scholarly journals Effect of Alumina Content on the Mechanical Properties of Alumina Particle Dispersion Magnesium

2011 ◽  
Vol 75 (8) ◽  
pp. 424-431 ◽  
Author(s):  
Shigehiro Kawamori ◽  
Kiyoshi Kuroda ◽  
Yukio Kasuga ◽  
Masahiro Yokouchi ◽  
Hiroshi Fujiwara ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Alumina Particle ◽  
Particle Dispersion ◽  
Alumina Content

scholarly journals Effect of Alumina Content on the Mechanical Properties of Alumina Particle Dispersion Magnesium

2010 ◽  
Vol 51 (10) ◽  
pp. 1893-1900 ◽  
Author(s):  
Shigehiro Kawamori ◽  
Kiyoshi Kuroda ◽  
Yukio Kasuga ◽  
Masahiro Yokouchi ◽  
Hiroshi Fujiwara ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Alumina Particle ◽  
Particle Dispersion ◽  
Alumina Content

Mechanical Properties of Hot-Pressed Compacts Made by Alumina Particle Dispersion Magnesium Powders

2012 ◽  
Vol 706-709 ◽  
pp. 1915-1920 ◽  
Author(s):  
Shigehiro Kawamori ◽  
Kiyoshi Kuroda ◽  
Hiroshi Fujiwara ◽  
Kei Ameyama
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Bending Strength ◽  
Alumina Particle ◽  
Interparticle Distance ◽  
Particle Dispersion ◽  
Particle Sizes ◽  
Maximum Hardness ◽  
Powder Mixtures ◽  
Particle Strengthening

To enhance the mechanical properties of Mg alloys, powders of pure Mg (Al2O3/Mg) dispersed with over 10 vol% Al2O3 particles were formed by ball milling powder mixtures of pure Mg and Al2O3 particles with particle sizes of 0.3 and 1 μm. The effect of the Al2O3 content of hot-pressed discs of Al2O3/Mg powders on the mechanical properties was investigated. The hardness increased sharply at certain Al2O3 content. This is considered to be because of the development of Al2O3 particle strengthening due to the excellent interfacial bonding between Mg and Al2O3 particles when the Al2O3/Mg discs contain a sufficient amount of Al2O3 particles and have a sufficient interparticle distance. The maximum hardness was 220 HV. The tensile strength increased as Al2O3 content was increased. The Al2O3/Mg plate with Al2O3 particles sizes of 0.3 and 1 μm indicated maximum values of the bending strength at 10 and 14vol%Al2O3 content, respectively.

Thermal and Mechanical Properties of Highly-Filled Polybenzoxazine-Alumina Composites

2013 ◽  
Vol 545 ◽  
pp. 211-215 ◽  
Author(s):  
Jirawat Kajornchaiyakul ◽  
Chanchira Jubsilp ◽  
Sarawut Rimdusit
Keyword(s):  
Room Temperature ◽  
Alumina Particle ◽  
Mechanical Analysis ◽  
Interfacial Interaction ◽  
Alumina Content ◽  
Mechanical And Thermal Properties ◽  
Thermal And Mechanical Properties ◽  
Scanning Calorimetry ◽  
Glass Transition Temperatures ◽  
Alumina Composites

-Highly filled alumina polymer composites based on bisphenol-A/aniline benzoxazine resin (BA-a) were developed. The mechanical and thermal properties of these highly filled composites at various alumina filler contents from 0 to 85 % by weight were studied by dynamic mechanical analysis (DMA) and differential scanning calorimetry (DSC). The experimental results revealed that the storage modulus (E') at room temperature was increased from 5.93 GPa of the neat polybenzoxazine up to about 45.27 GPa of the composites with the maximum alumina content of 83 % by weight. The glass-transition temperatures (Tg) of the composites systematically increased with increasing the alumina filler contents. The Tgs of the obtained composites having alumina content ranging from 50 to 83 % by weight were found to be 178°C to 188°C, which higher that the Tg of the polybenzoxazine, i.e. 176°C implying substantial interfacial interaction between the alumina particle and the polybenzoxazine.

Effect of Al2O3 nanoparticles on microstructure and mechanical properties of friction stir-welded dissimilar aluminum alloys AA7075-T6 and AA6061-T6

2021 ◽  
pp. 095440892110655
Author(s):  
Sumit Jain ◽  
R.S. Mishra
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Rotational Speed ◽  
Traverse Speed ◽  
Particle Dispersion ◽  
Al2o3 Nanoparticles ◽  
Tool Rotational Speed ◽  
Micro Hardness ◽  
Friction Stir ◽  
Dissimilar Aluminum Alloys

In this research, a defect-free dissimilar weld joint of AA7075-T6 and AA6061-T6 reinforced with Al2O3 nanoparticles was fabricated via friction stir welding (FSW). The influence of tool rotational speed (700, 900 and 1100 rpm), traverse speed (40, 50 and 60 mm/min) with varying volume fractions of Al2O3 nanoparticles (4%, 7% and 10%) on microstructural evolution and mechanical properties were investigated. The augmentation of various mechanical properties is based on the homogeneity of particle dispersion and grains refinement in the SZ of the FSWed joint. The findings revealed that the remarkable reduction in grain size in the SZ was observed owing to the incorporation of Al2O3 nanoparticles produces the pinning effect, which prevents the growth of grain boundaries by dynamic recrystallization (DRX). The increasing volume fraction of Al2O3 nanoparticles enhanced the mechanical properties such as tensile strength, % elongation and micro-hardness. Agglomeration of particles was observed in the SZ of the FSWed joints produced at lower tool rotational speed of 700 rpm and higher traverse speed of 60 mm/min due to unusual material flow. Homogenous particle dispersion and enhanced material mixing ensue at higher rotational speed of 1100 rpm and lower traverse speed of 40 mm/min exhibit higher tensile strength and micro-hardness.

