沉积颗粒对7N01-T6铝合金疲劳裂纹扩展行为的影响

doi:10.11896/cldb.18030191

材料导报

2019, Vol. 33

Issue (10): 1697-1701 https://doi.org/10.11896/cldb.18030191

金属与金属基复合材料

沉积颗粒对7N01-T6铝合金疲劳裂纹扩展行为的影响

陈宇强¹, 宋文炜¹, 潘素平², 刘文辉^1,3, 宋宇锋^1,3, 张浩^1,3

1 湖南科技大学机电工程学院,湘潭 411201
2 中南大学高等研究中心,长沙 410083
3 湖南科技大学高温耐磨材料及制备技术湖南省国防技术重点实验室,湘潭 411201

The Effects of Deposited Particles on the Fatigue Crack Growth Behavior of 7N01-T6 Aluminum Alloy

CHEN Yuqiang¹, SONG Wenwei¹, PAN Suping², LIU Wenhui^1,3, SONG Yufeng^1,3, ZHANG Hao^1,3

1 School of Mechanicl Engineering, Hunan University of Science and Technology, Xiangtan 411201
2 Advanced Research Center, Central South University, Changsha 410083
3 Hunan Provincial Key Defense Laboratory of High Temperature Wear-resisting Materials and Preparation Technology, Hunan University of Science and Technology, Xiangtan 411201

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摘要利用自主设计的实验方法,结合疲劳裂纹扩展速率测试以及断口微观形貌观察研究了R=0.1和R=0.5两种应力比下,石墨和氧化铝沉积颗粒对7N01-T6铝合金疲劳裂纹扩展行为的影响。结果表明:在两种应力比条件下,裂纹扩展Ⅰ、Ⅱ阶段中,合金在石墨颗粒环境下的疲劳裂纹扩展速率均最快。当R=0.5时,在裂纹扩展Ⅰ、Ⅱ阶段,合金在氧化铝颗粒环境下的疲劳裂纹扩展速率最慢。当R=0.1时,在应力强度因子ΔK<15 MPa·m^1/2阶段,合金在氧化铝颗粒环境下的疲劳裂纹扩展速率最慢,在ΔK=15~30 MPa·m^1/2阶段,合金在氧化铝颗粒环境和大气环境下的疲劳裂纹扩展速率相当。石墨颗粒环境下合金疲劳裂纹扩展速率的增加是由于石墨颗粒的润滑作用降低了疲劳卸载过程中的裂纹闭合效应。氧化铝颗粒环境下合金疲劳裂纹扩展速率的降低是由于氧化铝颗粒在断面的沉积增强了疲劳卸载过程中的裂纹闭合效应。

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关键词: 沉积颗粒铝合金疲劳裂纹扩展应力比微观组织

Abstract: The influences of graphite and alumina deposited particles on the fatigue crack propagation behavior of 7N01-T6 aluminum alloy at R=0.1 and R=0.5 were investigated by using a self-designed experimental method and combined with fatigue crack growth rate test and fracture morphology observation. The results show that the fatigue crack growth rate of the alloy in the graphite particle environment is the fastest under both stress ratio conditions in the crack growth stage Ⅰ and Ⅱ. When the R is 0.5, the fatigue crack growth rate of the alloy in the alumina particle environment is the slowest in the crack growth stage Ⅰ and Ⅱ. When the R is 0.1, ΔK<15 MPa·m^1/2, the fatigue crack growth rate of the alloy in the alumina particle environment is the slowest. When the ΔK in the range from 15 MPa·m^1/2 to 30 MPa·m^1/2, the fatigue crack growth rate of the alloy in the alumina particle environment and atmospheric environment is quite similar. The increase of fatigue crack growth rate in graphite particle environment is due to the lubricated by graphite particles. It reduces the effect of crack closure during unloading. The decrease of the fatigue crack propagation rate in the alumina particle environment is due to the deposition of alumina particles on the fracture surface enhances the crack closure level during unloading.

Key words: deposited particles aluminum alloy fatigue crack growth stress ratio microstructure

发布日期: 2019-05-16

ZTFLH:

TG146.2

基金资助: 国家自然科学基金(51405153;51475162)

通讯作者: yqchen1984@163.com

作者简介: 陈宇强,男,博士,副教授,湖南科技大学材料成型与控制工程系副主任,主要研究方向为铝合金加工工艺与性能、损伤机理以及微结构表征。入选湖南省青年骨干教师、湖南省科技创新创业菁英培育计划。主持国家自然科学基金,湖南省创新创业技术投资专项,湘潭市科技创新“四个十”重大科技专项,校企合作科研项目,产学研成果转化项目等科研项目7项,获得湖南省自然科学奖三等奖一项,在Materials Science and Engineering A、Journal of Alloys and Compounds等学术刊物发表学术论文40余篇,获得授权专利10余项,软件注册权8项,担任Journal of Alloys and Compounds、Micro & Nano Letters、《稀有金属材料与工程》等期刊审稿人。

引用本文:

陈宇强, 宋文炜, 潘素平, 刘文辉, 宋宇锋, 张浩. 沉积颗粒对7N01-T6铝合金疲劳裂纹扩展行为的影响[J]. 材料导报, 2019, 33(10): 1697-1701.
CHEN Yuqiang, SONG Wenwei, PAN Suping, LIU Wenhui, SONG Yufeng, ZHANG Hao. The Effects of Deposited Particles on the Fatigue Crack Growth Behavior of 7N01-T6 Aluminum Alloy. Materials Reports, 2019, 33(10): 1697-1701.

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http://www.mater-rep.com/CN/10.11896/cldb.18030191 或 http://www.mater-rep.com/CN/Y2019/V33/I10/1697

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