Paper Title:
Microstructures and Thermal Stability of the Metastable-Phase Precipitates Formed in an Al-Cu Alloy
  Abstract

The precipitation behavior in an Al-Cu alloy isothermally annealed at 373K~493K was studied, using the Vickers microhardness tests, Differential scanning calorimetry(DSC) and Transmission electron microscope(TEM) observations. An additional endothermic peak was found in DSC measurements which may be attributed to the θ″-phase independent from the formations of the G.P.(Ⅱ) and the θ′-phase at the aging temperatures. High resolution transmission electron microscopy (HRTEM) revealed that the G.P.(Ⅰ) is formed at a very early stage of isothermal aging at 463K. Comparing the Vickers microhardness and TEM images, it was concluded that G.P.(Ⅱ) is mainly responsible for the peak hardness.

  Info
Periodical
Materials Science Forum (Volumes 475-479)
Main Theme
Edited by
Z.Y. Zhong, H. Saka, T.H. Kim, E.A. Holm, Y.F. Han and X.S. Xie
Pages
353-356
DOI
10.4028/www.scientific.net/MSF.475-479.353
Citation
S. K. Son, M. Takeda, T. Endo, "Microstructures and Thermal Stability of the Metastable-Phase Precipitates Formed in an Al-Cu Alloy", Materials Science Forum, Vols. 475-479, pp. 353-356, 2005
Online since
January 2005
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$32.00
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