The design, microstructure and mechanical properties of B4C/6061Al neutron absorber composites fabricated by SPS

Chen, H.S.; Wang, W.X.; Li, Yuli; Zhou, Jun; Nie, Hongqi; Wu, Qiao

doi:10.1016/j.matdes.2016.01.030

Cited by 88 publications

(18 citation statements)

References 32 publications

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“…In addition, micro voids in the structure occurred as an inevitable consequence of the powder metallurgy method are another factor affecting the density. The increased amount of reinforcement and the micro voids in the structure are another reason for decreasing the density of B 4 C reinforced composites [8,11]. The weight loss and wear rate results of AMC materials produced by addition of the different amounts of B 4 C in the Al-Gr matrix.…”

Section: Resultsmentioning

confidence: 99%

“…Particle reinforced aluminum matrix composites (AMCs) are considered as a group of materials that can be developed due to their lightness, high strength, low thermal expansion coefficient and good wear resistance [1,2]. Different reinforcing elements such as SiC [3], Al 2 O 3 [4], TiB 2 [5,6], TiC [7] and B 4 C [8,9] are widely used in the production of these composites. Boron carbide (B 4 C), which is among the lightweight ceramic material groups, has high neutron absorbing characteristics as well as high melting temperature, high mechanical properties and good chemical resistance [8,10].…”

Section: Introductionmentioning

confidence: 99%

“…Different reinforcing elements such as SiC [3], Al 2 O 3 [4], TiB 2 [5,6], TiC [7] and B 4 C [8,9] are widely used in the production of these composites. Boron carbide (B 4 C), which is among the lightweight ceramic material groups, has high neutron absorbing characteristics as well as high melting temperature, high mechanical properties and good chemical resistance [8,10]. In contrast, B 4 C has significant disadvantages such as low fracture toughness and high sintering temperature have significant disadvantages.…”

Section: Introductionmentioning

confidence: 99%

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The Effect of B4C Amount on Wear Behaviors of Al-Graphite/B4C Hybrid Composites Produced by Mechanical Alloying

Şimşek

2019

Journal of Boron

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In this study, wear behavior of composite materials produced by mechanical alloying method adding different amounts of B 4 C in the Al-Gr matrix were investigated. After adding 2% (vol.) graphite to the aluminum matrix, 3 different amounts (3%, 6% and 9%) of B 4 C were added. The composite powders prepared were mechanically alloyed for 60 minutes. The milled powders were cold-pressed under 700 MPa pressure. The green compacts produced were sintered at 600 °C for 120 minutes. The sintered B 4 C reinforced aluminum composite materials were characterized by the Scanning Electron Microscope, X-ray diffraction, and hardness and density measurements. Wear tests were performed on a standard pin-on-disc wear testing device with a load of 20 N at a sliding speed of 0.5 ms -1 and four different sliding distances (between 250-1000 m) according to ASTM G99 standard. As a result of the studies, the hardness increases as the amount of B 4 C in the composite material increases, while the density of AMC decreases. As a result of the wear tests, the highest weight loss was obtained in the non-reinforced Al-Gr matrix alloy, while the lowest weight loss was obtained in 9% B 4 C reinforced composite materials. However, it was observed that there was a decrease in the friction coefficient with increasing amount of reinforcement.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The Effect of B4C Amount on Wear Behaviors of Al-Graphite/B4C Hybrid Composites Produced by Mechanical Alloying

Şimşek

2019

Journal of Boron

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“…One such process is hot isostatic pressing which exposed the reduction in attenuation rate upon sintering the composite shielding material at 650˚C with wealthy presence of B 4 C. On the other hand the phenomenal increase in B 4 Cwas reported to end with numerous porous sites in the material leading to less relative density of the material as well. Though it was found to have detrimental effects in the ability of the material to be sintered owing its deprived compatibility between the matrix and the reinforcement materials, but the tensile result was established to have an unique growth positively, conversely disclosed to be resulted with embrittlement of the material [44].However works have reported for the careful processing techniques for ensuring complete dispersion of B 4 C powders which ended up with zero agglomeration and aggregation of powder particles. One such method is ultrasonic sonication which results in complete mixture of powder particulates in the resin.…”

