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中文摘要：
通过疲劳试验、扫描电子显微镜（SEM）等手段，研究挤压态镁合金AZ31在空气ω（NaCl，Na2SO4）=3．5％ 2种溶液中的疲劳行为。结果表明，合金在两种腐蚀介质下的疲劳性能明显下降，分别为58．91％和34．40％。腐蚀介质下，疲劳裂纹萌生机制的改变是镁合金疲劳性能下降的主要原因。Cl^-穿透能力强，易形成点蚀坑，成为最佳萌生源。相比之下，Na2SO4溶液中的腐蚀类型改变和危害性也较小。
英文摘要：
The fatigue behavior of extruded AZ31 magnesium alloy in air,ω（NaCl, Na2SO4= 3.5%） solutions was studied by using fatigue test and scanning electron microsropg. The fatigue properties of AZ31 magnesium alloy in the two corrosive encironments were reduced by 58.91% and 34.40% ,respectively. In the corrosive environments,the change of the fatigue crack initiation mechanism is the main reason for the reduction of fatigue properties. CI^- has strong penetration capacity and is easy to form corrosion pits on the specimen surface,which become the best crack initiation source. Comparatively,the corrosion type change in Na2SO4 solution and the harmful-ness are smaller.
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