日本金属学会誌

J. Japan Inst. Metals, Vol. 41, No. 9 (1977),
pp. 933-939

The Effect of Deformation Twinning on Mechanical Properties of α -Titanium Alloys at Low Temperatures

Hisaoki Sasano1 and Hirozo Kimura1

1National Research Institute for Metals, Tokyo

Abstract:

The effect of deformation twinning on the mechanical properties of α -solid solution titanium alloys containing various substitutional elements has been investigated. The results obtained are summarized as follows:
(1) Almost all of the twins observed in the specimen deformed below 25°C are identified as 11 22.
(2) The easiness of 11 22 twinning increases with the decrease of c/a ratio.
(3) Stress-strain curves show a linear work hardening character and a large work hardening rate with deformation twinning.
(4) If the prestrain at -196°C and the subsequent deformation at 25°C are added, the total elongation and the work hardening rate become greater than those of a specimen deformed only at 25°C.
(5) The increase of the work hardening rate is considered to be due to the number of the twin than the volume fraction of the twin. The effect of deformation twinning on the mechanical properties is similar to that of grain size refinning.


(Received 1977/03/26)

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