Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 22    No. 7    July 2012

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Effect of electropulsing on dislocation mobility of titanium sheet
SONG Hui1, WANG Zhong-jin2

1. School of Astronautic, Harbin Institute of Technology, Harbin 150001, China;
2. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China

Abstract:To investigate the effect of the electropulsing on dislocation mobility, specimens cut from the cold-rolled titanium sheet were treated by high density electropulsing with the maximum current density of 7.22, 7.64, 7.96 kA/mm2, pulse period 110 μs. The internal friction and elastic modulus were measured by a dynamic mechanical analyzer (DMA). When strain amplitude lowers a certain critical one, the damping of the electropulsed titanium sheet is lower than that of the cold-rolled one. When the strain amplitude exceeds the critical one, the damping of the electropulsed titanium sheet is extraordinarily higher than that of the cold-rolled or conventional annealed one. Furthermore, it is found that the damping peak of the electropulsed titanium sheet shifts to lower temperature compared with the conventional annealed one. It is demonstrated that the electropulsing treatment can decrease dislocation tangles and enhance dislocation mobility.

 

Key words: titanium alloys; dislocation mobility; damping; electropulsing

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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