Use of Weibull statistics to quantify property variability in TiAl alloys

被引:15
作者
Biery, N [1 ]
De Graef, M
Beuth, J
Raban, R
Elliott, A
Austin, C
Pollock, TM
机构
[1] Exxon Mobile Upstream Res Co, Houston, TX USA
[2] GE Co, Aircraft Engines, Cincinnati, OH 45215 USA
[3] Univ Michigan, Dept Mat Sci & Engn, Ann Arbor, MI 48109 USA
[4] Pratt & Whitney, E Hartford, CT USA
[5] Carnegie Mellon Univ, Dept Mech Engn, Pittsburgh, PA 15213 USA
[6] Carnegie Mellon Univ, Dept Mat Sci & Engn, Pittsburgh, PA 15213 USA
来源
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2002年 / 33卷 / 10期
关键词
D O I
10.1007/s11661-002-0298-8
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
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 pet plastic strain to failure in tension. By using the three-parameter form of the Weibull relation, with the 0.2 pet 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.
引用
收藏
页码:3127 / 3136
页数:10
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