期刊
JOURNAL OF APPLIED CRYSTALLOGRAPHY
卷 46, 期 -, 页码 1397-1406出版社
WILEY-BLACKWELL
DOI: 10.1107/S002188981302253X
关键词
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资金
- Federation of Research for Aeronautics and Space (Federation de Recherche pour l'Aeronautique et l'Espace Theme Materiaux pour l'Aeronautique et l'Espace)
- project OPTIMIST (Optimisation de la mise en forme d'alliages de titane)
- Chinese Postdoctoral Science Foundation [2012M520634]
- Fundamental Research Funds for the Central Universities [N120309003]
Commercial pure titanium (T40) was deformed in channel die compression by means of the split-sample technique in order to study multiple twinning. Particular attention was paid to the twin variant presentation and selection during multiple twinning. All possible misorientations, corresponding to the multiple twins arising from the combination of the {11 (2) over bar2} compression (C) twin, the {10 (2) over bar2} tension twin (T1) and the {11 (2) over bar1} tension twin (T2), were calculated with respect to the crystal basis of the matrix grain. All the multiple twin variants are partitioned into ten classes with the same crystallographically equivalent misorientation angle and axis. However, when the influence of twinning order is taken into account, the multiple twin variants are partitioned into 15 classes. Experimental results prove that the selection of twin variants (primary and secondary) is mainly governed by their macroscopic Schmid factor (SF). The normalized SF is more efficient at predicting variant selection. A twin formed in one grain can activate another twin in a neighbouring grain, provided that the angle between the two twinning planes does not exceed 20 degrees.
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