The results reported in this study show that fatigue deformation in the CM material is accompanied by slight grain growth, pinning of dislocations at the grain boundaries, and grain rotation to produce macroscopic slip bands that localize strain, creating a single dominant fatigue crack. In contrast, the conventional alloy exhibits a cell structure and more diffuse fatigue damage accumulation.

show abstract

Section: Ultra-fine-grain (Ufg) and Nanocrystallinementioning

confidence: 99%

Low-Cycle Fatigue of Ultra-Fine-Grained Cryomilled 5083 Aluminum Alloy

Walley

Lavernia

Gibeling

2009

Metall Mater Trans A

View full text Add to dashboard Cite

show abstract

“…Concerning the fatigue behaviors, crack growth rate (da= dN À ÁK), [5][6][7][8] fatigue life (S-N curve), [9][10][11] cyclic response (stress-strain curve, hysteresis loop), [9][10][11][12][13][14][15][16][17][18][19] etc., have been reported in the UFG materials with F.C.C. or B.C.C.…”

Section: Introductionmentioning

confidence: 99%

“…structure, such as pure Cu, [11][12][13]15,17) Cu alloy, 8) Al alloy, 5,6,9,14,16,18) low carbon steel 7) and so on. 10,17,19) However, fatigue data of the UFG metals having H.C.P. structure are still quite limited.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2008

View full text Add to dashboard Cite

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.

show abstract

“…Agnew and his co-workers [22] later in 1999 further confirmed such a phenomenon, i.e., cyclic softening response following cyclic hardening, reported in [20]. Later observations of various extent of cyclic softening were reported by a number of other researchers, i.e., reference [23][24][25][26][27][28][29][30][31][32][33][35][36][37][38]56,58]. It should be noted that these reports are largely based on high purity copper.…”

Section: Overview Of the Cyclic Deformation Behavior Of Spded Metalsmentioning

confidence: 63%

“…Many of the reports on the cyclic deformation behavior of SPDed metals have been based on metals processed by ECAP, e.g., for high purity copper [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38], technical purity copper [33,[39][40][41][42][43][44], aluminium and aluminum alloys [45][46][47][48][49][50][51], commercial purity titanium [52], IF steel [53,54], and α-brass [55]. There are also reports, albeit fewer in quantity, based on products of different techniques, such as high purity copper processed by HPT [36], high purity copper processed by ARB [56,57], and aluminum and aluminum alloys processed by cryogenic rolling [58,59].…”

Section: Overview Of the Cyclic Deformation Behavior Of Spded Metalsmentioning

confidence: 99%

The Cyclic Deformation Behavior of Severe Plastic Deformation (SPD) Metals and the Influential Factors

Kwan

Wang

2012

Metals

View full text Add to dashboard Cite

Abstract:A deeper understanding of the mechanical behavior of ultra-fine (UF) and nanocrystalline (NC) grained metals is necessary with the growing interest in using UF and NC grained metals for structural applications. The cyclic deformation response and behavior of UF and NC grained metals is one aspect that has been gaining momentum as a major research topic for the past ten years. Severe Plastic Deformation (SPD) materials are often in the spotlight for cyclic deformation studies as they are usually in the form of bulk work pieces and have UF and NC grains. Some well known techniques in the category of SPD processing are High Pressure Torsion (HPT), Equal Channel Angular Pressing (ECAP), and Accumulative Roll-Bonding (ARB). In this report, the literature on the cyclic deformation response and behavior of SPDed metals will be reviewed. The cyclic response of such materials is found to range from cyclic hardening to cyclic softening depending on various factors. Specifically, for SPDed UF grained metals, their behavior has often been associated with the observation of grain coarsening during cycling. Consequently, the many factors that affect the cyclic deformation response of SPDed metals can be summarized into three major aspects: (1) the microstructure stability; (2) the limitation of the cyclic lifespan; and lastly (3) the imposed plastic strain amplitude.

show abstract

Cyclic stress–strain response of ultrafine grained copper

Cited by 98 publications

References 42 publications

Low-Cycle Fatigue of Ultra-Fine-Grained Cryomilled 5083 Aluminum Alloy

Low-Cycle Fatigue of Ultra-Fine-Grained Cryomilled 5083 Aluminum Alloy

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

The Cyclic Deformation Behavior of Severe Plastic Deformation (SPD) Metals and the Influential Factors

Contact Info

Product

Resources

About