Effect of Alumina (Al2O3) to the Properties of Whiteware Porcelain

2020 ◽  
Vol 1010 ◽  
pp. 194-199
Author(s):  
Hamdan Yahya ◽  
Aspaniza Ahmad ◽  
Ismail Ibrahim
Keyword(s):  
Mechanical Properties ◽  
Flexural Strength ◽  
Water Absorption ◽  
Bulk Density ◽  
Physical And Mechanical Properties ◽  
Porcelain Body ◽  
The Other ◽  
Alumina Content ◽  
Crystalline Phases ◽  
Mullite Phase

The effect of Al2O3 to the properties of whiteware porcelain such as water absorption, bulk density, flexural strength and crystalline phases were studied systematically. The result shows that the addition of alumina at maximum 5 wt.% in porcelain bodies increased the flexural strength of the fired bodies which can reach 55.5 MPa, 30% higher than 0.0% alumina content. However, slight decrease in the other physical and mechanical properties was observed with Al2O3 addition higher than 5 wt.%, which is believed to be due to increased corundum phase compared to mullite phase in porcelain body.

Microstructures and properties of direct laser sintered tungsten carbide (WC) particle reinforced Cu matrix composites with RE–Si–Fe addition: A comparative study

2009 ◽  
Vol 24 (11) ◽  
pp. 3397-3406 ◽  
Author(s):  
Dongdong Gu ◽  
Yifu Shen
Keyword(s):  
Mechanical Properties ◽  
Comparative Study ◽  
Tungsten Carbide ◽  
High Performance ◽  
Chemical Properties ◽  
Particle Dispersion ◽  
Matrix Composites ◽  
Direct Laser ◽  
Interfacial Compatibility ◽  
Fe Addition

The poor wettability between ceramics and metals is a main obstacle in obtaining high-performance metal-matrix composites (MMCs) parts using direct metal laser sintering (DMLS). Rare earth (RE) elements, due to their unique physical and chemical properties, have high potential for improving laser processability of MMCs. In this work, a comparative study was performed to investigate the influence of RE–Si–Fe addition on microstructural features and mechanical properties of DMLS processed tungsten carbide (WC) particle reinforced Cu MMCs parts. It showed that by adding 3 wt% RE–Si–Fe, the WC reinforcing particles were refined, the particle dispersion state was homogenized, and the particle/matrix interfacial compatibility was enhanced. The RE–Si–Fe-containing WC/Cu MMCs parts possessed significantly elevated mechanical properties, i.e., densification level of 95.7%, microhardness of 417.6 HV, fracture strength of 201.8 MPa, and friction coefficient of 0.8. The metallurgical functions of the RE–Si–Fe additive for the improvement of DMLS quality of MMCs parts were discussed.

Effects of Sintering Conditions on the Mechanical Properties of Alumina Particle Dispersed Magnesium SPS Compacts

2014 ◽  
Vol 783-786 ◽  
pp. 2433-2438 ◽  
Author(s):  
Shigehiro Kawamori ◽  
Hiroshi Fujiwara ◽  
Yukio Kasuga
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Alumina Particle ◽  
Applied Pressure ◽  
Powder Mixtures ◽  
Cooling Conditions ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Xrd And Tem ◽  
Main Factor

To enhance the mechanical properties of Mg alloys, 0-30vol% Al2O3/Mg powders were formed by ball milling powder mixtures of pure Mg and Al2O3 particles, and then Spark plasma sintering (SPS) compacts (Al2O3/Mg discs) were made by the Al2O3/Mg powders. The effect of the cooling conditions in the SPS process on the mechanical properties of the Al2O3/Mg discs was investigated. From the results of SEM, XRD and TEM-EDS, the microstructures of the Al2O3/Mg discs were identified to consist of α-Mg solid solution, Al2O3 particles, refined MgO particles and refined needle-like Mg17Al12 ( more than 20vol% Al2O3 content). The mechanical properties of the discs were able to control by the regulation of the cooling conditions (cooling rate (vc) and applied pressure in the cooling (pc)) in SPS process, and as a result, the SPS discs possessing the mechanical properties beyond HP compacts were obtained under the cooling conditions of “vc= 0.83K/sand pc = 20MPa”. Main factor that the cooling conditions in SPS process effect on the mechanical properties of the Al2O3/Mg discs are considered to be the compresive residual stress generated in the α - Mg solid solution by the thermal stress associated with deference of the coefficients of thermal expansion between the α - Mg and ceramics particles (Al2O3 and MgO) in the discs.

Bionanohydroxyapatite/Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) Composites with Improved Particle Dispersion and Superior Mechanical Properties

2008 ◽  
Vol 20 (8) ◽  
pp. 2802-2808 ◽  
Author(s):  
Bina Rai ◽  
Wadcharawadee Noohom ◽  
Prakash H. Kithva ◽  
Lisbeth Grøndahl ◽  
Matt Trau
Keyword(s):  
Mechanical Properties ◽  
Particle Dispersion ◽  
Superior Mechanical Properties
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