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Title: Microstructural studies on phase evolution sequence in rapidly solidified Zr3Al based binary and ternary alloys
Authors: TEWARI, R
Keywords: Ageing
Amorphous State
Crystal Microstructure
Phase Separation
Issue Date: 2001
Publisher: Elsevier
Citation: Materials Science and Engineering: A 304-306(1-2), 548-554
Abstract: Transformation sequences in the alloys Zr3Al, Zr3Al–3Nb and Zr3Al–10Nb are described and rationalized in terms of some basic tendencies such as phase separation and chemical ordering in the β phase and displacive omega and β→α (h.c.p.) transformations. These alloys were melt-spun and aged at different temperatures to study the evolution of different phases. The rapidly solidified Zr3Al alloy showed the presence of an amorphous phase or of a spinodally decomposed microstructure depending upon the severity of quenching, whereas the microstructure of the Zr3Al–3Nb and the Zr3Al–10Nb alloys exhibited a distribution of cuboidal particles (D88 phase) in the β matrix. Ageing of these alloys showed the formation of several metastable phases prior to the formation of equilibrium phase. The transformation sequence was found to involve a gradual filling of the open structure into a close packed configuration without reconstruction of the lattice.
ISSN: 0921-5093
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