Effect of Mn Modification on the Tribological Properties of In Situ Al-15Mg2Si Composites Containing Fe as an Impurity

2018 ◽  
Vol 140 (6) ◽  
Author(s):  
A. Nadim ◽  
R. Taghiabadi ◽  
A. Razaghian
Keyword(s):  
Tribological Properties ◽  
Sliding Wear ◽  
Negative Impact ◽  
Wear Behavior ◽  
Harmful Effect ◽  
Chinese Script ◽  
Surface Plastic ◽  
Wear Properties ◽  
Near Surface

The effect of Mn modification on the tribological properties of Al-15Mg2Si-(0.5-2)Fe composites was investigated. The sliding wear tests were conducted under the applied pressures of 0.25, 0.5, and 1.0 MPa at the constant sliding speed of 0.13 m/s. According to the results, the behavior of FeMn-rich intermetallics against the strains induced by sliding wear has an important role in the wear behavior of composites. In low-Fe composites (0.5–1 wt % Fe), Mn promotes the formation of Chinese script α-Al15(Fe,Mn)3Si2 phases instead of harmful β-Al5FeSi platelets. The formation of these compounds strengthens the substrate and decreases its microcracking tendency giving rise to a more stable tribolayer and improved wear properties. At the higher Fe contents, Mn modification leads to the formation of primary polyhedral or star-like α-Al15(Fe,Mn)3Si2 compounds in the microstructure and substantially neutralizes the harmful effect of the primary β-Fe crystals on the wear behavior. However, when subjected to the friction-induced surface plastic strains, the near-surface α-FeMn particles fracture and incorporate into the tribolayer making it unstable and less protective. The tribolayer stability in Mn-modified composites decreases the chance of adhesion between contacting surfaces, and, under low applied pressures, lowers the average friction coefficient (AFC) and its fluctuation. At higher applied pressures, however, the nonmodified composites exhibit lower AFC, which is probably due to the negative impact of β-Fe fragments on the tribolayer shear strength.

Microstructure and Wear Properties of In Situ TiC-Cr7C3/Fe Surface Composite

2011 ◽  
Vol 415-417 ◽  
pp. 170-173
Author(s):  
Jing Wang ◽  
Si Jing Fu ◽  
Yi Chao Ding ◽  
Yi San Wang
Keyword(s):  
Sliding Wear ◽  
Wear Behavior ◽  
Wear Test ◽  
Dry Sliding Wear ◽  
Dry Sliding ◽  
Test Machine ◽  
Wear Properties ◽  
Surface Composite ◽  
The Matrix

A wear resistant TiC-Cr7C3/Fe surface composite was produced by cast technique and in-situ synthesis technique. The microstructure and dry-sliding wear behavior of the surface composite was investigated using scanning electron microscope(SEM), X-ray diffraction(XRD) and MM-200 wear test machine. The results show that the surface composite consists of TiC and Cr7C3as the reinforcing phase, α-Fe and γ-Fe as the matrix. The surface composite has excellent wear-resistance under dry-sliding wear test condition with heavy loads.

Dry Sliding Wear Behavior of Hot Forged and Annealed Cu-Cr-SiС In Situ Composite

2012 ◽  
Vol 736 ◽  
pp. 207-217
Author(s):  
R.K. Gautam ◽  
Satish C. Sharma ◽  
S.C. Jain ◽  
Subrata Ray
Keyword(s):  
Tribological Properties ◽  
Sliding Wear ◽  
Composite System ◽  
Wear Behavior ◽  
Hot Forging ◽  
Copper Matrix ◽  
Dry Sliding Wear ◽  
Processing Conditions ◽  
Selection Of

In-situ composites offer a wide selection of constituent and an opportunity for understanding the mechanisms their mechanical properties so that intelligent decisions may be taken while tailoring a composite for a specific application. Properties of material are basically governed by the constituent phases and their distribution and depend on the composition and processing conditions. In the present investigation tribological properties of hot forged Cu-Cr-SiC and annealed after hot forging system are proposed to be studied by addition of Cr and SiC into the copper matrix. The effect of constituent phases on tribological properties after hot forged and annealed after hot forged has been investigated. It is expected to enhance the understanding of tribological properties in this presented work for the hot forged Cu-Cr-SiC composite system.

