Effects of Ti, Zr, and Hf on the Phase Stability of Mo-Mo₃Si+Mo₅SiB₂ Alloys at 1600 C

Journal Article · Fri Jan 01 00:00:00 EST 2010 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2009.09.032· OSTI ID:979286

Yang, Ying ^[1]; Bei, Hongbin ^[2]; Chen, Shuanglin ^[1]; George, Easo P ^[2]; Tiley, Jaimie ^[3]; Chang, Y. Austin ^[4]

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1. CompuTherm LLC, Madison, WI
2. ORNL
3. Air Force Research Laboratory, Wright-Patterson AFB, OH
4. University of Wisconsin, Madison

Understanding the stability of the three-phase Mo{_}+Mo{sub 3}Si+Mo{sub 5}SiB{sub 2} 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.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: Work for Others (WFO)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 979286
• Journal Information: Acta Materialia, Vol. 58, Issue 2; ISSN 1359-6454
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALLOYS
DESIGN
PHASE STABILITY
REFRACTORY METALS
SIMULATION
STABILITY
THERMODYNAMICS