Paper Title:
Solid-State Reaction in Al-Fe Binary System Induced by Mechanical Alloying
  Abstract

Mechanical alloying (MA) is a solid-state powder processing method which has the ability to synthesize a variety of new alloy phases including supersaturated solid solutions, nanocrystalline structures, amorphous phases and intermetallic compounds. In this investigation, the interaction between aluminum and iron caused by MA of Fe-xAl (where X ranged from 30 to 90%) was studied as a function of milling time and post heat-treating temperatures. The sequences of structural and/or phase transformation and the behavior of mechanically alloyed powders have been assessed using XRD, hardness and magnetometer. It was found that during mechanical milling of elemental powder Al and Fe, five milling stages were categorized, namely, particle flattening, welding predominance, equiaxed formation, random welding orientation and steady state composite particles. All milled powders showed nano-sized powder mixtures after milling for 20hrs. When Fe-30%Al powder was milled for 150hrs, a partially ordered AlFe phase was obtained. However, when these saturated solid solutions were heat treated at 500 °C, the AlFe intermetallic was precipitated fully ordered. When the Al content was increased up to 40% and milled for 50hr, the XRD pattern showed a broad halo spectrum which showed the formation of an amorphous phase. When a Fe-60%Al powder mixture was mechanically milled for 50hr, the Al5Fe2 intermetallic formed that was associated with an amorphous phase, which transformed into the Al3Fe intermetallic by heat treating at 500°C. In the case of Fe-75% and Fe-90%Al milled for 150hrs only Al peaks appeared and were shifted to higher angles, suggesting that Fe atoms diffused into Al, leading to the formation of a solid solution.

  Info
Periodical
Edited by
D. J. Fisher
Pages
15-24
DOI
10.4028/www.scientific.net/DDF.272.15
Citation
S.H. Kaytbay, S.F. Moustafa, W.M. Daoush, "Solid-State Reaction in Al-Fe Binary System Induced by Mechanical Alloying ", Defect and Diffusion Forum, Vol. 272, pp. 15-24, 2007
Online since
March 2008
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Guo Xian Liang, Robert Schulz
93
Authors: H.F. Li, R.V. Ramanujan
Abstract:Mechanical alloying (MA) is a widely used processing technique to prepare metastable or nanophase materials in a cost effective fashion. In...
187
Authors: Kui Bao Zhang, Zheng Yi Fu, Jin Yong Zhang, Wei Min Wang, Hao Wang, Yu Cheng Wang, Qing Jie Zhang
Abstract:The equiatomic multicomponent CoCrFeNiCuAl high-entropy alloy powder was synthesized by mechanical alloying. The effects of milling time and...
383
Authors: H. Kaffash, Ali Shokuhfar, Hamid Reza Rezaie, Ehsan Mostaed, Ali Mostaed
Abstract:Fabrication of alloys in the solid state via mechanical alloying (MA) process has been studied by earlier researchers. The effects of milling...
1262
Authors: Amir Reza Shirani-Bidabadi, Ali Shokuhfar, Mohammad Hossein Enayati, Mazda Biglari
Abstract:In this research, the formation mechanisms of a (NiCr)Al-Al2O3 nanocomposite were investigated. The structural changes of powder particles...
21