An investigation of the fatigue and fracture behavior of mn-containing gamma titanium aluminides |
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Authors: | W O Soboyejo C Mercer K Lou S Heath |
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Affiliation: | (1) Department of Materials Science and Engineering, The Ohio State University, 43210-1179 Columbus, OH;(2) Union College, 12301 Schenectady, NY;(3) AGA Gas Company, S-181 31 Lidingo, Sweden |
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Abstract: | The fatigue and fracture mechanisms in Ti-48Al-xMn (x = 1.4 to 2.0 at. pct) gamma-based titanium aluminide alloys are elucidated.
Unlike most gamma alloys, which fail predominantly by transgranular fracture at room temperature, fracture in ternary Ti-48Al-xMn
alloys is shown to occur mainly by intergranular failure. The incidence of intergranular failure increased with increasing
annealing duration and temperature. Intergranular fracture is shown to occur as a result of the segregation of Mn to equiaxed
and interlamellar boundaries. Annealing either above or below the eutectoid temperature results in the precipitation of α2 particles. The reduction in the strength and toughness of ternary Mn-containing alloys is attributed to the combined effects
of segregation and α2 precipitation. A micromechanics framework is presented for the assessment of twin toughening mechanisms under monotonie and
cyclic loading.
Formerly Staff Scientist with General Electric Research and Development, Schenectady, NY 12301
Formerly Undergraduate Student, Department of Materials Science and Engineering, The Ohio State University |
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