Coarsening and solutioning of precipitates in superalloys

Coarsening and solutioning of the main strengthening phase for the majority of superalloys, the y' phase, are discussed. It is shown that a general prediction of coarsening rates and solutioning temperatures is possible.

The Jominy end-quench test for investigation of corrosion properties and microstructure of high strength aluminium alloys

The Jominy end-quench test was applied to extruded rods of the aluminium alloys 2024 and 7075 to obtain a decreasing quench rate over the length of the rods. Subsequently the alloys were heat treated to the conditions: 2024-T4, 2024-T6, 7075-T73. A corrosion investigation and a transmission electron microscopy investigation were performed to...

Comparison of fracture toughness in titanium alloys IMI 550 and IMI 551

Fracture toughness tests on two high strength titanium alloys, IMI 550 and 551, showed that the higher strength alloy, IMI 551, had a much lower toughness. The alloys were very similar in microstructure and fracture mechanisms. A number of model formulations for predicting fracture toughness were compared with the experimental results. This...

A mathematical theory of plasticity for strainhardening materials exhibiting initial anisotropy

In this report a model is presented for anisotropic hardening in continued plastic deformation of materials exhibiting anisotropy due to initial permanent strains. - Isotropic material behaviour is assumed for all elastic deformations. However, the permanent strains give rise to anisotropy with respect to subseqfuent yielding. - The plastic...