2023年2月
Tensile overload-induced texture effects on the fatigue resistance of a CoCrFeMnNi high-entropy alloy
ACTA MATERIALIA
- 巻
- 245
- 号
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1016/j.actamat.2022.118585
- 出版者・発行元
- PERGAMON-ELSEVIER SCIENCE LTD
The present study investigates the crystallographic-texture effects on the improved fatigue resistance in the CoCrFeMnNi high-entropy alloys (HEAs) with the full-size geometry of the American Society for Testing and Materials (ASTM) Standards E647-99. We exploited X-ray nano-diffraction (XND) mapping to characterize the crystal-deformation levels ahead of the crack tip after stress unloading under both constant-and tensile-overloaded-fatigue conditions. The crack-tip blunting-induced much higher deformation level was concen-trated surrounding the crack-tip which delays the fatigue-crack growth immediately after a tensile overload. The predominant deformation texture orientation in the Paris regime was investigated, using electron backscatter diffraction (EBSD) and orientation distribution function (ODF) analyses. The twinning formation-driven shear deformation gave rise to the development of the Goss-type texture within the plastic deformation regime under a tensile-overloaded-fatigue condition, which was attributed to enhance the crack deflection and thus the tensile-induced crack-growth-retardation period in the CoCrFeMnNi HEA. Our new findings address the quantitative discrepancy found in our earlier work.
- リンク情報
- ID情報
-
- DOI : 10.1016/j.actamat.2022.118585
- ISSN : 1359-6454
- eISSN : 1873-2453
- Web of Science ID : WOS:000906751500001