NDLI: Nanocrystalline microstructures in Fe$_{93 − x }$Zr$_{7}$B$

Content Provider	Springer Nature Link
Author	Xiong, X. Y. Finlayson, T. R. Muddle, B. C.
Copyright Year	2003
Abstract	The crystallization behaviour of amorphous Fe$_{93 − x }$Zr$_{7}$B$_{ x }$ (x = 3, 6, 12 at.%) alloys, the microstructures of the primary crystallization products of stable and metastable phases and the subsequent transformations, have been studied using a combination of differential scanning calorimetry, differential thermal analysis, X-ray diffraction and transmission electron microscopy, including microdiffraction. It has been found that, for x = 3 and 6 at.%, the sole product of primary crystallization is the bcc α-Fe phase and the average grain sizes of the crystalline phase were 14 nm and 12 nm for the two alloys, respectively. However, when x = 12 at.%, primary crystallization results in more than one crystalline phase, and a metastable phase with the cubic “Fe$_{12}$Si$_{2}$ZrB” structure is the major crystallization product after the primary crystallization reaction, accompanied by the α-Fe phase. The average grain size of this metastable phase was 35 nm for the alloy heated to 883 K at 20 K/min. Isothermal heat treatments at 873 K and 973 K confirm that after being heated for 240 h, this metastable phase transforms into equilibrium phases: bcc α-Fe, hcp ZrB$_{2}$ and probably hcp Fe$_{2}$Zr. The apparent activation energies for the primary crystallization reaction during continuous heating for these three alloys are 4.4 ± 0.2 eV, 3.5 ± 0.2 eV and 6.9 ± 0.3 eV, respectively.
Starting Page	1161
Ending Page	1169
Page Count	9
File Format	PDF
ISSN	00222461
Journal	Journal of Materials Science
Volume Number	38
Issue Number	6
e-ISSN	15734803
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2003-01-01
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Polymer Sciences Industrial Chemistry/Chemical Engineering Characterization and Evaluation Materials Mechanics
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Mechanics of Materials Mechanical Engineering Polymers and Plastics

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