The objective of this research was to obtain and compare constant and variable amplitude fatigue behavior of AZ91E-T6 cast magnesium alloy in both an air and 3.5 percent NaCl aqueous corrosive environment. An additional objective was to determine if commonly used models that describe fatigue behavior and fatigue life are applicable to this material and test environment. Fatigue tests included constant amplitude strain-controlled low cycle fatigue with strain ratio, R, equal to 0, −1 and −2, Region II constant amplitude fatigue crack growth with load ratio, R, equal to 0.05 and 0.5 and variable amplitude fatigue tests using keyhole notched specimens. In all fatigue tests, the corrosion environment was significantly detrimental relative to the air environment. Mean strains influenced fatigue life only if accompanied by significant mean stress. The Morrow and Smith, Watson, and Topper mean stress models provided both accurate and inaccurate fatigue life calculations. Likewise, variable amplitude fatigue life calculations using the local strain approach and based upon the formation ofal mm crack at the keyhole notch were both accurate and fairly inaccurate depending on the specific model used.
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July 1995
Technical Papers
Corrosion Fatigue of AZ91E-T6 Cast Magnesium Alloy in a 3.5 Percent NaCl Aqueous Environment
R. I. Stephens,
R. I. Stephens
Mechanical Engineering Department, The University of Iowa, lowa City, IA 52242
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C. D. Schrader,
C. D. Schrader
Mechanical Engineering Department, The University of Iowa, lowa City, IA 52242
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K. B. Lease
K. B. Lease
Mechanical Engineering Department, The University of Iowa, lowa City, IA 52242
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R. I. Stephens
Mechanical Engineering Department, The University of Iowa, lowa City, IA 52242
C. D. Schrader
Mechanical Engineering Department, The University of Iowa, lowa City, IA 52242
K. B. Lease
Mechanical Engineering Department, The University of Iowa, lowa City, IA 52242
J. Eng. Mater. Technol. Jul 1995, 117(3): 293-298 (6 pages)
Published Online: July 1, 1995
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June 23, 1994
Online:
November 27, 2007
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Stephens, R. I., Schrader, C. D., and Lease, K. B. (July 1, 1995). "Corrosion Fatigue of AZ91E-T6 Cast Magnesium Alloy in a 3.5 Percent NaCl Aqueous Environment." ASME. J. Eng. Mater. Technol. July 1995; 117(3): 293–298. https://doi.org/10.1115/1.2804542
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