SEDL / STP / STP204-EB / STP44145S

The Effect of Temperature on the Uniform Elongation of Titanium Alloys

Holden, F C
Assistant Chief, Consultant, and Chief, Nonferrous Physical Metallurgy Division, Battelle Memorial Institute, Columbus, Ohio.

Ogden, H R
Assistant Chief, Consultant, and Chief, Nonferrous Physical Metallurgy Division, Battelle Memorial Institute, Columbus, Ohio.

Jaffee, R I
Assistant Chief, Consultant, and Chief, Nonferrous Physical Metallurgy Division, Battelle Memorial Institute, Columbus, Ohio.

Pages: 18    Published: Jan 1957

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Abstract

The limits of uniform elongation were measured for typical alpha, alpha-beta, and beta titanium alloys. Each alloy was studied in three microstructural conditions over a temperature range from −75 to 300 C (−103 to 570 F).

Highest uniform elongation was obtained for commercial titanium (alpha), whereas that for the beta-quenched 7.5 Cr, 7.5 Mo titanium alloy was low. The presence of massive alpha in the alpha-beta alloys increases their uniform elongation.

The dependence of uniform elongation on temperature is marked, particularly in the two-phase alloys. Maximum values were obtained at about 200 C (392 F).

Measurements of uniform elongation from residual strain agree well with values of δ^max; the values of the flow exponent (from the flow equation, σ = Bδⁿ) are consistently higher.