scholarly journals Microstructure and Mechanical Behavior of Hot Pressed Cu-Sn Powder Alloys

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Ahmed Nassef ◽  
Medhat El-Hadek
Keyword(s):  
Wear Resistance ◽  
Compressive Strength ◽  
Mechanical Behavior ◽  
Compression Fracture ◽  
Intermetallic Phases ◽  
Limited Area ◽  
Lower Strength ◽  
Powder Alloys ◽  
Significant Difference ◽  
Release Of Load

Cu-Sn based alloy powders with additives of elemental Pb or C were densified by hot pressing technique. The influence of densifying on the properties of the hot pressed materials was investigated. The properties, such as the hardness, compressive strength, and wear resistance of these materials, were determined. The hot pressed Cu-Sn specimens included intermetallic/phases, which were homogeneously distributed. The presence of graphite improved the wear resistance of Cu-Sn alloys three times. Similarly, the presence of lead improved the densification parameter of Cu-Sn alloys three times. There was no significant difference in the mechanical behavior associated with the addition of Pb to the Cu-Sn alloys, although Cu-Pb alloys showed considerably higher ultimate strength and higher elongation. The Cu-Sn-C alloys had lower strength compared with those of Cu-Sn alloys. Evidence of severe melting spots was noticed in the higher magnifications of the compression fracture surface of 85% Cu-10% Sn-5% C and 80% Cu-10% Sn-10% Pb alloys. This was explained by the release of load at the final event of the fracture limited area.

scholarly journals Influence of Cooling Methods on the Residual Mechanical Behavior of Fire-Exposed Concrete: An Experimental Study

Materials ◽  
2019 ◽  
Vol 12 (21) ◽  
pp. 3512 ◽  
Author(s):  
Espedito Felipe Teixeira de Carvalho ◽  
João Trajano da Silva Neto ◽  
Paulo Roberto Ribeiro Soares Junior ◽  
Priscila de Souza Maciel ◽  
Helder Luis Fransozo ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Ambient Temperature ◽  
Mechanical Behavior ◽  
Residual Strength ◽  
Maximum Temperature ◽  
Experimental Program ◽  
Lower Strength ◽  
Cooling Method ◽  
Temperature Levels ◽  
Cooling Methods

This work reports the main conclusions of a study on the mechanical behavior of concrete under ISO 834 fire with different cooling methods. The aim of this research was to provide reliable data for the analysis of structures damaged by fire. The experimental program used cylindrical concrete test specimens subjected to ISO 834 heating in a furnace up to maximum gas temperatures of 400, 500, 600, 700, and 800 °C. The compressive strength was measured in three situations: (a) at the different temperature levels reached in the furnace; (b) after a natural cooling process; and (c) after aspersion with water at ambient temperature. The results indicate that the concrete residual compressive strength is fairly dependent on the maximum temperature reached in the furnace and revealed that concrete of a lower strength preserved relatively higher levels of strength. The cooling method significantly influenced the strength, albeit at a lower intensity. In all cases, the residual strength remained in the range of 38% to 67% of the strength at ambient temperature. The statistical analysis showed that the data obtained by the experimental program are significant and confirmed the influence of the conditions imposed on the residual strength.

Application of TEM to Deformation, Wear, and Fracture of Ceramics

1974 ◽  
Vol 32 ◽  
pp. 472-473
Author(s):  
B. J. Hockey
Keyword(s):  
Wear Resistance ◽  
High Temperature ◽  
Mechanical Behavior ◽  
Brittle Materials ◽  
High Temperature Strength ◽  
Wide Range ◽  
Corrosive Environments ◽  
Further Development

Ceramics, such as Al2O3 and SiC have numerous current and potential uses in applications where high temperature strength, hardness, and wear resistance are required often in corrosive environments. These materials are, however, highly anisotropic and brittle, so that their mechanical behavior is often unpredictable. The further development of these materials will require a better understanding of the basic mechanisms controlling deformation, wear, and fracture.The purpose of this talk is to describe applications of TEM to the study of the deformation, wear, and fracture of Al2O3. Similar studies are currently being conducted on SiC and the techniques involved should be applicable to a wide range of hard, brittle materials.

The influence of the addition of ground olive stone on the thermo-mechanical behavior of compressed earth blocks

2020 ◽  
Vol 108 (2) ◽  
pp. 203
Author(s):  
Samia Djadouf ◽  
Nasser Chelouah ◽  
Abdelkader Tahakourt
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Mechanical Behavior ◽  
Agricultural Waste ◽  
Hydraulic Press ◽  
Dry Density ◽  
Olive Stone ◽  
Compressed Earth Blocks ◽  
Clay Matrix ◽  
Earth Blocks

Sustainable development and environmental challenges incite to valorize local materials such as agricultural waste. In this context, a new ecological compressed earth blocks (CEBS) with addition of ground olive stone (GOS) was proposed. The GOS is added as partial clay replacement in different proportions. The main objective of this paper is to study the effect of GOS levels on the thermal properties and mechanical behavior of CEB. We proceeded to determining the optimal water content and equivalent wet density by compaction using a hydraulic press, at a pressure of 10 MPa. The maximum compressive strength is reached at 15% of the GOS. This percentage increases the mechanical properties by 19.66%, and decreases the thermal conductivity by 37.63%. These results are due to the optimal water responsible for the consolidation and compactness of the clay matrix. The substitution up to 30% of GOS shows a decrease of compressive strength and thermal conductivity by about 38.38% and 50.64% respectively. The decrease in dry density and thermal conductivity is related to the content of GOS, which is composed of organic and porous fibers. The GOS seems promising for improving the thermo-mechanical characteristics of CEB and which can also be used as reinforcement in CEBS.

