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Title: | Fabrication and Characterization of Nano–Y2O3 Dispersed Mechanically alloyed W-Ni-Nb for High Temperature Applications |
Authors: | Saxena, R Patra, A Karak, S K Ciupinski, L |
Keywords: | W-Ni-Nb alloy Mechanical alloying Oxide dispersion strengthening Hardness Oxidation |
Issue Date: | Nov-2016 |
Citation: | 4th International Conference on Advances in Materials and Materials Processing (iCAMMP-IV), IIT Kharagpur, West Bengal, India, 5-7 November 2016 |
Abstract: | The present research work deals with fabrication of nano-Y2O3 dispersed tungsten (W) based alloys with nominal composition of W79Ni10Nb10(Y2O3)1 (alloy A), W78Ni10Nb10(Y2O3)2 (alloy B) and W72Ni10Nb15(Y2O3)3 (alloy C) (all composition in wt.%) by mechanical alloying in a planetary ball mill and compaction at 500 MPa pressure followed by sintering at 1500°C for 2 h in Ar atmosphere. The milled powders at different milling time and the consolidated products have been investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM) and energy dispersive spectroscopy (EDS). Minimum crystallite size and maximum lattice strain of 20.3 nm and 0.42% respectively is achieved in alloy C. Maximum sinterability, hardness, compressive strength of 93.38%, 6 GPa, 2.5 GPa with appreciable wear resistance has been achieved in alloy C owing to the lower crystallite size, presence of higher oxide dispersion (Y2O3) and NbNi intermetallic. High temperature behavior of the sintered alloys is studied in a raising hearth furnace at a temperature range of 800-1000°C. The activation energy of oxidation decreases with increase in Y2O3 content owing to higher energy of Y2O3 dispersoids. Alloy A shows superior oxidation resistance at 800-1000°C as compared to rest of the alloys. The investigated alloys shows superior strength and elongation as compared to recently investigated W-Y2O3 alloys [1, 2]. |
URI: | http://hdl.handle.net/2080/2558 |
Appears in Collections: | Conference Papers |
Files in This Item:
File | Description | Size | Format | |
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2016_ICAMMP_APatra_Fabrication.pdf | 5.19 MB | Adobe PDF | View/Open |
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