Cyclic Deformation Behaviour and Possibilities for Enhancing the Fatigue Properties of Ultrafine‐Grained Metals

Höppel, H. W.; Xu, Cheng; Kautz, M.; Barta‐Schreiber, N.; Langdon, Terence G.; Mughrabi, H.

doi:10.1002/3527602461.ch12b

Cited by 17 publications

(15 citation statements)

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“…This result is obviously in disagreement with the present result. On the other hand, Höppel et al 12,20,28) have reported that shear banding and pronounced grain coarsening take place during cyclic deformation of high-purity UFG Cu (99.99%), while they have not observed the grain elongation as represented in the present study. Therefore, the results of our study accord qualitatively with those obtained by Höppel et al 12,20,28) From all these findings, it is evident that the stability of UFG structure during cyclic deformation strongly depends on the purity of materials.…”

Section: Microstructural Characterizationcontrasting

confidence: 47%

“…In the previous studies mentioned above, 13,14,17,18,27) it has been concluded that there is no relationship between the SB formation and the grain coarsening since as-ECAPed grain structures are kept in fatigued specimens with clear SBs. On the contrary, Mughrabi and Höppel, 19) and Höppel et al 20,28) have insisted that the grain coarsening plays a dominant role in the formation of the SBs. From Fig.…”

Section: Microstructural Characterizationmentioning

confidence: 98%

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Cyclic Deformation Behavior of Ultra-Fine Grained Copper Produced by Equal Channel Angular Pressing

et al. 2009

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Cyclic deformation behavior of ultra-fine grained (UFG) Cu of 99.99% purity processed by equal-channel angular pressing was investigated. In tension-compression fatigue tests under strain control, UFG Cu showed cyclic softening. Shear bands were formed along the direction inclined by about 45 from the loading axis. Observations using an electron backscattering diffraction technique and transmission electron microscopy revealed that local grain growth took place in the shear bands and overall grains elongated along the shear direction. Cyclic softening can be understood as a result of dynamic grain coarsening occurred intensively in the strain localized shear bands.

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Section: Microstructural Characterizationcontrasting

confidence: 47%

Section: Microstructural Characterizationmentioning

confidence: 98%

Cyclic Deformation Behavior of Ultra-Fine Grained Copper Produced by Equal Channel Angular Pressing

et al. 2009

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“…To the best of the authors’ knowledge, this is the first report of its kind on the cyclic deformation response and behavior of ARBed CP aluminum in literature. However, there are a number of reports (e.g., [ 5 , 6 , 7 ]) on the cyclic deformation behavior of ufg CP aluminum processed with the Equal Channel Angular Pressing (ECAP) technique—a method often considered (e.g., in [ 8 ]) to be one of the most developed of the severe plastic deformation techniques. On one hand, grain coarsening and the associated cyclic softening response upon cyclic deformation have been reported for the ECAPed CP aluminum in [ 5 , 6 ].…”

Section: Introductionmentioning

confidence: 99%

“…However, there are a number of reports (e.g., [ 5 , 6 , 7 ]) on the cyclic deformation behavior of ufg CP aluminum processed with the Equal Channel Angular Pressing (ECAP) technique—a method often considered (e.g., in [ 8 ]) to be one of the most developed of the severe plastic deformation techniques. On one hand, grain coarsening and the associated cyclic softening response upon cyclic deformation have been reported for the ECAPed CP aluminum in [ 5 , 6 ]. Höppel et al [ 6 ] have further specified that grain coarsening upon cyclic deformation occurs along the plane of maximum shear stress, and consequently they have suggested that this is a form of macroscopic shear banding.…”

Section: Introductionmentioning

confidence: 99%

Cyclic Deformation of Ultra-Fine Grained Commercial Purity Aluminum Processed by Accumulative Roll-Bonding

Kwan

Wang

2013

Materials

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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(s). This study aims to advance the understanding of the cyclic deformation behavior of ufg metals through the systematic investigation of ARB processed aluminum upon cyclic loading. It was found that the cyclic softening response often reported for ufg metals is largely influenced by the microstructure stability as the cyclic softening response is facilitated by grain coarsening which becomes inhibited with highly stable microstructure. On one hand, shear bands resembling braids of dislocations trespassing multiple grains have been observed to operate for the accommodation of the imposed cyclic strain in cases where grain coarsening is largely restricted. On the other hand, it was found that the microstructure stability can be overcome at higher applied cyclic plastic strain levels, leading to grain coarsening and thus a cyclic softening response. The findings in this study have further confirmed that the cyclic softening behavior found in many ufg metals, which may be detrimental in practical applications, can be inhibited by improvements in the microstructure stability.

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“…The shear bands in the above listed reports are of a scale much larger than the grain size of the samples. In fact, early reports by Mughrabi and Höppel [62] and Höppel et al [63] indicated the appearance of grain coarsening along the maximum shear stress direction in both commercially purified aluminum and high purity copper. Furukawa et al ARB, 7 Passes, Δε total /2 = 1.7 x 10 -3 ref.…”

Section: Figurementioning

confidence: 99%

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

Kwan

Wang

2012

Metals

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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.

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Cyclic Deformation Behaviour and Possibilities for Enhancing the Fatigue Properties of Ultrafine‐Grained Metals

Cited by 17 publications

References 0 publications

Cyclic Deformation Behavior of Ultra-Fine Grained Copper Produced by Equal Channel Angular Pressing

Cyclic Deformation Behavior of Ultra-Fine Grained Copper Produced by Equal Channel Angular Pressing

Cyclic Deformation of Ultra-Fine Grained Commercial Purity Aluminum Processed by Accumulative Roll-Bonding

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

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