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Viala, J.C.; Bouix, J.; González, Ginés López; Esnouf, C.

doi:10.1023/a:1018625402103

Cited by 266 publications

(104 citation statements)

References 27 publications

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“…1). In the non-reactive Al 2 O 3 -Al system no third phases were observed while small amounts of the reaction product, AlB 2 , were identified in the B 4 CAl composites [48].…”

Section: Composite Structure and Propertiesmentioning

confidence: 93%

Quantification of microdamage phenomena during tensile straining of high volume fraction particle reinforced aluminium

et al. 2001

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Abstract-Particle reinforced composites are produced by infiltrating ceramic particle beds with 99.99% Al. Resulting materials feature a relatively high volume fraction (40-55 vol. pct) of homogeneously distributed reinforcement. The evolution of damage during tensile straining of these composites is monitored using two indirect methods; namely by tracking changes in density and in Young's modulus. Identification and quantification of the active damage mechanisms is conducted on polished sections of failed tensile specimens; particle fracture and void formation in the matrix are the predominant damage micromechanisms in these materials. The damage parameter derived from the change in density at a given strain is found to be one to two orders of magnitude smaller than the parameter based on changes in Young's modulus. A simple micromechanical analysis inspired by the observed damage micromechanisms is used to correlate the two indirect measurements of damage. The predictions of this analysis are in good agreement with experiment.

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“…1). In the non-reactive Al 2 O 3 -Al system no third phases were observed while small amounts of the reaction product, AlB 2 , were identified in the B 4 CAl composites [48].…”

Section: Composite Structure and Propertiesmentioning

confidence: 93%

Quantification of microdamage phenomena during tensile straining of high volume fraction particle reinforced aluminium

et al. 2001

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“…and 3) its commercial availability in large quantities. Also this composite can be used in high performance application such as aircrafts and aerospace structures, medical applications etc [Viala et al, 1997;Chen, 2005].…”

Section: The Statement Of the Problemmentioning

confidence: 99%

“…Later it has been proposed that secondary reactions phases AI3BC and AIB2 formed by following equation [Zhang et al, 2008a;Zhang et al, 2007;Viala et al, 1997].…”

Section: Addition Of Titaniummentioning

confidence: 99%

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Investigation on wetting of B4C by aluminum alloys /

Sarkar¹

2009

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Aluminum-B4C composites (MMC) gained importance in aluminum industry because it can be used in high performance applications such as radioactive nuclear waste storage, aircraft and aerospace structures due to its neutron shielding capacity, light weight, high strength, and stiffness. It is difficult to mix B4C powder with liquid aluminum to produce composites due to poor wettability of B4C. In addition, B4C is not stable when it is in contact with aluminum. The optical microscopy and scanning electron microscopy analyses of the interface revealed the formation of AI3BC and AÎB2 particles around the B4C particle. This reaction is continuous and results in the depletion of B4C concentration, decrease in the fluidity of the melt, and deterioration in its mechanical and physical properties. To prevent B4C loss, titanium is added to aluminum. Ti has affinity to react with B4C and forms a protective layer around the particle.Objectives of this project are to investigate the wettability of B4C/aluminum and B4C/aluminum-titaniurn alloy systems, and to identify other potential alloying elements to protect B4C. The sessile-drop experiments have been conducted to measure the contact angles of B4C as well as those of the interfacial reaction products forming due to the presence of alloying elements in aluminum. Also, the effect of Ti content on the wettability of B4C by aluminum was studied.The results of the experiments show that the titanium and zirconium addition to aluminum has a strong positive effect on wetting between B4C particles and the liquid metal. In order to understand the effects of the reaction products on wetting, the contact angles between the reaction products (TiC, T1B2, AIB2 and AI4C3 particles) and aluminum have been measured at 750°C and 850°C. The results also show that wetting increases with increasing temperature and contact time.It is found out that with Ti addition, AIB2 particles disappear and new Ti-rich needle-like particles (TiB?) are formed around the B4C particles. These act as a barrier layer which isolates the B4C from the aluminum matrix. It is also observed that with increasing Ti content, the formation of AI3BC decreases. However, further increase in Ti content causes

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“…In contrast, some chemical reactivity exists between molten aluminium and B 4 C [53][54][55]; however, reaction phases can be kept to very small quantities by controlling contact time between molten Al and the B 4 C particles [56]. Typical microstructures for the three types of composites are given in Fig.…”

Section: Materials Processing and Designationmentioning

confidence: 99%

Fracture of aluminium reinforced with densely packed ceramic particles: link between the local and the total work of fracture

Miserez

2004

Acta Materialia

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Model composites of pure Al reinforced with 50% ceramic particles are produced by infiltration. The composite fracture energy is measured by J -integral testing. Marked R-curve behaviour is found. The J-R curves exhibit a break in their slope at a well-defined point. This point is shown to denote the onset of macroscopic crack propagation and is used to assess the composite toughness.Toughness reaches values as high as 40 MPa ffiffiffiffi m p . Quantitative metallography and stereoscopic reconstructions of fracture surfaces are used to estimate the local work of fracture in the process zone. The measured (total) fracture energy is about ten times the estimated local fracture energy, for all composites. The main contribution to their total fracture energy is thus from plastic dissipation around the crack-tip; however, the toughness is still dictated by the local fracture energy. This study hence experimentally substantiates the ''valve'' concept in fracture mechanics.

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Cited by 266 publications

References 27 publications

Quantification of microdamage phenomena during tensile straining of high volume fraction particle reinforced aluminium

Quantification of microdamage phenomena during tensile straining of high volume fraction particle reinforced aluminium

Investigation on wetting of B4C by aluminum alloys /

Fracture of aluminium reinforced with densely packed ceramic particles: link between the local and the total work of fracture

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