Paper Title:
Fabrication of Nano-MgO Reinforced Fe-Cr-Ni Composites by Reactive Hot Pressing
  Abstract

The self-propagating combustion reaction 0.741Mg + 0.247Fe2O3 + 0.188Ni + 0.318Cr → 0.741MgO + Fe0.494Ni0.188Cr0.318 was applied to prepare a nano-MgO reinforced Fe-Cr-Ni composite, by reactive hot pressing (RHP) under a condition of 700°C/30MPa/2h. The densification was enabled by the low temperatures produced by the exothermic reaction. According to TG-DTA and X-ray diffractometry (XRD), the highly-exothermic thermite reaction began at about 600°C and the in-situ formation of composites comprised predominantly of (FCC) Cr0.19Fe0.7Ni0.11, (FCC) Fe-Cr, (BCC) MgO and a small quantity of (BCC) MgFe2O4. The Vickers hardness was 3.67GPa, the three-point bending strength was 112.5±10MPa, and the fracture toughness was 3.28 MPa•m1/2. The microstructure of the composite was observed via scanning electron microscopy. This indicated that the distributions of in-situ-formed (BCC) MgO phases (~800 nanometers) were homogeneous into in a matrix of a fine-grained metallic alloy phases that gather together to form agglomerates in the composite.

  Info
Periodical
Materials Science Forum (Volumes 620-622)
Edited by
Hyungsun Kim, JienFeng Yang, Tohru Sekino and Soo Wohn Lee
Pages
551-554
DOI
10.4028/www.scientific.net/MSF.620-622.551
Citation
C. Chen, J. F. Yang, J. Q. Gao, C. Y. Chu, "Fabrication of Nano-MgO Reinforced Fe-Cr-Ni Composites by Reactive Hot Pressing", Materials Science Forum, Vols. 620-622, pp. 551-554, Apr. 2009
Online since
April 2009
Price
US$ 28,-
Share
Authors: Nathan L. Canfield, Jarrod V. Crum, Josef Matyas, A. Bandyopadhyay, K. Scott Weil, Larry R. Pederson, John S. Hardy
Abstract:The potential for highly selective, nongalvanic permeation of hydrogen through dense mixed conducting composites at elevated temperatures...
1415
Authors: Filipe Neves, Isabel M. Martins, Jose Brito Correia, Manuela Oliveira, Eric Gaffet
Abstract:This study reports the use of X-ray diffraction quantitative phase analyses in NiTi alloys produced by MARES (Mechanically Activated...
625
Authors: Yi Shan Jiang, Jiang Hua Luo, Zhen Li, Lu Ning Chen
Chapter 9: Nano Materials
Abstract:Cornstalk fibers were modified with surface modification and the properties of cornstalk fiber/gypsum composites was studied. The results...
1162
Authors: Saet Byol Rim, Kyeong Il Kim, Tae Whan Hong, Mie Won Jung
Abstract:The Al2O3-CuO-ZnO (ACZ) was synthesized from sol-gel process with aluminum isopropoxide, copper (II) nitrate hemi...
251
Authors: Wan Hong Zang, Chang Lun Yuan, Yan Li
Abstract:Al2O3-TiC particles reinforced iron matrix functionally gradient material is successfully fabricated by combining the...
6