Please wait a minute...
材料研究学报  2012, Vol. 26 Issue (5): 521-526    
  研究论文 本期目录 | 过刊浏览 |
2A12铝合金疲劳裂纹的成核与扩展机理
卞贵学1, 陈跃良2, 张勇2, 赵晨1
1.海军航空工程学院研究生管理大队 烟台 264001
2.海军航空工程学院青岛校区 青岛 266041
Microstructural Mechanism Fatigue Crack Nucleation and Propagation of 2A12 Aluminum Alloy
BIAN Guixue1,  CHEN Yueliang2,  ZHANG Yong2,   ZHAO Chen1
1.Graduate Students Team of Naval Aeronautical Engineering University, Yantai 264001
2.Qingdao Branch of Naval Aeronautical Engineering University, Qingdao 266041
引用本文:

卞贵学 陈跃良 张勇 赵晨. 2A12铝合金疲劳裂纹的成核与扩展机理[J]. 材料研究学报, 2012, 26(5): 521-526.
BIAN Guixue CHEN Yueliang ZHANG Yong ZHAO Chen. Microstructural Mechanism Fatigue Crack Nucleation and Propagation of 2A12 Aluminum Alloy[J]. Chinese Journal of Materials Research, 2012, 26(5): 521-526.

全文: PDF(1426 KB)  
摘要: 

进行了不同应力水平下和不同应力比下2A12铝合金试验件的疲劳试验, 并对试验件疲劳断口显微结构进行分析和对比, 以揭示疲劳裂纹成核与扩展的微观特征。结果表明: 2A12铝合金的疲劳裂纹在靠近试验件表面较为粗大的第二相粒子或试验件棱角缺陷处成核;成核位置距试验件表面的距离与应力水平和应力比有关, 疲劳裂纹扩展区域也与应力水平和应力比有关。应力水平较小或应力较大时, 疲劳裂纹沿晶扩展和穿晶扩展尤为明显。疲劳断口的裂纹成核粒子越小(大), 试验件疲劳寿命越短(长), 微裂纹成核寿命是疲劳全寿命计算中不可忽视的部分。

关键词 金属材料铝合金疲劳裂纹成核裂纹扩展微观结构    
Abstract

The fatigue tests were performed for 2A12 aluminum alloys specimens at various stresses and stress ratios, and the microstructure of fatigue fractography was observed by optical microscope and scanning electron microscope. The microstructure features of crack nucleation and propagation were revealed. The results show that the fatigue cracks usually initiate in the larger second phase particles near the free surfaces or the defects in corner angle of the specimen. The distance between the crack
initiation and the surface is related to stresses and stress ratios, and fatigue crack propagation zone is also related to stresses and stress ratios. The phenomenon of crack intergranular propagation and crack transgranular propagation under smaller stresses or higher stress ratios is particularly obvious. A small (large) crack-nucleating particle on fatigue fractography results in a short (long) life of specimen. Micro crack nucleation life play an important role in the calculation of holistic fatigue life.

Key wordsmetallic materials    aluminum alloy    fatigue    crack nucleation    crack propagation    microstructures
收稿日期: 2012-03-23     
ZTFLH:  TG113  
基金资助:

国家自然科学基金51075394和50675221和航空科学基金2008ZH85001资助项目。

1 M.Liao, G.Renaud, Probabilistic modeling of short crack growth in airframe aluminum alloys, Aircraft, 45, 1105(2008)

2 Lynn Eugene Oswald, Effects microstructure on high–cycle fatigue of an Al–Zn–Mg–Cu alloy(AL–7055), MS Degree (Pittsburgh, University of Pittsburgh, 2003) p.

