Formation and stability of saturated bundled structure (SBS) in Ti{sub 3}Al single crystals cyclically deformed by double prism slip
- Osaka Univ., Suita, Osaka (Japan). Dept. of Materials Science and Engineering
Formation and stability of deformation substructure in fatigued Ti{sub 3}Al single crystals deformed by double prism slip were examined under different applied strain amplitude ({Delta}{var_epsilon}). The specimens were initially fatigued at {Delta}{var_epsilon} = {+-}0.2% or {+-}0.4% for 1 {times} 10{sup 4} cycles and subsequently cyclically deformed after the change in {Delta}{var_epsilon} from {+-}0.2% to {+-}0.3% or from {+-}0.3% to {+-}0.2%. The saturated bundled structure (SBS) was composed of the bundles with high density of edge dislocations aligning along [0001] and screw dislocations between the bundles were formed in specimens fatigued at initial {Delta}{var_epsilon} to the saturated stage. The bundles in the SBS were developed and expanded after the increase in {Delta}{var_epsilon} to {+-}0.3%, while the rearrangement of screw dislocations occurred and some parts of the saturated edge bundles were removed after the decrease in {Delta}{var_epsilon} to {+-}0.2%. The thermal stability of the fatigued substructure was examined in order to understand the formation process of edge dipoles and debris in the SBS. The change in the maximum shear stress amplitude and the Bauschinger effect were also examined during cyclic deformation.
- OSTI ID:
- 651104
- Journal Information:
- Acta Materialia, Journal Name: Acta Materialia Journal Issue: 13 Vol. 46; ISSN 1359-6454; ISSN ACMAFD
- Country of Publication:
- United States
- Language:
- English
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