[Kovove materialy - Metallic materials]
    Thu - March 28, 2024 - 21:41 No. of hits : 1736491 ISSN 1338-4252 (online) ISSN 0023-432X (printed)
© Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, Bratislava, Slovak Republic

VOLUME 44 (2006), Issue 3

The microstructure characteristics of the arc-melted Gd5Si2Ge2 alloy
FANG LEI, HONG MA
vol. 44 (2006), no. 3, pp. 161 - 167

Abstract
The Gd5(SixGe1-x)4 series alloys are promising candidates for the magnetic refrigeration. The effect of solidification rate on the phase composition and microstructure of the arc-melted Gd5Si2Ge2 alloy was investigated in this paper. Three samples with different weight of 10 g, 40 g and 65 g but the same stoichiometric Gd5Si2Ge2 composition were prepared by arc-melting using commercial Gd (99.9 wt.%). The X-ray diffraction (XRD) analysis showed that the medium weight sample (cca. 40 g) consists of single Gd5Si2Ge2 phase, while the other two samples consist at least of two phases, i.e, Gd5Si4 and Gd5Si2Ge2 phases within our XRD resolution. The cell growth and regular lines within the cell grains are the two main features observed by Scanning-Electron Microscope (SEM) and Optical Microscope (OM) in the as-cast samples. The line features in the medium weight sample were much less developed than those in the other samples. These lines were not confirmed to be the Widmanstätten structure of Gd5 (Si, Ge) 3 rods. The melt-spun Gd5Si2Ge2 alloy at different wheel speeds confirmed the influence of solidification rates on the phase composition. PACS: 75.50.Cc; 81.30.Fb

Key words
magnetic refrigerating materials, microstructure, Gd5Si2Ge2 lloymagneticphase transformation

[open article.pdf] Full text (691 KB)

[IMMS SAS]      UMMS SAV - Bratislava (SK) Personal data Protection   ver. 1.8.0      [go to HOME PAGE]
Full title of this journal is bilingual: Kovové materiály - Metallic Materials.
The official abbreviation in accordance with JCR ISI is Kovove Mater.


Article abstracts updated: 2023-10-26 07:45      
Articles in press revised: 2024-03-26 11:42     
Full text pdf uploaded: 2023-11-08 06:53    
Information updated: 2023-04-19 16:14   
Code last revised: 2024-03-06 11:13  

© OldSoft, 2004, …, 2024