Study on hot deformation behavior and workability of squeeze-cast 20 vol%SiCw/6061Al composites using processing map

Wang, Xu; Jin, Xueze; Xiong, Wendeng; Zeng, Xiangqian; Shan, Debin

doi:10.1016/j.matchar.2017.11.026

Cited by 43 publications

(9 citation statements)

References 44 publications

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“…Therefore, the high Q hw obtained in this study points to the interaction of mobile dislocations with the reinforcing particles in the composites during hot working. Similar reports have been made by Chen et al [11] and Xu et al [66]. Apart from the activation energy, the stress exponent could also give an indication of the mechanisms controlling the deformation process [24,66].…”

Section: Activation Energy For Hot Workingsupporting

confidence: 80%

“…Similar reports have been made by Chen et al [11] and Xu et al [66]. Apart from the activation energy, the stress exponent could also give an indication of the mechanisms controlling the deformation process [24,66]. Nix [24] reported that when the stress exponent values near 5, the deformation is strictly controlled by mobility of dislocation rather than dislocation substructure.…”

Section: Activation Energy For Hot Workingsupporting

confidence: 74%

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Hot deformation behaviour of bamboo leaf ash–silicon carbide hybrid reinforced aluminium based composite

et al. 2020

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Isothermal compression testing of BLA-SIC hybrid reinforced Aluminium composites was performed on Gleeble 3500 thermomechanical simulator under different deformation temperatures (300–400 °C) and strain rates (0.01–1 s‑1). The flow behaviour and the softening mechanisms were established using the trend of the stress-strain curves, activation energy and microstructural examination. The results showed that flow stress increased with decreasing temperature; but was not entirely strain rate sensitive − a characteristic identified in some Al 6XXX based metallic systems. Also, uncharacteristic flow stress oscillations were observed at strain rates of 0.01 and 0.1 s‑1 while steady state flow stress was observed at 1 s‑1. The hot working activation energy was ∼290.5 kJ/mol which was intermediate to the range of 111–509 kJ/mol reported in literature for various Al based composites. It was proposed that at strain rates of 0.01 and 0.1 s‑1, dynamic recrystallization and/or dislocations-reinforcements interactions were the dominant deformation mechanism(s), while at 1 s‑1, dynamic recovery was predominant.

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Section: Activation Energy For Hot Workingsupporting

confidence: 80%

Section: Activation Energy For Hot Workingsupporting

confidence: 74%

Hot deformation behaviour of bamboo leaf ash–silicon carbide hybrid reinforced aluminium based composite

et al. 2020

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“…The recrystallization can be triggered when the dislocation density around partial TiB 2 particles reaches the critical level during gradual deformations. However, the stress concentration around partial TiB 2 particles can be released by DRV, which hinders the initiation of PSN [ 47 ]. In the deformation process at low Z parameters, the climbing and diffusion of dislocation are enhanced, and thus dislocations can pass the particles to avoid accumulation and forming a dislocation wall [ 48 ].…”

Section: Discussionmentioning

confidence: 99%

“…On the other hand, the PM composites have fine initial grain size, which can give rise to a high fraction of grain boundaries and thus increase DRX kinetics to accelerate the onset of DRX during hot deformation [ 14 , 16 , 49 ]. In addition, the small grain size can reduce the migration distance of dislocations and subgrain boundaries, preventing the occurrence of local plastic flow [ 47 ]. As shown in Figure 9 a, the fine deformed grains consist of only 2–3 subgrains, suggesting that the fine initial grains are beneficial for the motion of dislocations.…”

Section: Discussionmentioning

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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“…It has been shown that coarse particles lead to grain refinement by particle stimulating nucleation (PSN) and fine particles by a Zener pining effect, may keep under control or avoid the recrystallization and even grain growth during deformation sequences [4][5][6]. Moreover, it has been found that microstructure evolution of metal matrix composites (MMCs) during hot deformation can be also accompanied by particle fracture, particle-matrix interface debonding, flow localization and instability, and matrix cracking [7][8][9]. It should be noted that although the second phase affects the microstructure evolution, it has been observed that the softening mechanisms of composites are similar to those of single phase alloys and they mainly depend on the deformation condition [5,10].…”

Section: Introductionmentioning

confidence: 99%

Microstructural investigation of Al-Mg/B4C composite deformed at elevated temperature

Rezayat

Parsa

Mirzadeh

et al. 2018

Journal of Alloys and Compounds

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The microstructure evolution of Al-3wt.%Mg reinforced with 10 vol.% B 4 C during isothermal compression at temperatures ranging 300 to 500 °C at strain rates of 0.001 to 10 s-1 was investigated by electron backscatter diffraction (EBSD). According to the results, at strain rates lower than 0.01 s-1 and temperatures higher than 400 °C , the grain size distribution in the microstructure is uniform, dynamic recovery is the predominant softening mechanism and continues recrystallization through lattice rotation is responsible for grain refinement. However, during deformation at higher strain rates or lower temperatures, deformation zones appeared in special locations around particles where microstructure is formed by recovered and hardened grains, and particle stimulating nucleation leaded to partially discontinues dynamic recrystallization which in turns promoted finer average grain and sub-grain size than those in single phase Al-Mg alloy. Moreover, it was found that the variation of grain and subgrain size with deformation parameters (Zener-Holloman parameter (Z)) can be described by a power law type equation rather than by an initially expected exponential expression.

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Study on hot deformation behavior and workability of squeeze-cast 20 vol%SiCw/6061Al composites using processing map

Cited by 43 publications

References 44 publications

Hot deformation behaviour of bamboo leaf ash–silicon carbide hybrid reinforced aluminium based composite

Hot deformation behaviour of bamboo leaf ash–silicon carbide hybrid reinforced aluminium based composite

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

Microstructural investigation of Al-Mg/B4C composite deformed at elevated temperature

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