Thermal stability and hardness of Mg-Cu-Au-Y amorphous alloys

M. Baricco, A. Castellero, M. Di Chio, Z. Kovács, P. Rizzi, M. Satta, A. Ziggiotti

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

In this work the effect of Au addition to the GFA of the Mg65Cu25Y10 alloy will be discussed. Mg65Cu25Y10 and Mg65Cu15Au10Y10 amorphous alloys were obtained by rapid solidification. Copper mould casting gave a fully amorphous phase for Mg65Cu25Y10, whereas the equilibrium crystalline phases were observed for Mg65Cu15Au10Y10. A single eutectic melting reaction was observed for Mg65Cu25Y10 but for Mg65Cu15Au10Y10 melting is clearly off-eutectic. The presence of an off-eutectic melting of the alloy allows glass formation only by rapid solidification and reduces the glass forming ability. The addition of Au changes the crystallization mechanism of Mg65Cu25Y10 amorphous alloy from polymorphic to primary. Two well-separated crystallization peaks were observed for Mg65Cu25Y10, whereas for Mg65Cu15Au10Y10 the crystallization is more complicated and two overlapped crystallization signals were obtained, followed by a broad exothermal peak at higher temperature. Y-containing Mg2Cu nanocrystals are formed as first crystallization product for both alloys. The Au-containing sample produces also a nanocrystalline AuCu3 phase. From the indentation tests, a significant increase of hardness was observed in the Au-containing amorphous alloy during crystallization, because of the formation of nanocrystalline phases.

Original languageEnglish
Pages (from-to)183-186
Number of pages4
JournalJournal of Alloys and Compounds
Volume434-435
Issue numberSPEC. ISS.
DOIs
Publication statusPublished - May 31 2007

Fingerprint

Amorphous alloys
Crystallization
Thermodynamic stability
Hardness
Eutectics
Melting
Rapid solidification
Glass
Indentation
Nanocrystals
Copper
Casting
Crystalline materials

Keywords

  • Amorphization
  • Amorphous materials
  • Thermal analysis
  • X-ray diffraction

ASJC Scopus subject areas

  • Metals and Alloys

Cite this

Baricco, M., Castellero, A., Di Chio, M., Kovács, Z., Rizzi, P., Satta, M., & Ziggiotti, A. (2007). Thermal stability and hardness of Mg-Cu-Au-Y amorphous alloys. Journal of Alloys and Compounds, 434-435(SPEC. ISS.), 183-186. https://doi.org/10.1016/j.jallcom.2006.08.110

Thermal stability and hardness of Mg-Cu-Au-Y amorphous alloys. / Baricco, M.; Castellero, A.; Di Chio, M.; Kovács, Z.; Rizzi, P.; Satta, M.; Ziggiotti, A.

In: Journal of Alloys and Compounds, Vol. 434-435, No. SPEC. ISS., 31.05.2007, p. 183-186.

Research output: Contribution to journalArticle

Baricco, M, Castellero, A, Di Chio, M, Kovács, Z, Rizzi, P, Satta, M & Ziggiotti, A 2007, 'Thermal stability and hardness of Mg-Cu-Au-Y amorphous alloys', Journal of Alloys and Compounds, vol. 434-435, no. SPEC. ISS., pp. 183-186. https://doi.org/10.1016/j.jallcom.2006.08.110
Baricco M, Castellero A, Di Chio M, Kovács Z, Rizzi P, Satta M et al. Thermal stability and hardness of Mg-Cu-Au-Y amorphous alloys. Journal of Alloys and Compounds. 2007 May 31;434-435(SPEC. ISS.):183-186. https://doi.org/10.1016/j.jallcom.2006.08.110
Baricco, M. ; Castellero, A. ; Di Chio, M. ; Kovács, Z. ; Rizzi, P. ; Satta, M. ; Ziggiotti, A. / Thermal stability and hardness of Mg-Cu-Au-Y amorphous alloys. In: Journal of Alloys and Compounds. 2007 ; Vol. 434-435, No. SPEC. ISS. pp. 183-186.
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