3 Ali Merati, Graeme Eastaugh, Determination of fatigue related discontinuity state of 7000 series of aerospace aluminum alloys, Engineering Failure Analysis, 14, 673(2007)

4 Ali Merati, A study of nucleation and fatigue behavior of an aerospace aluminum alloy 2024–T3, International Journal of Fatigue, 27, 33(2005)

5 Min Liao, Probabilistic modeling of fatigue related microstructural parameters in aluminum alloys, Engineering Failure Mechanics, 76, 668(2009)

6 LI Tang, WANG Qingyuan, The microstructure and fatigue initiation of an AA2524–T34 aluminum alloy, Journal of Southwest University of Science and Technology, 24(3), 23(2009)

(李 棠, 王清远, AA2524--T34铝合金的微观结构与疲劳裂纹萌生机制, 西南科技大学学报,  24(3), 23(2009))

7 WANG Xishu, TANG Bin, TAO Sha, In–situ observation technology and application of fatigue crack initiation and propagation for cast magnesium alloys, Materials for Mechanical Engineering, 30(2), 1(2006)

(王习术, 汤 彬, 陶 沙, 铸造镁铝合金的微观破坏机理原位观测技术与应用, 机械工程材料,  30(2), 1(2006))

8 BIAN Guixue, CHEN Yueliang, YU Dazhao, Study on initial discontinuity state of LY12 aluminium alloy, Structure & Environment Engineering, 34(5), 58(2007)

(卞贵学, 陈跃良, 郁大照, LY12 铝合金初始不连续状态研究, 强度与环境,  34(5), 58(2007))

9 BIAN Guixue, CHEN Yueliang, ZHANG Danfeng, Study on fatigue life of pre–corroded aluminium alloy based on IDS, Acta Aeronau Tica et Astronautica Sinica, 29(6), 1526(2008)

(卞贵学, 陈跃良, 张丹峰, 基于IDS 的铝合金预腐蚀疲劳寿命研究, 航空学报,  29(6), 1526(2008))

10 ZHONG Qunpeng, ZHAO Zihua, ZHANG Zheng, Development of “fractography” and research of fracture micromechanism, Journal of Mechanical Strength, 27(3), 358(2005)

(钟群鹏, 赵子华, 张 峥, 断口学的发展及微观断裂机理研究, 机械强度,  27(3), 358(2005))

11 ZHONG Qunpeng, ZHAO ZiHua, Fractography (Beijing, High Education Press, 2006) p.6

(钟群鹏, 赵子华,  断口学 (北京, 高等教育出版社, 2006) p.6)

12 Derek Hull, translated by LI xiaogang, DONG Chaofang, DU Cuiwei, Fractography: Observing Measuring and Interpreting Fracture Surface Topography (Beijing, Science Press, 2009) p.9

(赫尔(Derek Hull), 李晓刚, 董超芳, 杜翠薇译, 断口形貌学: 观察、测量和分析断口形貌学的科学 (北京, 科学出版社, 2009) p.9)

13 JIAN Haigen, JIANG Feng, WEN Kang, HUANG Hongfeng, WEI Lili, JIANG Long, Fatigue fracture of 7B04 aluminum alloy under different stresses, Journal of Central South University(Science and Technology), 24(3), 23(2009)

(蹇海根, 姜 锋, 文 康, 黄宏锋, 韦莉莉, 蒋 龙, 不同应力下7B04铝合金的疲劳断口, 中南大学学报(自然科学版),  41(1), 132(2010))

14 JIAN Haigen, JIANG Feng, ZHENG Xiuyuan, Study on fatigue fractography of high strength and toughness aluminum alloy for aviation, Journal of Aeronautical Materials, 30(4), 97(2010)

(蹇海根, 姜 锋, 郑秀媛, 航空用高强高韧铝合金疲劳断口特征的研究, 航空材料学报,  30(4), 97(2010))

15 CAO Changnian, WANG Zhizhi, ZHAO Xuanmin, Evaluation and coincidence check for initial fatigue quality of fastener hole, Journal of Northwestern Polytechnical University, 1, 15(2000)

