Plastic Deformation of Al0.3CoCrFeNi and AlCoCrFeNi High-Entropy Alloys Under Nanoindentation

Jiao, Zhiming; Ma, Shuang; Gao, Yuan; Wang, Zhi Hua; Yang, Huijun; Qiao, J.W.

doi:10.1007/s11665-015-1576-0

Cited by 58 publications

(21 citation statements)

References 31 publications

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“…Nano-indentation technique has been widely used to characterize the small-scale deformation behavior of materials [9][10][11][12][13][14][15]. However, there are limited reports on the creep behavior of MPEAs using nano-indentation, and majority of the studies are at room temperature with a maximum load of 100 mN [16][17][18][19][20][21][22]. There are no reports on the deformation behavior of MPEAs as a function of temperature comparing static and dynamic loads.…”

Section: Introductionmentioning

confidence: 99%

High-Temperature Nano-Indentation Creep Behavior of Multi-Principal Element Alloys under Static and Dynamic Loads

Sadeghilaridjani

Mukherjee

2020

Metals

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Creep is a serious concern reducing the efficiency and service life of components in various structural applications. Multi-principal element alloys are attractive as a new generation of structural materials due to their desirable elevated temperature mechanical properties. Here, time-dependent plastic deformation behavior of two multi-principal element alloys, CoCrNi and CoCrFeMnNi, was investigated using nano-indentation technique over the temperature range of 298 K to 573 K under static and dynamic loads with applied load up to 1000 mN. The stress exponent was determined to be in the range of 15 to 135 indicating dislocation creep as the dominant mechanism. The activation volume was ~25b3 for both CoCrNi and CoCrFeMnNi alloys, which is in the range indicating dislocation glide. The stress exponent increased with increasing indentation depth due to higher density and entanglement of dislocations, and decreased with increasing temperature owing to thermally activated dislocations. The results for the two multi-principal element alloys were compared with pure Ni. CoCrNi showed the smallest creep displacement and the highest activation energy among the three systems studied indicating its superior creep resistance.

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Section: Introductionmentioning

confidence: 99%

High-Temperature Nano-Indentation Creep Behavior of Multi-Principal Element Alloys under Static and Dynamic Loads

Sadeghilaridjani

Mukherjee

2020

Metals

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“…Nanoindentation is a convenient and reliable examination method to investigate mechanical properties with small volumes and has been widely used to examine various materials [25][26][27][28][29]. Nanoindentation is a continuous measurement of the load and displacement.…”

Section: Introductionmentioning

confidence: 99%

Determination of the Mechanical Properties of PIN–PMN–PT Bulk Single Crystals by Nanoindentation

Zhang

Xing

et al. 2020

Crystals

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The present study aimed to experimentally evaluate the mechanical properties of Pb(In1/2Nb1/2)O3–Pb(Mg1/3Nb2/3)O3–PbTiO3 (PIN–PMN–PT) bulk single crystals with different crystallographic directions using the nanoindentation technique. The load–indentation depth curves, elastic and plastic deformations, hardnesses, and Young’s moduli of [100]- and [110]-oriented 0.28PIN–0.43PMN–0.29PT bulk single crystals were investigated. Our results show that with an increase in the maximum indentation depth hmax, the plastic residual percentage increased for both the [100]- and the [110]-oriented single crystals. At each hmax, the plastic residual percentage of the [100]-oriented PIN–PMN–PT single crystals was less than that of the [110]-oriented PIN–PMN–PT single crystals. At hmax from 500 nm to 2000 nm, the plastic deformation was larger than the elastic deformation, and the plastic residual percentage was larger than 50% for both the [100]- and the [110]-oriented single crystals. This means that the plastic deformation dominated in the indentation process of PIN–PMN–PT single crystals. The indentation size effect on the hardness of the PIN–PMN–PT single crystals was apparent in the nanoindentation process. Both the hardness and the Young’s modulus of the [100]-PIN–PMN–PT single crystals were greater than those of the [110]-PIN–PMN–PT single crystals, which indicates that the PIN–PMN–PT single crystals had anisotropic mechanical characteristics.

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“…The creep behavior of a number of HEA systems has been studied in a range of temperatures, including the Al 0.15 CoCrFeNi HEA with a face-centered cubic (fcc) structure at 580-700°C, 29 the Al 0.6 CoCrFeNi HEA with fcc and body-centered cubic (bcc) phases at 580-700°C, 29 the Ni 47.9 Al 10.2 Co 16.9 Cr 7.4 Fe 8.9 Ti 5.8 Mo 0.9 Nb 1.2 W 0.4 C 0.4 HEA with fcc 1 L1 2 phases at 750-982°C, 30 the Al 0.3 CoCrFeNi HEA with an fcc structure at room temperature, 31,32 the AlCoCrFeNi HEA with a bcc structure at room temperature, 32 the CoCrFeMnNi HEA with an fcc structure at room temperature, 33 the as-deposited CoCrFeCuNi HEA film with an fcc structure at room temperature, 34,35 the annealed CoCrFeCuNi HEA film with an fcc 1 bcc structure at room temperature, 34 the as-deposited CoCrFeCuNiAl 2.5 HEA film with a bcc structure at room temperature. 35 The creep response of these alloys at room temperature was mostly characterized by spherical nanoindentation tests 33,34 or Berkovich nanoindentation tests 31,32,35 by virtue of the highly localized stress field generated in these circumstances, whereas uniaxial creep tests 30 and stress-relaxation tests 29 were utilized for elevated-temperature probing. Focus was placed on determining the value of such critical material parameters as the stress exponent (n) and activation volume (V*), from which creep mechanisms are likely to be deduced.…”

Section: Introductionmentioning

confidence: 99%

Creep, fatigue, and fracture behavior of high-entropy alloys

Wang

et al. 2018

J. Mater. Res.

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Plastic Deformation of Al0.3CoCrFeNi and AlCoCrFeNi High-Entropy Alloys Under Nanoindentation

Cited by 58 publications

References 31 publications

High-Temperature Nano-Indentation Creep Behavior of Multi-Principal Element Alloys under Static and Dynamic Loads

High-Temperature Nano-Indentation Creep Behavior of Multi-Principal Element Alloys under Static and Dynamic Loads

Determination of the Mechanical Properties of PIN–PMN–PT Bulk Single Crystals by Nanoindentation

Creep, fatigue, and fracture behavior of high-entropy alloys

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