Sliding Wear Behavior of Remelted Al2O3-TiO2 Plasma Sprayed Coatings on Titanium

2016 ◽  
Vol 254 ◽  
pp. 231-236 ◽  
Author(s):  
Ion Dragoş Uţu ◽  
Gabriela Marginean ◽  
Iosif Hulka ◽  
Viorel Aurel Şerban
Keyword(s):  
Sliding Wear ◽  
Wear Behavior ◽  
Pure Titanium ◽  
Titanium Substrate ◽  
Atmospheric Plasma ◽  
Wear Properties ◽  
Before And After ◽  
Sprayed Coating ◽  
Pin On Disk ◽  
Sprayed Coatings

Microstructure and wear properties of the Al2O3-13.wt% TiO2 thermally sprayed coatings before and after remelting were investigated in this study. The coatings were deposited on a pure titanium substrate using the atmospheric plasma spraying (APS) process. The as-sprayed coatings were electron beam (EB) modified in order to improve their compactness and bonding strength.The effect of EB remelting on the microstructure, phase constituents and wear properties was investigated using scanning electron microscopy (SEM), X-Ray diffraction technique and hardness measurements. The sliding wear behavior was tested using a pin on disk method.The results showed that the remelting process had a positive effect removing the lamellar defect of the as-sprayed coating and improving the compactness, hardness and wear behavior.

Interaction of a Sliding Wedge and a Metallic Specimen With a Near-Surface Inhomogeneity

2018 ◽  
Author(s):  
Vandana A. Salilkumar ◽  
Narayan K. Sundaram
Keyword(s):  
Sliding Wear ◽  
Surface Damage ◽  
Metal Substrate ◽  
Surface Plastic ◽  
Deformation Processing ◽  
Near Surface ◽  
Lagrangian Finite Element ◽  
Wedge Sliding ◽  
Metallic Specimen ◽  
Indenter Geometry

The problem of a hard wedge sliding against a metal substrate has been studied extensively for its importance in tribo-plasticity and deformation processing. Here we explore the effect of introducing a single, near-surface plastic inhomogeneity (termed as a pseudograin) in a metal substrate using Lagrangian finite element (FE) analysis. The pseudograin is allowed to be softer or harder than the surrounding material. The effects of sliding parameters like the size and location of the pseudograin, friction and indenter geometry are also studied. Interestingly, the introduction of the pseudograin can lead to production of surface folds / self-contacts, and acutely-inclined, near-surface, crack-like features, which cannot be reproduced by homogeneous specimens. In fact, this tribosystem is phenomenologically very rich, despite differing from classical triboplastic systems of Challen, Oxley and Torrance only by way of the inhomogeneity. Despite its simplicity, the model replicates several experimentally observed features of surface folding, and is a minimal model to obtain folding in sliding. The occurrence of surface folds and concomitant residual surface damage points to the important role played by microstructure-related inhomogeneities in determining surface quality in deformation processing operations (e.g. repeated sliding to generate UFG surfaces) and is also a potentially new mode of sliding wear.

Influence of reinforcing fiber on the dry sliding wear behavior of hybrid fabric/benzoxazine composites

2019 ◽  
Vol 89 (23-24) ◽  
pp. 5153-5164
Author(s):  
Meng Su ◽  
Lei Liang ◽  
Fang Ren ◽  
Weigang Yao ◽  
Mingming Yu ◽  
...  
Keyword(s):  
High Temperatures ◽  
Tribological Properties ◽  
Sliding Wear ◽  
Wear Behavior ◽  
Wear Test ◽  
Mechanical Analysis ◽  
Dry Sliding Wear ◽  
Fabric Composite ◽  
Fabric Composites ◽  
Wear Tests

