Hisaoki Sasano1 and Hirozo Kimura1
1National Research Institute for Metals, Tokyo
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 2.
(2) The easiness of 11 2 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.
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