Journal ArticleDOI
Improving ductility of bimodal carbon nanotube/2009Al composites by optimizing coarse grain microstructure via hot extrusion
TLDR
In this article, a bimodal carbon nanotube reinforced 2009Al (CNT/2009Al) composites were fabricated by powder metallurgy followed with extrusion.Abstract:
Bimodal carbon nanotube reinforced 2009Al (CNT/2009Al) composites were fabricated by powder metallurgy followed with extrusion. It indicated that the width, length and grain size in the coarse grain (CG) bands increased with the increase of the extrusion temperature, while no obvious grain size change was observed in the ultra-fine grain zones. The bimodal composite showed a double yield phenomenon. The first yield strength which resulted from the yielding of the CG, was similar for all composites extruded with different temperatures. The second yield strength decreased, but the ultimate tensile strength retained stable and the elongation increased with increasing the extrusion temperature. The composite extruded at 470 °C exhibited a 76% ductility increase with nearly no ultimate tensile strength loss as compared to one extruded at 370 °C. The better stress relaxation ability of large-sized grains in the CG bands was believed to be the reason for the good strength-ductility.read more
Citations
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Fabrication and the mechanical and physical properties of nanocarbon-reinforced light metal matrix composites: A review and future directions
Fumio Ogawa,Chitoshi Masuda +1 more
TL;DR: In this article, a literature review on the fabrication process of nanocarbon-reinforced light metal matrix composites (LMMCs), where “nanocarbon” refers to carbon nanofibers (CNFs), carbon nanotubes (CNTs), and graphene nanoplatelets (GNPs), is presented.
Journal ArticleDOI
Structure optimization for improving the strength and ductility of heterogeneous carbon nanotube/Al–Cu–Mg composites
TL;DR: In this paper, the grain size and width of the DZs in the heterogeneous composites could be controlled by high energy ball milling (HEBM) on additional Al-Cu-Mg alloy powders.
Journal ArticleDOI
Powder assembly & alloying to CNT/Al–Cu–Mg composites with trimodal grain structure and strength-ductility synergy
TL;DR: In this paper, a powder assembly and alloying strategy was used to achieve trimodal grain structure in carbon nanotubes (CNTs) reinforced aluminum matrix composites.
Journal ArticleDOI
Micro/nano-reinforcements in bimodal-grained matrix: A heterostructure strategy for toughening particulate reinforced metal matrix composites
TL;DR: A powder assembly was developed to fabricate micro B4Cp/6061Al composites, which features UFG/CG matrices containing ex/in-situ nano dispersoids and exhibits superior combination of strength and ductility as discussed by the authors .
Journal ArticleDOI
Deformation behavior and strengthening mechanisms in a CNT-reinforced bimodal-grained aluminum matrix nanocomposite
TL;DR: In this article, the authors identify deformation behavior and strengthening mechanisms of a carbon nanotube (CNT)-reinforced bimodal-grained Al-Cu-Mg nanocomposite and its base alloy fabricated by two-step ball milling, powder metallurgy and extrusion.
References
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On the ductile enlargement of voids in triaxial stress fields
James R. Rice,D.M. Tracey +1 more
TL;DR: In this article, a variational principle is established to characterize the flow field in an elastically rigid and incompressible plastic material containing an internal void or voids, and an approximate Rayleigh-Ritz procedure is developed and applied to the enlargement of an isolated spherical void in a nonhardening material.
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Recent progress in the development and properties of novel metal matrix nanocomposites reinforced with carbon nanotubes and graphene nanosheets
Sie Chin Tjong,Sie Chin Tjong +1 more
TL;DR: In this article, the authors focus on the recent development in the synthesis, property characterization and application of aluminum, magnesium, and transition metal-based composites reinforced with carbon nanotubes and graphene nanosheets.
Journal ArticleDOI
Review on superior strength and enhanced ductility of metallic nanomaterials
TL;DR: In this article, the authors present an overview of experimental data and theoretical concepts addressing the unique combination of superior strength and enhanced ductility of metallic nanomaterials, and consider the basic approaches and methods for simultaneously optimizing their strength and ductility, employing principal deformation mechanisms, crystallographic texture, chemical composition as well as second-phase nano-precipitates, carbon nanotubes and graphene.
Journal ArticleDOI
Combination of hot extrusion and spark plasma sintering for producing carbon nanotube reinforced aluminum matrix composites
TL;DR: In this paper, an aluminum and carbon nanotube (CNT) composites with nanoscale dispersion and regular orientation of the CNTs were fabricated by a combination of some advanced powder processes.
Journal ArticleDOI
Eight routes to improve the tensile ductility of bulk nanostructured metals and alloys
TL;DR: In this article, the authors present a review of recent progress in tailoring the nanostructure to achieve coexisting high strength and high ductility at room temperature, focusing on a summary of the strategies currently being pursued as well as the outstanding issues that await future research.