Hybrid polyimide (PI)-polytetrafluoroethylene (PTFE)/Nomex fabric composites and Nomex-PTFE/Nomex fabric composites were prepared with benzoxazine (BOZ) as the resin binder. The tribological properties and wear mechanisms of the two composites at different temperatures were investigated using a ball-on-disk wear tester. Before sliding wear tests, a thermo-aging test, thermogravimetric analysis and dynamic mechanical analysis of PI and Nomex fibers were performed to evaluate the thermal properties of the two reinforcing fibers. After each wear test, scanning electron microscopy was employed to analyze the morphologies of the worn surfaces of the composite. The results of sliding wear tests show that the difference between the tribological properties of the two composites is small at room temperature. However, the hybrid PI-PTFE/Nomex fabric composite achieves better tribological properties at high temperatures compared with the hybrid Nomex-PTFE/Nomex fabric composite, which suffered wear failure at 240℃. It is proposed that the excellent thermal mechanical property and thermal stability of PI fibers is the main factor that endows the PI-PTFE/Nomex/BOZ composite with a more favorable tribological property at high temperatures. Moreover, the influence of the increasing temperature on the tribological properties of the two composites was also investigated.

Effect of Varying Wt% of TiC on Mechanical and Wear Properties of RZ5-TiC In-Situ Composite

2018 ◽  
Vol 8 (2) ◽  
pp. 45-56 ◽  
Author(s):  
Deepak Mehra ◽  
M.M. Mahapatra ◽  
S. P. Harsha
Keyword(s):  
Wear Resistance ◽  
Wear Behavior ◽  
Wear Test ◽  
X Ray Diffraction ◽  
Wear Properties ◽  
X Ray ◽  
Tic Particle ◽  
Mechanical And Microstructural Properties ◽  
Sliding Distance

The purpose of this article is to enhance the mechanical properties and wear resistance of the RZ5 alloy used in the aerospace application by adding TiC particles. The present study discusses processing of in-situ RZ5-TiC composite fabricated by self-propagating high temperature (S.H.S.) method and its wear behavior. The effects of TiC particle on mechanical and microstructural properties of the composite are studied. The wear test is performed by varying the sliding distance and applied load. The composite is characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). The results exhibited the properties like strength and hardness of RZ5-10wt%TiC composite has been increased considerably, while grain size is decreased as compared to the RZ5 alloy. The fractography indicated mixed mode (quasi-cleavage and ductile feature) failure of the composites. The wear results showed improvement in wear resistance of the composite. The FESEM showed dominate wear mechanisms are abrasion, ploughing grooves.

Sliding Wear Behaviour of Cu-10Fe-3Ag In Situ Composite

2011 ◽  
Vol 194-196 ◽  
pp. 1572-1576
Author(s):  
Yong Li ◽  
Dan Qing Yi ◽  
Rui Qing Liu ◽  
Shun Ping Sun
Keyword(s):  
Sliding Wear ◽  
Wear Behavior ◽  
Electrical Current ◽  
Copper Matrix ◽  
Wear Behaviour ◽  
Sliding Speed ◽  
Arc Erosion ◽  
In Situ Composite ◽  
Arc Melting

A deformation-processed Cu-10Fe-3Ag in situ composite was made by consumable arc melting and casting followed by extensive deformation. A superior combination of mechanical strength and electrical/thermal conductivity was achieved with the composite since Fe filaments existed in the copper matrix. The effects of sliding speed and electrical current on sliding wear behavior and microstructure of the composite were investigated on wear tester. Worn surfaces of the Cu-10Fe-3Ag in situ composite were analyzed by scanning electron microscopy (SEM). Within the studied range of electrical current and sliding speed, the wear rate increased with the increasing electrical current and the sliding speed. Compared with Cu-10Fe in situ composite under the same conditions, the Cu-10Fe-3Ag in situ composite had much better wear resistance. Adhesive wear, abrasive wear and arc erosion were the dominant mechanisms during the electrical sliding processes.

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