Rapid Consolidation of Gamma Titanium Aluminide Powders Attrition Milled to Submicron Scale

Autor:	Norman M. Wereley, Ramachandran Radhakrishnan, Tirumalai S. Sudarshan, Kunal Kothari
Rok vydání:	2013
Předmět:	Titanium aluminide Materials science Mechanical Engineering Metallurgy Intermetallic Microstructure Industrial and Manufacturing Engineering Grain size chemistry.chemical_compound chemistry Mechanics of Materials Powder metallurgy General Materials Science Lamellar structure Particle size Stearic acid
Zdroj:	Materials and Manufacturing Processes. 28:1171-1178
ISSN:	1532-2475 1042-6914
DOI:	10.1080/10426914.2013.812216
Popis:	Commercially available micron-sized gamma titanium aluminide powders with Ti-50%Al and Ti-48%Al-2%Cr-2%Nb (at%) composition were milled in an attrition mill for 5 hours and 8 hours, respectively, with 2 wt% stearic acid. Milling resulted in a decrease of the average powder particle size by 60%, which implies submicrometer range powders, with no change in the powder composition. The milled powders were consolidated to produce a near-gamma microstructure and fully lamellar microstructure for Ti-50%Al and Ti-48%Al-2%Cr-2%Nb composition samples, respectively. A significant decrease in grain size was realized for the samples consolidated from the milled powders as compared to samples consolidated from as-received powders. The decrease in grain size improved flexure strength and elongation.
Databáze:	OpenAIRE
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