Hot deformation behaviors and processing maps of B4C/Al6061 neutron absorber composites

Li, Yuli; Wang, Wen Xian; Zhou, Jun; Chen, Hong sheng

doi:10.1016/j.matchar.2016.12.014

Cited by 42 publications

(12 citation statements)

References 34 publications

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“…Strain rate sensitivity index (m) is the factor that partitions the applied power between heat and microstructure evolution. The power dissipation efficiency η and the instability parameter , which are related to the work of hot deformation, can be expressed by the strain rate sensitivity m as follows (equations (11) and (13)) [34][35][36][37][38][39][40]:…”

Section: Processing Map Analysismentioning

confidence: 99%

Superplastic deformation behavior of ultra-fine-grained Ti-1V-4Al-3Mo alloy: constitutive modeling and processing map

Mosleh

Mikhaylovskaya

Котов

et al. 2019

Mater. Res. Express

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This paper studies the superplasticity of conventional sheets of Ti-1V-4Al-3Mo (α+β) alloy. The flow behavior was investigated in a temperature range of 775 °C-900 °C and a constant strain rate range of 2×10 −4-5×10 −3 s −1 via uniaxial tensile tests. The microstructure evolution during the superplastic deformation was analyzed. The results revealed that, the flow behavior of Ti-1V-4Al-3Mo (α+β) alloy is characterized by strain softening phenomena. The experimental stress-strain data were used to build a power law constitutive model. A processing map, which shows the safe and unsafe regions of deformation, was also constructed for the studied alloy. The optimal deformation regime was attained at a temperature of 875 °C and strain rate of 1×10 −3 s −1 which provided a β phase fraction of 52%. Equiaxed fine-grained α and β structure with size of 2-3 μm as well as dislocation activity inside the α-grains were identified in the optimum deformation regime.

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Section: Processing Map Analysismentioning

confidence: 99%

Superplastic deformation behavior of ultra-fine-grained Ti-1V-4Al-3Mo alloy: constitutive modeling and processing map

Mosleh

Mikhaylovskaya

Котов

et al. 2019

Mater. Res. Express

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“…Initially required amount of charge or matrix material was placed in a graphite crucible, which was placed in electric resistance furnace at a temperature of around 730 degree Celsius. After complete melting of A356 alloy matrix, degassing was carried out by using Solid Hexa Chloroethane [10], which helps to remove unwanted adsorbed gases from the melt. Once degassing is over, the preheated ceramic B 4 C reinforcement particles were introduced into matrix in a novel way which involves twostage additions of reinforcement during melt stirring [11].…”

Section: Preparation Of Compositesmentioning

confidence: 99%

A Comparative Study on Microstructure and Mechanical Properties of A356-B4c and A356-Graphite Composites

Jadhav¹,

Tjprc²

2018

IJMPERD

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“…Secondly, the particles could result in deformation instability (such as interface cracking, particle debonding and breakage) once the local stress near the interface exceeds the bonding strength of particles and matrices [ 11 ]. For instance, Li et al [ 12 ] reported that voids, at low temperatures and high strain rates, tended to be formed in the vicinity of interfaces between B 4 C particles and Al matrices. Thirdly, particle deformation zones with high stored energy are ideal sites for the recrystallization nucleus (this mechanism is widely known as particle-stimulated nucleation (PSN)), which promotes the local discontinuous dynamic recrystallization (DDRX) during thermo-mechanical processes [ 6 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

Hot Deformation Behavior and Workability of In-Situ TiB2/7050Al Composites Fabricated by Powder Metallurgy

Zhu

Liu

et al. 2020

Materials

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Isothermal compression tests of in situ TiB2/7050Al composites fabricated by powder metallurgy were performed at 300–460 °C with the strain rate varying from 0.001 s−1 to 1 s−1. The Arrhenius constitutive equation and hot processing map of composites were established, presenting excellent hot workability with low activation energies and broad processing windows. Dramatic discontinuous/continuous dynamic recrystallization (DDRX/CDRX) and grain boundary sliding (GBS) take place in composites during deformation, depending on the Zener-Hollomon parameter (Z) values. It was found that initially uniform TiB2 particles and fine grain structures are beneficial to the DDRX, which is the major softening mechanism in composites at high Z values. With the Z value decreasing, dynamic recovery and CDRX around particles are enhanced, preventing the occurrence of DDRX. In addition, fine grain structures in composites are stable at elevated temperature thanks to the pinning of dense nanoparticles, which triggers the occurrence of GBS and ensures good workability at low Z values.

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Hot deformation behaviors and processing maps of B4C/Al6061 neutron absorber composites

Cited by 42 publications

References 34 publications

Superplastic deformation behavior of ultra-fine-grained Ti-1V-4Al-3Mo alloy: constitutive modeling and processing map

Superplastic deformation behavior of ultra-fine-grained Ti-1V-4Al-3Mo alloy: constitutive modeling and processing map

A Comparative Study on Microstructure and Mechanical Properties of A356-B4c and A356-Graphite Composites

Hot Deformation Behavior and Workability of In-Situ TiB2/7050Al Composites Fabricated by Powder Metallurgy

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