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Precipitation of the β-phase in Al–Mg alloys

  • Hirosuke Inagaki EMAIL logo
Published/Copyright: December 9, 2021
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 96 Issue 1

Abstract

In order to clarify the effects of the ageing temperature and the Mg content on precipitation of the β′- and β-phases in Al –Mg alloys, Al-6, 7, 8 and 9 wt.% Mg alloys were solution treated either at 450 °C and isothermally aged at temperatures between 150 and 325 °C. Precipitation of these phases was investigated in detail by optical microscopy and by the measurements of electrical conductivity and micro- Vickers hardness. It was found that, in these alloys, nucleation of precipitates occurred much more rapidly at grain boundaries than within the grains at all ageing temperatures. It was always after grain boundary precipitation had completed that precipitation within the grains began to take place. Time Temperature Transformation curves were therefore constructed both for grain boundary precipitation and for precipitation within the grains. These TTT curves showed that, in all cases, both types of precipitation occurred most rapidly at ageing temperatures between 250 and 275 °C. At ageing temperatures above these nose temperatures, precipitation occurred mainly by rapid growth of a limited number of precipitates, whereas at ageing temperatures below these nose temperatures, precipitation took place by the nucleation of numerous fine precipitates and by their subsequent slow growth. The increase in the Mg content not only accelerated precipitation, but also it increased the amount of precipitation within the grains.

Keywords: Al –Mg alloys; Precipitation; Grain Boundary
Prof. Dr. H. Inagaki Shonan Institute of Technology 251-8511 Fujisawashi Tsujidou-nishikaigan 1-1-25, Japan Tel.: +81 466300154 Fax: +81 466349527

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Received: 2004-01-13
Accepted: 2004-09-05
Published Online: 2021-12-09

© 2005 Carl Hanser Verlag, München

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  17. Thermodynamic investigations of Bi–Cd, In–Pb, and Ni–Pd liquid alloys
  18. Instructions for authors
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  23. Conferences /Konferenzen
https://doi.org/10.3139/ijmr-2005-0007
Keywords for this article
Al –Mg alloys; Precipitation; Grain Boundary

Articles in the same Issue

  1. Frontmatter
  2. Editorial
  3. Editorial
  4. Articles BBasic
  5. Interdiffusion, Kirkendall effect, and Al self-diffusion in iron–aluminium alloys
  6. Permanent magnet alloys based on Sm2Co17; phase evolution in the quinary system Sm–Zr–Fe–Co–Cu
  7. A unified equation for the viscosity of pure liquid metals
  8. Calorimetric Study of Mg2Zn3
  9. Calorimetric investigations of the two ternary systems Al–Sn–Zn and Ag–Sn–Zn
  10. Articles AApplied
  11. Precipitation of the β-phase in Al–Mg alloys
  12. Mechanical properties of saffil fiber reinforced Zinc–Aluminium alloy (ZA 27) produced by pressure die casting
  13. Deformation and fracture mechanisms of Al2O3/Nb/Al2O3 composites under compression
  14. Kinetics and dynamics of hot deformation of OFHC copper in extended temperature and strain rate ranges
  15. Mechanism and kinetics of aging of high-strength Cu-5 wt.% Ni-2.5 wt.% Ti
  16. Microstructural evolution of Al–Ni–Y powders with different sizes
  17. Thermodynamic investigations of Bi–Cd, In–Pb, and Ni–Pd liquid alloys
  18. Instructions for authors
  19. Notifications/Mitteilungen
  20. Richtlinien für autoren
  21. Personal/ Personelles
  22. Press / Presse
  23. Conferences /Konferenzen
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