Grain boundary misorientation dependence of beta phase precipitation in an Al-Mg alloy

作者：D' Antuono D Scotto; Gaies J; Golumbfskie W; Taheri M L^*

来源：Scripta Materialia, 2014, 76: 81-84.

DOI：10.1016/j.scriptamat.2014.01.003

• Sensitization
• In situ TEM
• Misorientation
• Aluminum alloy
• beta Phase

Precipitation of beta phase (A13Mg2) in an Al-Mg alloy is investigated by in situ heating and precession diffraction-based orientation imaging in a transmission electron microscope. Initial beta formation occurs more readily at low-angle grain boundaries than at high-angle boundaries; however, larger precipitates are found at high-angle boundaries. We propose a mechanism for beta formation based on boundary energy and grain boundary free volume. These results advance the understanding of beta phase formation, aiding future corrosion prevention.

• 出版日期2014-4