Enhanced precipitate growth at reduced temperatures during chemical ordering in deformed red gold alloys

SCRIPTA MATERIALIA

卷:170

Article

Garcia-Gonzalez, Marina^1,2  Van Petegem, Steven¹  Baluc, Nadine³  Hocine, Samy^1,2  Dupraz, Maxime^1,2  Lalire, Fanny⁴  Van Swygenhoven, Helena^1,2 

[1] Paul Scherrer Inst, Photons Engn & Mfg, CH-5232 Villigen, Switzerland

[2] Ecole Polytech Fed Lausanne, Neutrons & Xrays Mech Mat, CH-1015 Lausanne, Switzerland

[3] Ecole Polytech Fed Lausanne, Ctr Interdiscipinaire Microscopie Elect, CH-1015 Lausanne, Switzerland

[4] Richemont Int SA, CGHH, CH-1217 Meyrin, Switzerland

关键词: X-ray diffraction;    Gold alloys;    Ordering;    Plastic deformation;    Ageing;   

DOI  :  10.1016/j.scriptamat.2019.05.038

来源: Elsevier

【 摘 要 】

Manufacturing of red gold components relies widely on controlling the formation of ordered precipitates during thermo-mechanical processing. The ordered phase hardens the material, makes it less workable and introduces residual stresses. We show that an industrial wire straightening process on chemically disordered wires enhances the formation of ordered precipitates in the near surface region during natural ageing. To address the role of plastic deformation during artificial ageing, in situ X-ray experiments are carried out on deformed and undeformed samples. It is shown that pre-deformation decreases the onset temperature for ordering and enhances precipitation growth at the early stages of the transformation. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

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