Entity

Time filter

Source Type


Tailor S.,Malaviya National Institute of Technology, Jaipur | Sharma V.K.,Malaviya National Institute of Technology, Jaipur | Mohanty R.M.,Nonferrous Materials Technology Development Center | Soni P.R.,Malaviya National Institute of Technology, Jaipur
Proceedings of the Euro International Powder Metallurgy Congress and Exhibition, Euro PM 2011 | Year: 2011

2024 Aluminum alloy with 15wt. %SiCp composite was produced by P/M processing. Mechanical alloying (MA) technique was used to mill the blended powder under purified nitrogen. The results of MA processing have been investigated with SEM, EDAX and XRD. The results show that the matrix particle size and crystallize size reduced after MA and homogeneous distribution of SiCp reinforcement in the matrix could be obtained. The MA processed powder has also been used for plasma spraying and the morphology, hardness and phases present in the coatings have been discussed. The MA processing also results in cold worked structure, contamination due to oxygen, iron and carbon in the matrix.


Jayakumar P.K.,Nonferrous Materials Technology Development Center | Balasubramanian K.,Nonferrous Materials Technology Development Center | Rabindranath Tagore G.,National Institute of Technology Tiruchirappalli
Eurasian Chemico-Technological Journal | Year: 2011

Ultra fine grained copper is produced by equal channel angular processing (ECAP) routes. Multiple passing through the ECAP die reveals high grain refinement in first few passes. Transmission electron microscopies in to the samples reveal a grain refinement of 150 μm to 500 nm sized grains after 4 passes. Mechanical properties measuerement shows that the severe plastic deformation has improved the structural strength to 410 MPa. Structure property study confirms the Hall petch strengthening mechanism operational during the deformation process. The effect of initial microstructral inhomogeniety is investigated and it is found to have marginal influence in the grain refinement of the multiple pass ECAP. Process modeling study using finite element models reveal the developed shear strain and stress fields during the deformtion process. © 2011 al-Farabi Kazakh National University.


Jayakumar P.K.,Nonferrous Materials Technology Development Center | Balasubramanian K.,Nonferrous Materials Technology Development Center | Rabindranath Tagore G.,National Institute of Technology Tiruchirappalli
Materials Science and Engineering A | Year: 2012

The structure, thermal stability and diffusion bonding behaviour of oxygen free high conductivity copper (OFHC), and Cu-Cr-Zr alloy (CRZ) with ultra fine grains (UFG) produced by severe plastic deformation through equal-channel angular pressing (ECAP) are investigated. Microstructural study reveals a grain refinement from 150 μm to 200. nm sized grains after 8 ECAP passes. Thermal stability of ECAP processed OFHC and CRZ has been investigated. Both OFHC and CRZ show hardness reduction at temperatures above 100°C. However CRZ exhibits grain size stability up to a temperature of 500°C. Diffusion bonding studies reveal that bond strengths of ~54. MPa are developed between ECAP processed CRZ and OFHC at a lower temperature of 500°C when compared to annealed materials. © 2011 Elsevier B.V.


Patent
Nonferrous Materials Technology Development Center | Date: 2010-03-24

A molten metal casting die having a modified surface, a method for making such dies, and a method for making articles of manufacture from such dies is disclosed. The methods are designed to protect die steel surfaces from corrosion by molten metals substantially containing liquid copper.


Mathew J.,Indian National Institute of Engineering | Mohanty R.M.,Nonferrous Materials Technology Development Center | Sundaresan R.,Nonferrous Materials Technology Development Center | Sivan V.,Indian National Institute of Engineering | Balasubramanian K.,Nonferrous Materials Technology Development Center
Fusion Engineering and Design | Year: 2010

Vacuum plasma etching of 1 wt% La2O3 doped tungsten alloy surfaces were carried out to refine the surface morphology for enhancing its bonding characteristics with copper for fusion reactor components. Three different gas compositions containing argon with zero, 14.3 and 25 vol% hydrogen were used to carry out the plasma etching from 30 to 120 s on the given samples. Mitutoyo surface roughness (Ra) measurement, FORM TALYSURF and scanning electron microscopy (SEM) were employed to measure the changes in the surface roughness. Plasma etching with 14.3 vol% hydrogen mixture was found to be the best in micro-roughening the alloy surface. The maximum increase of 44% in Ra value was obtained with this gas mixture, when etched for 90 s. © 2010 Elsevier B.V.

Discover hidden collaborations