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Microstructure and mechanical properties of Zr–Co–Al alloys prepared by rapid solidification

Published online by Cambridge University Press:  18 April 2017

Caiju Li ,
Wenfei Lu ,
Jun Tan ,
Jingmei Tao ,
Jianhong Yi ,
Qixuan Zhang  and
Yang Xi
Caiju Li*
Affiliation:
Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
Wenfei Lu
Affiliation:
Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
Jun Tan
Affiliation:
Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
Jingmei Tao
Affiliation:
Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
Jianhong Yi
Affiliation:
Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
Qixuan Zhang
Affiliation:
Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
Yang Xi
Affiliation:
Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
*
a) Address all correspondence to this author. e-mail: lcj@kmust.edu.cn
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Abstract

Zr–Co–Al alloys possess prospects of wide applications in the field of nuclear reactor cladding materials and biomedical materials. (Zr0.5Co0.5)100−x Al x (x = 1, 2, 3 at.%) alloys were prepared by the water-cooling copper mold suction casting technique, and the microstructure and compression mechanical properties of the alloys were investigated. The results showed that the as-cast Zr–Co–Al alloys mainly consisted of the B2 ZrCo phase with columnar or equiaxed grains and a small quantity of intermetallic compounds, i.e., Co2Zr and Zr2Co. The yield strength of Zr–Co–Al alloys increased with increasing Al content, but the plasticity decreased at the same time. The as-cast Zr49.5Co49.5Al1 alloy attained the highest ultimate compression strength up to 2.57 ± 0.02 GPa and the largest compression strain up to ∼54.7%. The B2 to B33 martensitic transformation that occurred during the deformation process was investigated using high resolution transmission electron microscopy. It was concluded that the enhanced plasticity of Zr49.5Co49.5Al1 alloy can be attributed to the transformation induced plasticity associated with the deformation-induced martensitic transformation.

Keywords

compoundtransmission electron microscopy (TEM)stress/strain relationship
Type
Articles
Information
Journal of Materials Research , Volume 32 , Issue 13 , 14 July 2017 , pp. 2570 - 2577
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Jörg F. Löffler

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