Enhancement of strength and stability of nanostructured Ni by small amounts of solutes

Zhang, H. W.; Lu, K.; Pippan, Reinhard; Huang, Xiaoxu; Hansen, Niels

doi:10.1016/j.scriptamat.2011.06.003

Cited by 44 publications

(22 citation statements)

References 14 publications

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“…The NTs (as marked by arrows) appeared to be curved along their lengths, which may be an indication of deformation twinning [11]. The NTs were likely to be aligned roughly perpendicular to the loading direction and parallel to the shear direction during SPD upon impact, which was consistent with observations in the cases of metals subjected to DPD [11] and high-pressure torsion (HPT) [17,18]. Higher magnification HRTEM image (Fig.…”

Section: Resultssupporting

confidence: 83%

“…In contrast, no twins were observed in NC Ni with grain sizes of 30-100 nm deformed at _ e 410 7 s À 1 using laser-driven compression under high pressures (20-70 GPa) [26]. Interestingly, at certain levels of accumulated shear strain, NTs were observed in NC Ni with a purity of 499.5% and grain sizes of 30-130 nm which had been formed via HPT at _ e o10 À 1 s À 1 and a pressure of 4 GPa [17,18]. In this case, however, the estimated maximum temperature in the workpiece was below $ 373 K [27], which is much lower than the temperature used in our research.…”

Section: Resultsmentioning

confidence: 98%

“…Additionally, small amounts of solute atoms such as Cu (Table 1), which has a relatively high modulus misfit compared with Ni (the shear moduli of Cu and Ni are 46 GPa and 79 GPa, respectively), might result in a reduction in dislocation mobility by dislocation-solute interaction (i.e., reduction in SFE, lowering the Z * ) [18]. Also, the addition of Co (Table 1) into Ni can lead to reduction in SFE [29].…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Nanoscale deformation twinning at ultrahigh strain rates during kinetic spraying of nickel

Bae¹,

Kang²,

Lee³

2012

Materials Letters

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Section: Resultssupporting

confidence: 83%

Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Nanoscale deformation twinning at ultrahigh strain rates during kinetic spraying of nickel

Bae¹,

Kang²,

Lee³

2012

Materials Letters

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“…Another way to stabilize nanostructured metals is to use alloying elements that may form boundary segregation or precipitates in the nanostructured metals. Different alloying elements may have different efficiency in stabilizing nanostructured metals [15,16]. In our present studies [17][18], we found that a nanostructured lamellar structure with an average lamellar boundary spacing of 200 nm can be produced after 98% cold rolling in an Al-0.3%Cu alloy with an ultra-high pure Al matrix (99.9996%) and an addition of a small amount (0.3wt%) Cu.…”

Section: Introductionsupporting

confidence: 51%

Characterization of Cu Distribution in an Al-0.3%Cu Alloy Cold Rolled to 98%

Shuai

Huang

et al. 2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. In this study, the distribution of Cu element in a Al (99.9996% purity)-0.3%Cu alloy cold rolled to 98% has been characterized in detail by using three-dimensional atom probe (3DAP) and ChemiSTEM techniques. The cold rolled structure is a typical high strain lamellar structure with an average boundary spacing of 200 nm, indicating a strong role of the small amount of Cu element in stabilizing the microstructure to form the fine scale structure. A heavy segregation of Cu element in the lamellar boundaries of high angles has been observed and the Cu concentration in the boundaries can be as high as 20 times of the nominal concentration of the alloy, which is considered as the main reason for a formation of a stable nanoscale lamellar structure.

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“…Moreover, by adding the data from other Ni samples heavily deformed by either conventional rolling [20,32] or high pressure torsion (HPT) [33], it is seen that this relationship holds for a wide range of d av , which suggests that the strengthening mechanism for the ARBprocessed samples and for the samples produced by CR and HPT are similar. Note that the values of d av in [33] were determined by TEM in the same way as for the present ARB data, while for the rolled samples in [32] the TEM data were reported in the form of the average spacings between geometrically necessary boundaries (GNBs) and incidental boundaries (IDBs), d GNB , and d IDB , respectively. To allow a direct comparison with the average boundary spacings measured along test random lines the data were therefore converted using the exact stereological relationship:…”

Section: Analysis Of Mechanical Behaviormentioning

confidence: 90%

Microstructure and mechanical properties of nickel processed by accumulative roll bonding

Zhang

Mishin

Kamikawa

et al. 2013

Materials Science and Engineering: A

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A detailed investigation of the microstructure and mechanical properties has been conducted in pure nickel deformed to high strains using accumulative roll bonding (ARB). Samples have been investigated after different numbers of ARB cycles and the results have been compared with data for nickel processed by other deformation techniques, with particular focus on conventional rolling. It is found that the structural evolution in ARB-processed nickel is rapid at low strains followed by a slower evolution as the strain approaches ultrahigh levels. Comparing samples processed by ARB and conventional rolling to an identical nominal strain, the microstructure after ARB is more refined and contains a greater fraction of high angle boundaries. This enhanced refinement is attributed to the geometric accumulation of shear-strain influenced volumes as a result of the ARB process and large-draught rolling conditions. Based on the observations, it is suggested that the key strengthening mechanisms in deformed nickel are grain boundary and dislocation boundary strengthening, and that the strength-microstructure relationship can be expressed by a single parameter equation, σ-σ0 = k2dav-0.5, where k2 is a constant and dav is the average boundary spacing in the deformed microstructure. Abstract: A detailed investigation of the microstructure and mechanical properties has been conducted in pure nickel deformed to high strains using accumulative roll bonding (ARB).Samples have been investigated after different numbers of ARB cycles and the results have been compared with data for nickel processed by other deformation techniques, with particular focus on conventional rolling. It is found that the structural evolution in ARB-processed nickel is rapid at low strains followed by a slower evolution as the strain approaches ultrahigh levels.Comparing samples processed by ARB and conventional rolling to an identical nominal strain, the microstructure after ARB is more refined and contains a greater fraction of high angle boundaries. This enhanced refinement is attributed to the geometric accumulation of shear-strain influenced volumes as a result of the ARB process and large-draught rolling conditions. Based on *Manuscript Click here to view linked References 2 the observations, it is suggested that the key strengthening mechanisms in deformed nickel are grain boundary and dislocation boundary strengthening, and that the strength-microstructure relationship can be expressed by a single parameter equation, σ-σ 0 = k 2 d av -0.5 , where k 2 is a constant and d av is the average boundary spacing in the deformed microstructure.

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Enhancement of strength and stability of nanostructured Ni by small amounts of solutes

Cited by 44 publications

References 14 publications

Nanoscale deformation twinning at ultrahigh strain rates during kinetic spraying of nickel

Nanoscale deformation twinning at ultrahigh strain rates during kinetic spraying of nickel

Characterization of Cu Distribution in an Al-0.3%Cu Alloy Cold Rolled to 98%

Microstructure and mechanical properties of nickel processed by accumulative roll bonding

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