Friction stir processing (FSP) was used to incorporate tungsten particles in 5083 Al matrix to fabricate metal particle reinforced surface composites. The particles were uniformly dispersed in the matrix and the grain size was also refined by FSP. X-Ray diffraction analysis showed no intermetallic peak confirming that the tungsten particles remained in their elemental form. The composite surface layer exhibited considerably higher wear resistance compared to the base and friction stir processed (FSPed) alloy. The worn surface analysis revealed that the composite undergoes adhesive and oxidative type of mild wear at all the three loads whereas there was a transition to abrasive and delamination type of severe wear at higher loads in the base and FSPed samples. © 2016 Elsevier Ltd. All rights reserved.

Ranjit Bauri

Department of Metallurgical and Materials Engineering

Aluminum

Friction

Friction stir welding

PARTICLE REINFORCED COMPOSITES

Surface analysis

tribology

Tungsten

Wear of materials

Wear resistance

X ray diffraction analysis

COMPOSITE SURFACE

Friction stir

Friction stir processing

METAL PARTICLE

Sliding

SURFACE COMPOSITES

Surface engineering

WEAR PROPERTIES

Metallic matrix composites

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

Tribology International

Tungsten particles were incorporated into an Al 5083 matrix by friction stir processing (FSP). FSP resulted in uniform dispersion of the tungsten particles with excellent interfacial bonding and more importantly without the formation of any harmful intermetallics. For the first time, the particles penetrated to a depth equal to the full pin length of the tool. A novel aspect of the 5083 Al-W composite is that it showed an improvement of more than 100. MPa in the UTS and at the same time exhibited a high ductility (30%). The ductility was also evident from the well defined dimples in the fracture surface which also revealed the superior bonding between the particles and the matrix. FSP also resulted in substantial grain refinement of the Al matrix. Electron backscatter diffraction (EBSD) and transmission electron microscopy analysis revealed that the fine grains formed by dynamic recrystallization. A gradual transformation from sub-grain to high-angle grain boundaries was observed from EBSD analysis pointing towards the occurrence of a continuous type of dynamic recrystallization process. © 2014 Elsevier B.V.

Materials Science and Engineering A

Tungsten particle reinforced Al 5083 composite with high strength and ductility

Nickel particles were embedded into an Al matrix by friction stir processing (FSP) to produce metal particle reinforced composite. FSP resulted in uniform dispersion of nickel particles with excellent interfacial bonding with the Al matrix and also lead to significant grain refinement of the matrix. The novelty of the process is that the composite was processed in one step without any pretreatment being given to the constituents and no harmful intermetallic formed. The novel feature of the composite is that it shows a three fold increase in the yield strength while appreciable amount of ductility is retained. The hardness also improved significantly. The fracture surface showed a ductile failure mode and also revealed the superior bonding between the particles and the matrix. Electron backscattered diffraction (EBSD) and transmission electron microscopy analysis revealed a dynamically recrystallized equiaxed microstructure. A gradual increase in misorientation from sub-grain to high-angle boundaries is observed from EBSD analysis pointing towards a continuous type dynamic recrystallization mechanism. © 2010 Elsevier B.V.

Processing, microstructure and mechanical properties of nickel particles embedded aluminium matrix composite

Nickel particulate reinforced aluminium matrix composite was processed without formation of deleterious Al3Ni intermetallic by friction stir processing (FSP). FSP resulted in uniform dispersion of nickel particles in the aluminium matrix with excellent interfacial bonding and also lead to grain refinement of the matrix. The composite exhibited a threefold increase in the yield stress (0.2% proof stress). The most novel feature of the composite is that an appreciable amount of ductility is retained while the strength increases significantly. The microstructure evolution was studied by transmission electron microscopy and electron backscattered diffraction analysis. EBSD analysis showed a dynamically recrystallized equiaxed microstructure having a considerable fraction of low-angle boundaries. TEM observations revealed that these low-angle boundaries are essentially subgrain boundaries formed by dislocation rearrangement and absorption during friction stir processing. © 2009 Elsevier B.V. All rights reserved.

Materials Letters

Nickel particle embedded aluminium matrix composite with high ductility

Study of the effect of friction stir processing of the sliding wear behavior of cast NiAl bronze: A statistical analysis

Wear properties of friction stir processed AISI D2 tool steel

Wear properties of 5083 Al-W surface composite fabricated by friction stir processing

Journal	Data powered by TypesetTribology International
Publisher	Data powered by TypesetElsevier Ltd
ISSN	0301679X
Open Access	No