Preparation and characterization of aluminum borate whisker reinforced magnesium alloy composites by semi-solid process

Yoshida, Makoto; Takeuchi, Shuhei; Jin, Peng; Sasaki, Gen; Fuyama, Nobuyuki; Fuj, Toru; Fukunaga, Hideharu

doi:10.1163/156855199x00254

Cited by 16 publications

(9 citation statements)

References 4 publications

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“…The whisker thickness was relatively homogeneous for each material. This morphology was previously reported [2,6,7,[9][10][11] for aluminum borates and is consistent with the borate formation observed after the XRD analysis. However, the two borates observed were not differentiated by the microstructural analysis; the unreacted alumina particles were also difficult to observe.…”

Section: Crystalline Phases Of the Materials Developed From The Al 2 supporting

confidence: 91%

“…The low degree of sintering is consistent with that reported in the literature; high porosity materials are obtained due to the formation of aluminum borate needles [2,6,7,[9][10][11].…”

Section: Sintering Shrinkage and Textural Properties As A Function Osupporting

confidence: 90%

“…The utilization of aluminum borate needles or whiskers for aluminum and aluminum based alloy reinforcement is the main application of these phases [6]. They have also been proposed for the reinforcement of magnesium alloys [7]. The mechanical behavior of the material, the chemical compatibility (low wettability) of borate with metallic aluminum, and the microstructural configuration of the metalceramic composites encourage these particular applications.…”

Section: Introductionmentioning

confidence: 99%

“…Vitroceramics with aluminum borates as crystalline phase were also studied, showing technological properties [8]. Furthermore, aluminum borates have also been used as refractory, insulating or filtering materials [4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

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Formation, microstructure and properties of aluminum borate ceramics obtained from alumina and boric acid

Hernández

Suárez

Cipollone

et al. 2017

Ceramics International

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The formation of aluminum borates (Al 18 B 4 O 33 and Al 4 B 2 O 9) from alumina and boron oxide occurs between 600 and 800°C. These materials have refractory properties and corrosion resistance. The objective of this work is to develop materials from the Al 2 O 3-B 2 O 3 system, employing alumina and boric acid as starting powders, to study the critical processing variables and describe the developed microstructure and properties. Three formulations (13, 19.5 and 26 wt% B 2 O 3) were studied. In order to confirm the formation of borates, the differential thermal analysis and thermogravimetric analysis were carried out. Afterwards, uniaxially pressed disc-shaped specimens were fired at four temperatures above the formation temperature. The textural properties of the ceramics were evaluated by the immersion method, this permit to evaluate the sintering processes. Then the degree of borate formation was confirmed by X-ray diffraction. Finally, the developed microstructures were characterized by scanning electron microscopy, and the diametral compression behavior was evaluated. A series of porous (≈50%) refractory materials from the Al 2 O 3-B 2 O 3 system were developed. The processing strategy resulted in materials with Al 18 B 4 O 33 as the main crystalline phase. Needle grains with diameters between 0.2 and 1 µm and an aspect ratio over 20:1 were obtained. Thus, based on the information gathered from our research, aluminum borate ceramic materials can be designed for structural, insulating or filtering applications employing only alumina and boric acid as boron oxide source.

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Section: Crystalline Phases Of the Materials Developed From The Al 2 supporting

confidence: 91%

“…The low degree of sintering is consistent with that reported in the literature; high porosity materials are obtained due to the formation of aluminum borate needles [2,6,7,[9][10][11].…”

Section: Sintering Shrinkage and Textural Properties As A Function Osupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Formation, microstructure and properties of aluminum borate ceramics obtained from alumina and boric acid

Hernández

Suárez

Cipollone

et al. 2017

Ceramics International

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“…The need for cast structural components of high performance Aluminum alloy composites is expected to increase as automotive industries are forced to improve the fuel efficiency of their products. Fabrication methods, such as mechanical stir casting [8][9][10][11][12][13][14][15], powder metallurgy [16,17], and squeeze casting [18][19][20][21] have been applied to produce discontinuously micro particles reinforced Aluminum MMCs. Among these methods, stir casting is an easily adaptable and cost-effective method.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and mechanical properties of Al-nano ZrO 2 composites produced by casting route

et al. 2007

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Aluminum metal matrix composites (AMCs) are regarded as candidate materials for aerospace and automotive applications owning to their superior properties, such as high specific modulus specifically at high temperatures, good strength and low wear rates. AMCs have been prepared by liquid metal route such as pressureless infiltration, squeeze casting, stir casting, spray forming, etc. Each of these processes has their own advantages and limitations. The choice of the fabrication techniques is dictated by production cost, process efficiency, the quality desired in the product and their applications. AMCs cast from the liquid state are of interest because of their relatively low processing cost and ease in manufacturing. In the present project, Aluminum A356 and zirconia nano particles were selected as raw materials. Zirconia nano particles were founded to be a promising candidate due to its high hardness, high modulus of elasticity and excellent thermal stability. Samples of composites was made at different amount of zirconia's particles (0, 1.5, 2.5, 5vol %) and temperature of casting were 800, 850 and 950°C. Microstructure of composite specimens was examined using SEM and optical microscopy. Chemical composition was investigated by XRD method. Physical properties such as density and porosity were determined by Archimedes and image analyzing methods. Mechanical properties such as tensile strength, hardness and toughness were determined. The experimental results show that the mechanical properties like tensile strength and hardness markedly improved by adding zirconia nano particles. The maximum was for samples with 5vol% of nano particles were casted at 850°C. Fracture toughness decreased by addition of zirconia nano particles.

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Characterization and Mechanical Properties of 2024/Y2O3 Composite Developed by Stir Rheocasting

Lemessa

Karunakar

2020

Lecture Notes in Mechanical Engineering

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Preparation and characterization of aluminum borate whisker reinforced magnesium alloy composites by semi-solid process

Cited by 16 publications

References 4 publications

Formation, microstructure and properties of aluminum borate ceramics obtained from alumina and boric acid

Formation, microstructure and properties of aluminum borate ceramics obtained from alumina and boric acid

Microstructure and mechanical properties of Al-nano ZrO 2 composites produced by casting route

Characterization and Mechanical Properties of 2024/Y2O3 Composite Developed by Stir Rheocasting

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