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周松,胡馨月,安金岚,许良,王磊.不同标印工艺对2A70铝合金的高周疲劳性能的影响[J].稀有金属材料与工程(英文),2021,50(5):1833~1839.[zhousong,huxinyue,anjinlan,xuliang and wanglei.Effect of Different Marking Processes on High Cycle Fatigue Performance of 2A70 Aluminum Alloy[J].Rare Metal Materials and Engineering,2021,50(5):1833~1839.]
Effect of Different Marking Processes on High Cycle Fatigue Performance of 2A70 Aluminum Alloy
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Received:July 08, 2020  
DOI:
Key words: High cycle fatigue  2A70 aluminum alloy  stress concentration  precipitation phase
Foundation item:国家自然科学基金(51775355);沈阳航空航天大学青年博士科研启动基金(18YB55)
Author NameAffiliation
zhousong,huxinyue,anjinlan,xuliang and wanglei  
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Abstract:
      The high cycle fatigue performance and fracture mechanism of 2A70 aluminum alloy after laser and vibration marking were studied.The results showed that compared with the base material, the high cycle fatigue life of 2A70 alloy after vibration marking decreased by 57% and that of laser marking decreased by 94%, which was only 14% of the fatigue life of vibration marking.Compared with laser marking, the topography near vibration marking is more gentle, the stress concentration degree is smaller, the S "phase size is smaller and the volume fraction is higher.Al9FeNi phase has smaller size, higher volume fraction, lower crack initiation and propagation rate, and longer fatigue life.The high cycle fatigue performance of 2A70 aluminum alloy under vibration marking is much better than that under laser marking due to the joint action of stress concentration, precipitation phase size and volume fraction.S