Sliding Tribological Behavior of Al–Fe–V–Si–Graphite Solid-Lubricating Composites at Elevated Temperatures

2017 ◽  
Vol 140 (1) ◽  
Author(s):  
Hui Tan ◽  
Shuai Wang ◽  
Jun Cheng ◽  
Shengyu Zhu ◽  
Jun Yang
Keyword(s):  
Elevated Temperatures ◽  
Matrix Composites ◽  
Wear Properties ◽  
Alloy Matrix ◽  
Graphite Composite ◽  
Mechanical And Tribological Properties ◽  
Lubricating Film ◽  
Effect Of Copper ◽  
Graphite Composites ◽  
Worn Surface

Aluminum alloy metal matrix composites (Al-MMCs) have been considered as promising materials for aerospace and automotive industries due to their excellent balance of physical, mechanical, and tribological properties. In the present work, the Al–Fe–V–Si alloy matrix composites with 0–20 wt. % copper-coated graphite were fabricated by hot-pressed sintering. The dry sliding tests were carried out at various temperatures ranging from room temperature (RT) to 350 °C. The microstructure, phase, hardness, and worn surface of the sintered composites were examined in detail. The effect of copper-coated graphite amount on the properties of the composite was also investigated. The results show that the Al–Fe–V–Si–graphite composites mainly consist of α-Al, Al8Fe2Si intermetallic, and graphite phases. The addition of Cu-coated graphite can decrease the friction coefficient and wear rate from RT to 350 °C. The Al–Fe–V–Si–graphite composite containing 10 wt. % copper-coated graphite exhibits better wear properties than other composites. The favorable lubricating properties were attributed to the tribolayer with graphite lubricating film formed on the worn surface.

Erosion-Abrasion Behavior of Eutectic Al-Mn Alloy Matrix Composites Reinforced with Al2O3 Particulates

2010 ◽  
Vol 152-153 ◽  
pp. 1054-1057
Author(s):  
Bing Liu ◽  
Xin Mei Li ◽  
Xiang Liu ◽  
Chun Yao Wang
Keyword(s):  
Solid Solution ◽  
Shear Stress ◽  
Impact Angle ◽  
Matrix Composites ◽  
Alloy Matrix ◽  
Abrasion Test ◽  
Wear Rates ◽  
Impact Angles ◽  
The Impact ◽  
Worn Surface

Effects of different impact angles such as 45°and 90°on the erosion-abrasion properties of eutectic Al-Mn alloy and its composites reinforced with Al2O3 particulates were studied by rotating erosion-abrasion test, and the microstructure and the worn surfaces were analyzed. The results show that the as-cast Al-Mn alloy is composed of aluminium-manganese solid solution, MnAl6 and Al11Mn4 phase, while the δ-Al2O3 particles are included in the composites besides the aforementioned microstructures. With elongating the erosion time, the wear rates of the Al-Mn alloy and its composites increase at the impact angle of 90°, whereas they firstly increase and then decrease , and there is a maximum at 45°. The distortion wear caused by the normal stress is dominant at 90°, which lead to the erosion pits on the worn surface. However, the cutting wear by the shear stress is predominant at 45°, which result in the ploughs.

Studies on Dry Sliding Wear Characteristics of Ceramic Al2O3 Particulate Reinforced 6061Al Matrix Composites

2014 ◽  
Vol 984-985 ◽  
pp. 319-325 ◽  
Author(s):  
V. Bharath ◽  
Madeva Nagaral ◽  
V. Auradi ◽  
S.A. Kori
Keyword(s):  
Sliding Wear ◽  
Testing Machine ◽  
Stir Casting ◽  
Wear Testing ◽  
Dry Sliding Wear ◽  
Dry Sliding ◽  
Matrix Composites ◽  
Wear Properties ◽  
Alloy Matrix ◽  
Particulate Reinforced