(曹昌年, 王志智, 赵选民, 紧固孔原始疲劳质量评定及符合性检查, 西北工业大学学报,  1, 15(2000))

16 HU Renwei, LIU Wenting, Advanced method of durability analysis, Journal of Beijing University of Aeronautics And Astronautics, 1, 41(1999)

(胡仁伟, 刘文珽, 结构原始疲劳质量分布方法的改进, 北京航空航天大学学报,  1, 41(1999))

[1] 毛建军, 富童, 潘虎成, 滕常青, 张伟, 谢东升, 吴璐. AlNbMoZrB系难熔高熵合金的Kr离子辐照损伤行为[J]. 材料研究学报, 2023, 37(9): 641-648.
[2] 宋莉芳, 闫佳豪, 张佃康, 薛程, 夏慧芸, 牛艳辉. 碱金属掺杂MIL125CO2 吸附性能[J]. 材料研究学报, 2023, 37(9): 649-654.
[3] 赵政翔, 廖露海, 徐芳泓, 张威, 李静媛. 超级奥氏体不锈钢24Cr-22Ni-7Mo-0.4N的热变形行为及其组织演变[J]. 材料研究学报, 2023, 37(9): 655-667.
[4] 邵鸿媚, 崔勇, 徐文迪, 张伟, 申晓毅, 翟玉春. 空心球形AlOOH的无模板水热制备和吸附性能[J]. 材料研究学报, 2023, 37(9): 675-684.
[5] 幸定琴, 涂坚, 罗森, 周志明. C含量对VCoNi中熵合金微观组织和性能的影响[J]. 材料研究学报, 2023, 37(9): 685-696.
[6] 欧阳康昕, 周达, 杨宇帆, 张磊. LPSOMg-Y-Er-Ni合金的组织和拉伸性能[J]. 材料研究学报, 2023, 37(9): 697-705.
[7] 徐利君, 郑策, 冯小辉, 黄秋燕, 李应举, 杨院生. 定向再结晶对热轧态Cu71Al18Mn11合金的组织和超弹性性能的影响[J]. 材料研究学报, 2023, 37(8): 571-580.
[8] 熊诗琪, 刘恩泽, 谭政, 宁礼奎, 佟健, 郑志, 李海英. 固溶处理对一种低偏析高温合金组织的影响[J]. 材料研究学报, 2023, 37(8): 603-613.
[9] 刘继浩, 迟宏宵, 武会宾, 马党参, 周健, 徐辉霞. 喷射成形M3高速钢热处理过程中组织的演变和硬度偏低问题[J]. 材料研究学报, 2023, 37(8): 625-632.
[10] 由宝栋, 朱明伟, 杨鹏举, 何杰. 合金相分离制备多孔金属材料的研究进展[J]. 材料研究学报, 2023, 37(8): 561-570.
[11] 任富彦, 欧阳二明. g-C3N4 改性Bi2O3 对盐酸四环素的光催化降解[J]. 材料研究学报, 2023, 37(8): 633-640.
[12] 王昊, 崔君军, 赵明久. 镍基高温合金GH3536带箔材的再结晶与晶粒长大行为[J]. 材料研究学报, 2023, 37(7): 535-542.
[13] 刘明珠, 樊娆, 张萧宇, 马泽元, 梁城洋, 曹颖, 耿仕通, 李玲. SnO2 作散射层的光阳极膜厚对量子点染料敏化太阳能电池光电性能的影响[J]. 材料研究学报, 2023, 37(7): 554-560.
[14] 秦鹤勇, 李振团, 赵光普, 张文云, 张晓敏. 固溶温度对GH4742合金力学性能及γ' 相的影响[J]. 材料研究学报, 2023, 37(7): 502-510.
[15] 刘天福, 张滨, 张均锋, 徐强, 宋竹满, 张广平. 缺口应力集中系数对TC4 ELI合金低周疲劳性能的影响[J]. 材料研究学报, 2023, 37(7): 511-522.