The strengthening and toughening mechanism of Fe−Al/Al2O3 composite material

2006 ◽  
Vol 21 (2) ◽  
pp. 10-13
Author(s):  
Sun Kangning ◽  
Bi Jianqiang ◽  
Liu Rui
Keyword(s):  
Composite Material ◽  
Toughening Mechanism ◽  
Al2o3 Composite

Microstructure and toughening mechanism of the 3Y-TZP/Al2O3 composite reinforced by SiC whiskers

1996 ◽  
Vol 31 (24) ◽  
pp. 6637-6643 ◽  
Author(s):  
Fang-Fang Xu ◽  
Li-Tai Ma ◽  
Shu-Lin Wen
Keyword(s):  
Toughening Mechanism ◽  
Al2o3 Composite ◽  
Sic Whiskers

TiN/Al2O3 Composite Material Synthesized by Aluminothermic Reduction Process in Reductive Atmosphere

2008 ◽  
Vol 368-372 ◽  
pp. 721-723
Author(s):  
Jian Hua Nie ◽  
Ya Wei Li ◽  
Hao Yan ◽  
Yong He Liang ◽  
Yuan Bing Li
Keyword(s):  
Composite Material ◽  
Reduction Process ◽  
Lattice Parameter ◽  
Reduction Reaction ◽  
Treatment Temperature ◽  
Aluminothermic Reduction ◽  
Aluminothermic Reaction ◽  
Al2o3 Composite ◽  
Different Temperatures ◽  
Reductive Atmosphere

TiN/Al2O3 composite material was prepared by aluminothermic reduction of TiO2 in coke bed from mixtures of TiO2 powder and metal Al powder. The phase composition, lattice parameter and microstructure of products after treatment in different temperatures were analyzed by XRD, SEM. The results show that TiN/Al2O3 composite material can be produced in coke bed via aluminothermic reduction reaction. Moreover, the treatment temperature affects the evolution of aluminothermic reaction and morphology of products obviously. The content, grain size and lattice parameter of TiN in products in coke bed increase with the increasing of treatment temperature. Thermodynamically it confirms that metal Al reacts with oxygen in coke bed while it is involved in aluminothermic reduction reaction, and then it causes the lack of Al, which takes part in the aluminothermic reaction leading to a surplus rutile in the products.

Nanostructural Characterization of Hydrothermally Stable γ-Alumina-Based Composite Materials by Transmission Electron Microscopy

2007 ◽  
Vol 26-28 ◽  
pp. 1109-1112
Author(s):  
Shinji Fujisaki ◽  
Md. Hasan Zahir ◽  
Yumi H. Ikuhara ◽  
Yuji Iwamoto ◽  
Kotaro Kuroda
Keyword(s):  
Electron Microscopy ◽  
Solid Solution ◽  
Transmission Electron Microscopy ◽  
Composite Material ◽  
Sol Gel ◽  
Structural Features ◽  
Hydrothermal Stability ◽  
Transmission Electron ◽  
Al2o3 Composite ◽  
Powder Samples

La2O3 and/or Ga2O3 doped, and the double dopant γ-Al2O3 composite powder samples were prepared by the sol-gel method. Nanostructural characterizations of the powder samples were performed by high resolution transmission electron microscopy (HRTEM) in order to clarify the role of the metal oxide dopants for the improved hydrothermal stability of the La2O3-doped Ga2O3-Al2O3 composite material. The results of HRTEM study and selected area electron diffraction (SAED) analysis revealed the formation of the uniform solid solution of Ga2O3-Al2O3. In addition, the results of X-ray elemental mapping analysis revealed the existence of well-dispersed La2O3 on the grain surface of Ga2O3-Al2O3 solid solution. These structural features could act an important role for the improved hydrothermal stability of the La2O3-doped Ga2O3-Al2O3 composite material.

Workability studies on cold upsetting of Al–Al2O3 composite material

2006 ◽  
Vol 27 (7) ◽  
pp. 566-575 ◽  
Author(s):  
R. Narayanasamy ◽  
T. Ramesh ◽  
K.S. Pandey
Keyword(s):  
Composite Material ◽  
Cold Upsetting ◽  
Al2o3 Composite

The Elaboration of Composite Materials from the Cu-Al2O3 System Using CuO and Al2O3 Powders

2007 ◽  
Vol 23 ◽  
pp. 83-86
Author(s):  
Dana Salomie ◽  
Codruta Pavel ◽  
Radu Mureşan
Keyword(s):  
Composite Material ◽  
Composite Materials ◽  
Copper Oxide ◽  
Al2o3 Content ◽  
Alumina Powder ◽  
Simple Method ◽  
Good Dispersion ◽  
Al2o3 Composite ◽  
Segregation Effect ◽  
Compacting Pressure

The main objective of this study is to find out a simple method to ensure a good dispersion of Al2O3 in the Cu matrix. The method should avoid the segregation effect due to the high difference of the densities of Cu (8.93 g/cm3) and Al2O3 (3.96 g/cm3). In the process of obtaining of the Cu-Al2O3 composite we have considered starting with a material whose density is closer to the density of Al2O3. We have chosen CuO whose density is about 6 g/cm3 so the composite material was obtained starting with copper oxide and alumina powder. We have studied the influence of Al2O3 content and of the compacting pressure upon material’s compactness and hardness. The dispersion finer is highlighted by the microstructure of the surfaces.

Evaluation of Whisker Alignment in Axisymmetric SiCw-Reinforced Al2O3 Composite Material

1994 ◽  
Vol 77 (11) ◽  
pp. 2828-2832 ◽  
Author(s):  
Hyoung-Joon Park ◽  
Hyoun-Ee Kim ◽  
Doh-Yeon Kim
Keyword(s):  
Composite Material ◽  
Al2o3 Composite

Atomic structure of interface of intermetallic compound TiAl and nitride Ti2AIN using HREM and image processing

1991 ◽  
Vol 49 ◽  
pp. 570-571
Author(s):  
E. Sukedai ◽  
H. Mabuchi ◽  
H. Hashimoto ◽  
Y. Nakayama
Keyword(s):  
Mechanical Properties ◽  
Image Processing ◽  
Composite Material ◽  
Intermetallic Compound ◽  
Side Surface ◽  
High Resolution Electron Microscopy ◽  
Hexagonal Structure ◽  
Second Phase ◽  
Resolution Electron ◽  
Compound Tial

In order to improve the mechanical properties of an intermetal1ic compound TiAl, a composite material of TiAl involving a second phase Ti2AIN was prepared by a new combustion reaction method. It is found that Ti2AIN (hexagonal structure) is a rod shape as shown in Fig.1 and its side surface is almost parallel to the basal plane, and this composite material has distinguished strength at elevated temperature and considerable toughness at room temperature comparing with TiAl single phase material. Since the property of the interface of composite materials has strong influences to their mechanical properties, the structure of the interface of intermetallic compound and nitride on the areas corresponding to 2, 3 and 4 as shown in Fig.1 was investigated using high resolution electron microscopy and image processing.

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