Thermodynamic Modeling and Mechanical Testing for the Multiphase Mo-Si-B-X (X=Ti, Zr, Hf) Alloy for High Temperature (1300ºC-1500ºC) Services

Award Information
Agency: Department of Defense
Branch: Air Force
Contract: FA9550-08-C-0024
Agency Tracking Number: F074-003-0141
Amount: $99,985.00
Phase: Phase I
Program: STTR
Awards Year: 2008
Solicitation Year: 2007
Solicitation Topic Code: AF07-T003
Solicitation Number: N/A
Small Business Information
COMPUTHERM LLC
437 S. Yellowstone Dr, Suite 217, Madison, WI, 53719
DUNS: 939950622
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: Y
Principal Investigator
 Fan Zhang
 Materials Scientist
 (608) 274-1414
 Fan.Zhang@computherm.com
Business Contact
 Y. Chang
Title: President
Phone: (608) 274-1414
Email: chang@chorus.net
Research Institution
 OAK RIDGE NATIONAL LABORATORY
 Joachim H Schneibel
 P.O. Box 2008
Oak Ridge, TN, 37831
 (865) 576-4644
 Federally funded R&D center (FFRDC)
Abstract
CompuTherm, LLC in collaboration with Oak Ridge National Laboratory proposes to develop a modeling tool that can be used to understand the effect of Ti, Zr, and Hf addition on the improvement of ductility of the (Mo) phase in the Mo-Si-B system. The tool will be developed by integrating thermodynamic modeling with mechanical testing. Thermodynamic descriptions of the Mo-Si-B-X (X=Ti, Zr, Hf) systems will be developed using the state-of-art Calphad approach. Using these descriptions, we can calculate phase equilibrium and related information and determine the Si solubility in the (Mo) phase as a function of Ti, Zr, or Hf concentration, which will lead us finding ways of reducing the embrittle silicon concentration in the (Mo) phase. Such calculations will also reveal new heterogeneous phase equilibria that will form other than (Mo)+Mo3Si-T2-Mo5SiB2 due to the addition of Ti, Zr, or Hf. Quaternary alloys with potential combined optimum properties will be identified for experimental study including alloy fabrication and homogenization, microstructural characterization, and mechanical testing. This work will provide key input for the development of deformation model, and is critically needed in accelerating alloy design and property optimization of the Mo-Si-B-X (X=Ti, Zr, Hf) alloys.

* information listed above is at the time of submission.

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