Stress-induced grain growth during high-temperature deformation of nanostructured Al containing nanoscale oxide particles

Lin, Yaojun; Xu, Bocong; Feng, Yongzhao; Lavernia, Enrique J.

doi:10.1016/j.jallcom.2014.01.189

Cited by 22 publications

(7 citation statements)

References 49 publications

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“…Here, the slight reduction of dislocation density might be caused by the dislocation annihilation accompanied by strain-induced grain growth during warm deformation. [27,28] Due to the above-discussed limits of grain refinement and dislocation strengthening upon the processing conditions, the saturations of strength and hardness were shown in the current study when the rolling reduction ratio exceeded 70 pct. A similar saturation of strength was also observed in a previous study on ARB processing of commercially pure Ti when the number of ARB cycles exceeded seven.…”

Section: A Effects Of Rolling Reduction On Mechanical Behaviormentioning

confidence: 57%

“…The grain refinement in the alloy samples were supposed to be enhanced with increasing rolling reduction; however, the strain developed during rolling deformation at a temperature of 873 K (600°C) is likely to induce grain growth, and similar phenomena have been reported in various metals and composites. [27,28] After the grain size of the rolled alloy decreased to a certain value (which is within the ultrafine grain size level), grain growth and grain refinement are expected to attain steady state, in which the effective grain refinement is not significant. This insignificant grain refinement resulted in limited grain boundary strengthening (Dr GB ), which is lower than 20 MPa when the rolling reduction ratio increased from 70 pct (e vM = 1.4) to 90 pct (e vM = 2.7), as can be seen in Table III. The second likely cause for observation that the strength of Ti-6Al-4V remains relatively unchanged when the rolling reduction ratio increased from 70 to 90 pct is the slight reduction in dislocation densities as shown in Figure 5.…”

Section: A Effects Of Rolling Reduction On Mechanical Behaviormentioning

confidence: 99%

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Mechanical Behavior of Ultrafine-Grained Ti-6Al-4V Alloy Produced by Severe Warm Rolling: The Influence of Starting Microstructure and Reduction Ratio

Sun

Lavernia

et al. 2015

Metall Mater Trans A

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To provide insight into the mechanical behavior and microstructural evolution of bulk ultrafinegrained (UFG) Ti-6Al-4V alloys, we produced Ti-6Al-4V alloy sheets with grain size smaller than 300 nm through severe warm rolling of three different starting microstructures (i.e., lamellar, equiaxed, and hybrid, that is half equiaxed plus half lamellar microstructures) with various reduction ratios (i.e., 60, 70, 80, and 90 pct) at 873 K (600°C). Accordingly, the tensile behavior, microhardness, grain size, and dislocation density of the UFG Ti-6Al-4V alloys with different starting microstructures and reduction ratios were comparatively analyzed. Our results show that, following the continuous enhancement of tensile strength and hardness as the rolling reduction ratio increased from 0 to 70 pct, there was a saturation state in which the values of strength and hardness remained constant as the reduction ratio further increased from 70 to 90 pct for all the alloy samples with different starting microstructures. In terms of microstructural evolution, although grain size decreased and dislocation density increased continuously as the rolling reduction ratio increased from 0 to 70 pct, grain size and dislocation density did not change significantly when the reduction ratio further increased from 70 to 90 pct. Our results suggest that, whereas the starting microstructure influences the early stages of grain refinement and mechanical performance, this influence diminishes as the rolling reduction ratio is increased beyond a critical value. This behavior was rationalized on the basis of the limits of grain boundary and dislocation strengthening during severe warm rolling.

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Section: A Effects Of Rolling Reduction On Mechanical Behaviormentioning

confidence: 57%

Section: A Effects Of Rolling Reduction On Mechanical Behaviormentioning

confidence: 99%

Mechanical Behavior of Ultrafine-Grained Ti-6Al-4V Alloy Produced by Severe Warm Rolling: The Influence of Starting Microstructure and Reduction Ratio

Sun

Lavernia

et al. 2015

Metall Mater Trans A

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“…2), the matrix of nanocomposite samples consists of recrystallized nano/ultrafine grains. The true strain value in the hot extrusion process ( 2.3 mm/mm) is higher than the required critical strain for happening dynamic recrystallization in Al matrix ( 0.5 mm/mm) [17] and cause to occur the dynamic recrystallization during the hot extrusion process. In addition, the refined microstructure of the nanocomposites remained in the form of ultrafine / nano grains after hot extrusion at 580 ˚C.…”

Section: Microstructure Observationmentioning

confidence: 87%

Fabrication of Al/AlN in-situ nanocomposite through planetary ball milling and hot extrusion of Al/BN: Microstructural evaluation and mechanical behavior

Gostariani

Bagherpour

Rifai

et al. 2018

Journal of Alloys and Compounds

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In this study, Al/AlN in-situ nanocomposites were fabricated using Al/BN as the starting composite powders. The impact of adding hexagonal boron nitride (BN) to the Al matrix of commercial purity on the microstructure and mechanical behavior of the fabricated in-situ nanocomposites was investigated. Samples including 1, 2, and 4 wt.% boron nitride nanoparticles were produced by planetary ball milling of the composite powders and a post-process of hot extrusion. Scanning transmission electron microscopy revealed that boron nitride nanoparticles dissolved as a solid solution of B and N in the Al matrix at the as-milled state. Through the process of hot extrusion, AlN as the in-situ phase was formed by a reaction between Al and N. These led to improve the mechanical properties as well as grain refinement of Al/AlN nanocomposite. The average grain size of the fabricated composites with the use of 1, 2 and 4 wt.% BN was measured about 910, 823, and 760 nm respectively. It was found that combined strengthening mechanisms of grain refinement, a solid solution of mostly B and AlN in-situ phase formation improved the mechanical properties of Al/AlN nanocomposite. With the use of 1, 2, and 4 wt.% BN, the tensile strength of nanocomposite samples increased approximately 40, 56, and 57% in comparison with pure Al, respectively. The remarkable change in microstructure and mechanical properties of the nanocomposite was obtained when the content of BN is up to 2 wt.%.

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“…It is known that these properties significantly depend on the mechanisms of plastic deformation of such materials. For example, athermal migration of grain boundaries (GBs) under the action of an external load can lead to undesirable grain growth and, as a result, to degradation of the functional properties of NC metals [8][9][10][11][12][13][14][15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Collective Migration of Low-Angle Tilt Boundaries Near Crack Tips in Nanocrystalline Metals under Fatigue Load

Konakov¹,

Sheĭnerman²

2021

Rev Adv Mater Tech

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Stress-induced grain growth during high-temperature deformation of nanostructured Al containing nanoscale oxide particles

Cited by 22 publications

References 49 publications

Mechanical Behavior of Ultrafine-Grained Ti-6Al-4V Alloy Produced by Severe Warm Rolling: The Influence of Starting Microstructure and Reduction Ratio

Mechanical Behavior of Ultrafine-Grained Ti-6Al-4V Alloy Produced by Severe Warm Rolling: The Influence of Starting Microstructure and Reduction Ratio

Fabrication of Al/AlN in-situ nanocomposite through planetary ball milling and hot extrusion of Al/BN: Microstructural evaluation and mechanical behavior

Collective Migration of Low-Angle Tilt Boundaries Near Crack Tips in Nanocrystalline Metals under Fatigue Load

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