Local atomic structure investigation of AlFeCuCrMgx (0.5, 1, 1.7) high entropy alloys: X-ray absorption spectroscopy study. (February 2017)

• Record Type: Journal Article
• Authors: Maulik, Ornov; Patra, N.; Bhattacharyya, D.; Jha, S.N.; Kumar, Vinod
• Is Part Of: Solid state communications. Volume 252(2017)
• Page Start: 73
• Page End: 77
• Publication Date: 2017-02
• Subjects: High entropy alloy -- Mechanical alloying -- X-Ray absorption spectroscopy -- Immiscible alloys; Solid state chemistry -- Periodicals; Solid state physics -- Periodicals; Chimie de l'état solide -- Périodiques; Physique de l'état solide -- Périodiques; 530.41
• DOI: 10.1016/j.ssc.2017.01.018
• Languages: English
• ISSNs: 0038-1098

Abstract

Abstract: The present paper reports local atomic structure investigation of novel AlFeCuCrMgx (x=0.5, 1, 1.7) high entropy alloys (HEAs) produced by mechanical alloying using Fe, Cr and Cu K-edge X-ray absorption near edge spectroscopy (XANES) and extended x-ray absorption fine structure (EXAFS) spectroscopy. XANES spectra measured at Fe and Cr K-edges resemble that of the respective pure metal foils, while the spectrum measured at Cu K-edge manifests the presence of some other phases in the as-milled alloys. The radial distribution functions (RDFs) obtained from Fourier transformation of EXAFS spectra support the formation of disordered BCC structure. Highlights: Local atomic order of novel multi-component AlFeCuCrMgx (x=0.5, 1, 1.7) high entropy alloys has been studied by XANES & EXAFS. Bond length distribution determined from Fe and Cr K-edge EXAFS measurements is in favor of the formation of majorly BCC phase. Cu K-edge data shows formation of some copper oxide phases in the alloy.