Microstructure-dependent fatigue behavior of aged Cu-6Ni-1.5Si alloy with discontinuous/cellular precipitates
| Autor: | S.S. Kim, Sung Hwan Lim, Terutoshi Yakushiji, Seung Zeon Han, Takaei Yamamoto, Masahiro Goto, J.H. Ahn, Takashi Iwamura, J. Kitamura, Jong-Hyeon Lee |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Precipitation (chemistry) 020502 materials Mechanical Engineering Alloy 02 engineering and technology engineering.material 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure Fatigue limit Matrix (chemical analysis) 0205 materials engineering Mechanics of Materials Electrical resistivity and conductivity Ultimate tensile strength engineering General Materials Science Composite material 0210 nano-technology |
| Zdroj: | Materials Science and Engineering: A. 747:63-72 |
| ISSN: | 0921-5093 |
| DOI: | 10.1016/j.msea.2019.01.057 |
| Popis: | The effect of microstructure on the fatigue strength of age-hardened Cu–6Ni–1.5Si alloy was investigated in this study. The aging was conducted at 500 °C for 0.5 h for the precipitation of disk-shaped δ-Ni2Si precipitates (continuous precipitates) and 3 h for the discontinuous precipitation of fiber-shaped, stable δ-Ni2Si precipitates to strengthen the Cu matrix. The tensile strength of 0.5 h-aged specimens was about 1.3 times greater than that of the 3 h-aged counterparts, but with inferior electrical conductivity. Despite the considerable difference in tensile strength, no notable difference in fatigue strength was observed between 0.5 h- and 3 h-aged specimens. The 3 h-aged specimens had superior electrical conductivity without sacrificing fatigue strength of the 0.5 h-aged specimens. The physical background of high-cycle fatigue strength in Cu–6Ni–1.5Si alloys with continuous precipitates and discontinuous precipitates is discussed considering the microstructure-sensitive behavior of fatigue cracks. |
| Databáze: | OpenAIRE |
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