Microstructure and mechanical properties relationships in the Ti-11 alloy at room and elevated temperatures |
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Authors: | D Eylon J A Hall C M Pierce D L Ruckle |
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Affiliation: | (1) Present address: the Department of Materials Science and Metallurgical Engineering, University of Cincinnati, 45221 Cincinnati, OH;(2) Present address: Titanium Metals Corporation of America, Henderson, NV, 89005;(3) the Air Force Materials Laboratory, 45433 Wright-Patterson Air Force Base, OH;(4) Pratt and Whitney Aircraft, East Hartford, CT |
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Abstract: | To establish correlations between microstructure and mechanical properties for the Till alloy, twelve different combinations
of hot die forging and heat treatment, in the α+β and β phase regions, were investigated. The resulting heat treated forgings
were classified into four distinct categories based on their microstructural appearance. The room temperature tensile, post-creep
tensile, fracture toughness and fatigue crack propagation properties were measured along with creep and low cycle fatigue
at 566°C. The creep, tensile, fatigue crack propagation and fracture toughness properties, grouped in a manner similar to
the microstructural categories. The fracture appearance and behavior of the cracks during propagation in fatigue and in fracture
toughness tests were examined, and correlations with the microstructure discussed. In the case of the fully transformed acicular
microstructure, it was found that the size and the orientation of colonies of similarly aligned α needles are dominant factors
in the crack behavior. |
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Keywords: | |
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