A modified Taylor model for predicting yield strength anisotropy in age hardenable aluminium alloys

Mishra, Sumeet; Yadava, Manasij; Kulkarni, Kaustubh; Gurao, N.P.

doi:10.1016/j.msea.2017.05.062

Cited by 30 publications

(14 citation statements)

References 30 publications

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“…Considering β′′ precipitates as a representative case, their average spacing () can be expressed as [17] Here, and are the volume fraction and average radius of the precipitates, respectively. In our previous study [18], and in T6 condition are 0.008 ± 0.0006 and 1.5 ± 0.2 nm, respectively. Utilising these values, was estimated to be ∼43 nm, which is much smaller than the spacing of forest dislocations (for a typical forest dislocation density of 10 14 m −2 , the spacing will be 100 nm).…”

Section: Resultsmentioning

confidence: 84%

Effect of obstacle strength and spacing on the slope of Haasen plot

Mishra

Beura

Singh

et al. 2019

Materials Science and Technology

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The rate sensitivity of multiple obstacle aluminium alloy system was measured using the stress relaxation method. A discrepancy was observed between the slope of the Haasen plot (rate sensitivity of dislocation–dislocation interaction) in pure metals and in alloys strengthened by multiple obstacles. Considering a simplifying assumption of the constant obstacle force–distance profile, it is suggested that slope of the Haasen plot is governed by glide dislocations’ length taking part in a thermally activated event. The relative strength and spacing of obstacles (forest dislocations, solutes and precipitates) is proposed to affect the thermally activated dislocation length, which in turn manifests as the difference in slope of the Haasen plot.

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Section: Resultsmentioning

confidence: 84%

Effect of obstacle strength and spacing on the slope of Haasen plot

Mishra

Beura

Singh

et al. 2019

Materials Science and Technology

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“…Taylor factor is related to the crystallographic orientation and is defined as total slip amplitude corresponding to a unit macroscopic strain increase [49,50]. For plastically isotropic materials, Taylor factor is given by the following equation [51]…”

Section: Taylor Factor and Grain Fragmentationmentioning

confidence: 99%

A critical evaluation of microstructure-texture-mechanical behavior heterogeneity in high pressure torsion processed CoCuFeMnNi high entropy alloy

Sonkusare

Biswas

Al-Hamdany

et al. 2020

Materials Science and Engineering: A

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The present study aims to understand the evolution of textural and microstructural heterogeneity and its effect on evolution of mechanical properties of an equiatomic FCC CoCuFeMnNi high entropy alloy (HEA) disc subjected to high pressure torsion (HPT). HPT was performed on disc specimen with a hydrostatic pressure of 5 GPa for 0.1, 0.5, 1 and 5 turns at room temperature diffraction analysis shows decrease in crystalline size with simultaneous increase in dislocation density for five-turn HPT sample with increasing strain from centre to the periphery of the disc.Microstructural analysis using electron back scatter diffraction and transmission electron microscopy indicates extensive grain fragmentation (≈ 55 nm at the periphery of five-turn sample). The evolution of hardness from centre to the periphery of the disc cannot be explained only on the basis of evolution of grain size and dislocation density. The increase in contribution from solid solution strengthening due to partial dissolution of copper rich nano-clusters is expected to be the underlying cause for increase in the hardness. Thus, evolution of gradient microstructure, texture, and chemistry opens up new vistas for designing functionally graded materials for engineering materials.

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“…By combined controlling of ageing treatment and crystallographic texture, in age-hardenable aluminium alloys the anisotropy can be tailored [32]. In another study on Al-Mg-Si alloy sheet specimen, the variation in yield strength in different ageing conditions was determined by considering grain boundary, solid solution and shearable precipitate strengthening [33].…”

Section: In-plane Anisotropy In the Tensile Propertiesmentioning

confidence: 99%

In-plane anisotropy and tensile deformation behaviour of aluminium alloy AA 2014 forge plates

2019

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Plastic flow behaviour and fracture mechanism of aluminium alloy AA 2014 forged plates under tensile loading conditions are investigated and the results obtained are presented and discussed in the present study. The effects of heat treatment (namely, solution treatment and artificial ageing) on micro-structural homogeneity, tensile behaviour and nature of fracture were studied using hardness, tensile, optical and scanning electron microscopy methods. Experimental engineering stress-engineering strain and true stress-true strain data of the aluminium alloy AA 2014 in different ageing conditions have been analysed using Hollomon, Ludwik and Ludwigson plastic flow relationships. The alloy is found to exhibit moderate degree of in-plane anisotropy and anisotropic index. Further, the alloy in both solution-treated and aged conditions exhibits three different stages of strain-hardening rate and the highest strain-hardening rate occurs at regions of lower strain both in solution-treated and peak-aged conditions. It is also observed that the longitudinal specimen (L parallel to forging direction) exhibits higher strain hardening, while the specimen with T orientation exhibits lowest strain-hardening rates both in solution-treated and aged conditions. The alloy under study in all the heat treatment conditions exhibits ductile fracture mechanism with higher density of uniformly distributed macro-and micro-dimples.Keywords. Aluminium alloy AA 2014; in-plane anisotropy; strain hardening; fracture mechanism; anisotropic index; plastic flow. Sådhanå (2019) 44:22 Ó Indian Academy of Sciences https://doi.org/10.1007/s12046-018-0994-8S adhana(0123456789().,-volV)FT3 ](0123456789().,-volV)

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A modified Taylor model for predicting yield strength anisotropy in age hardenable aluminium alloys

Cited by 30 publications

References 30 publications

Effect of obstacle strength and spacing on the slope of Haasen plot

Effect of obstacle strength and spacing on the slope of Haasen plot

A critical evaluation of microstructure-texture-mechanical behavior heterogeneity in high pressure torsion processed CoCuFeMnNi high entropy alloy

In-plane anisotropy and tensile deformation behaviour of aluminium alloy AA 2014 forge plates

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