Tailoring grain size distribution for optimizing strength and ductility of multi-modal Zr

Shi, Yindong; Li, Ming; Guo, Defeng; Ma, Tengyun; Zhang, Zhibo; Zhang, Guosheng; Zhang, Xiangyi

doi:10.1016/j.matlet.2013.07.001

Cited by 23 publications

(8 citation statements)

References 12 publications

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“…We used experimental data of grain size distribution of alloys after severe plastic deformation to calibrate the computational model. The RVE can be created using the experimental data on grain structures obtained by the analysis of Electron Backscatter Diffraction (EBSD) based on scanning electron microscopy (SEM) [34][35][36]. This analysis gives quantitative information about sizes and shapes of grains, Euler angles, angles of misorientation at the grain/subgrain boundaries with angular resolution~0.5°.…”

Section: Computational Modelmentioning

confidence: 99%

Failure Mechanisms of Alloys with a Bimodal Graine Size Distribution

Skripnyak

2020

Springer Tracts in Mechanical Engineering

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A multi-scale computational approach was used for the investigation of a high strain rate deformation and fracture of magnesium and titanium alloys with a bimodal distribution of grain sizes under dynamic loading. The processes of inelastic deformation and damage of titanium alloys were investigated at the mesoscale level by the numerical simulation method. It was shown that localization of plastic deformation under tension at high strain rates depends on grain size distribution. The critical fracture stress of alloys depends on relative volumes of coarse grains in representative volume. Microcracks nucleation at quasi-static and dynamic loading is associated with strain localization in ultra-fine grained partial volumes. Microcracks arise in the vicinity of coarse and ultrafine grains boundaries. It is revealed that the occurrence of a bimodal grain size distributions causes increased ductility, but decreased tensile strength of UFG alloys. The increase in fine precipitation concentration results not only strengthening but also an increase in ductility of UFG alloys with bimodal grain size distribution.

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Section: Computational Modelmentioning

confidence: 99%

Failure Mechanisms of Alloys with a Bimodal Graine Size Distribution

Skripnyak

2020

Springer Tracts in Mechanical Engineering

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“…One approach that has been pursued to improve the ductility of UFG materials is the generation of bimodal microstructures . The general aim is to locally coarsen the microstructure via annealing to improve the strain hardening capability while keeping a high strength level from the remaining UFG volume fraction.…”

Section: Microstructural Effectsmentioning

confidence: 99%

“…shows that it strongly depends on the alloy whether bimodal microstructures result in a favorable combination of strength and ductility or not, thus, the promising results on copper cannot be transferred to a wide range of metals and alloys. Other investigations on bimodal microstructures are focused on which corresponding mechanical properties follow a rule of mixture and which do not, showing that the strength generally follows a rule of mixture whereas strain hardening behavior and uniform or total elongation can deviate from it depending on the alloy …”

Section: Microstructural Effectsmentioning

confidence: 99%

Formability of Ultrafine Grained Metals Produced by Severe Plastic Deformation–An Overview

Bruder

2018

Adv Eng Mater

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Severe plastic deformation (SPD) techniques have attracted considerable attention due to their capability to refine the grain size of metals and alloys down to the ultrafine grained (UFG) regime. A characteristic feature of SPD processes is that they generate semi-finished parts such as rods or sheets, which require further shaping in order to become marketable products. One approach for the shaping of SPD processed materials is the use of metal forming processes, which can be a challenge with regard to the low work hardening rate and tendency to strain localizations of most UFG metals. This article summarizes the current state of knowledge on the formability and forming behavior of UFG metals under different loading scenarios, discussing both limitations and application potential. Furthermore, the interaction between microstructural aspects and the formability, such as the occurrence of strain localizations during and the role of heat treatments are also addressed. Given that the formability of UFG metals has received far less attention than other aspects so far, this work also aims at identifying apparent contradictions as well as scientific and technological questions that need to be addressed in future to expand the current knowledge of the field.

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“…Its strength, resistance to corrosion and irradiation, high melting point and biocompatibility are attractive features for important applications in nuclear, aviation and surgical implant industries. Even though nanocrystalline materials exhibit higher yield strength and resistance to fatigue [1,2], more comprehensive studies in the relevant literature are limited to ultra-fine (around 100 nm or larger) grain sizes [3,4]. These studies addressed the challenges in the nanocrystalline materials preparation through severe plastic deformation, surface mechanical attrition treatment or cryo-rolling [5,6].…”

Section: Introductionmentioning

confidence: 99%

In-situ TEM mechanical testing of nanocrystalline zirconium thin films

2015

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a b s t r a c tMechanical behavior of nanocrystalline zirconium thin films was investigated in-situ inside a transmission electron microscope (TEM). The yield stress measured for specimens with o 10 nm grain size was around 450-500 MPa compared to the bulk value of 250-300 MPa. Similar grain size effects are seen on fracture stress and strain of about 0.9 GPa and 1.5-2% respectively. Using in-situ TEM, we demonstrate control of grain size in the specimens using electro-migration stress and temperature. The experimental results suggest that the critical grain size for inverse Hall-Petch type relationship in nanocrystalline hexagonal close packed metals could be around 15 nm.

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Tailoring grain size distribution for optimizing strength and ductility of multi-modal Zr

Cited by 23 publications

References 12 publications

Failure Mechanisms of Alloys with a Bimodal Graine Size Distribution

Failure Mechanisms of Alloys with a Bimodal Graine Size Distribution

Formability of Ultrafine Grained Metals Produced by Severe Plastic Deformation–An Overview

In-situ TEM mechanical testing of nanocrystalline zirconium thin films

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