Age Hardening of Extruded AA 6005A Aluminium Alloy Powders

Feijoó, I.; Cabeza, M.; Merino, P.; Peña, G.; Rey, P.

doi:10.3390/ma12142316

Cited by 7 publications

(3 citation statements)

References 43 publications

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“…In most cases, the method of cold uniaxial pressing [51][52][53][54] is employed to create green samples. A critical aspect in both the theory and practice of cold uniaxial powder pressing is the determination of experimental relationships between the applied pressure and the density of the resulting green sample.…”

Section: Introductionmentioning

confidence: 99%

Compactability Regularities Observed during Cold Uniaxial Pressing of Layered Powder Green Samples Based on Ti-Al-Nb-Mo-B and Ti-B

Bazhin,

Konstantinov,

Chizhikov

et al. 2023

Metals

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We determined the compactability regularities observed during the cold uniaxial pressing of layered powder green samples, taking into account factors such as composition, height, and number of Ti–B (TiB) and Ti–Al–Nb–Mo–B (TNM) layers. The following composition was chosen for the TNM layer at %: 51.85Ti–43Al–4Nb–1Mo–0.15B, while for the Ti-B layer we selected the composition wt %: Ti-B-(20, 30, 40) Ti. Green samples were made containing both 100 vol % TiB and TNM, and those taken in the following proportions, vol %: 70TiB/30TNM, 50TiB/50TNM, 30TiB/70TNM; multilayer green samples were studied in the following proportions, vol %: 35TiB/30TNM/35TiB, 25TiB/25TNM/25TiB/25TNM, 35TNM/30TiB/35TNM. Based on the obtained rheological data, we determined the rheological characteristics of the layered green samples, including compressibility modulus, compressibility coefficient, relaxation time, and limiting value of linear section deformation. These characteristics were found to vary depending on the composition, height, and number of layers. Our findings revealed that reducing the TNM content in the charge billet composition improves the compaction of powder materials under the given technological parameters of uniaxial cold pressing. Moreover, we observed that increasing the boron content and decreasing the amount of titanium in the Ti–B composition enhances the compactability of powder materials. We also established a relationship between the compaction pressure interval and the density of the layered powder green sample.

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Section: Introductionmentioning

confidence: 99%

Compactability Regularities Observed during Cold Uniaxial Pressing of Layered Powder Green Samples Based on Ti-Al-Nb-Mo-B and Ti-B

Bazhin,

Konstantinov,

Chizhikov

et al. 2023

Metals

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“…Aluminium is considered an ideal metal matrix for lightweight, high-strength composites, which are widely applied in the automotive and aerospace industries [1]. In recent decades, aluminium matrix composites (AlMCs) have been reinforced with ceramic particles, such as TiC, SiC, Al 2 O 3 , Y 2 O 3 , AlN, Si 3 N 4 and TiB 2 , in order to improve properties such as strength at elevated temperature, fatigue performance, elastic stiffness and wear resistance [2][3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Effect of Carbon Nanotube Content and Mechanical Milling Conditions on the Manufacture of AA7075/MWCNT Composites

Feijoó

Peña

Cristóbal

et al. 2022

Metals

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Aluminium matrix composites (AlMCs) of AA7075 aluminium alloy reinforced with 0.5 and 1 wt.% multiwall carbon nanotubes (MWCNTs) were fabricated with powder metallurgy techniques using three different mechanical milling strategies, varying the milling energy and the stage in which the reinforcements were added to the pre-alloyed matrix powders. In this paper, we focus on the influence of these parameters on the dispersion of MWCNTs. Characterization of the obtained composite powders by X-ray diffraction and scanning electron microscopy showed that the evolution of the particle size and morphology of the composite powders is influenced by milling conditions and MWCNT content; however, under the conditions tested in this study, there were no significant differences in crystallite size and lattice strain. The best distribution of the reinforcements was obtained after milling 7075 powders and MWCNTs in a high-energy cycle (HEBM), varying the rotation speed between 1200 and 1300 rpm. Raman spectroscopy was used to assess the damage induced by the milling process in the nanotubes, and no reaction products were detected under any of the tested conditions. Nanoindentation tests were performed to measure the elastic modulus and hardness of the composite powders, revealing that the best mechanical behaviour was achieved by the 7075-0.5 wt.% MWCNT composites obtained by the HEBM route.

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“…The replacement of ferrous metals with lighter non-ferrous ones, in particular with aluminum and its alloys, is of great importance for reducing the specific material consumption of products. According to [1] analyzed that the use of aluminum alloys in industry is increasing thanks to their structural strength, increased plasticity, and optimal cost. However, the expansion of the scope of practical use of aluminum alloys for the manufacture of body parts and various friction pairs is prevented by the failure to meet the high technological requirements for the performance characteristics because of their insufficient hardness and low wear resistance.…”

Section: Introductionmentioning

confidence: 99%

Influence of Continuity of Electric Spark Coatings on Wear Resistance of Aluminum Alloy

Al-Quraan¹,

Мнацаканов²,

Токарук³

et al. 2021

Tribol. Ind.

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The replacement of ferrous metals with lighter non-ferrous ones, in particular with aluminum and its alloys, is of great importance for reducing the specific material consumption of products. Modification of aluminum alloy D16 with combined electro spark coating VK8 + Cu is considered. Based on the method of finite element analysis of the Nastran software complex, an optimal coating continuity was determined at the level of 55 -65%, which provides efficient workability of the coating via reducing the residual stresses in the base and tangent stresses in the plane of adhesive contact, optimization of the coating continuity, distribution of contact loads, and formation of optimal surface geometry. The results of modeling the stress-strain state of the coating-base at a coating continuity of 60% and a normal load of 600 N indicate a 30 MPa increase in equivalent stresses in a unit element of the coating and a decrease of this parameter by 100 MPa in the base as compared with an unmodified D16 surface, indicating the localization of normal stresses mainly in the combined coating. It was experimentally established that at a combined coating continuity of 60%, reduction of D16 wear by 2 times and decrease in the average power of acoustic emission by 1.33 times are provided, which testifies to the efficient structural adaptability of the coating-base under friction. The mechanisms of increasing the wear resistance of the VK8 + Cu coating according to the rheological-kinetic model, which reflects the correlation between processes of fracture and deformation under friction, are considered. It is determined that the high wear resistance of the combined coating is due to the combination of rheological properties of hard alloy VK8 with a fracture toughness of 13.2 MPa•m 1/2 and plastic copper material with a fracture toughness of 100 MPa•m 1/2 , which contributes to the efficient relaxation of stresses under friction.

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Age Hardening of Extruded AA 6005A Aluminium Alloy Powders

Cited by 7 publications

References 43 publications

Compactability Regularities Observed during Cold Uniaxial Pressing of Layered Powder Green Samples Based on Ti-Al-Nb-Mo-B and Ti-B

Compactability Regularities Observed during Cold Uniaxial Pressing of Layered Powder Green Samples Based on Ti-Al-Nb-Mo-B and Ti-B

Effect of Carbon Nanotube Content and Mechanical Milling Conditions on the Manufacture of AA7075/MWCNT Composites

Influence of Continuity of Electric Spark Coatings on Wear Resistance of Aluminum Alloy

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