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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/50248

Title: Microtwin formation in the α phase of duplex titanium alloys affected by strain rate
Authors: Yi-Hsiang Lin
Shu-Ming Wu
Fang-Hsin Kao
Shing-Hoa Wang
Jer-Ren Yang
Chia-Chih Yang
Chuan-Sheng Chiou
Contributors: 國立臺灣海洋大學:機械與機電工程學系
Keywords: Duplex titanium alloy
Twin
Dislocation
Date: 2011-03
Issue Date: 2018-09-27T02:34:07Z
Publisher: Materials Science and Engineering A
Abstract: Abstract: The effect of tensile strain rate on deformation microstructure was investigated in Ti-6-4 (Ti–6Al–4V) and SP700 (Ti–4.5Al–3V–2Mo–2Fe) of the duplex titanium alloys. Below a strain rate of 10−2 s−1, Ti-6-4 alloy had a higher ultimate tensile strength than SP700 alloy. However, the yield strength of SP700 was consistently greater than Ti-6-4 at different strain rates. The ductility of SP700 alloy associated with twin formation (especially at the slow strain rate of 10−4 s−1), always exceeded that of Ti-6-4 alloy at different strain rates. It is caused by a large quantity of deformation twins took place in the α phase of SP700 due to the lower stacking fault energy by the β stabilizer of molybdenum alloying. In addition, the local deformation more was imposed on the α grains from the surrounding β-rich grains by redistributing strain as the strain rate decreased in SP700 duplex alloy.
Relation: 528(6) pp.2271-2276
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/50248
Appears in Collections:[機械與機電工程學系] 期刊論文

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