Crystallographic Orientation Analysis of Fatigue Crack Initiation Site Formed at Cryogenic Temperatures in Ti-5Al-2.5Sn ELI Forged Alloy
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- ONO Yoshinori
- Materials Reliability Center, National Institute for Materials Science
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- DEMURA Masahiko
- Materials Reliability Center, National Institute for Materials Science
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- YURI Tetsumi
- Materials Reliability Center, National Institute for Materials Science
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- OGATA Toshio
- Materials Reliability Center, National Institute for Materials Science
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- MATSUOKA Saburo
- 九州大学大学院工学研究院
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- HORI Syuusuke
- (独) 宇宙航空研究開発機構
Bibliographic Information
- Other Title
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- Ti‐5Al‐2.5Sn ELI合金鍛造材における極低温疲労破壊起点部の結晶方位解析
- Ti 5 Al 2 5 Sn ELI ゴウキン タンゾウザイ ニ オケル キョクテイオン ヒロウ ハカイ キテンブ ノ ケッショウ ホウイ カイセキ
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Description
Tensile and high-cycle fatigue properties were investigated at cryogenic temperatures of 4K, 20 K and 77K for Ti-5%Al-2.5%Sn extra low interstitial (ELI) forged alloy. High-cycle fatigue strength is relatively low compared to that at ambient temperature in spite of the high tensile strength. In the specimens fatigue-tested at cryogenic temperatures, a facet was observed at a fatigue crack initiation site. The crystallographic orientation of the facet was determined by electron backscatter diffraction (EBSD) method in a scanning electron microscope (SEM). The SEM-EBSD analyses revealed that the facet plane was {1121}, which is one of twin planes in alpha-type titanium. There were some terraces on the facet and their orientation had {1121} twin relationship to that of the other part (matrix). These results show that the {1121} twins were formed during cyclic loading, leading to the fatigue crack initiation at {1121} twin/matrix interface. Probably, this twin-assisted crack initiation degrades the high-cycle fatigue properties of the present alloy.
Journal
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- TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A
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TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A 74 (739), 329-334, 2008
The Japan Society of Mechanical Engineers
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Details 詳細情報について
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- CRID
- 1390282679456002688
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- NII Article ID
- 110006643454
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- NII Book ID
- AN0018742X
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- COI
- 1:CAS:528:DC%2BD1cXntVals78%3D
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- ISSN
- 18848338
- 03875008
- http://id.crossref.org/issn/03875008
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- NDL BIB ID
- 9437802
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
- KAKEN
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- Abstract License Flag
- Disallowed