scholarly journals Effect of CeO2 Content on Microstructure and Properties of SiCp/Al-Si Composites Prepared by Powder Metallurgy

Materials ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4685
Author(s):  
Xuedan Dong ◽  
Aiqin Wang ◽  
Jingpei Xie ◽  
Pengfei Zhu
Keyword(s):  
Powder Metallurgy ◽  
Tensile Properties ◽  
Aluminum Matrix ◽  
Dispersion Strengthening ◽  
Microstructure And Properties ◽  
Pinning Effect ◽  
Mixed Fracture ◽  
New Phase ◽  
Properties Of Composites

The effect of CeO2 content on the microstructure and properties of SiCp/Al-Si composites prepared by powder metallurgy was studied, and the mechanism of CeO2 in composites was deeply analyzed. The results show that the addition of the appropriate amount of CeO2 can refine the Si particles and improve the tensile properties of the SiCp/Al-Si composites. As the CeO2 content increases from 0 to 0.4 vol%, the particle size of the Si phase shows a tendency to decrease first and then increase, while the tensile strength, yield strength, and elongation of the composites show a trend of first increasing and then decreasing. When the CeO2 content is 0.2 vol%, the refining effect of CeO2 and the tensile properties of composites are the best. The fracture mode of SiCp/Al-Si composites with a rare earth addition is a mixed fracture. There are three main mechanisms for CeO2 in SiCp/Al-Si composites. One is when CeO2 serves as the nucleation substrate of Si phase to refine Si particles. The second is when CeO2 reacts with the alloying elements in the aluminum matrix to form a new phase, CeCu2Si2, which can not only play a role of dispersion strengthening, but also improve the bonding strength between Al matrix and Si particles. The third is the pinning effect of CeO2 and CeCu2Si2 particles on grain boundaries or phase boundaries to refine aluminum grains.

Effect of Ca, Sc and Er Microalloying on the Microstructure and Properties of AZ61 Alloys by Electromagnetic Casting

2010 ◽  
Vol 146-147 ◽  
pp. 1825-1830
Author(s):  
Zheng Ren ◽  
Jian Min Song ◽  
Xiu Rong Zhu ◽  
Gu Xin Zhou ◽  
Xin Bing Zhao ◽  
...  
Keyword(s):  
Tensile Properties ◽  
Experimental Results ◽  
Microstructure And Properties ◽  
Az61 Alloy ◽  
Electromagnetic Casting ◽  
Ca Addition ◽  
New Phase

The effect of Ca, Sc and Er microalloying on the microstructure and properties of AZ61 alloys by electromagnetic casting are investigated. Experimental results show that an addition of Ca, Sc and Er refine the grains and compounds of AZ61 alloy. Mg17-xCaxAl12 phase are obtained after Ca addition. When the Ca, Sc and Er added in AZ61 alloy, some new phase contain Ca, Sc and Er are appeared. The tensile properties are improved as a result of grains and compounds refinement arter Ca, Sc and Er microalloying.

Tensile Properties of Aluminum Matrix Composites Reinforced with Submicron SiC Particles

2010 ◽  
Vol 150-151 ◽  
pp. 538-541 ◽  
Author(s):  
Chun Lin He ◽  
De Yuan Lou ◽  
Jian Ming Wang ◽  
Qing Kui Cai
Keyword(s):  
Tensile Properties ◽  
Aluminum Matrix ◽  
Damage Mechanism ◽  
Tensile Fracture ◽  
Aluminum Matrix Composites ◽  
Matrix Composites ◽  
Dispersion Strengthening ◽  
Sic Particles ◽  
Sic Particulates ◽  
Aluminum Metal Matrix Composites

The submicron SiC particulates reinforced aluminum metal matrix composites (Al MMCs) were fabricated by powder metallurgy technique, and their microstructure and tensile properties were investigated. The results show that the Al MMCs obviously exhibit an increase in ultimate tensile strength and yield strength due to both dislocation density strengthening and dispersion strengthening mechanisms, and a decrease in elongation with increasing concentration of SiC particles compared with those of the unreinforced Al due to the agglomeration of SiC superfine particles. The tensile fracture surfaces show that the damage mechanism of the Al MMCs can change with the concentrations of SiC superfine particles and the cracks easily originate from the SiC agglomerations.

The role of MgO nanoparticles addition, and γ-irradiation on the microstructural, and tensile properties of Al-1100 alloy

2021 ◽  
pp. 002199832098341
Author(s):  
Gh Mohammed ◽  
S El-Gamal
Keyword(s):  
Tensile Properties ◽  
Load Transfer ◽  
Density Measurement ◽  
Aluminum Matrix ◽  
Average Crystallite Size ◽  
Aluminum Matrix Composites ◽  
Matrix Composites ◽  
Γ Irradiation ◽  
Load Carrying

Aluminum matrix composites (AMCs) are innovative engineering materials in which a tough reinforcement is included in the aluminum matrix to improve its properties. In the study, MgO (0–4  wt.%) was loaded to Al-1100. The XRD reveals that MgO has a cubic crystal structure, purity of 100 %, and the average crystallite size is 17.4 nm, from Scherer's formula. HR-TEM reflected that MgO displays nanoparticle-like morphology. The microstructural properties of AMCs manifested the intermetallic compounds’ absence, grain refinement, good MgO distribution, and the presence of few porosities. The density measurement confirmed the decrease in the experimental density with increasing MgO while the theoretical density increased. The maximum porosity found is 1.4 % which is accepted in the fabrication of AMCs. The tensile properties revealed that as the strain rate ([Formula: see text]), γ-irradiation dose, and MgO content increases, the fracture stress ([Formula: see text]) increases while the ductility (εΤ) decreases. These three parameters could control the tensile properties of AMCs reinforced with MgO as well. An improvement by 140 % in σf was achieved for AMC with 4  wt.% MgO (at [Formula: see text] = 1.2 × 10−3 s−1, 2 MGy) compared to plain Al-1100 alloy (at [Formula: see text] = 5.4 × 10−5 s−1, 0 Gy). It was suggested that the load transfer from matrix to reinforcement was efficient which directly improves the load-carrying ability of these synthesized AMCs. Several mechanisms such as Orowan strengthening, and dislocation strengthening, were suggested to interpret the tensile properties.

