Paper Title:
Cellular Microstructure and Mechanical Properties of a Directionally Solidified Al-1.0wt%Fe Alloy
  Abstract

Upward directional transient solidification experiments have been carried out with an Al-1.0wt%Fe alloy. Tensile tests were carried out with samples collected along the casting length and these results have been correlated with measured cell spacings, since cellular growth has prevailed along the directionally solidified casting. The resulting mechanical properties include ultimate tensile strength, yield tensile strength and elongation. The used casting assembly was designed in such a way that the heat was extracted only through the water-cooled system at bottom of the casting. During non-equilibrium solidification, typical of DC (direct chill) castings, different cooling rates occur from the casting cooled surface up to the top of the casting, causing the formation of metastable intermetallic phases (AlmFe, Al6Fe, etc) in addition to the stable Al3Fe phase. The extensive presence of plate-like Al3Fe phase in the as-cast structure adversely influences the mechanical properties of Al-Fe alloys, since this morphology is more likely to induce microcracks than the fibrous Al6Fe phase. In order to permit an appropriate characterization of these intermetallic phases, they were extracted from the aluminum-rich matrix by using a dissolution technique. These phases were then investigated by optical microscopy and SEM techniques. It was found that the ultimate tensile strength, the yield strength and the elongation increase with decreasing cell spacing and experimental laws correlating cell spacing and these mechanical properties have been established.

  Info
Periodical
Materials Science Forum (Volumes 636-637)
Edited by
Luís Guerra ROSA and Fernanda MARGARIDO
Pages
564-570
DOI
10.4028/www.scientific.net/MSF.636-637.564
Citation
P. R. Goulart, J.E. Spinelli, F. Bertelli, W. R.R. Osório, N. Cheung, A. Garcia, "Cellular Microstructure and Mechanical Properties of a Directionally Solidified Al-1.0wt%Fe Alloy", Materials Science Forum, Vols. 636-637, pp. 564-570, 2010
Online since
January 2010
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: Hong Sheng Ding, Rui Run Chen, Yan Li Wang, Heng Zhi Fu, Jing Jie Guo, Wei Sheng Bi, Jun Jia
2575
Authors: Ai Qin Wang, Jing Pei Xie, Zhong Xia Liu, Ji Wen Li, Wen Yan Wang, Shu Qing Yan
Abstract:In the present work, rapidly solidified alloys strips with Al-0.24Ti and Al-21Si-0.24Ti(in wt.%) were prepared by single roller...
27
Authors: Xiang Jie Yang, Hong Min Guo
Abstract:Rheo-die casting (RDC) based on LSPSF (low superheat pouring with a shear field) rheocasting process has been exploited. In case of...
163
Authors: Guo Fa Mi, Cui Fen Dong, Chang Yun Li, Hai Yan Wang
Abstract:Cast, sub-rapidly solidified and rapidly solidified Al-5Fe alloy and Al-5Fe-3Y alloy were respectively prepared by vacuum melting, suction...
2462
Authors: S.G. Shabestari, R. Gholizadeh
Chapter 2: Forming in Melt or Near Melt Condition
Abstract:Dense precipitation of various intermetallic compounds is a common feature in the microstructure of Al-Si piston alloys. In this...
289