N. Gopalakrishna Nair

Suresh Krishnamoorthy Seshadri

Electroless plating

Magnetic moments

Magnetic variables measurement

Nickel

Scanning electron microscopy

titanium

Energy dispersive spectroscopy

Powder metals

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

Magnetic moment studies on nickel coated titanium powders

Journal of Materials Science Letters

The preparation of Ti, Al, Ni composite powders by coating Ni on Ti and Al elemental powders is discussed. The pretreatment given to the elemental powders also plays an important role in increasing the coating thickness. The increase in the amount of Ni can be indirectly measured by the magnetic moment test. This is the only method to incorporate the P in the alloy by powder metallurgy process. The composite powders can be used to prepare γ-TiAl alloys and can subsequently be used as a matrix material to prepare γ-TiAl alloy composites to improve their oxidation resistance, toughness and wear resistance. Addition of Ni to this alloy is expected to improve the oxidation resistance by replacing the Ti in the sublattice site instead of Al.

Scripta Materialia

Electroless nickel-phosphorus coating on Ti and Al elemental powders

The γ-TiAl/Ti2AlC composites with and without impurities, Ni, Cl and P, were prepared by combustion reaction from the elemental powders and homogenized after arc melting. The resulting composition is about 18 vol% Ti2AlC in the matrix of TiAl with a lamellar structure of Ti3Al (α2). In the homogenized specimens, the α2 phase transforms to the precipitated Ti2AlC particles in the place of solutionizing lamellar structure. The composite material has a high strength both at ambient and elevated temperatures; about 800 and 400 MPa, respectively, with an ambient temperature ductility of 0.7% at bending test. The fracture toughness test also proves the composite homogenized is better than the as cast and value is 17.8 MPam1/2. The crack propagation in the homogenized composite is zigzag mode and the precipitated particles are main obstacles for the crack propagation. The composite with impurities shows a marginal improvement in the oxidation resistance over the composites without impurities.

Fulltext

Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy

Microstructure and Properties of γ-TiAl/Ti2AlC Composites Produced by Reactive Processing from Elemental Powders

Journal	Data powered by TypesetJournal of Materials Science Letters
Publisher	Data powered by TypesetSpringer Netherlands
ISSN	02618028
Open Access	No