Effect of Tool Pin Profile on the Microstructure and Tribological Properties of Friction Stir Processed Al-20 wt% Mg2Si Composite

2019 ◽  
Vol 141 (12) ◽  
Author(s):  
A. Moharrami ◽  
A. Razaghian ◽  
M. Emamy ◽  
R. Taghiabadi
Keyword(s):  
Tribological Properties ◽  
Composite Surface ◽  
Cast Composite ◽  
Friction Stir ◽  
Pin On Disc ◽  
Processed Sample ◽  
Tool Pin ◽  
Sliding Distance ◽  
Primary Crystals

Abstract This study was undertaken with the aim of modifying the microstructure and improving the tribological properties of in situ Al-20Mg2Si composite. For this purpose, friction stir processing (FSP) was applied on the composite at constant travel and rotation speeds of 110 mm/min and 1500 rpm, respectively, using three different tool pin profiles: threaded tapered cylindrical, triangular tapered, and triangular threaded tapered. The sliding wear tests were conducted using a pin-on-disc apparatus under the applied load of 30 N and sliding distance of 1000 m at room temperature. The results showed that FSP substantially improved tribological properties of the as-cast composite. The best result was observed in the sample processed by the threaded triangular tapered tool, where compared with the as-cast composite, its wear rate and average friction coefficient decreased by almost 40% and 18%, respectively. This improvement can be attributed to the significant refinement and uniform redistribution of Mg2Si intermetallics, especially the coarse irregular-shaped primary crystals, the formation of ultrafine grains, and elimination of casting defects from the substrate microstructure of the processed sample, which improves its hardness and increased its potential in supporting the oxide tribolayer on the composite surface.

Improving the Tribological Properties of Mg Based AZ31 Alloy Using Friction Stir Processing

2012 ◽  
Vol 585 ◽  
pp. 579-583 ◽  
Author(s):  
H.S. Arora ◽  
Harpreet Singh ◽  
B.K. Dhindaw ◽  
Harpreet S. Grewal
Keyword(s):  
Tribological Properties ◽  
Friction Stir Processing ◽  
Volume Fraction ◽  
Wear Test ◽  
Az31 Alloy ◽  
Second Phase ◽  
Matrix Composites ◽  
Friction Stir ◽  
Pin On Disc ◽  
Modification Technique

Materials with improved tribological properties have become the pre-requisite of advanced engineering design. Surface metal matrix composites (SMMCs) exhibit a unified combination of good tribological properties and high toughness of the interior bulk metal when compared with monolithic materials. Friction stir processing, a microstructure modification technique, has emerged as one of the processes used for fabrication of SMMCs. Commercial cast or wrought type Mg–Al–Zn AZ-series alloys, such as AZ91, AZ61 or AZ31 with 3–9 wt.% Al and 1 wt.% Zn, have been widely used in automobiles or electronic appliances. Due to low percentage of alloying elements/second phase elements in these alloys, the grain refinement and hence the mechanical properties such as hardness cannot be appreciably enhanced. In this study, FSP was used to fabricate AZ31 based nanocomposite using TiC as reinforcement. FSP was performed at a fixed volume fraction of TiC under varying cooling conditions. Tribological performance of the fabricated composite was investigated using pin-on-disc wear test arrangement. The analysis of the wear surfaces as well as wear debris analysis was done using SEM equipped with EDS. The fabricated composite was found to exhibit superior wear resistance.