In the current investigation an attempt has been made and to produce ceramic Al2O3particulate reinforced 6061Al matrix composites by liquid metallurgy route (stir casting technique) and to study the dry sliding wear properties of the prepared composites. The amount of ceramic Al2O3particulate reinforcement addition was maintained at 9 and 12wt%. During the preparation of each composite the ceramic reinforcements were introduced in a novel way which involves three stage additions of reinforcements during melt stirring. The wear tests were conducted using pin on disc wear testing machine on 6061Al matrix before and after addition of Al2O3reinforcements Wear test results demonstrated the superior wear resistance of the composites over monolithic 6061Al alloy matrix. Key Words: MMC’s, Al2O3particulates, 6061Al, stir-casting

Tribological Properties and Wear Mechanism of Copper-Graphite Composite

2012 ◽  
Vol 472-475 ◽  
pp. 618-621 ◽  
Author(s):  
Li Li Duan ◽  
Xu Ran
Keyword(s):  
Wear Rate ◽  
Tribological Properties ◽  
Friction And Wear ◽  
Mechanically Alloyed ◽  
Graphite Composite ◽  
Plasma Sintering ◽  
Pin On Disc ◽  
Spark Plasma ◽  
Graphite Composites ◽  
Worn Surface

Copper-graphite composites were fabricated by spark plasma sintering (SPS) and cold-pressed (CP) processing using a mixture of copper and graphite powders mechanically alloyed. Pin-on-disc wear was used to evaluate the tribological behavior of copper-graphite composites. The results show that the coefficient friction and wear rate decreased considerably with increasing graphite content; with increasing the sintering temperature, the coefficient friction and wear rate just decreased in the same way. XPS analysis of worn surface indicated that better tribological properties are due to a lubricious film covering almost entire worn surface. The presence of this tribolayer improves the friction and wear characteristics when the tribolayer covers almost entire wear surface it effectively restricts metal to metal contact between pin and disc.

A Novel Computational Strategy to Enhance the Ability of Elaborate Search by Entire Swarm to Find the Best Solution in Optimization of AMCs

2012 ◽  
Vol 332 ◽  
pp. 27-33 ◽  
Author(s):  
Mohsen Ostad Shabani ◽  
Ali Mazahery
Keyword(s):  
Metal Matrix ◽  
Optimization Method ◽  
Dynamic Environments ◽  
Population Based ◽  
Matrix Composites ◽  
Alloy Matrix ◽  
Swarm Optimization ◽  
Mechanical And Tribological Properties ◽  
Swarming Behavior ◽  
Computational Strategy

Al 6061 alloy matrix reinforced with the coated B4C particles have been used to investigate the accuracy of a novel optimization method. Population-based optimization was inspired by the swarming behavior as is displayed by a social behavior being influenced by other individuals. The present article focuses on a method of re-evaluating a number of randomly chosen sentry particles to detect the change of environments. A comprehensive population-based optimization method was developed to optimize the mechanical and tribological properties in metal matrix composites using Multi-strategy ensemble particle swarm optimization. In this method, the particles are divided into two parts which are considered to play different roles in searching for dynamic environments by using different strategies. The global best used in part one is the best solution found by all particles, both in part one and part two.

scholarly journals Aluminum Based Metal Matrix Composites Behavioral Studies with Different Reinforcements- A Review

2021 ◽  
Vol 9 (10) ◽  
pp. 1816-1822
Author(s):  
Paramjit Singh
Keyword(s):  
Mechanical Properties ◽  
Metal Matrix ◽  
Density Ratio ◽  
High Strength ◽  
Stir Casting ◽  
Matrix Composites ◽  
Wear Properties ◽  
Mechanical And Tribological Properties ◽  
Behavioral Studies ◽  
Transportation Applications

Abstract: Aluminum alloy’s widely employed in transportation applications like: aerospace, aviation, marine and automobile sector due to their good mechanical properties, wear properties, corrosion behavior and high strength to density ratio. The current review article mainly highlights the effects of various reinforcements on mechanical and tribological properties of aluminum based metal matrix composite materials and focuses on the types of different reinforcements. Review revealed that, there is significant improvement in mechanical properties of AMMC’s with different reinforcements as compared to traditional base alloys. The reinforcements may be SiC, TiO2 , Al2O3 , fly ash, B4C, fiber, Zircon are incorporated in the stir casting or other methods. Keywords: AMMC, Reinforcements, Mechanical properties, Stir casting etc.