COLMONOY No. 83 PTA

Alloy Digest ◽  
1995 ◽  
Vol 44 (12) ◽  
Keyword(s):  
Wear Resistance ◽  
Compressive Strength ◽  
Physical Properties ◽  
Tungsten Carbide ◽  
Tensile Properties ◽  
Powder Metal ◽  
Application Method ◽  
Plasma Transferred Arc ◽  
Transferred Arc ◽  
Nickel Base

Abstract COLMONOY No. 83 PTA is a nickel-base hard surfacing alloy containing tungsten carbide. The application method is plasma transferred arc and the application is designed to protect extrusion screws. This datasheet provides information on composition, physical properties, microstructure, hardness, tensile properties, and compressive strength. It also includes information on wear resistance as well as machining and powder metal forms. Filing Code: Ni-493. Producer or source: Wall Colmonoy Corporation.

ABK METAL

Alloy Digest ◽  
1953 ◽  
Vol 2 (11) ◽  
Keyword(s):  
Wear Resistance ◽  
Compressive Strength ◽  
Cast Iron ◽  
Physical Properties ◽  
Tensile Properties ◽  
Heat Treating ◽  
Brake Shoe ◽  
Nickel Chromium ◽  
Chromium Cast Iron

Abstract ABK Metal is a nickel-chromium cast iron with excellent wear resistance, recommended for severe abrasive service. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and compressive strength. It also includes information on wear resistance as well as casting, heat treating, machining, and joining. Filing Code: CI-4. Producer or source: American Brake Shoe Company.

OLIN C197

Alloy Digest ◽  
1999 ◽  
Vol 48 (1) ◽  
Keyword(s):  
Thermal Conductivity ◽  
Wear Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
High Performance ◽  
Corrosion And Wear ◽  
Contact Forces ◽  
High Current ◽  
Lower Strength ◽  
Current Carrying Capability

Abstract Olin C197 is a second-generation high performance alloy developed by Olin Brass. It has a strength and bend formability similar to C194 (see Alloy Digest Cu-360, September 1978), but with 25% higher electrical and thermal conductivity. High conductivity allows C197 to replace brasses and bronzes in applications where high current-carrying capability is required. Also, the strength of C197 provides higher contact forces when substituted for many lower strength coppers. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion and wear resistance as well as forming and joining. Filing Code: CU-627. Producer or source: Olin Brass.

COMPAX

Alloy Digest ◽  
1988 ◽  
Vol 37 (3) ◽  
Keyword(s):  
Wear Resistance ◽  
Compressive Strength ◽  
Physical Properties ◽  
Surface Treatment ◽  
Tool Steel ◽  
Dimensional Stability ◽  
Heat Treating ◽  
High Toughness ◽  
Steel Corporation

Abstract COMPAX is a chromium-molybdenum shock-resistant tool steel characterized by high toughness, good wear resistance, good through hardening and good dimensional stability during hardening. This datasheet provides information on composition, physical properties, hardness, elasticity, and compressive strength. It also includes information on heat treating, machining, joining, and surface treatment. Filing Code: TS-488. Producer or source: Uddeholm Steel Corporation.

CIRCLE M

Alloy Digest ◽  
1953 ◽  
Vol 2 (9) ◽  
Keyword(s):  
Wear Resistance ◽  
Compressive Strength ◽  
Physical Properties ◽  
High Speed ◽  
High Speed Steel ◽  
Heat Treating ◽  
High Production ◽  
Red Hardness

Abstract CIRCLE M is a molybdenum-tungsten high-speed steel containing 9.0% cobalt. It is adapted to high production applications where increased speeds and heavy cuts necessitate unusual red-hardness and wear resistance. This datasheet provides information on composition, physical properties, elasticity, and compressive strength. It also includes information on forming, heat treating, and machining. Filing Code: TS-10. Producer or source: Firth Sterling Corporation.

GRAPH-AIR

Alloy Digest ◽  
1991 ◽  
Vol 40 (6) ◽  
Keyword(s):  
Fracture Toughness ◽  
Wear Resistance ◽  
Compressive Strength ◽  
Tensile Properties ◽  
Tool Steel ◽  
Heat Treating ◽  
Steel Company

Abstract GRAPH-AIR is an air hardening, non-deforming tool steel with outstanding wear resistance and toughness. it contain uniformly distributed graphic particles for good machinability and non-seizing characteristics. This datasheet provides information on composition, hardness, tensile properties, and compressive strength as well as fracture toughness. It also includes information on forming, heat treating, machining, and joining. Filing Code: TS-75. Producer or source: Latrobe Steel Company. Originally published October 1958, revised April 1984, June 1991.

AISI TYPE M2

Alloy Digest ◽  
1972 ◽  
Vol 21 (2) ◽  
Keyword(s):  
Fracture Toughness ◽  
Wear Resistance ◽  
Compressive Strength ◽  
Physical Properties ◽  
High Speed ◽  
High Speed Steel ◽  
Heat Treating ◽  
General Purpose ◽  
Steel Mills ◽  
Aisi Type

Abstract AISI TYPE M2 is a molybdenum-tungsten high-speed steel with a balanced analysis which produces properties applicable to all general-purpose high-speed uses. It has an excellent balance between toughness and wear resistance. This datasheet provides information on composition, physical properties, hardness, and compressive strength as well as fracture toughness. It also includes information on forming, heat treating, machining, and joining. Filing Code: TS-240. Producer or source: Tool steel mills.

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