Journal article
Some Considerations of the Occurrence of Dendrite Fragmentation Due to the Melting of High Energy Grain Boundaries
Transactions of the Japan Institute of Metals, Vol.27, pp.1037-1044
25 Nov 1985
Abstract
The mechanism of dendrite fragmentation, when partially solidified metallic dendrites were stirred, was discussed in terms of the formation and subsequent melting of high energy grain boundaries. Different types of grain boundaries were observed: (i) low angle grain boundaries; (ii) near twin boundaries ( Sigma = 3), that is, boundaries which are made up of twin orientation together with the additional low angle misorientation; and (iii) some high coincidence site boundaries--many of which are known from Gleiter's work to have low energy. These observations, including the microstructural observations of grain boundaries within solid dendrites, and some bent dendrite arms, were the evidence for the mechanical fragmentation mechanism by plastic deformation and recrystallization. Further evidence for this mechanism was provided by the production of grain boundaries in an Al single crystal bent at high temperature. 18 ref.--AA(UK/US).
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Details
- Title
- Some Considerations of the Occurrence of Dendrite Fragmentation Due to the Melting of High Energy Grain Boundaries
- Creators
- H LeeR DohertyE Feest
- Publication Details
- Transactions of the Japan Institute of Metals, Vol.27, pp.1037-1044
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- [Retired Faculty]; Materials Science and Engineering
- Identifiers
- 991021889911504721