DSpace ???jsp.layout.header-default.logo???
 

Yokohama National University Repository >
05 工学研究院・工学府・工学部・理工学部 = 05 Faculty of Engineering / Graduate School of Engineering / College of Engineering Science >
5-1 学術雑誌論文 >

Please use this identifier to cite or link to this item: http://hdl.handle.net/10131/7913

Title: Cyclic deformation, dislocation structure, and internal fatigue crack generation in a Ti-Fe-O alloy at liquid nitrogen temperature
Authors: Yokoyama, Hisanaga
Umezawa, Osamu
Nagai, Kotobu
Suzuki, Takashi
Kokubo, Kunio
ヨコヤマ, ヒサナガ
ウメザワ, オサム
ナガイ, コトブ
スズキ, タカシ
コクボ, クニオ
Issue Date: Nov-2000
Publisher: ASM International
Abstract: To clarify the internal fatigue crack generation in a Ti-Fe-O (near α-type) alloy, microstructures, internal fatigue crack initiation sites, and dislocation structures in samples fractured during high-cycle fatigue tests at liquid nitrogen temperature were studied. The alloy contained two kinds of elongated α-phase microstructures, i.e., recovered α grains and recrystallized α grains. Untested samples contained mobile dislocations in recovered αgrains, but in recrystallized α grains, any dislocations were observed. Internal crack initiation sites were formed transgranularly and were related to the recrystallized α grain region, judging from their morphology, size, and chemistry. Dislocations in revovered α grains were rearranged after cyclic loading in either {0110}-<1120> planar arrays or subgrain structures due to dislocation annihilation. Few dislocations were seen in recrystallized α grains. We discuss the relationship between localized strain incompatibility due to coplanar arrays in recovered α grains and transgranular cracking in recrystallized α grains, and propose a model for fatigue crack generation.
URI: http://hdl.handle.net/10131/7913
Appears in Collections:5-1 学術雑誌論文

Files in This Item:

File Description SizeFormat
A-33 MMT31A11.pdf4.46 MBAdobe PDFView/Open

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

 

Valid XHTML 1.0! DSpace Software Copyright © 2002-2010  Duraspace