Hybrid nanostructured aluminum alloy with super-high strength

Wang, Zhi; Qu, R.T.; Scudino, Sergio; Sun, B. A.; Prashanth, K.G.; Louzguine-Luzgin, Dmitri V.; Chen, Luyang; Zhang, Zhe F.; Eckert, J.

doi:10.1038/am.2015.129

Cited by 89 publications

(47 citation statements)

References 33 publications

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“…Compared to conventional coarse-grained Al alloys, the mechanical strength of which usually does not exceed 700 MPa, nanocrystalline Al-based alloys obtained from metallic glass precursors poses mechanical strengths that often reach values as high as 1 GPa [3,4]. Recently, a novel Al 84 Ni 7 Gd 6 Co 3 alloy with hybrid nanostructure and super-high mechanical strength up to ~1.8 GPa in compression has been developed [5], which is the highest strength ever reported for bulk Al-based alloys. The combination of exceptionally high strength and low density (~3.75 g cm -3 ) leads to excellent specific engineering properties, such as specific strength of 496 kNm kg -1 and specific Young's modulus of 32 MNm kg -1 .…”

Section: Introductionmentioning

confidence: 99%

Reciprocating sliding wear behavior of high-strength nanocrystalline Al 84 Ni 7 Gd 6 Co 3 alloys

Wang

Georgarakis

Zhang

et al. 2017

Wear

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Nanocrystalline Al-Ni-Gd-Co alloys with exceptionally high hardness have been recently developed from amorphous precursors. In the present work, the reciprocating sliding wear in the gross slip regime of these novel nanocrystalline Al-based alloys has been investigated under small amplitude oscillatory sliding motion using a martensitic chrome steel as the counter material. When compared to pure Al or Al-12Si alloy, these nanocrystalline alloys exhibit excellent wear resistance and a lower coefficient of friction when sliding against steel. The 2 enhanced wear resistance of the novel nanocrystaline Al alloys is related to their ultra-high hardness and the hybrid nanostructure that mainly consists of nanometric intermetallic phases embedded in a nanocrystalline fcc-Al matrix. Three body abrasive conditions were created at the initial stages of the wear tests due to the formation of micro-and nano-particulate debris from the worn surface of the Al alloys; the debris was compacted under the subsequent sliding cycles forming layers that are protective to the extensive wear of the Al alloys.

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Section: Introductionmentioning

confidence: 99%

Reciprocating sliding wear behavior of high-strength nanocrystalline Al 84 Ni 7 Gd 6 Co 3 alloys

Wang

Georgarakis

Zhang

et al. 2017

Wear

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“…Ceramic materials possess high hardness and relative low fracture toughness [44,45], and hence brittle micro-cutting wear mechanisms will predominate. However, sometimes plastic deformation may also be observed during an abrasion wear process [46].…”

Section: Abrasive Wear Studymentioning

confidence: 99%

Mechanical and Tribological Properties of Al2O3-TiC Composite Fabricated by Spark Plasma Sintering Process with Metallic (Ni, Nb) Binders

Kumar

Chaubey

Maity

et al. 2018

Metals

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Al 2 O 3 -10TiC composites were fabricated through the powder metallurgical process (mechanical milling combined with spark plasma sintering) with the addition of Ni/Nb as metallic binders. The effect of binder addition (Ni/Nb) on the processing, microstructure, and mechanical and tribological properties of the bulk-sintered composite samples was investigated. The microstructure of the composite reveals a homogeneous distribution of the TiC particles in the Al 2 O 3 matrix. However, the presence of Ni/Nb was not traceable, owing to the small amounts of Ni/Nb addition. Hardness and density of the composite samples increase with the increasing addition of Nb (up to 2 wt. % Nb). Any further increase in the Nb content (3 wt. %) decreases both the hardness and the wear resistance. However, in case of Ni as binder, both the hardness and wear resistance increases with the increase in the Ni content from 1 wt. % to 3 wt. %. However, the composite samples with Nb as binder show improved hardness and wear resistance compared to the composites with Ni as binder.

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“…During milling, severe plastic deformation occurred at the surface of the composite powders, which suffered high-energy impacts [34]. Severe plastic deformation also can occur, firstly at the surface of pure amorphous powder, and form a deformed surface layer [36]. Therefore, a deformed layer formed, and its thickness increased with increasing milling time.…”

Section: Mechanisms Of Morphology Developmentmentioning

confidence: 99%

“…Severe plastic deformation also can occur, firstly at the surface of pure amorphous powder, and form a deformed surface layer [36]. Therefore, a deformed layer formed, and its thickness increased with increasing milling time.…”

Section: Mechanisms Of Morphology Developmentmentioning

confidence: 99%

Formation of Nanoscale Metallic Glassy Particle Reinforced Al-Based Composite Powders by High-Energy Milling

Zhang

et al. 2017

Metals

Self Cite

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Abstract:The initial microstructure and mechanical properties of composite powders have a vital role in determining the microstructure and mechanical properties of the subsequent consolidated bulk composites. In this work, Al-based matrix composite powders with a dense and uniform distribution of metallic glass nanoparticles were obtained by high-energy milling. The results show that high-energy milling is an effective method for varying the microstructure and mechanical properties of the composite powders, thereby offering the ability to control the final microstructure and properties of the bulk composites. It was found that the composite powders show a deformed layer combined with an undeformed core after milling. The reinforcements, metallic glass microparticles, are fractured into dense distributed nanoparticles in the deformed layer, owing to the severe plastic deformation, while in the undeformed core, the metallic glass microparticles are maintained. Therefore, a bimodal structure was obtained, showing a mechanical bimodal structure that has much higher hardness in the outer layer than the center core. The hardness of the composite particles increases significantly with increasing milling time, due to dispersion strengthening and work hardening.

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Hybrid nanostructured aluminum alloy with super-high strength

Cited by 89 publications

References 33 publications

Reciprocating sliding wear behavior of high-strength nanocrystalline Al 84 Ni 7 Gd 6 Co 3 alloys

Reciprocating sliding wear behavior of high-strength nanocrystalline Al 84 Ni 7 Gd 6 Co 3 alloys

Mechanical and Tribological Properties of Al2O3-TiC Composite Fabricated by Spark Plasma Sintering Process with Metallic (Ni, Nb) Binders

Formation of Nanoscale Metallic Glassy Particle Reinforced Al-Based Composite Powders by High-Energy Milling

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