Section: Attenuation Studiesmentioning

confidence: 99%

Metallic Additives Dispersed Polymer Composites for Irradiation Shielding- A Novel Critique

2019

IJITEE

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Ionizing radiation finds its part in a wide spectrum of fields such as medicine, industry and research. These radiations in the form of alpha, beta, neutron particles, gamma and X-rays are very dangerous for not only humans but also for biotic and abiotic environments. The present article briefly works out the irradiation shielding ability of some potential composite materials to recognize the shielding tendency and enabling the same to find some promising applications in defense as well as nuclear research. The physics of irradiation decay and shielding is appraised in this critique. This review article studies about various materials employed for the attenuation of nuclear radiations and their response in terms of attenuation rates (I/I0 ) after exposure to the radiation. The study also focuses on the mechanical performance of the shielding materials meticulously for the application of dry storage of the spent fuel possessing a potential threat of radiation hazards. Moreover the evolution of composite materials in the structural applications is contemplated.

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“…Up to the present, the hot deformation behaviors of the TiAl based alloys except for the NG TiAl based alloys fabricated by the HPS technique, have been widely investigated [ 17 , 18 , 19 , 20 ], meanwhile, it is essential to investigate the hot deformation behavior and microstructure evolution of the sintered NG TiAl based alloys in order to obtain as-forged alloy with high-performance. Pulse current auxiliary isothermal forming [ 21 , 22 , 23 , 24 , 25 , 26 , 27 ] is a kind of efficient processing method with low energy consumption, and the pulse current can ensure a constant temperature in the forming process to avoid cracks caused by uneven distribution of temperature. However, few works have focused on investigating pulse current auxiliary isothermal forging (PCIF) of TiAl based alloys.…”

Section: Introductionmentioning

confidence: 99%

Hot Deformation Behavior and Pulse Current Auxiliary Isothermal Forging of Hot Pressing Sintering TiAl Based Alloys

2017

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This paper focuses on the fabrication of as-forged Ti46.5Al2Cr1.8Nb-(W, B) alloy via pulse current auxiliary isothermal forging (PCIF). The starting material composed of near gamma (NG) microstructure was fabricated by adopting pre-alloyed powders via hot pressing sintering (HPS) at 1300 °C. Isothermal compression tests were conducted at a strain rate range of 0.001–0.1 s−1 and a temperature range of 1125–1275 °C to establish the constitutive model and processing map. The optimal hot deformation parameters were successfully determined (in a strain rate range of 10−3–2.5 × 10−3 s−1 and temperature range of 1130–1180 °C) based on the hot processing map and microstructure observation. Accordingly, an as-forged TiAl based alloy without cracks was successfully fabricated by PCIF processing at 1175 °C with a nominal strain rate of 10−3 s−1. Microstructure observation indicated that complete dynamic recrystallization (DRX) and phase transformation of γ→α2 occurred during the PCIF process. The elongation of as-forged alloy was 136%, possessing a good secondary hot workability, while the sintered alloy was only 66% when tested at 900 °C with a strain rate of 2 × 10−4 s−1.

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The design, microstructure and mechanical properties of B4C/6061Al neutron absorber composites fabricated by SPS

Cited by 88 publications

References 32 publications

The Effect of B4C Amount on Wear Behaviors of Al-Graphite/B4C Hybrid Composites Produced by Mechanical Alloying

The Effect of B4C Amount on Wear Behaviors of Al-Graphite/B4C Hybrid Composites Produced by Mechanical Alloying

Metallic Additives Dispersed Polymer Composites for Irradiation Shielding- A Novel Critique

Hot Deformation Behavior and Pulse Current Auxiliary Isothermal Forging of Hot Pressing Sintering TiAl Based Alloys

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