Effects of Ti, Zr, and Hf on the phase stability of Mo_ss + Mo3Si + Mo5SiB2 alloys at 1600 °C

Ying Yang; H. Bei; Shuanglin Chen; E. P. George; Jaimie Tiley; Y. Austin Chang

doi:10.1016/j.actamat.2009.09.032

Effects of Ti, Zr, and Hf on the phase stability of Mo_ss + Mo₃Si + Mo₅SiB₂ alloys at 1600 °C

Ying Yang, H. Bei, Shuanglin Chen, E. P. George, Jaimie Tiley, Y. Austin Chang

Research output: Contribution to journal › Article › peer-review

50 Scopus citations

Abstract

Understanding the stability of the three-phase Mo_ss + Mo₃Si + Mo₅SiB₂ region is important for alloy design of Mo-Si-B-based refractory metal intermetallic composites. In this work, thermodynamic modeling is coupled with guided experiments to study phase stability in this three-phase region of the Mo-Si-B-X (X = Ti, Zr, Hf) system. Both the calculated and experimental results show that additions of Zr and Hf limit significantly the stability of the three-phase region because of the formation of the ternary phases MoSiZr and MoSiHf, while Ti addition leads to a much larger region of stability for the three-phase equilibrium.

Original language	English
Pages (from-to)	541-548
Number of pages	8
Journal	Acta Materialia
Volume	58
Issue number	2
DOIs	https://doi.org/10.1016/j.actamat.2009.09.032
State	Published - Jan 2010
Externally published	Yes

Funding

This research was performed at the Oak Ridge National Laboratory (ORNL) and sponsored by the Air Force Office of Scientific and Research Contract No. FA 9550-09-C-0048 through the STTR program with Dr. Joan Fuller as the program manager under the Work-for-Others Program, IAN 14B583903, with the U.S. Department of Energy under contract DE-AC05-00OR22725 with UT-Battelle, LLC. We thank Dr. J. H. Schneibel (recently retired from ORNL), Cecil Carmichael, and Larry Walker (ORNL) for experimental support and discussion.

Keywords

CALPHAD
Multicomponent phase equilibrium
Refractory metals
Silicides
Thermodynamics

Access to Document

10.1016/j.actamat.2009.09.032

Cite this

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title = "Effects of Ti, Zr, and Hf on the phase stability of Mo\_ss + Mo3Si + Mo5SiB2 alloys at 1600 °C",

abstract = "Understanding the stability of the three-phase Mo\_ss + Mo3Si + Mo5SiB2 region is important for alloy design of Mo-Si-B-based refractory metal intermetallic composites. In this work, thermodynamic modeling is coupled with guided experiments to study phase stability in this three-phase region of the Mo-Si-B-X (X = Ti, Zr, Hf) system. Both the calculated and experimental results show that additions of Zr and Hf limit significantly the stability of the three-phase region because of the formation of the ternary phases MoSiZr and MoSiHf, while Ti addition leads to a much larger region of stability for the three-phase equilibrium.",

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AU - Yang, Ying

AU - Bei, H.

AU - Chen, Shuanglin

AU - George, E. P.

AU - Tiley, Jaimie

AU - Chang, Y. Austin

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AB - Understanding the stability of the three-phase Mo_ss + Mo3Si + Mo5SiB2 region is important for alloy design of Mo-Si-B-based refractory metal intermetallic composites. In this work, thermodynamic modeling is coupled with guided experiments to study phase stability in this three-phase region of the Mo-Si-B-X (X = Ti, Zr, Hf) system. Both the calculated and experimental results show that additions of Zr and Hf limit significantly the stability of the three-phase region because of the formation of the ternary phases MoSiZr and MoSiHf, while Ti addition leads to a much larger region of stability for the three-phase equilibrium.

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KW - Silicides

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