Dynamic and static strain aging effects in Fe-modified L1[sub 2] Al[sub 3]Ti
- Univ. of Pennsylvania, Philadelphia, PA (United States). Dept. of Materials Science and Engineering
Serrations have been observed in the stress-strain curves of Fe-modified L1[sub 2] Al[sub 3] Ti-based alloys at intermediate temperatures and related to dynamic interactions between mobile dislocations and solute atoms, i.e. dynamic strain aging effects. Serrations appear only at intermediate, not at high or low temperatures, because of the following reasons: at high temperatures the diffusivity of the solute atoms is high enough that the solute atoms and dislocations move together, thereby requiring no break-away of the dislocations. At low temperatures the diffusivity of the solute atoms is so low that no dynamic interaction can occur, but a static interaction is observed, instead. Thus the entire range of yielding phenomena can be consistently explained in terms of interactions between solute atoms and mobile dislocations and requires no assumptions about changes in the nature of dislocation cores. The solutes giving rise to this effect are likely of substitutional type but have not been identified.
- OSTI ID:
- 7156826
- Journal Information:
- Acta Metallurgica et Materialia; (United States), Vol. 42:10; ISSN 0956-7151
- Country of Publication:
- United States
- Language:
- English
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