書誌事項
- タイトル別名
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- Crystallographic Orientation Analysis of Fatigue Crack Initiation Site Formed at Cryogenic Temperatures in Ti-5Al-2.5Sn ELI Forged Alloy
- 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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説明
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.
収録刊行物
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- 日本機械学会論文集Ａ編
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日本機械学会論文集Ａ編 74 (739), 329-334, 2008
一般社団法人 日本機械学会
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詳細情報 詳細情報について
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- CRID
- 1390282679456002688
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- NII論文ID
- 110006643454
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- NII書誌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書誌ID
- 9437802
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- NDL
- Crossref
- CiNii Articles
- KAKEN
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- 抄録ライセンスフラグ
- 使用不可