Mechanical behaviour of an Al–matrix composite reinforced with nanocrystalline Al-coated B<sub>4</sub>C particulates

Ye, J.; Han, Bing; Schoenung, Julie M.

doi:10.1080/09500830600986109

Cited by 40 publications

(23 citation statements)

References 24 publications

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“…A number of approaches, such as the introduction of coarse grains, precipitate particles and promoting twin formation, have been successfully used to enhance the ductility of nanocrystalline materials [12]. Another approach involves the development of trimodal metal matrix composites, which consist of a coarse grained (CG) structure (larger than 1 lm grain size), an ultrafine-grained (UFG) structure, and micron-sized B 4 C reinforcement particles [13][14][15][16]. The CG structure is employed to provide ductility, while the UFG structure facilitates grain boundary strengthening due to, e.g., the Hall-Petch relationship.…”

Section: Introductionmentioning

confidence: 99%

Metal/ceramic interface structures and segregation behavior in aluminum-based composites

Zhang

Rufner

et al. 2015

Acta Materialia

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a b s t r a c tTrimodal Al alloy (AA) matrix composites consisting of ultrafine-grained (UFG) and coarse-grained (CG) Al phases and micron-sized B 4 C ceramic reinforcement particles exhibit combinations of strength and ductility that render them useful for potential applications in the aerospace, defense and automotive industries. Tailoring of microstructures with specific mechanical properties requires a detailed understanding of interfacial structures to enable strong interface bonding between ceramic reinforcement and metal matrix, and thereby allow for effective load transfer. Trimodal AA metal matrix composites typically show three characteristics that are noteworthy: nanocrystalline grains in the vicinity of the B 4 C reinforcement particles; Mg segregation at AA/B 4 C interfaces; and the presence of amorphous interfacial layers separating nanocrystalline grains from B 4 C particles. Interestingly, however, fundamental information related to the mechanisms responsible for these characteristics as well as information on local compositions and phases are absent in the current literature. In this study, we use high-resolution transmission electron microscopy, energy-dispersive X-ray spectroscopy, electron energy-loss spectroscopy, and precession assisted electron diffraction to gain fundamental insight into the mechanisms that affect the characteristics of AA/B 4 C interfaces. Specifically, we determined interfacial structures, local composition and spatial distribution of the interfacial constituents. Near atomic resolution characterization revealed amorphous multilayers and a nanocrystalline region between Al phase and B 4 C reinforcement particles. The amorphous layers consist of nonstoichiometric Al x O y , while the nanocrystalline region is comprised of MgO nanograins. The experimental results are discussed in terms of the possible underlying mechanisms at AA/B 4 C interfaces.

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Section: Introductionmentioning

confidence: 99%

Metal/ceramic interface structures and segregation behavior in aluminum-based composites

Zhang

Rufner

et al. 2015

Acta Materialia

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“…[24][25][26][27][28] Generally, well-bonded interfaces with coherency or semicoherency favor good mechanical properties, whereas interfaces with incoherency, especially with the presence of brittle intermetallic phases like Al 4 C 3 at the interfaces, do not favor these properties. [9][10][11][12][13] The purpose of this article is to study the interfacial microstructure in the pressureless infiltrated B 4 C/Al composite through detailed electron microscopic investigations.…”

Section: Introductionmentioning

confidence: 99%

Interfacial Microstructure in a B4C/Al Composite Fabricated by Pressureless Infiltration

Luo

Song

Zhang

et al. 2011

Metall Mater Trans A

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In this work, B 4 C particulate-reinforced Al composite was fabricated by a pressureless infiltration technique, and its interfacial microstructure was studied in detail by X-ray diffraction as well as by scanning and transmission electron microscopy. The B 4 C phase was unstable in Al melt during the infiltration process, forming AlB 10 -type AlB 24 C 4 or Al 2.1 B 51 C 8 as a major reactant phase. The Al matrix was large grains (over 10 lm), which had no definite orientation relationships (ORs) with the randomly orientated B 4 C or its reactant particles, except for possible nucleation sites with f011g B 4 C almost parallel to {111} Al at a deviation angle of 1.5 deg. Both B 4 C-Al and reactant-Al interfaces are semicoherent and free of other phases. A comparison was made with the SiC/Al composite fabricated similarly by the pressureless infiltration. It was suggested that the lack of ORs between the Al matrix and reinforced particles, except for possible nucleation sites, is the common feature of the composites prepared by the infiltration method.

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“…Various techniques have been developed to coat the surfaces of reinforcing particles, such as chemical vapor deposition (CVD), [9] physical vapor deposition (PVD), sol-gel processes, thermal spraying, electroplating, [2,5] and cryomilling. [10] In the present study, Ni-coated TiC particles were used as a reinforcement phase in Ti-based MMCs. The coating technique used in the present study yielded a nanoscale metal coating on the ceramic particles; more details are described in subsequent sections.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Properties of Laser-Deposited Ti6Al4V Metal Matrix Composites Using Ni-Coated Powder

Zheng

Smugeresky

Zhou

et al. 2008

Metall Mater Trans A

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As a layer additive rapid manufacturing process, laser engineered net shaping (LENS) can fabricate three-dimensional components directly from a computer-aided design (CAD) model. In this work, the LENS process was employed to fabricate Ti6Al4V metal matrix composites using powder mixtures of gas-atomized Ti6Al4V powder and varying volume fractions of Ni nanocoated TiC particles. The as-fabricated microstructures were studied using scanning electron microscopy (SEM), X-ray energy-dispersive spectroscopy (EDS), X-ray diffraction (XRD), differential thermal analyzer (DTA), and transmission electron microscopy (TEM) techniques. The interfaces between the metal matrix and ceramic particles were examined. The presence of intermetallic phases and resolidified TiC particles was rationalized on the basis of the thermal field during deposition. The influence of LENS parameters on the microstructure evolution and mechanical behavior of the metal matrix composites (MMCs) was also discussed.

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Mechanical behaviour of an Al–matrix composite reinforced with nanocrystalline Al-coated B₄C particulates

Cited by 40 publications

References 24 publications

Metal/ceramic interface structures and segregation behavior in aluminum-based composites

Metal/ceramic interface structures and segregation behavior in aluminum-based composites

Interfacial Microstructure in a B4C/Al Composite Fabricated by Pressureless Infiltration

Microstructure and Properties of Laser-Deposited Ti6Al4V Metal Matrix Composites Using Ni-Coated Powder

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Mechanical behaviour of an Al–matrix composite reinforced with nanocrystalline Al-coated B4C particulates

Cited by 40 publications

References 24 publications

Metal/ceramic interface structures and segregation behavior in aluminum-based composites

Metal/ceramic interface structures and segregation behavior in aluminum-based composites

Interfacial Microstructure in a B4C/Al Composite Fabricated by Pressureless Infiltration

Microstructure and Properties of Laser-Deposited Ti6Al4V Metal Matrix Composites Using Ni-Coated Powder

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Mechanical behaviour of an Al–matrix composite reinforced with nanocrystalline Al-coated B₄C particulates