Strengthening of aluminium-lithium alloys by long-range ordered {delta}{prime}-precipitates

Journal Article · Wed Nov 01 04:00:00 EST 1995 · Acta Metallurgica et Materialia

DOI:https://doi.org/10.1016/0956-7151(95)00089-E· OSTI ID:131493

Schlesier, C; Nembach, E ^[1]

---

1. Univ. Muenster (Germany). Institut fuer Metallforschung

Strengthening of aluminium-rich aluminium-lithium single crystals by spherical, coherent particles of the L1{sub 2}-long-range ordered {delta}{prime}-phase has been investigated experimentally and theoretically. The total critical resolved shear stress {tau}{sub t} has been measured as a function of the radius r and the volume fraction f of the {delta}{prime}-particles. r and f covered the ranges 0.0--17.6 nm and 0.0--0.11, respectively. The {delta}{prime}-particles` contribution {tau}{sub p} and {tau}{sub t} is analyzed with reference to a model, which had originally been developed for the description of the strengthening effect of L1{sub 2}-long-range ordered {gamma}{prime}-particles in nickel-base superalloys. The experimental data {tau}{sub p}(r,f) of the present aluminium-lithium single crystals are well represented by this model. The specific antiphase boundary energy of the {delta}{prime}-particles has been found to be 0.070{+-}0.020 J/m{sup 2}. This value refers to {l_brace}111{r_brace}-planes.

• OSTI ID: 131493
• Journal Information: Acta Metallurgica et Materialia, Journal Name: Acta Metallurgica et Materialia Journal Issue: 11 Vol. 43; ISSN 0956-7151; ISSN AMATEB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
BURGERS VECTOR
CRYSTALLOGRAPHY
DISLOCATIONS
LITHIUM ALLOYS
MATHEMATICAL MODELS
MICROSTRUCTURE
MONOCRYSTALS
PARTICLE SIZE
PRECIPITATION
SHEAR PROPERTIES
SPHERES
STRESSES