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Initiation and accommodation of primary twins in high-purity titanium.
- Source :
-
Acta Materialia . Jun2014, Vol. 71, p293-305. 13p. - Publication Year :
- 2014
-
Abstract
- Abstract: Uniaxial compression tests were carried out at room temperature and at strain rates of 0.001, 0.01, 0.1 and 1s−1 on samples of high-purity titanium. The initial texture was favorably oriented for contraction twinning. The double-differentiation method was employed to detect the initiation of twinning as well as of dynamic recrystallization. Critical strains of about −0.24 and −0.65 were determined, respectively, for these two mechanisms. The relevant mechanisms were identified by means of electron backscatter diffraction (EBSD) techniques. At a true strain of ε =−0.3, two main kinds of primary twins, contraction and extension, were observed and second-generation twins were also identified by means of the EBSD analysis. The presence of low Schmid factor (SF) (<0.2) twins was established as well as the absence of potential high SF (>0.4) twins. The appearance of the low SF twins is explained in terms of the low accommodation work required in the neighboring grains; this involves prismatic glide in the present case. The absence of the potential high SF twins, on the other hand, is justified as requiring the operation of a combination of several difficult deformation modes: basal glide, pyramidal glide, and twinning. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 13596454
- Volume :
- 71
- Database :
- Academic Search Index
- Journal :
- Acta Materialia
- Publication Type :
- Academic Journal
- Accession number :
- 95724106
- Full Text :
- https://doi.org/10.1016/j.actamat.2014.03.025