The influence of critical points and structure and microstructural evolution in iron rich Fe-Si alloys

Raviprasad, K. ; Chattopadhyay, K. (1993) The influence of critical points and structure and microstructural evolution in iron rich Fe-Si alloys Acta Metallurgica et Materialia, 41 (2). pp. 609-624. ISSN 0956-7151

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/095671...

Related URL: http://dx.doi.org/10.1016/0956-7151(93)90091-6

Abstract

The evolution of microstructure in Fe-8.7 to 14.2 at.% Si alloys in the neighbourhood of higher order transition lines has been investigated. Systematics of various features of the Fe-Si phase diagram, highlighting the multicritical points, have been presented. The possible influence of these critical points on the kinetic pathways for the microstructural evolution has been discussed and compared with experimental results. It is shown that below the metastable tricritical point the alloy undergoes continuous ordering and a conditional spinodal followed by the renucleation of B2 phase in the DO3 matrix. The latter process leads to the anomalous contrast in the B2 superlattice darkfield images. It is also shown that above the metastable (extrapolated) higher order B2 → DO3 transition line a small domain exists in the two phase field where decomposition to two phase B2 + DO3 takes place by classical nucleation of fine DO3 domains in B2 matrix. No evidence for DO3 ordering could be obtained in alloy containing less than 11 at.% Si.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
ID Code:6629
Deposited On:22 Oct 2010 06:27
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