Tribological behaviour of recursive friction stir processed AA7075

2020 ◽  
Vol 72 (7) ◽  
pp. 887-894 ◽  
Author(s):  
Girish G. ◽  
Anandakrishnan V.
Keyword(s):  
Peer Review ◽  
Tribological Properties ◽  
Testing Machine ◽  
Traverse Speed ◽  
Wear Testing ◽  
Tribological Behaviour ◽  
Content Type ◽  
Friction Stir ◽  
Pin On Disc ◽  
7075 Alloy

Purpose This study aims to investigate and present the tribological behaviour of recursively friction stir processed 7075 aluminium alloy. Design/methodology/approach In this work, aluminium 7075 alloy is friction stir processed recursively by varying the tool rotational speed, traverse speed and the number of passes. Wear pins for testing were extracted from the processed zone and the surfaces were prepared. Wear tests were conducted as per the standard on a pin-on-disc wear testing machine at constant testing conditions and the corresponding tribological properties were analysed. The worn surface and the debris were analysed using a field-emission scanning electron microscope with energy dispersive spectroscopy analysis and elemental mapping to identify the mode of wear mechanism. Findings The experimental results indicate that the specimen fabricated at 1,150 rpm of tool rotation speed and 60 mm/min of traverse speed with 4 passes had the highest wear resistance and the minimum friction coefficient. Originality/value This paper details the effect of recursive friction stir processing on the surface of AA 7075 to improve the tribological properties. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-02-2020-0070/

Effect of Multiaxial Cryoforging on Wear Properties of Cu-1.5%Ti Alloy

2019 ◽  
Vol 969 ◽  
pp. 392-397 ◽  
Author(s):  
S. Ramesh ◽  
H. Shivananda Nayaka
Keyword(s):  
Cryogenic Temperature ◽  
Sliding Wear ◽  
Frictional Coefficient ◽  
Wear Test ◽  
Optical Microscope ◽  
Dry Sliding Wear ◽  
Wear Properties ◽  
Pin On Disc ◽  
Processed Sample ◽  
Sliding Distance

Copper-Titanium alloy was subjected to multi axial forging (MAF) at cryogenic temperature. Microstructure evolution was observed using optical microscope (OM). After 9 pass of MAF, grain size reduced to 2 µm. As number of MAF pass increases, hardness of the sample increased, due to strain hardening effect. Dry sliding wear test was performed on as-received and MAF processed samples using pin on disc wear machine. Tests were performed at 30 N and 40 N loads at 3 m/s constant speed and at 1000 m and 2000 m, sliding distance. Scanning Electron Microscope (SEM) and EDS was used to analyze the worn-out surface of the specimen. Wear mass loss of MAF processed sample reduced, with increased number of MAF passes. Frictional Coefficient (COF) reduced with increase in MAF passes and improved with increase in load, because of increase in contact area between sample and disc.

Microstructure and tribological properties of in-situ Y2O3/Ti-5Si alloy composites

2010 ◽  
Vol 101 (11) ◽  
pp. 1347-1353
Author(s):  
Yongzhong Zhan ◽  
Xinjiang Zhang ◽  
Wenchao Yang ◽  
Qingxiao Huang
Keyword(s):  
Tribological Properties

scholarly journals Tribological Properties of Al2O3 Nanoparticles as Lithium Grease Additives

Lubricants ◽  
2021 ◽  
Vol 9 (1) ◽  
pp. 9
Author(s):  
Ahmed Nabhan ◽  
Ahmed Rashed ◽  
Nouby M. Ghazaly ◽  
Jamil Abdo ◽  
M. Danish Haneef
Keyword(s):  
Tribological Properties ◽  
Wear Scar ◽  
Al2o3 Nanoparticles ◽  
Lithium Grease ◽  
Pin On Disc ◽  
Scar Width

The tribological properties of Lithium grease specimens with different concentrations of Al2O3 nanoparticles were investigated using a pin on disc apparatus under different sliding speeds and normal loads. Results showed that Al2O3 nanoparticles enhanced the tribological properties of lithium grease and reduced the COF and wear scar width by approximately 57.9% and 47.5% respectively.

Tribological Properties and Tool Wear in Milling of in-situ TiB2/7075 Al Composite under Various Cryogenic MQL Conditions

2021 ◽  
pp. 107021
Author(s):  
Jie Chen ◽  
Weiwei Yu ◽  
Zhenyu Zuo ◽  
Yugang Li ◽  
Dong Chen ◽  
...  
Keyword(s):  
Tool Wear ◽  
Tribological Properties ◽  
Al Composite
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