Characterization of Grain Boundary Properties in Superplastic Al Based Alloys Using EBSD

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Original languageEnglish
Pages (from-to)381-386
Journal / PublicationMaterials Science Forum
Online published15 Jan 2001
Publication statusPublished - 2001
Externally publishedYes


TitleSuperplasticity in Advanced Materials (ICSAM-2000)
PlaceUnited States
CityOrlando, FL
Period1 - 4 August 2000


The grain boundary characteristics in the 1050, 5052, 5083, 6061 and 1420 LTSP Al alloys were examined using EBSD as a function of TMT and LTSP deformation true strain from 1.5-12.0. The grain boundary character was observed to evolve continuously during TMT and LTSP deformation. With increasing accumulated deformation strain, the bimodal grain boundary misorientation distribution gradually transformed into semi-random behavior. For different alloys under cold or warm working, the minimum working strain to achieve a semi-random grain boundary misorientation distribution favorable for GBS and LTSP varied accordingly. Only minor variation was observed for the CSL boundary fraction during TMT and LTSP deformation. Still over 80% of the MAB+HAB belonged to random higher angle boundaries that could proceed GBS. No apparent relationship was seen for the CSL population and LTSP performance.

Research Area(s)

  • Al Alloy, CSL Boundaries, EBSD, Grain Boundary, Low Temperature Superplasticity, Misorientation Angle