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Title: Precipitation in Al–Mg solid solution prepared by solidification under high pressure

The precipitation in Al–Mg solid solution containing 21.6 at.% Mg prepared by solidification under 2 GPa was investigated. The results show that the γ-Al{sub 12}Mg{sub 17} phase is formed and the β′ phase cannot be observed in the solid solution during ageing process. The precipitation of γ and β phases takes place in a non-uniform manner during heating process, i.e. the γ and β phases are first formed in the interdendritic region, which is caused by the inhomogeneous distribution of Mg atoms in the solid solution solidified under high pressure. Peak splitting of X-ray diffraction patterns of Al(Mg) solid solution appears, and then disappears when the samples are aged at 423 K for different times, due to the non-uniform precipitation in Al–Mg solid solution. The direct transformation from the γ to β phase is observed after ageing at 423 K for 24 h. It is considered that the β phase is formed through a peritectoid reaction of α + γ → β which needs the diffusion of Mg atoms across the interface of α/γ phases. - Highlights: • The γ phase is formed and the β′ phase is be observed in Al(Mg) solid solution. • Peak splitting of XRD patternmore » of Al(Mg) solid solution appears during aged at 150 °C. • The β phase is formed through a peritectoid reaction of α + γ → β.« less
Authors:
 [1] ;  [2] ; ; ;  [3] ;  [1]
  1. Laboratory of Special Processing of Raw Materials and School of Material Science and Engineering, Dalian University of Technology, Dalian, 116024 (China)
  2. (China)
  3. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001 (China)
Publication Date:
OSTI Identifier:
22288719
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Characterization; Journal Volume: 87; Other Information: Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; MICROSTRUCTURE; PRECIPITATION; PRESSURE RANGE GIGA PA; PRESSURE RANGE MEGA PA 10-100; SOLID SOLUTIONS; SOLIDIFICATION; X-RAY DIFFRACTION