Effect of severe plastic deformation on the precipitation, residual stressed and mechanical properties of red gold alloys

12 months - paid

Neuchatel, Suisse

Personnes à contacter par le candidat

Dr Cyril Cayron, Tél: + 41 76 560 50 52, cyril.cayron@epfl.ch -
Pr Roland Logé, Tél: + 41 21 695 42 69, roland.loge@epfl.ch

DATE DE DÉBUT SOUHAITÉ

11/01/2023

DATE LIMITE DE CANDIDATURE

11/01/2023

TÉLÉCHARGEZ L’OFFRE

Coloured Au-Cu-X gold alloys are widely used in the jewellery and watch industry. They undergo a phase transformation from the high temperature disordered phase A1 to the low-temperature ordered phase L10. The transformation is diffusive but it also exhibits a strong displacive character as shown by variant selection under stress, shape memory effect, and other odd behaviors. Traditional manufacturing methods often turn out to be problematic when processing red gold alloys because the transformation can cause large macroscopic shape distortions difficult to predict.

The project aims at determining the influence of severe plastic deformation on the precipitation, residual stresses and mechanical properties of the 18 carat red gold alloys.