Effects of immersion in simulated body fluid on the fatigue and corrosion behavior of biodegradable WE54 magnesium alloy

Abstract

Fatigue and tensile behaviors of homogenized WE54 magnesium alloy before and after immersion in simulated body fluid (SBF) were investigated. According to the tensile test, the alloy without immersion in SBF solution has the highest tensile strength of 278 MPa, which decreased to 190 MPa after 336 h of immersion.. The fatigue life of the homogenized WE54 magnesium alloy before immersion in the SBF solution under a constant stress of 15 MPa is 3598 cycles. However, the fatigue life of the alloy decreased to 453 cycles after 336 h of immersion in the SBF solution under the same stress. Examination of the fracture surface of the samples by SEM reveals that the origin of the fatigue crack before immersion is micro-pores and defects. While corrosion pits and cracks are the main reasons for forming the initial fatigue crack after immersion. Moreover, the results obtained from practical work were evaluated and compared to theoretical calculations. The area of the hysteresis loops of the samples after the fatigue test, determined using Triangles and Monte Carlo methods, decreased from 4954.5 MPa and 4842.9 MPa before immersion to 192.0 MPa and 175.8 MPa after 336 h of immersion, respectively.

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