MS13-P11 In-situ temperature X-Ray diffraction and Mechanical study of the binary yellow 18-carat gold alloy AuCu Mohammed Said M. Abdelbaky (Department of Physical and Analytical Chemistry, University of Oviedo-CINN, Oviedo, Spain) Imene Lamiri (Research Unit of Material Science and Applications, Science Faculty, University Constantine 1, Constantine, 2500- Algeria , Constantine, Algeria) David Martínez Blanco (Scientific and Technical Services, University of Oviedo-CINN, Oviedo, Spain) Djamel Hamana (Research Unit of Material Science and Applications, Science Faculty, University Constantine 1, Constantine, Algeria) Santiago García Granda (Department of Physical and Analytical Chemistry, University of Oviedo-CINN, Oviedo, Spain)email: saidmohammed.uo@uniovi.esRegarding to the huge impact that have the phase transition sequences and temperatures on the physical properties of the alloys, the study of these phenomena has a practical importance[1-3].Herein, In-situ temperature XRD and mechanical spectroscopy were applied to study phase transitions in AuCu alloy. The measurements have been carried out from room temperature up to 973K from the ordered state AuCuI as starting phase. The phase transition sequences, was investigated upon heating using heating rate of 1K/min. The sequences of phase transitions presentimportant results that depend crucially to the starting state. This transition sequences determine temperature dependency of elastic and anelastic properties. The mechanical spectroscopy using forced torsion pendulum shows twin boundaries peak as typical peak of the orthorhombic phase AuCuII according to the thermal tests. The isothermal frequencies measurements have shown the behaviors of the thermally activated peaks in the phase transitions intervals.

Aknowedgment: Financial support from the Algerian Ministry of Higher Education and Scientific Research (PNE scholarship),Spanish Ministerio de Economía y Competitividad(MAT2016-78155-C2-1-R and FPI grant BES-2011-046948 to MSM.A.) and Gobierno del PrincipadodeAsturias (GRUPIN14-060)are acknowledged.
References:

[1] A. K. Maier, I. Tkalcec, D. Mari, R. Schaller, Mater. Sci. Eng., A. 560 (2013) 466-472.

[2] A. K. Maier, I. Tkalcec, D. Mari, R. Schaller, Solid State Phenomena. 184 (2012) 283-288.

[3] A. K. Maier, I. Tkalcec, D. Mari, R. Schaller, Acta Mater. 74 (2014) 132-140.
Keywords: Gold alloys, in-situ temperature XRD, mechanical spectroscopy