研究了轧制AZ31B镁合金在空气和NaCl溶液中的疲劳裂纹萌生情况。结果表明，在空气中，第二相开裂导致裂纹萌生；而在NaCl溶液中，点蚀或丝状腐蚀造成的表面损伤均可成为疲劳裂纹源。 NaCl溶液极大地降低了轧制AZ31B镁合金的疲劳寿命。溶液中Cl-含量越高，合金的疲劳寿命越短。
Fatigue crack initiation of rolled AZ31B magnesium alloy in air and NaCl solution was investigated. In air, the cracked second phases were responsible for crack initiation. While in NaCl solution, crack initiated from surface damage which was produced by pit corrosion or filiform corrosion. Increasing Cl- concentration, the crack initiation and propagation in NaCl solutions were enhanced and the fatigue lifetime was decreased.
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