High-temperature strength of compacted sub-micrometer aluminium powder

Poletti, María Cecilia; Balog, Martin; Šimančík, František; Degischer, H. P.

doi:10.1016/j.actamat.2010.03.021

Cited by 56 publications

(23 citation statements)

References 25 publications

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“…On the other hand, clean metal-metal grain boundaries of DE and HIP compacts yielded higher room temperature ductility. Significant decrease of the tensile ductility with increase of the testing temperature was consistent with other studies [16][17][18]. In these studies reduced fracture resistance at elevated temperatures was attributed speculatively to strain localization and plastic instability between growing microvoids.…”

Section: Resultssupporting

confidence: 87%

“…Since the oxide dispersoids within DE and HIP compacts were predominantly found at the grain boundaries they cannot effectively contribute on strengthening by means of Orowan mechanism. At elevated temperatures stability of the grain interfaces becomes important [16]. Herein, Al + continuous Al 2 O 3 skeleton composite structure of F material yielded smaller strength drop as the testing temperature increased.…”

Section: Resultsmentioning

confidence: 92%

See 1 more Smart Citation

The effect of native Al2O3 skin disruption on properties of fine Al powder compacts

Balog

Poletti

Šimančík

et al. 2011

Journal of Alloys and Compounds

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Section: Resultssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 92%

The effect of native Al2O3 skin disruption on properties of fine Al powder compacts

Balog

Poletti

Šimančík

et al. 2011

Journal of Alloys and Compounds

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“…However, the properties of A319 drop sharply with elevating temperatures for the coarsening and harmful phase transition of metastable intermetallic compounds. In order to solve the problem, some Al matrix composites have been fabricated by using dispersed ceramic particles like Si 3 N 4 10 or Al 2 O 3 11 12 . For particles reinforced composites, the properties can be affected by many important factors including particulate types 13 , sizes 14 15 16 , volume fractions 17 18 and the interfaces between matrix and secondary phases 19 .…”

mentioning

confidence: 99%

A novel Al matrix composite reinforced by nano-AlNp network

Zhao

Tian

et al. 2016

Sci Rep

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In pursuit of lightweighting of automobiles and low emission of transportation, the efforts to develop high-strength, heat-resistant and fatigue-resistant Al alloys and/or composites have been ongoing. Here we report a novel Al matrix composite with ultrahigh strength reinforced by a three dimensional network of nano-AlN particles for the first time. The in-situ synthesized AlN particles are connected by twinning bonding chains and built up a three dimensional network strengthening Al matrix enormously like the skeleton to human body. The composite containing 16.4wt.% AlN particles shows excellent properties: the ultimate tensile strengths can be up to 518MPa at room temperature and 190MPa at 350 °C. This peculiar performance results from the novel spatial distribution of nano-scale AlN particles. Our findings in this work would help to develop a potential candidate for high-performance heat resistance light-metal based materials.

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“…Nevertheless, Al materials with long-term stable strength at over 300 °C are further desired in some special applications such as pistons, fuselage bulkheads, wing skins, heat-resistant conductors and neutron absorber materials [4][5][6][7]. However, age-hardened Al alloys exhibiting prominent properties at room temperature (RT) usually lose their strength at high temperature, because precipitates such as Mg 2 Si, CuAl 2 , MgZn 2 would coarsen/dissolve and lose strengthening efficacy rapidly at ~ 200 °C because of diffusion of alloying elements [4,5,8,9].…”

Section: Introductionmentioning

confidence: 99%

Enhancing High-Temperature Strength and Thermal Stability of Al2O3/Al Composites by High-Temperature Pre-treatment of Ultrafine Al Powders

Zan

Zhou

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

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Amorphous Al 2 O 3 -reinforced Al composite (am-Al 2 O 3 /Al) compacted from ultrafine Al powders for high-temperature usages confronts with drawbacks because crystallization of am-Al 2 O 3 at high temperatures will result in serious strength loss. Aiming at this unsolved problem, in this study, high-temperature Al materials with enhanced thermal stability were developed through introducing more thermally stable nano-sized particles via high-temperature pre-treatment of ultrafine Al powders. It was found that the pre-treatment at ≤ 550 °C could introduce a few Al 2 O 3 in the Al matrix and increase the strength of the composites, but the strength was still below that of am-Al 2 O 3 /Al because without being pinned firmly, grain boundaries (GBs) were softened at high temperature and intergranular fracture happened. When the pre-treatment was carried out at 600 °C, nitridation and oxidation processes happened simultaneously, producing large numbers of intergranular (AlN + γ-Al 2 O 3 ) particles. GB sliding and intergranular fracture were suppressed; therefore, higher strength than that of am-Al 2 O 3 /Al was realized. Furthermore, the (AlN + γ-Al 2 O 3 )/Al exhibited more superior thermal stability compared to am-Al 2 O 3 /Al for annealing treatment at 580 °C for 8 h. Therefore, an effective way to fabricate high-temperature Al composite with enhanced thermal stability was developed in this study.

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High-temperature strength of compacted sub-micrometer aluminium powder

Cited by 56 publications

References 25 publications

The effect of native Al2O3 skin disruption on properties of fine Al powder compacts

The effect of native Al2O3 skin disruption on properties of fine Al powder compacts

A novel Al matrix composite reinforced by nano-AlNp network

Enhancing High-Temperature Strength and Thermal Stability of Al2O3/Al Composites by High-Temperature Pre-treatment of Ultrafine Al Powders

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