Journal article
Loss of solute at the fracture surface in fatigued aluminium precipitation-hardened alloys
Materials science and engineering, v 32(3), pp 255-265
01 Jan 1978
Abstract
The pseudo-cleavage, slip plane facets found in fatigued, precipitation-hardened aluminium alloys have been chemically analysed by glancing angle electron probe microanalysis, EPMA. The results at low angles of electron beam incidence and low beam voltages indicate that the fracture surfaces are depleted in solute — copper in Al−4%Cu and zinc in Al−3%Zn−1.5%Mg alloys. The technique of glancing angle EPMA could readily detect the presence of 25 nm of aluminium evaporated onto homogeneous Al−4%Cu; the magnitude of the effect on fatigue fracture surfaces suggests that the size of the solute-depleted zone is similar to the reported widths of persistent slip bands, PSB, in alloys containing metastable precipitates. The observation of solute depletion in PSB is compatible with three of the mechanisms suggested for the poor fatigue strengths of precipitation hardened alloys — reversion, disordering, and Ostwald ripening. Solute depletion in the PSB should cause the fatigue-induced PSB to become even weaker by virtue of the loss of solid solution strengthening as well as by the loss of precipitate strengthening.
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Details
- Title
- Loss of solute at the fracture surface in fatigued aluminium precipitation-hardened alloys
- Creators
- S. Brett - University of SussexR.D. Doherty - University of Sussex
- Publication Details
- Materials science and engineering, v 32(3), pp 255-265
- Publisher
- Elsevier
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- [Retired Faculty]; Materials Science and Engineering
- Web of Science ID
- WOS:A1978ES10800006
- Scopus ID
- 2-s2.0-0342799862
- Other Identifier
- 991021889907804721