High strain rate deformation and resultant damage mechanisms in ultrafine-grained aluminum matrix composites

Vogt, Rustin; Zhang, Z.; Huskins, Emily L.; Ahn, Byungmin; Nutt, Steven; Ramesh, K.T.; Lavernia, Enrique J.; Schoenung, Julie M.

doi:10.1016/j.msea.2010.05.092

Cited by 30 publications

(18 citation statements)

References 32 publications

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“…[1][2][3][4][5][6][7][8][9][10][11] In a drive to further enhance the properties of MMCs, recent research has focused on reducing the reinforcement particle size from the micrometric regime to submicron and nanometric length scales. [6,9] The strength and hardness of nanoparticle-reinforced composites have been extensively studied and the operative strengthening mechanisms have been thoroughly described [6,9,12,13] with the general finding that as the reinforcement particle size decreases, the strength of the composite increases.…”

Section: Introductionmentioning

confidence: 99%

Reinforcement Size Dependence of Load Bearing Capacity in Ultrafine-Grained Metal Matrix Composites

Yang

Balog

Krížik

et al. 2017

Metall Mater Trans A

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The length-scale effects on the load bearing capacity of reinforcement particles in an ultrafine-grained metal matrix composite (MMC) were studied, paying particular attention to the nanoscale effects. We observed that the nanoparticles provide the MMCs with a higher strength but a lower stiffness compared to equivalent materials reinforced with submicron particles. The reduction in stiffness is attributed to ineffective load transfer of the local stresses to the small and equiaxed nanoparticles.

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Section: Introductionmentioning

confidence: 99%

Reinforcement Size Dependence of Load Bearing Capacity in Ultrafine-Grained Metal Matrix Composites

Yang

Balog

Krížik

et al. 2017

Metall Mater Trans A

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“…However, processing techniques that involve work hardening improve physical properties as strength, typically achieved at the expense of ductility 9 . Several strategies have been developed to improve strength without sacrifice ductility in advanced metallic materials, mainly by the manipulation of microstructure, including the formation of a bimodal/multimodal grain size distribution 10 .…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Microstructural Characterization and Microhardness of AlCoNi-SiC Composite Prepared by Mechanical Alloying

et al. 2017

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Equiatomic AlCoNi alloy matrix were reinforced by the dispersion of SiC nanoparticles (SiCnp) using the mechanical alloying process. The metallic powders were milled for 10, 20 and 30 h and sintered at 1200 0C under vacuum. Through particle size distribution, X-ray diffraction and scanning electron microscopy investigations, the mechanically alloyed powders for 10 h were selected to be reinforced with SiCnp (2.5, 5 and 10 wt.%). The microstructural features, and improvement in microhardness and porosity of sintered AlCoNi-SiC composites were investigated as a function of SiCnp content. Microhardness Vickers test showed that the enhanced microhardness of the AlCoNi-SiCnp composite could be attributed to the decrease of porosity in comparison to the AlCoNi alloy.

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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%

“…Inspection of the published literature shows that the mechanical behavior of trimodal composites has been studied for the past decade [13][14][15]17,18]. A widely used matrix is Al-Mg partly due to the excellent balance of strength, weldability and corrosion resistance of this family of alloys [19].…”

Section: Introductionmentioning

confidence: 99%

“…This composite exhibited ultra-high compression yield strength of 1065 MPa. Early trimodal composites established themselves as attractive alternatives to conventional armor steel due to their excellent dynamic deformation behavior, with strain-to-failure of 14% at strain rates on the order of 10 3 s À1 and strength values as high as 1000 MPa [13,20]. However, widespread application of the early trimodal composites was restrained by their limited strain-to-failure (0.8%) when tested under quasi-static compression, and failure prior to yielding when tested under tensile loading.…”

Section: Introductionmentioning

confidence: 99%

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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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High strain rate deformation and resultant damage mechanisms in ultrafine-grained aluminum matrix composites

Cited by 30 publications

References 32 publications

Reinforcement Size Dependence of Load Bearing Capacity in Ultrafine-Grained Metal Matrix Composites

Reinforcement Size Dependence of Load Bearing Capacity in Ultrafine-Grained Metal Matrix Composites

Synthesis, Microstructural Characterization and Microhardness of AlCoNi-SiC Composite Prepared by Mechanical Alloying

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

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