Title

Intermetallic Phase Formation And Growth In The Mg-Y System

Keywords

Magnesium; Yttrium

Abstract

Rare earths have been added to magnesium alloys in order to improve the creep resistance, corrosion resistance and strength. Solid-to-solid diffusion couples were assembled between Mg (99.9%) and Y (99.9%) to investigate the formation and growth of intermetallic phases and interdiffusion in the Mg-Y system. The diffusion anneals were performed at 450, 500 and 550°C for 360, 240 and 120 hours, respectively. The intermetallic layers that developed were the δ-Mg2Y and ε-Mg24Y5 phases, however the MgY phase did not form. A substantial penetration of Y in Mg was observed, however along with Kirkendall porosity that indicates faster diffusion of Mg than Y in Mg solid solution. The activation energies for parabolic growth in ε-Mg24Y5 and δ-Mg2Y were calculated to be 84 kJ/mol and 77 kJ/mol, respectively.

Publication Date

1-1-2012

Publication Title

Magnesium Technology

Number of Pages

145-148

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.1007/978-3-319-48203-3_27

Socpus ID

84860806412 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84860806412

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