scholarly journals The Evaluation of Physicomechanical and Tribological Properties of Corn Straw Fibre Reinforced Environment-Friendly Friction Composites

2019 ◽  
Vol 2019 ◽  
pp. 1-9
Author(s):  
Zhen-yu Wang ◽  
Jie Wang ◽  
Yun-hai Ma
Keyword(s):  
Tribological Properties ◽  
Friction And Wear ◽  
Corn Stalk ◽  
Wear Properties ◽  
Environment Friendly ◽  
Mechanical And Tribological Properties ◽  
Friction Tester ◽  
Mechanical And Physical Properties ◽  
Friction And Wear Properties ◽  
Worn Surface

Corn stalk fibre reinforced nonasbestos environment-friendly friction composite materials have been fabricated, and their physical, mechanical, and tribological properties are characterized. The tribological properties of the friction composites were evaluated following GB5763-2008 norms on a constant-speed-type friction tester. The experimental outcome reveals that the content of corn stalk fibre has a noteworthy impact on the tribological, mechanical, and physical properties of the friction composites. Specifically, the friction composite with a content of 7% exhibited excellent friction and wear properties. The worn surface morphology of friction composites was further investigated using a scanning electron microscope. It was found that the corn stalk fibre content greatly affected the tribological properties of the friction composites.

Mechanical and Wear Properties of SiC/Graphite Reinforced Al359 Alloy-based Metal Matrix Composite

2015 ◽  
Vol 65 (4) ◽  
pp. 330 ◽  
Author(s):  
Shubhranshu Bansal ◽  
J. S. Saini
Keyword(s):  
Silicon Carbide ◽  
Wear Test ◽  
Casting Process ◽  
Stir Casting ◽  
Wear Properties ◽  
Sem Images ◽  
Graphite Composite ◽  
Reinforced Composite ◽  
Worn Surface ◽  
Distance Conditions

<p>Al359 alloy was reinforced with Silicon Carbide and Silicon Carbide/Graphite particles using stir casting process. Thereafter their mechanical and wear properties were investigated. It was found that the hardness of the Al359-Silicon Carbide composite is better than Al359-Silicon Carbide-Graphite composite. The Silicon Carbide/Graphite reinforced composite exhibits a superior ultimate tensile strength against Silicon Carbide reinforced composite. The wear test was conducted at different loading, sliding velocities and sliding distances conditions. Results showed that the wear resistance of Al359 alloy increased with the reinforcement of Silicon Carbide/Graphite material for higher loading, sliding velocities and sliding distance conditions. SEM images of the worn surface of the pin were examined to study their wear mechanism.</p><p><strong>Defence Science Journal, Vol. 65, No. 4, July 2015, pp. 330-338, DOI: http://dx.doi.org/10.14429/dsj.65.8676</strong></p>

Wear Behaviors of MoSi2 at Elevated Temperatures

2008 ◽  
Vol 368-372 ◽  
pp. 961-963
Author(s):  
Hou An Zhang ◽  
Xiao Pin Hu ◽  
Wei Cheng Tan ◽  
Cun Shi
Keyword(s):  
Wear Rate ◽  
Friction And Wear ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Vacuum Furnace ◽  
Wear Properties ◽  
Brittle Transition ◽  
Deformation And Fracture ◽  
Friction And Wear Properties ◽  
Worn Surface

MoSi2 was prepared by SHS, and then pressed under 300 MPa at room temperature and sintered at 1600 °C for 1 h in a vacuum furnace. The tribological properties of MoSi2 against Al2O3 in the temperature range from 700°C to 1100 °C were investigated. Microphotographs and phases of the worn surface of MoSi2 were observed by SEM and XRD. Results showed that MoSi2 has well friction and wear properties below 900 °C. When temperature rises from 900 °C to 1000 °C, wear rate of MoSi2 is raised by 20.8% which is attribute to the change of wear mechanism. The main wear mechanisms of MoSi2 are adhesion and oxidation at high temperatures. When over 900 °C, because of ductile - brittle transition characteristic of this material, plastic deformation and fracture are also found on the worn surface of MoSi2. This leads to the high wear rate of MoSi2.

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