不同标印工艺对2A70铝合金的高周疲劳性能影响  

Effect of Different Marking Processes on High Cycle Fatigue Performance of 2A70 Aluminum Alloy

作　　者：周松 胡馨月 安金岚 许良 王磊 Zhou Song;Hu Xinyue;An Jinlan;Xu Liang;Wang Lei(School of Mechanical and Electrical Engineering,Shenyang Aerospace University,Shenyang 110136,China;Key Laboratory of Fundamental Science for National Defense of Aeronautical Digital Manufacturing Process,Shenyang 110136,China)

机构地区：[1]沈阳航空航天大学机电工程学院,辽宁沈阳110136 [2]航空制造工艺数字化国防重点学科实验室,辽宁沈阳110136

出　　处：《稀有金属材料与工程》2021年第5期1833-1839,共7页Rare Metal Materials and Engineering

基　　金：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)。

摘　　要：研究了2A70铝合金在激光标印、振动标印后的高周疲劳性能及断裂机理。结果表明,与母材相比,振动标印后2A70铝合金高周中值疲劳寿命下降了67%,而激光标印后下降了95%,仅是振动标印中值疲劳寿命的16%;与激光标印相比,振动标印附近的形貌更为平缓,应力集中程度更小,S’相尺寸更小,体积分数更高。Al9Fe Ni相尺寸更小,体积分数更高,裂纹萌生、扩展速率更低,疲劳寿命更长;应力集中的程度和析出相尺寸、体积分数的共同作用,导致振动标印下的2A70铝合金高周疲劳性能远远优于激光标印。The high cycle fatigue properties and fracture mechanism of 2 A70 aluminum alloy after laser and vibration marking were studied.The results show that compared with the base material,the median fatigue life of 2 A70 alloy after vibration marking decreases by67%and that after laser marking decreases by 95%,which is only 16%of that of 2 A70 alloy after vibration marking.In contrast,the morphology near vibration marking is more gentle,the stress concentration degree is smaller,the size of S’phase is smaller,the volume fraction is higher,the size of Al9 FeNi phase is smaller,the volume fraction is higher,the crack initiation and propagation rate is lower,and the fatigue life is longer.The high cycle fatigue performance of 2 A70 aluminum alloy after vibration marking is much better than that after laser marking due to the joint action of stress concentration,precipitation phase size and volume fraction.

关 键 词：高周疲劳 2A70铝合金 应力集中 析出相 

分 类 号：TG115[金属学及工艺—物理冶金] TG146.21[金属学及工艺—金属学]