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Papers by bsb reddy

Metallurgical and Materials Transactions A, 2007

Nanocrystalline zirconia powder has been synthesized by an aqueous combustion synthesis route usi... more Nanocrystalline zirconia powder has been synthesized by an aqueous combustion synthesis route using glycine as fuel and nitrate as oxidizer. The powders have been prepared by using different glycine to zirconyl nitrate molar ratios (G/N). The powders produced with different ...

Journal of Materials Science, 2007

Journal of Alloys and Compounds, 2010

Al matrix hybrid nanocomposite is synthesized from a powder blend of Al—12% (wt) NiO—15% (wt) TiO... more Al matrix hybrid nanocomposite is synthesized from a powder blend of Al—12% (wt) NiO—15% (wt) TiO 2 by combined mechanical and thermal activation (mechanical thermal synthesis). The powder blends are mechanically activated by high energy ball milling ...

Journal of Alloys and Compounds, 2010

Al matrix hybrid nanocomposite is synthesized from a powder blend of Al—12% (wt) NiO—15% (wt) TiO... more Al matrix hybrid nanocomposite is synthesized from a powder blend of Al—12% (wt) NiO—15% (wt) TiO 2 by combined mechanical and thermal activation (mechanical thermal synthesis). The powder blends are mechanically activated by high energy ball milling ...

Journal of Alloys and …, 2009

The paper reports the study on the synthesis and characterization of nanocomposites reinforced wi... more The paper reports the study on the synthesis and characterization of nanocomposites reinforced with in-situ intermetallic compounds via mechanical–thermal activation. The Al matrix bulk hybrid nanocomposites are synthesized by an aluminothermic reduction reaction between the ...

Journal of Alloys and …, 2010

The zirconia–alumina nanocomposite powders with 3–48 mol% of alumina are prepared by aqueous comb... more The zirconia–alumina nanocomposite powders with 3–48 mol% of alumina are prepared by aqueous combustion synthesis technique using stoichiometric amounts of aluminium nitrate, zirconyl nitrate and glycine. The nanopowders are compacted uniaxially and sintered at ...

Nanotechnology, 2008

Nanostructured nickel matrix composites reinforced with nanosized, undoped, tetragonal zirconia h... more Nanostructured nickel matrix composites reinforced with nanosized, undoped, tetragonal zirconia has been synthesized by cathodic pulsed electrodeposition. The reinforcement is synthesized by the aqueous combustion synthesis route with glycine as the fuel and zirconyl nitrate as the oxidizer. The reinforcement and composite have been characterized by XRD, TEM and SEM coupled with EDS. The microhardness and thermal stability (Kissinger method) of the composite are evaluated. These values are compared with those of pure nickel deposited under the same conditions. The results show that the microhardness of the nickel matrix is enhanced by the presence of the reinforcement from 450 to 575 VHN. Also the strengthening due to grain size effects and dispersion strengthening effect are evaluated individually and the interparticle separation is estimated to be around 85 nm. The volume fraction of the reinforcement is estimated to be 12-15% and the particles are uniformly distributed and monodispersed in the nickel matrix. The thermal stability of the composite is better than that of pure nickel in contrast to some of the reported literature.

Metallurgical and Materials …, 2007

Nanocrystalline zirconia powder has been synthesized by an aqueous combustion synthesis route usi... more Nanocrystalline zirconia powder has been synthesized by an aqueous combustion synthesis route using glycine as fuel and nitrate as oxidizer. The powders have been prepared by using different glycine to zirconyl nitrate molar ratios (G/N). The powders produced with different ...

Journal of Materials Science, 2007

The aim of the present paper is to review the recent progress in the synthesis of in situ particl... more The aim of the present paper is to review the recent progress in the synthesis of in situ particle reinforced aluminum composites using thermal, mechanical and combined mechanical-thermal activation of aluminother-mic reduction reactions. The combination ...

Materials Science and Engineering: …, 2007

The aim of the present work is to produce aluminum matrix nanocomposite powders by displacement r... more The aim of the present work is to produce aluminum matrix nanocomposite powders by displacement reaction between aluminum and ceria and to study the effect of high-energy ball milling on the onset temperature for the reduction reaction. If the onset temperature for the reduction ...

Journal of Alloys and …, 2008

Aluminum-based metal matrix composites reinforced with in situ Al 3 Ni and Al 2 O 3 hybrid reinfo... more Aluminum-based metal matrix composites reinforced with in situ Al 3 Ni and Al 2 O 3 hybrid reinforcements are prepared by the mechanically activated, self propagating, high temperature synthesis (MASHS). The composites are fabricated from the powder blends consisting of aluminum ...

