Use of weibull statistics to quantify property variability in TiAl alloys |
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| Authors: | Nicholas Biery Marc De Graef Jack Beuth Rafel Raban Andrew Elliott Tresa M. Pollock Curt Austin |
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| Affiliation: | (1) Exxon Mobile Upstream Research Co., Houston, TX;(2) Department of Materials Science and Engineering, Carnegie Mellon University, 15213 Pittsburgh, PA;(3) Department of Mechanical Engineering, Carnegie Mellon University, 15213 Pittsburgh, PA;(4) Pratt & Whitney, East Hartford, CT;(5) the Department of Materials Science and Engineering, University of Michigan, 48109 Ann Arbor, MI;(6) Present address: GE Aircraft Engines, 45215 Cincinnati, OH |
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| Abstract: | Tensile experiments have been performed on specimens of four different investment-cast TiAl-based alloys with variations in casting conditions. The average ductilities obtained in these experiments vary between approximately 0.8 to 2.0 pct plastic strain to failure in tension. By using the three-parameter form of the Weibull relation, with the 0.2 pct offset yield strength as the minimum failure strength, the resulting variability in the data can be quantified and is found to be similar for those alloys with similar microstructural scale (grain size). Large variations in lamellar volume fraction, segregation, and phase distribution have a minor influence on property variability, compared to changes in the scale of the grain structure caused by either variations in cooling rate during casting or the addition of grain refiners. |
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