Grain Boundary Processes in Strengthening, Weakening, and Superplasticity

Chokshi, Atul H.

doi:10.1002/adem.201900748

Cited by 50 publications

(28 citation statements)

References 66 publications

(111 reference statements)

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“…2(b)), ZH parameter (determined from y-intercept) is 1.11e ( 14) and apparent creep activation energies (determined from slope of ln(strain rate, in h) vs 1/T plot) vary from 364.77 kJ/mol in regime 1 to 377.68 kJ/mol in regime 2. Regimes 1 and 2 are sequential [36].…”

Section: At 1034 Mpamentioning

confidence: 99%

A brief discussion on the tensile creep deformation behaviour of wrought single-phase γ-TiAl

Saha

2021

Materials Today: Proceedings

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Creep deformation behaviour in single phase c-TiAl alloy has been an extensively studied topic since the late 1970 s. A lot of literatures have reported creep behaviour of c-TiAl alloys, manufactured using different processing techniques [1][2][3][4][5][6][7]. The present discussion revisits the original work on understanding the tensile creep deformation behaviour of wrought single-phase c-TiAl alloy by Hayes et al. [8] and is aimed to develop an understanding of steady state creep, through strain vs strain rate and strain vs ln(strain rate) plots. Besides, it also attempts to study the variation of stress exponent with temperature between 760 and 900⁰C and also, to determine activation energies using the two most common approaches, namely: Zener-Hollomon (Z-H) [9] and Sherby-Dorn (S-D, temperature compensated time approach) [10] for stress levels of 69.4 and 103.4 MPa between 760 and 900⁰C.

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Section: At 1034 Mpamentioning

confidence: 99%

A brief discussion on the tensile creep deformation behaviour of wrought single-phase γ-TiAl

Saha

2021

Materials Today: Proceedings

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“…Accordingly, the concurrent process of GBS and GBS being accommodated by intragranular dislocation and the generation of GNDs come together to contribute to the record elongation by postponing the initiation of cracks at interphase boundaries. A detailed survey on the superplasticity of HEAs shows that the accommodation of GBS by dislocation activity is rather limited 43 .…”

Section: Resultsmentioning

confidence: 99%

Ultrahigh high-strain-rate superplasticity in a nanostructured high-entropy alloy

et al. 2020

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Superplasticity describes a material's ability to sustain large plastic deformation in the form of a tensile elongation to over 400% of its original length, but is generally observed only at a low strain rate (~10 −4 s −1), which results in long processing times that are economically undesirable for mass production. Superplasticity at high strain rates in excess of 10 −2 s −1 , required for viable industry-scale application, has usually only been achieved in low-strength aluminium and magnesium alloys. Here, we present a superplastic elongation to 2000% of the original length at a high strain rate of 5 × 10 −2 s −1 in an Al 9 (CoCrFeMnNi) 91 (at%) highentropy alloy nanostructured using high-pressure torsion. The high-pressure torsion induced grain refinement in the multi-phase alloy combined with limited grain growth during hot plastic deformation enables high strain rate superplasticity through grain boundary sliding accommodated by dislocation activity.

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“…The Hall–Petch relation is usually used to illustrate the effect of grain size on yield stress and is given as [ 31 ]:

where

is the yield stress,

is a friction stress,

is the grain size and

is a constant.…”

Section: Resultsmentioning

confidence: 99%

Influence of Plastic Deformation on Microstructural Evolution of 100Cr6 Bearing Ring in Hot Ring Rolling

2020

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The hot ring rolling technology as the crucial procedure for the manufacture of bearing rings plays an important role in determining the final microstructure of bearing rings. In this work, the influence of the hot ring rolling process on the microstructural evolution of 100Cr6 bearing rings was investigated using a three-dimensional (3D) numerical model and microstructural characterization. It was found that the significant microstructural refinement occurs at the different regions of the rings. However, owing to the non-uniform plastic deformation of hot rolling, the refinement rate of grain size and decrease of pearlite lamellar spacing (PLS) also showed uniformity at different regions of the rings. Furthermore, the degree of grain refinement had been limited with the increase of rolling reduction. Due to the refined grain size and decreased PLS, the Vickers hardness increased with the increase of rolling reduction. Moreover, the Vickers hardness from the outer surface to the inner surface of the ring is asymmetrical u-shaped, which had the law of lower hardness in the center area and higher hardness on the surface.

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Grain Boundary Processes in Strengthening, Weakening, and Superplasticity

Cited by 50 publications

References 66 publications

A brief discussion on the tensile creep deformation behaviour of wrought single-phase γ-TiAl

A brief discussion on the tensile creep deformation behaviour of wrought single-phase γ-TiAl

Ultrahigh high-strain-rate superplasticity in a nanostructured high-entropy alloy

Influence of Plastic Deformation on Microstructural Evolution of 100Cr6 Bearing Ring in Hot Ring Rolling

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