Title

On The Plate-Like Τ-Phase Formation In Mnal-C Alloys

Keywords

Displacive; Domain boundary; Polytype; Stress-induced transformation

Abstract

A detailed description of the displacive transformation mode of the formation of plate-like τ-phase in MnAl (containing a small amount of carbon) is given. The plate-like τ-phase forms in a stepwise mode from the ε-phase. Crystallographic correspondence is transmitted from the ε- to the τ-phase during the whole transformation sequence. The intermediate long-range ordered ε′-phase nucleates within the ε-matrix. As ε′-domains evolve, elastic strains increase at the ε′-interfaces until shear occurs in ε′-domains to reduce the transformation strains. Stacking faults appear between ε′-domain boundaries. Polytypes are the result of a shuffling of the stacking faults within ε′-domains. Finally, the ε′-domain boundaries are overcome by the collective motion of transformation dislocations which form twinned τ-plates. The ε′-domain boundaries are nucleation sites for successive transformation steps and limit the spatial extension of the transformation for the intermediate steps.

Publication Date

1-1-2004

Publication Title

Zeitschrift fuer Metallkunde/Materials Research and Advanced Techniques

Volume

95

Issue

6

Number of Pages

486-491

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.3139/146.017981

Socpus ID

3042552151 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/3042552151

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