Processing and mechanical properties of materials in the Hf–N system

• Published in: Journal of the European Ceramic Society Vol. 22; no. 14; pp. 2571 - 2576
• Main Authors: Wuchina, Eric, Opeka, Mark, Gutierrez-Mora, Felipe, Koritala, Rachel E., Goretta, K.C., Routbort, J.L.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Oxford Elsevier Ltd 2002; Elsevier
• Subjects: Applied sciences; Brittle–to–ductile transition (temperature); Building materials. Ceramics. Glasses; Ceramic industries; Chemical industry and chemicals; Dislication–based plasticity; Exact sciences and technology; Hf–N alloys; Hf–N solid solutions; Solid–solution hardening; Stress exponent; Structural ceramics; Technical ceramics; Threshold stress; Stress exponent; Hf–N solid solutions; Brittle–to–ductile transition (temperature); Hf–N alloys; Solid–solution hardening; Threshold stress; Dislication–based plasticity; Phase diagram; Mechanical properties; Experimental study; Solid solution; Non oxide ceramics; Structural ceramic; Dislocation; Ductile brittle transition; Hexagonal lattices; Sintering; Plasticity; Manufacturing; Hafnium Nitrides
• ISSN: 0955-2219; 1873-619X
• DOI: 10.1016/S0955-2219(02)00118-8

Samples of hexagonal α-Hf containing up to 30 at.% N in solid solution were made by a solid-state reaction. The brittle-to-ductile transition temperature increased as the %N increased. Steady-state compressive deformation has been measured from 20 to 1000 °C. The data for pure Hf could be fit using a threshold stress with a stress exponent of 5. The stress exponent of the Hf–N solid solution materials was between 5 and 8. The experiments could be interpreted on the basis of dislocation-controlled plasticity, with N acting as classical solid-solution hardening solutes. Transmission electron microscopy supported this interpretation.