Metallurgical and Materials Transactions A, 2007

Nanocrystalline zirconia powder has been synthesized by an aqueous combustion synthesis route usi... more Nanocrystalline zirconia powder has been synthesized by an aqueous combustion synthesis route using glycine as fuel and nitrate as oxidizer. The powders have been prepared by using different glycine to zirconyl nitrate molar ratios (G/N). The powders produced with different ...

Journal of Materials Science, 2007

Journal of Alloys and Compounds, 2010

Al matrix hybrid nanocomposite is synthesized from a powder blend of Al—12% (wt) NiO—15% (wt) TiO... more Al matrix hybrid nanocomposite is synthesized from a powder blend of Al—12% (wt) NiO—15% (wt) TiO 2 by combined mechanical and thermal activation (mechanical thermal synthesis). The powder blends are mechanically activated by high energy ball milling ...

Journal of Alloys and Compounds, 2010

Al matrix hybrid nanocomposite is synthesized from a powder blend of Al—12% (wt) NiO—15% (wt) TiO... more Al matrix hybrid nanocomposite is synthesized from a powder blend of Al—12% (wt) NiO—15% (wt) TiO 2 by combined mechanical and thermal activation (mechanical thermal synthesis). The powder blends are mechanically activated by high energy ball milling ...

Journal of Alloys and …, 2009

The paper reports the study on the synthesis and characterization of nanocomposites reinforced wi... more The paper reports the study on the synthesis and characterization of nanocomposites reinforced with in-situ intermetallic compounds via mechanical–thermal activation. The Al matrix bulk hybrid nanocomposites are synthesized by an aluminothermic reduction reaction between the ...

Journal of Alloys and …, 2010

The zirconia–alumina nanocomposite powders with 3–48 mol% of alumina are prepared by aqueous comb... more The zirconia–alumina nanocomposite powders with 3–48 mol% of alumina are prepared by aqueous combustion synthesis technique using stoichiometric amounts of aluminium nitrate, zirconyl nitrate and glycine. The nanopowders are compacted uniaxially and sintered at ...

Nanotechnology, 2008

Nanostructured nickel matrix composites reinforced with nanosized, undoped, tetragonal zirconia h... more Nanostructured nickel matrix composites reinforced with nanosized, undoped, tetragonal zirconia has been synthesized by cathodic pulsed electrodeposition. The reinforcement is synthesized by the aqueous combustion synthesis route with glycine as the fuel and zirconyl nitrate as the oxidizer. The reinforcement and composite have been characterized by XRD, TEM and SEM coupled with EDS. The microhardness and thermal stability (Kissinger method) of the composite are evaluated. These values are compared with those of pure nickel deposited under the same conditions. The results show that the microhardness of the nickel matrix is enhanced by the presence of the reinforcement from 450 to 575 VHN. Also the strengthening due to grain size effects and dispersion strengthening effect are evaluated individually and the interparticle separation is estimated to be around 85 nm. The volume fraction of the reinforcement is estimated to be 12-15% and the particles are uniformly distributed and monodispersed in the nickel matrix. The thermal stability of the composite is better than that of pure nickel in contrast to some of the reported literature.

Metallurgical and Materials …, 2007

Nanocrystalline zirconia powder has been synthesized by an aqueous combustion synthesis route usi... more Nanocrystalline zirconia powder has been synthesized by an aqueous combustion synthesis route using glycine as fuel and nitrate as oxidizer. The powders have been prepared by using different glycine to zirconyl nitrate molar ratios (G/N). The powders produced with different ...

Journal of Materials Science, 2007

The aim of the present paper is to review the recent progress in the synthesis of in situ particl... more The aim of the present paper is to review the recent progress in the synthesis of in situ particle reinforced aluminum composites using thermal, mechanical and combined mechanical-thermal activation of aluminother-mic reduction reactions. The combination ...

Materials Science and Engineering: …, 2007

The aim of the present work is to produce aluminum matrix nanocomposite powders by displacement r... more The aim of the present work is to produce aluminum matrix nanocomposite powders by displacement reaction between aluminum and ceria and to study the effect of high-energy ball milling on the onset temperature for the reduction reaction. If the onset temperature for the reduction ...

Journal of Alloys and …, 2008

Aluminum-based metal matrix composites reinforced with in situ Al 3 Ni and Al 2 O 3 hybrid reinfo... more Aluminum-based metal matrix composites reinforced with in situ Al 3 Ni and Al 2 O 3 hybrid reinforcements are prepared by the mechanically activated, self propagating, high temperature synthesis (MASHS). The composites are fabricated from the powder blends consisting of aluminum ...