Effect of Titanium Carbide Particles on Mechanical Properties of Aluminum Matrix Composites

2017 ◽  
Vol 5 (2) ◽  
pp. 20-30
Author(s):  
Zaman Khalil Ibrahim
Keyword(s):  
Mechanical Properties ◽  
Titanium Carbide ◽  
Compression Strength ◽  
Volume Fraction ◽  
Aluminum Matrix ◽  
Aluminum Matrix Composites ◽  
Matrix Composites ◽  
Powder Metallurgy Technique ◽  
Carbide Particles ◽  
Properties Of Composites

In this research aluminum matrix composites (AMCs) was reinforced by titanium carbide (TiC) particles and was produced. Powder metallurgy technique (PM) has been used to fabricate AMCs reinforced with various amounts (0%, 4%, 8%, 12%, 16% and 20% volume fraction) of TiC particles to study the effect of different volume fractions on mechanical properties of the Al-TiC composites. Measurements of compression strength and hardness showed that mechanical properties of composites increased with an increase in volume fraction of TiC Particles. Al-20 % vol. TiC composites exhibited the best properties with hardness value (97HRB) and compression strength value (275Mpa).

WIELAND DURO TANTALUM

Alloy Digest ◽  
2020 ◽  
Vol 69 (11) ◽  
Keyword(s):  
High Temperature ◽  
Powder Metallurgy ◽  
Physical Properties ◽  
Tensile Properties ◽  
Refractory Metal ◽  
Temperature Performance

Abstract Wieland Duro Tantalum is unalloyed tantalum that is produced from powder metallurgy consolidated ingots. It is a versatile refractory metal that is used in demanding applications requiring resistance to high temperature and corrosion. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on low and high temperature performance as well as machining and joining. Filing Code: Ta-14. Producer or source: Wieland Duro GmbH.

CARPENTER MICRO-MELT 10

Alloy Digest ◽  
1996 ◽  
Vol 45 (7) ◽  
Keyword(s):  
Fracture Toughness ◽  
Wear Resistance ◽  
Powder Metallurgy ◽  
Physical Properties ◽  
Tensile Properties ◽  
Tool Steel ◽  
Good Strength ◽  
Refined Microstructure ◽  
Strength And Toughness

Abstract Micro-Melt 10 is a high-vanadium tool steel A11 produced with a refined microstructure by powder metallurgy. The tool steel possesses superior wear resistance with good strength and toughness. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on wear resistance as well as forming and machining. Filing Code: TS-542. Producer or source: Carpenter.

scholarly journals Role of carbon and nitrogen in the improvement of corrosion resistance of new powder metallurgy Co-Cr-Mo alloys

2020 ◽  
Vol 38 (3) ◽  
pp. 273-286 ◽  
Author(s):  
Cristina Garcia-Cabezon ◽  
Celia Garcia-Hernandez ◽  
Maria L. Rodriguez-Mendez ◽  
Gemma Herranz ◽  
Fernando Martin-Pedrosa
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Powder Metallurgy ◽  
Nitrogen Content ◽  
Powder Metallurgy Technique ◽  
Carbon And Nitrogen ◽  
Physiological Conditions ◽  
Carbon And Nitrogen Content ◽  
Astm F75

AbstractMicrostructural changes that result in relevant improvements in mechanical properties and electrochemical behavior can be induced using different sintering conditions of ASTM F75 cobalt alloys during their processing using powder metallurgy technique. It has been observed that the increase in carbon and nitrogen content improves corrosion resistance and mechanical properties as long as the precipitation of carbides and nitrides is avoided, thanks to the use of rapid cooling in water after the sintering stage. In addition, the reduction of the particle size of the powder improves hardness and resistance to corrosion in both acid medium with chlorides and phosphate-buffered medium that simulates the physiological conditions for its use as a biomaterial. These results lead to increased knowledge of the role of carbon and nitrogen content in the behavior displayed by the different alloys studied.

The Rhetorical Case: Its Roman Precedent and the Current Debate

1989 ◽  
Vol 19 (3) ◽  
pp. 203-226 ◽  
Author(s):  
Michael Mendelson
Keyword(s):  
Problem Solving ◽  
Technical Writing ◽  
Current Debate ◽  
Case Study Method ◽  
Full Spectrum ◽  
Problem Solving Skills ◽  
Early Case ◽  
New Phase

Because of the recent emphasis on rhetorical context in business and technical writing (BTW) instruction, the problem-solving case has become a staple in BTW classrooms. However, a number of critics have voiced concerns about the use of the rhetorical case. These concerns recall an ancient debate among Roman rhetoricians over an early case-study method called declamation. For contemporary theorists, the debate over case study revolves around its value as a stimulant to problem-solving skills, its ability to imitate the realistic circumstances of professional BTW, and its emphasis on persona and audience along with its deemphasis of the teacher. A full spectrum of arguments on these and other issues in the case-study debate indicates that the discipline is entering a new phase in its deliberations over the role of problem-solving and pragmatics in the BTW classroom.

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