Title

An Unusual Phase Transformation During Mechanical Alloying Of An Fe-Based Bulk Metallic Glass Composition

Keywords

Bulk metallic glass; Fe-based alloy; Mechanical alloying; Phase transformation; X-ray diffraction

Abstract

Mechanical alloying of an Fe-based bulk metallic glass composition (Fe 60Co8Zr10Mo5W2B 15) was conducted starting from blended elemental powders. A supersaturated solid solution of all the alloying elements in Fe has formed in the initial stages of milling. This α-Fe phase became amorphous on subsequent milling up to 20-30 h. Further milling, unexpectedly, led to primary crystallization of the amorphous phase resulting in the formation of an (α-Fe)′ phase with a slightly smaller lattice parameter (and lower solute content) than that in the early stages of milling. External annealing of the amorphous phase powder at 700 °C for 1 h led to complete crystallization of the amorphous phase into a mixture of phases including α-Fe, ZrFe 2, Fe2B, Fe3B, MoB2, FeMo 2B2, and at least another unidentified phase. Possible reasons for such an unusual amorphous → crystalline transformation on milling in the bulk metallic glass composition are discussed and it was shown that this transformation is due to the combination of defect-assisted diffusion and a slight rise in the powder temperature. © 2004 Elsevier B.V. All rights reserved.

Publication Date

3-8-2005

Publication Title

Journal of Alloys and Compounds

Volume

389

Issue

1-2

Number of Pages

121-126

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1016/j.jallcom.2004.08.020

Socpus ID

13444280475 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/13444280475

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