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Evolution of constitution, structure, and mechanical properties in Fe–Ti–Zr–B heterogeneous multiphase composites

Published online by Cambridge University Press:  01 January 2011

Jin Man Park ,
Do Hyang Kim ,
Ki Buem Kim ,
Norbert Mattern  and
Jürgen Eckert
Jin Man Park
Affiliation:
Leibniz Institute for Solid State and Materials Research Dresden, Institute for Complex Materials, D-01171 Dresden, Germany; and Center for Non-Crystalline Materials, Department of Metallurgical Engineering, Yonsei University, Seoul 120-749, Republic of Korea
Do Hyang Kim*
Affiliation:
Center for Non-Crystalline Materials, Department of Metallurgical Engineering, Yonsei University, Seoul 120-749, Republic of Korea
Ki Buem Kim
Affiliation:
Department of Advanced Materials Engineering, Sejong University, Seoul 143-747, Republic of Korea
Norbert Mattern
Affiliation:
Leibniz Institute for Solid State and Materials Research Dresden, Institute for Complex Materials, D-01171 Dresden, Germany
Jürgen Eckert
Affiliation:
Leibniz Institute for Solid State and Materials Research Dresden, Institute for Complex Materials, D-01171 Dresden, Germany; and TU Dresden, Institute of Materials Science, D-01062 Dresden, Germany
*
a)Address all correspondence to this author. e-mail: dohkim@yonsei.ac.kr
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Abstract

The constituent phases, the microstructure, and the mechanical properties of a series of Fe87–xTi7Zr6Bx (x = 0, 2, 4, 6, 8, 10, and 12) alloys produced by copper mold casting were investigated. Partial substitution of iron by boron in the Fe87Ti7Zr6 ultrafine eutectic alloy induces phase/microstructural evolution and simultaneously changes the mechanical properties. In the composition range of 2 ≤ x ≤ 6, the typical lamellar structure slightly changes into a spherical cellular-type eutectic. For 8 ≤ x ≤ 12, multiphase composites containing a glassy phase form. The ultrafine eutectic composites exhibit a high compressive strength of ~2.9–3.1 GPa and a distinct plasticity of ~2–8%, whereas the glassy matrix composites show a high strength of ~3.1–3.3 GPa but no observable macroscopic plasticity before failure. These findings reveal that the plasticity of heterogeneous multiphase composites is strongly related to the length scale variables and the crystallinity of the constituent phases.

Type
Articles
Information
Journal of Materials Research , Volume 26 , Issue 3 , 14 February 2011 , pp. 365 - 371
Copyright
Copyright © Materials Research Society 2011

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