Effect of the Ti-6Al-4V powder size on the microstructure and mechanical properties of composites with nickel-coated graphene nanoflakes

ABSTRACTThe present study aimed to investigate the microstructure and mechanical properties of aluminum matrix composites reinforced with high volume fraction of Si3N4 fabricated by the pressure casting technique, with variations in the composition of matrix alloy and microstructure of preforms. Characterization was carried out by a combination of metallography, flexural and load-controlled fatigue tests to study the flexural strength, fracture toughness and fatigue behavior in the composites. The findings indicated that increasing matrix strength resulted in an increase in flexural strength and fatigue resistance of composites. The fracture toughness of composites increased with the volume fraction of infiltrated tough Al phase. The CIP pressure exerted a significant effect on mechanical properties of composites. The improvement in mechanical properties of composites is associated with the load transfer effect from matrix to the stiffer reinforcement.

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Microstructure and mechanical properties of composites of bovine derived hydroxyapatite (BHA) reinforced with MgF2

International Journal of Advances in Engineering and Pure Sciences ◽

10.7240/jeps.771433 ◽

2020 ◽

Author(s):

Mustafa SENGOR

Keyword(s):

Mechanical Properties ◽

Microstructure And Mechanical Properties ◽

Properties Of Composites

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Microstructure and Mechanical Properties of Composites Obtained by Spark Plasma Sintering of Al–Fe66Cr10Nb5B19 Metallic Glass Powder Mixtures

Metals ◽

10.3390/met11091457 ◽

2021 ◽

Vol 11 (9) ◽

pp. 1457

Author(s):

Dina V. Dudina ◽

Boris B. Bokhonov ◽

Igor S. Batraev ◽

Vyacheslav I. Kvashnin ◽

Mikhail A. Legan ◽

...

Keyword(s):

Mechanical Properties ◽

Metallic Glass ◽

Spark Plasma Sintering ◽

Structure Evolution ◽

Powder Mixtures ◽

Microstructure And Mechanical Properties ◽

Plasma Sintering ◽

The Matrix ◽

Spark Plasma ◽

Properties Of Composites

At present, metallic glasses are evaluated as alternative reinforcements for aluminum matrix composites. These composites are produced by powder metallurgy via consolidation of metallic glass-aluminum powder mixtures. In most studies, the goal has been to preserve the glassy state of the reinforcement during consolidation. However, it is also of interest to track the structure evolution of these composites when partial interaction between the matrix and the metallic glass is allowed during sintering of the mixtures. The present work was aimed to study the microstructure and mechanical properties of composites obtained by spark plasma sintering (SPS) of Al-20 vol.% Fe66Cr10Nb5B19 metallic glass mixtures and compare the materials, in which no significant interaction between the matrix and the Fe-based alloy occurred, with those featuring reaction product layers of different thicknesses. Composite materials were consolidated by SPS at 540 and 570 °C. The microstructure and mechanical properties of composites obtained by SPS and SPS followed by forging, composites with layers of interfacial reaction products of different thicknesses, and metallic glass-free sintered aluminum were comparatively analyzed to conclude on the influence of the microstructural features of the composites on their strength.

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Effect of graphene orientation on microstructure and mechanical properties of silicon nitride ceramics

Processing and Application of Ceramics ◽

10.2298/pac1801027z ◽

2018 ◽

Vol 12 (1) ◽

pp. 27-35 ◽

Cited By ~ 4

Author(s):

Yubing Zhang ◽

Guangchun Xiao ◽

Mingdong Yi ◽

Chonghai Xu

Keyword(s):

Mechanical Properties ◽

Hot Pressing ◽

Crack Deflection ◽

Polished Surface ◽

Thermal Expansion Mismatch ◽

Microstructure And Mechanical Properties ◽

Nitride Ceramics ◽

Intrinsic Anisotropy ◽

Graphene Platelets ◽

Properties Of Composites

Mechanical properties and microstructure of graphene platelets reinforced Si3N4 composites have been investigated and compared to monolithic Si3N4. The microstructure shows that graphene platelets are parallel to each other and perpendicular to the hot pressing direction. Fracture toughness and flexural strength of composite with 1 wt.% graphene measured on polished surface perpendicular to hot pressing direction are 8.7MPa?m1/2 and 892MPa, respectively, which are increased about 14.5% and 20.2% compared with that parallel to hot pressing direction. The anisotropy of microstructure and mechanical properties of composites can be explained by the intrinsic anisotropy of graphene as well as the crack deflection energy release rate and the weak boundary bonding between graphene and Si3N4 caused by the thermal expansion mismatch.

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Effect of Powder Size on Microstructure and Mechanical Properties of 2A12Al Compacts Fabricated by Hot Isostatic Pressing

Advances in Materials Science and Engineering ◽

10.1155/2018/1989754 ◽

2018 ◽

Vol 2018 ◽

pp. 1-7 ◽

Cited By ~ 1

Author(s):

Xina Huang ◽

Lihui Lang ◽

Gang Wang ◽

Sergei Alexandrov

Keyword(s):

Mechanical Properties ◽

Alloy Powder ◽

Powder Compact ◽

Hot Isostatic Pressing ◽

Powder Size ◽

Microstructure And Mechanical Properties ◽

Powder Particles ◽

Aluminum Alloy Powder ◽

Precipitated Phases ◽

Dense Powder

This paper studied the effects of powder size on densification, microstructure, and mechanical properties of the hot isostatic-pressed 2A12 aluminum alloy powder compact. The results show that the near-fully dense powder compact can be successfully achieved and the smaller the powder is, the higher the relative density is. In addition, as the powder size decreases, the precipitated phases in the powder compact change from continuously point-like distribution at the junctions among powder particles to the concentrated distribution at the three-way intersections. Compared with the large powder, the tensile strength, yield strength, and elongation of the compact with the small powder were improved by 14%, 30.8%, and 48.6%, respectively.

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