Abstract
Uniaxial tension experiments and electron back-scatter diffraction were performed on a bimodal Ti-6Al-4V alloy to study the deformation behavior of primary hcp-Ti (αp). It was found that the obtained tensile strength and elongation of the studied Ti-6Al-4V from the in-situ tensile test are higher than of which derived from the regular tensile test. The strain could be accommodated by the activation of slip systems and by grain rotations during the deformation. The prismatic slip is the primary slip mode of αp. According to kernel average misorientation analysis, we found that the dislocations mainly distributed near grain boundaries and subgrain boundaries, and partially located around slip lines. Calculated rotation angles and average rotation rates show that the rotation heterogeneity occurred among grains and subgrains.
Highlights
A typical Ti-6Al-4V with bimodal microstructure consists of equiaxed primary hcp-Ti and lamellar secondary alpha/bcc-Ti (β)
The tensile strength and elongation of the specimen obtained by the in-situ tensile test were higher than of the sample obtained by regular tensile test
This phenomenon may be caused by the creep deformation that happened during the loading stops of the in-situ tensile test [11]
Summary
A typical Ti-6Al-4V with bimodal microstructure consists of equiaxed primary hcp-Ti (αp) and lamellar secondary alpha (αs)/bcc-Ti (β). Many studies have devoted to the process of strain-induced twinning [2], slip transmission [3,4], active slip system [5,6], and the effect of strain rate [7,8] on the titanium alloys with dual phases using tension or compression experiments. It was found in the aluminum alloy that grain rotation would undergo under the plastic deformation [9,10]. The slip systems and grain rotation behavior during deformation were discussed
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