The most important tendencies in the development of powder metallurgy. II. Progress in the area of development of new materials (review)

1989 ◽  
Vol 28 (8) ◽  
pp. 605-613
Author(s):  
I. M. Fedorchenko
Keyword(s):  
Powder Metallurgy ◽  
New Materials

Manufacturing and Characterization of AA1100 Aluminum Alloy Metal Matrix Composites Reinforced by Silicon Carbide and Alumina Processed by Powder Metallurgy

2016 ◽  
Vol 869 ◽  
pp. 447-451 ◽  
Author(s):  
Oscar Olimpio Araújo Filho ◽  
Alexandre Douglas Araújo de Moura ◽  
Everthon Rodrigues de Araújo ◽  
Maurílio José dos Santos ◽  
Cezar Henrique Gonzalez ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Silicon Carbide ◽  
Aluminum Alloy ◽  
Powder Metallurgy ◽  
Aluminum Alloys ◽  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Matrix Composites ◽  
New Materials ◽  
Aa1100 Aluminum Alloy

Powder Metallurgy (PM) Techniques consists in a suitable technique to process composites materials. A specific PM technique of mechanical alloying developed to produce new materials in the solid state is a consolidated route to obtain aluminum alloys metal matrix composites. Aluminum alloys metal matrix composites allies the good properties of aluminum and its alloys but with poor mechanical properties and the reinforcement of ceramics phases which add better mechanical properties to these alloys. The research of this materials processing by PM techniques presented new materials with improved properties. In this work an AA1100 aluminum alloy was reinforced by particulate silicon carbide and alumina types of ceramic phases. The powders were mixed and then processed by mechanical alloying in a SPEX vibratory type mill. Then the powders obtained were compacted and vacuum sintered. The sintered composites were characterized by means of Scanning Electron Microscopy (SEM) plus Energy Dispersive Spectroscopy (EDS) and Vickers hardness (HV) tests to evaluate the mechanical behavior.

Features of the Processing of AA2124 Aluminum Alloy Metal Matrix Composites Reinforced by Silicon Nitride Prepared by Powder Metallurgy Techniques

2014 ◽  
Vol 802 ◽  
pp. 108-113 ◽  
Author(s):  
Carlos Augusto Bezerra ◽  
Alexandre Douglas Araújo de Moura ◽  
Edval Gonçalves de Araújo ◽  
Maurílio José dos Santos ◽  
Oscar Olimpio de Araújo Filho
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Silicon Nitride ◽  
Powder Metallurgy ◽  
Aluminum Alloys ◽  
Mechanical Alloying ◽  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Matrix Composites ◽  
New Materials

Powder Metallurgy (PM) Techniques consists in a suitable technique to process composites materials. A specific PM technique of mechanical alloying developed to produce new materials in the solid state is a well known route to obtain aluminum alloys metal matrix composites. Aluminum alloys metal matrix composites allies the good properties of aluminum and its alloys but with poor mechanical properties and the reinforcement of ceramics phases which add better mechanical properties to these alloys. The research of this materials processing by PM techniques presented new materials with improved properties. In this work an AA2124 aluminum alloy was reforced by particulated silicon nitride a kind of ceramic phase. The powders were mixed and then processed by mechanical alloying in a SPEX vibratory type mill. Then the powders obtained were compacted and vacuum sintered. The sintered composites were characterized by means of Scanning Electron Microscopy (SEM) plus Energy Dispersive Spectroscopy (EDS) and Vickers hardness tests to evaluate the mechanical behavior.

A new type of defect structure in 124-superconducting oxide revealed by HREM

1991 ◽  
Vol 49 ◽  
pp. 1092-1093
Author(s):  
R. Sharma ◽  
B.L. Ramakrishna ◽  
N.N. Thadhani ◽  
D. Hianes ◽  
Z. Iqbal
Keyword(s):  
Shock Wave ◽  
Defect Structure ◽  
Neutron Radiation ◽  
Weak Links ◽  
Defect Structures ◽  
New Materials ◽  
New Type ◽  
Current Densities ◽  
Processing Techniques ◽  
Microstructural Studies

After materials with superconducting temperatures higher than liquid nitrogen have been prepared, more emphasis has been on increasing the current densities (Jc) of high Tc superconductors than finding new materials with higher transition temperatures. Different processing techniques i.e thin films, shock wave processing, neutron radiation etc. have been applied in order to increase Jc. Microstructural studies of compounds thus prepared have shown either a decrease in gram boundaries that act as weak-links or increase in defect structure that act as flux-pinning centers. We have studied shock wave synthesized Tl-Ba-Cu-O and shock wave processed Y-123 superconductors with somewhat different properties compared to those prepared by solid-state reaction. Here we report the defect structures observed in the shock-processed Y-124 superconductors.

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