Fatigue crack propagation behaviors of ultrafine grained (UFG) Al sheets fabricated by the accumulative roll bonding (ARB) process were investigated. The ARB process was carried out up to 6 cycles (equivalent strain, εeq.=4.8). The ARB processed sheet had lamellar boundary structure elongated to rolling direction of the sheet. The mean spacing of the boundaries was 182 nm. The tensile strength of the starting Al sheet increased after the 6-cycle of the ARB. Fatigue crack growth tests were performed to clarify the crack growth rate and threshold stress intensity factor range for crack growth (ΔKth). The fatigue crack profile in the ARB processed sheet differs from that in the starting Al sheet. The ΔK th of the ARB processed sheet was smaller than that of the starting sheet. The ΔKth of Al would decreased with decreasing the crack closure phenomena after the 6-cycle of the ARB. The fatigue crack growth rate test shows that the critical load for starting to propagate the fatigue crack and the fatigue crack growth rate decreased by ultrafine grain refinement.
雑誌名
Materials Science Forum
号
654-656
ページ
2479 - 2482
発行年
2010-06
DOI
10.4028/www.scientific.net/MSF.654-656.2479
情報源(ISSN)
02555476
フォーマット
application/pdf
形態
1146414 bytes
著者版フラグ
author
日本十進分類法
511.48
出版者
Trans Tech Publications
資源タイプ
論文(Article)
資源タイプ・ローカル
会議発表論文
資源タイプ・NII
Journal Article
資源タイプ・DCMI
text
資源タイプ・ローカル表示コード
01
URL
http://www.scientific.net/MSF.654-656.2479
コメント
7th Pacific Rim International Conference on Advanced Materials and Processing, PRICM-7; Cairns, QLD; 2 August 2010 through 6 August 2010; Code 81388