Crack closure in the fatigue crack propagation of a Cu-2wt.%Be alloy in dry air and ammoniacal solution
Fatigue cracking was investigated by measuring the crack closure of unaged and peak-aged Cu-2wt %Be alloy specimens in 0.05 M Cu 2+-containing 1 M ammoniacal solution using an unloading elastic compliance technique and by comparing the results with those obtained in dry air. The anodic behaviour of...
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Published in | Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 206; no. 1; pp. 49 - 54 |
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Main Authors | , |
Format | Journal Article |
Language | English |
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Amsterdam
Elsevier B.V
15.02.1996
Elsevier |
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Abstract | Fatigue cracking was investigated by measuring the crack closure of unaged and peak-aged Cu-2wt %Be alloy specimens in 0.05 M Cu
2+-containing 1 M ammoniacal solution using an unloading elastic compliance technique and by comparing the results with those obtained in dry air. The anodic behaviour of both kinds of specimen in the ammoniacal solution was also investigated by potentiodynamic polarization and potentiostatic current transient experiments. In dry air, a plateau m the fatigue crack propagation (FCP) rate vs ΔK
eff plot was observed for both kinds of specimen at relatively high ΔK
eff values. This can be accounted for in terms of the retardation of FCP due to the accumulated strain released by the formation of a shear band at the crack tip. The intrinsic FCP rate of the unaged specimen in the ammoniacal solution exceeded that of the peak-aged specimen; however, the apparent value showed the opposite trend. The anodic dissolution of the unaged specimen in the ammoniacal solution was slightly larger than that of the peak-aged specimen. The unaged specimen showed a higher crack closure in the ammoniacal solution than the peak-aged specimen. The high crack closure of the unaged specimen in the ammoniacal solution is due to the relatively inhomogeneous deformation and severe corrosion attack compared with the peak-aged specimen. |
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AbstractList | Fatigue cracking was investigated by measuring the crack closure of unaged and peak-aged Cu-2wt %Be alloy specimens in 0.05 M Cu
2+-containing 1 M ammoniacal solution using an unloading elastic compliance technique and by comparing the results with those obtained in dry air. The anodic behaviour of both kinds of specimen in the ammoniacal solution was also investigated by potentiodynamic polarization and potentiostatic current transient experiments. In dry air, a plateau m the fatigue crack propagation (FCP) rate vs ΔK
eff plot was observed for both kinds of specimen at relatively high ΔK
eff values. This can be accounted for in terms of the retardation of FCP due to the accumulated strain released by the formation of a shear band at the crack tip. The intrinsic FCP rate of the unaged specimen in the ammoniacal solution exceeded that of the peak-aged specimen; however, the apparent value showed the opposite trend. The anodic dissolution of the unaged specimen in the ammoniacal solution was slightly larger than that of the peak-aged specimen. The unaged specimen showed a higher crack closure in the ammoniacal solution than the peak-aged specimen. The high crack closure of the unaged specimen in the ammoniacal solution is due to the relatively inhomogeneous deformation and severe corrosion attack compared with the peak-aged specimen. |
Author | Pyun, Su-Il Chun, Young-Gab |
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Cites_doi | 10.1016/0001-6160(80)90086-3 10.1016/0001-6160(86)90242-7 10.5006/0010-9312-36.5.260 10.1016/S0010-938X(71)80029-X 10.5006/1.3583917 10.1016/0956-7151(90)90294-Q 10.1016/0025-5416(88)90547-2 10.1179/030634582790427497 10.1111/j.1460-2695.1995.tb00890.x 10.5006/0010-9312-25.4.168 10.1111/j.1460-2695.1995.tb00881.x 10.1016/0013-4686(92)87080-J 10.1179/imr.1992.37.1.45 |
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Keywords | Crack propogation Fatigue cracking Polarization diagram Ruptures Crack closure effect Mechanical properties Fatigue Copper base alloys Experimental study Environmental effects Crack propagation Binary alloys Ammonia Potentiodynamic method Beryllium alloys Aqueous solutions Dry air Transition element alloys |
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Snippet | Fatigue cracking was investigated by measuring the crack closure of unaged and peak-aged Cu-2wt %Be alloy specimens in 0.05 M Cu
2+-containing 1 M ammoniacal... |
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SubjectTerms | Applied sciences Crack propogation Cross-disciplinary physics: materials science; rheology Exact sciences and technology Fatigue cracking Fatigue, corrosion fatigue, embrittlement, cracking, fracture and failure Fatigue, embrittlement, and fracture Materials science Metals. Metallurgy Physics Treatment of materials and its effects on microstructure and properties |
Title | Crack closure in the fatigue crack propagation of a Cu-2wt.%Be alloy in dry air and ammoniacal solution |
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