Fatigue fracture mechanism of extruded Al alloy 7075-T6 in high humidity

K. Kariya, N. Kawagoishi, H. Maeda, Qiang Chen, M. Goto, Y. Nu

研究成果: 書籍/レポート タイプへの寄稿会議への寄与

4 被引用数 (Scopus)

抄録

Effect of high humidity on growth mechanism of a fatigue crack was investigated for an extruded bar of an age-hardened Al alloy 7075-T6 which had the marked texture of plane (111). Fracture in high humidity occurred by the growth of a shear mode crack under high stress levels, though a crack propagated in a tensile mode under low stress ones, macroscopically. Many voids and slip planes were observed on the fracture surface yielded by the shear mode crack. Especially most of the fracture surface was occupied by voids where the crack was small. The void percentage decreased with increasing in the crack depth. Fracture surface yielded by the shear mode crack was a plane (100). The growth direction of the shear mode crack to the cross section of specimen was about 55° corresponding to the angle composed by this plane and the texture of plane (111). These results suggest that the shear mode crack was related to microstructure, stress and environment. The growth mechanism of the shear mode crack assisted by hydrogen was proposed based on the results of the acceleration of crack growth and the formation of voids in high humidity.

本文言語英語
ホスト出版物のタイトルAdvances in Fracture and Damage Mechanics X
ページ45-48
ページ数4
DOI
出版ステータス出版済み - 1月 1 2012
外部発表はい
イベント10th International Conference on Fracture and Damage Mechanics, FDM2011 - Dubrovnik, クロアチア
継続期間: 9月 19 20119月 21 2011

出版物シリーズ

名前Key Engineering Materials
488-489
ISSN(印刷版)1013-9826

その他

その他10th International Conference on Fracture and Damage Mechanics, FDM2011
国/地域クロアチア
CityDubrovnik
Period9/19/119/21/11

!!!All Science Journal Classification (ASJC) codes

  • 材料科学(全般)
  • 材料力学
  • 機械工学

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