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Influence of dispersoids on microstructure evolution and work hardening of aluminium alloys during tension and cold rolling

Influence of dispersoids on microstructure evolution and work hardening of aluminium alloys during tension and cold rolling

Kategori
Vitenskapelig artikkel
Sammendrag
The influence of dispersoids on work hardening of aluminium during tension and cold rolling has been studied by comparing Al–Mn alloys containing similar amounts of solutes but various dispersoid densities. The microstructure evolution with deformation strain was examined in transmission and scanning electron microscopy. It is found that a high density of fine dispersoids strengthens the materials significantly, but their strengthening effect diminishes as the strain increases. From a series of Bauschinger tests, it is found that the internal stress, due to particles, increases rapidly at the initial stage of deformation, but saturates at strains larger than 5%. It is concluded that the internal stress makes a small contribution to the work hardening and contributes to less than 10% of the total flow stress during monotonic loading at strains larger than 5%. The work-hardening behaviour has been correlated to the corresponding microstructure, and the strengthening mechanisms are discussed.
Oppdragsgiver
  • Research Council of Norway (RCN) / 193179
Språk
Engelsk
Forfatter(e)
  • Qinglong Zhao
  • Bjørn Holmedal
  • Yanjun Li
Institusjon(er)
  • Norges teknisk-naturvitenskapelige universitet
  • SINTEF Industri / Metallproduksjon og prosessering
År
Publisert i
Philosophical Magazine
ISSN
1478-6435
Årgang
93
Hefte nr.
22
Side(r)
2995 - 3011