Please use this identifier to cite or link to this item: http://hdl.handle.net/2080/1980
Title: Evaluation of Microstructure and Mechanical Properties of Nano-Y2O3-Dispersed Ferritic Alloy Synthesized by Mechanical Alloying and Consolidated by High-Pressure Sintering
Authors: Karak, S K
Majumdar, J D
Witczak, Z
Lojkowski, W
Ciupin, L
Kurzydłowski, K J
Manna, I
Keywords: Y2O3 dispersed ferritic alloys
mechanical alloying
high pressure sintering
Xray diffraction
microstructure
mechanical properties
Issue Date: 2013
Publisher: The Minerals, Metals & Materials Society and ASM International 2013
Citation: Metallurgical and Materials Transactions A, Volume 44A, June 2013—2885
Abstract: In this study, an attempt has been made to synthesize 1.0 wt pct nano-Y2O3-dispersed ferritic alloys with nominal compositions: 83.0 Fe-13.5 Cr-2.0 Al-0.5 Ti (alloy A), 79.0 Fe-17.5 Cr- 2.0 Al-0.5 Ti (alloy B), 75.0 Fe-21.5 Cr-2.0 Al-0.5 Ti (alloy C), and 71.0 Fe-25.5 Cr-2.0 Al- 0.5 Ti (alloy D) steels (all in wt pct) by solid-state mechanical alloying route and consolidation the milled powder by high-pressure sintering at 873 K, 1073 K, and 1273 K (600C, 800C, and 1000C) using 8 GPa uniaxial pressure for 3 minutes. Subsequently, an extensive effort has been undertaken to characterize the microstructural and phase evolution by X-ray diffraction, scanning and transmission electron microscopy, and energy dispersive spectroscopy. Mechanical properties including hardness, compressive strength, Young’s modulus, and fracture toughness were determined using micro/nano-indentation unit and universal testing machine.The present ferritic alloys record extraordinary levels of compressive strength (from 1150 to 2550 MPa), Young’s modulus (from 200 to 240 GPa), indentation fracture toughness (from 3.6 to 15.4 MPam), and hardness (from13.5 to 18.5 GPa) and measure up to 1.5 through 2 times greater strength but with a lower density (~7.4 Mg/m3) than other oxide dispersion-strengthened ferritic steels (<1200 MPa) or tungsten-based alloys (<2200 MPa). Besides superior mechanical strength, the novelty of these alloys lies in the unique microstructure comprising uniform distribution of either nanometric (~10 nm) oxide (Y2Ti2O7/Y2TiO5 or un-reacted Y2O3) or intermetallic (Fe11TiY and Al9.22Cr2.78Y) particles’ ferritic matrix useful for grain boundary pinning and creep resistance.
Description: Copyright belongs to The Minerals, Metals & Materials Society and ASM International 2013
URI: http://dx.doi.org/10.1007/s11661-013-1627-9
http://hdl.handle.net/2080/1980
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