Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 623, Issue -, Pages 317-323Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2014.09.179
Keywords
Magnesium alloy; Tri-axial forging; Dynamic precipitation; Transmission Electron Microscopy; Scanning Electron Microscopy
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Funding
- Boeing Company, USA
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The precipitation behavior of the magnesium alloy WE43 (Mg-4%Y-2.3%Nd-0.5%Zr) has been studied in strained and unstrained conditions using Transmission Electron Microscopy (TEM). Ageing treatments were carried out at three temperatures, namely 210 degrees C, 230 degrees C and 260 degrees C. The precipitation sequence during static aging of solution treated (ST) samples has been identified as ST --> beta --> beta' followed by the formation of beta(1) and equilibrium beta precipitates form after very long ageing periods. Dynamic precipitation was observed during high temperature deformation, leading to the formation of beta' and intermediate beta(1) precipitates. The strained samples, when further heat treated, resulted in the transformation of beta(1) into beta equilibrium precipitates. The sequence of dynamic precipitation is ST --> beta(1) --> beta and ST --> beta'. (C) 2014 Elsevier B.V. All rights reserved.
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