Microstructure and Mechanical Properties of the Alloy Mg61Cu28Gd11 in Submicrovolumes

Abstract:

We studied the microstructure and nanomechanical properties of cast samples of the alloy Mg61Cu28Gd11, obtained by the original method. The alloy Mg61Cu28Cd11 is distinguished by a particularly high glass transition property. In this study samples with a diameter of 16 mm were obtained an inert atmosphere with a cooling rate of 1K/s. Liquid alloy Mg61Cu28Gd11 before crystallization was heated to 780 °C. It was previously installed that, with such heating, irreversible structural changes occur in the melt, which increase the tendency of the metal to glass transition. A metallographic study of the microstructure was performed using a scanning electron microscope and EDS-analysis. Nanohardness HV and Young's modulus E Mg₂CuCd and Mg₂Cu were measured using the nanoindentation method.The microstructure of the Mg61Cu28Cd11 alloy in the cast state consists mainly of Mg₂Cu dendrites; the interdendritic space is represented by the Mg₂CuCd phase. The presence of exogenous nonmetallic inclusions of a complex composition CdO + CuO + MgO was also established by the method of micro X-ray spectral analysis.Analysis of the measurement data of HV(GPa), E (GPa) gave a conclusion about the same degree of homogeneity of the mechanical properties of dendrites and interdendritic space.

• Periodical: Materials Science Forum (Volume 989)
• Pages: 177-181
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.989.177
• Online since: May 2020
• Authors: A.R. Barashev*, O.A. Chikova, G.A. Tkachuk
• Keywords: EDS-Analysis, Electron Scanning Microscopy, Microstructure, Nanoindentation, Nanomechanical Properties, Volume-Amorphous Alloys

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