In situ (Al3Zr + Al2O3np)/2024Al metal matrix composite with novel reinforcement distributions fabricated by reaction hot pressing

Kaveendran, B.; Wang, G.S.; Huang, Lujun; Li, Geng; Peng, H-X

doi:10.1016/j.jallcom.2013.06.143

Cited by 94 publications

(21 citation statements)

References 25 publications

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“…The growth phenomenon of Al 3 Zr was also previously reported in Ref. [19], and the holding time was observed to play a key role in determining the final morphology of Al 3 Zr. Consequently, the optimum sintering parameters (i.e., synthesis temperature and holding time) for the fabrication of in situ (α-Al 2 O 3 +ZrB 2 )/Al…”

Section: Figs 4(a)-(f) Show Low-and High-magnification Semsupporting

confidence: 74%

In situ (α-Al2O3+ZrB2)/Al composites with network distribution fabricated by reaction hot pressing

Mokhnache

Wang

et al. 2015

Int J Miner Metall Mater

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In situ (α-Al 2 O 3 +ZrB 2 )/Al composites with network distribution were fabricated using low-energy ball milling and reaction hot pressing. Differential thermal analysis (DTA) was used to study the reaction mechanisms in the Al-ZrO 2 -B system. X-ray diffraction (XRD) and scanning electron microscopy (SEM) in conjunction with energy-dispersive X-ray spectroscopy (EDX) were used to investigate the composite phases, morphology, and microstructure of the composites. The effect of matrix network size on the microstructure and mechanical properties was investigated. The results show that the optimum sintering parameters to complete reactions in the Al-ZrO 2 -B system are 850°C and 60 min. In situ-synthesized α-Al 2 O 3 and ZrB 2 particles are dispersed uniformly around Al particles, forming a network microstructure; the diameters of the α-Al 2 O 3 and ZrB 2 particles are approximately 1-3 μm. When the size of Al powder increases from 60-110 μm to 150-300 μm, the overall surface contact between Al powders and reactants decreases, thereby increasing the local volume fraction of reinforcements from 12% to 21%. This increase of the local volume leads to a significant increase in microhardness of the in situ (α-Al 2 O 3 -ZrB 2 )/Al composites from Hv 163 to Hv 251.

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Section: Figs 4(a)-(f) Show Low-and High-magnification Semsupporting

confidence: 74%

In situ (α-Al2O3+ZrB2)/Al composites with network distribution fabricated by reaction hot pressing

Mokhnache

Wang

et al. 2015

Int J Miner Metall Mater

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“…To deal with such an issue, a series of MMNCs with the tailored reinforcement distribution have been proposed. For example, Kaveendran et al [4] constituted a 3D network microstructure in (Al 3 Zr+Al 2 O 3np )/2024Al nanocomposites by low energy ball milling and reaction hot pressing. Gupta et al [5] fabricated (Al+Al 2 O 3np )/Mg nanocomposites with a novel hierarchical microstructure via powder metallurgy.…”

Section: Introductionmentioning

confidence: 99%

“…More recently, ZrB 2 /Al nanocomposites have been investigated based on direct melt reaction (DMR) between halide salts (KBF 4 and K 2 ZrF 6 ) and Al, where agglomeration of ZrB 2 nanoparticle is a common phenomenon in this reactive system [6][7][8]. Echoing the novel design philosophy, we should reappraise the micro-architectures of these nanoparticle clusters and their roles in mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Zrb2 nanoparticle cluster reinforced Al matrix composites fabricated by direct melt reaction

Zhang¹,

Yang²,

Liu³

et al. 2017

AIP Conference Proceedings

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Abstract. In this work, ZrB 2 nanoparticle cluster reinforced 6061Al composites were synthesized by direct melt reaction between halide salts (KBF 4 and K 2 ZrF 6 ) and Al. The experimental results revealed that the formation of Type III cluster (>60 μm, grain interior) depended on ZrB 2 addition levels (>2 vol. %), whilst Type I (~5 μm, grain interior) and II (5~60 μm, grain/ interdendritic boundaries) were always present. The optimum tensile strength and elongation obtained in 2vol. % ZrB2/6061Al composite were substantially improved to approximately 1.52 and 2.75 times those of the 6061Al alloy. The enhanced strength was attributed to a combination effect of grain refinement (Type II cluster) and Orowan/CTE strengthening (Type I cluster). On the other hand, the impressive ductility increase was also ascribed to the presence of toughened clusters (Type I and II) that introduced the plastic slip bands and equiaxed dimples.

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“…There, RHP which involves hot compaction of the in situ reinforcements and matrix followed by hot compaction can obtain near fully dense composites. [13][14][15][16] In this work, an attempt has been made to control the reaction between Al and C thereby trying to eliminate Al 4 C 3 from the fabricated composite. RHP is used to fabricate three in situ composites with different SiO 2 /C/Al molar ratios.…”

Section: Introductionmentioning

confidence: 99%

In Situ Al Based Composites Fabricated in Al-SiO2-C System by Reaction Sintering

Mokhnache

Wang

et al. 2015

JOM

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In situ Al-based composites with different SiO 2 /C/Al molar ratios were fabricated by reaction hot pressing. Differential scanning calorimetry (DSC) was used to investigate the reaction mechanisms in the Al-SiO 2 -C system. X-ray diffraction results revealed that no new resultant phase was observed below the melting temperature of aluminum except the SiO 2 , C and Al phases. Heating at different synthesis temperatures showed that, up to 1000°C with a holding time of 1 h, the reactions in the Al-SiO 2 -C system took place completely, where the final products were Al 2 O 3 , SiC, Al 4 C 3 and Si. Microstructural observation showed that the in situ synthesized Al 2 O 3 , SiC, Al 4 C 3 , and Si were dispersed uniformly and had fine sizes less than 2 lm. The formed interfaces between the reinforcements and Al matrix are clean and free from any interfacial phase. During cooling, the synthesized Si formed a multilayer growth in the (111) direction. When the SiO 2 /C/Al molar ratio was (6/3/9), more Al 2 O 3 and Si were produced along with the complete prevention of Al 4 C 3 in the Al-SiO 2 -C system. The yield strength, ultimate tensile strength and Brinell hardness of the in situ fabricated composites are significantly higher than those of pure aluminum matrix, with a decrease of ductility. Mechanisms governing the tensile fracture process are also discussed.

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In situ (Al3Zr + Al2O3np)/2024Al metal matrix composite with novel reinforcement distributions fabricated by reaction hot pressing

Cited by 94 publications

References 25 publications

In situ (α-Al2O3+ZrB2)/Al composites with network distribution fabricated by reaction hot pressing

In situ (α-Al2O3+ZrB2)/Al composites with network distribution fabricated by reaction hot pressing

Zrb2 nanoparticle cluster reinforced Al matrix composites fabricated by direct melt reaction

In Situ Al Based Composites Fabricated in Al-SiO2-C System by Reaction Sintering

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