The critical resolved shear stress of peak-aged aluminium-lithium single crystals
Journal Article
·
· Acta Materialia
- Univ. Muenster (Germany). Institut fuer Metallforschung
The critical resolved shear stress (CRSS) of single crystals of aluminum-rich aluminum-lithium alloys has been measured at 283 K. These alloys are strengthened by coherent precipitates of the metastable L1{sub 2} long-range-ordered {delta}{prime} phase. The specimens had been subjected to long aging treatments such that they were in the peak-aged state. This contrasts with the earlier investigation (Schleiser and Nembach, Acta metall mater, 1995, 43, 3983) in which underaged Al-Li single crystals have been studied. The contribution {tau}{sub p} of the {delta}{prime} precipitates to the present peak-aged specimens` total CRSS has been found to be a function only of the {delta}{prime} volume fraction f, i.e. {tau}{sub p} was independent of the radius of the {delta}{prime} precipitates. The experimental data {tau}{sub p}(f) are well represented by a relation which had been developed for the description of peak-aged {gamma}{prime}-strengthened nickel-base superalloys. These latter materials are isomorphous to {delta}{prime}-strengthened Al-rich Al-Li alloys: coherent L1{sub 2} long-range-ordered particles are embedded in a disordered f.c.c. matrix.
- OSTI ID:
- 353482
- Journal Information:
- Acta Materialia, Journal Name: Acta Materialia Journal Issue: 6 Vol. 47; ISSN 1359-6454; ISSN ACMAFD
- Country of Publication:
- United States
- Language:
- English
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