方杰,徐翩,刘刚,孟松,赖松柏,姜锋

• 1:中国空间技术研究院载人航天总体部
• 2:中南大学轻合金研究院
• 3:中国空间技术研究院钱学森空间技术实验室
• 4:中南大学材料科学与工程学院

摘要(Abstract)：

采用光学显微镜、扫描电镜和能谱分析等方法研究了5B70铝合金板材微观组织以及高周疲劳断口的微观特征。研究结果表明:在较低应力水平下合金主要于次表面的杂质粒子处萌生疲劳裂纹,在较高应力水平下疲劳裂纹还可由于杂质相粒子的自身开裂引发,呈现多源化趋势;影响裂纹扩展的第二相粒子主要为含Fe、Mn粒子。随着加载应力水平的提高,合金疲劳裂纹扩展区中的辉纹间距增加,二次裂纹和孔洞的数量增多。

关键词(KeyWords)： Al-Mg-Sc-Zr合金;加载应力;疲劳断口;裂纹萌生;裂纹扩展

Abstract:

Keywords:

基金项目(Foundation): 装备预先研究基金(51312030602)

作者(Author): 方杰,徐翩,刘刚,孟松,赖松柏,姜锋

DOI: 10.13289/j.issn.1009-6264.2017-0173

参考文献(References)：

• [1]Malopheyev S,Kulitskiy V,Mironov S,et al.Friction-stir welding of an Al-Mg-Sc-Zr alloy in as-fabricated and work-hardened conditions[J].Materials Science and Engineering A,2014,600:159-170.
• [2]杜会桥,侯文德,姜坤,等.Al-Mg-Sc型铝合金5B70热裂纹敏感性评估[J].焊接技术,2012,41(12):45-48.DU Hui-qiao,HOU Wen-de,JIANG Kun,et al.Hot cracking sensitivity evaluation of 5B70 Al-Mg-Sc aluminum alloy[J].Welding Technology,2012,41(12):445-48.
• [3]Smirnov A S,Konovalov A V,Pushin V G,et al.Peculiarities of the rheological behavior for the Al-Mg-Sc-Zr alloy under high-temperature deformation[J].Journal of Materials Engineering and Performance,2014,23(12):4271-4277.
• [4]聂波,尹志民,姜锋,等.稳定化退火工艺对铝镁钪合金力学和腐蚀性能的影响[J].材料热处理学报,2008,29(3):58-61.NIE Bo,YIN Zhi-min,JIANG Feng,et al.Influence of stabilizing annealing on tensile property and exfoliation corrosion resistance of Al-Mg-Sc alloy[J].Transactions of Materials and Heat Treatment,2008,29(3):58-61
• [5]Kulitskiy V,Malopheyev S,Mironov S,et al.Grain refinement in an Al-Mg-Sc alloy:Equal channel angular pressing versus friction-stir processing[J].Materials Science and Engineering A,2016,674:480-490.
• [6]杜刚,杨文,闫德胜,等.铸态Al-Mg-Sc-Zr合金退火过程中的硬化行为[J].金属学报,2011,47(3):311-316.DU Gang,YANG Wen,YAN De-sheng,et al.Hardening behavior of the as-cast Al-Mg-Sc-Zr alloy[J].Acta Metallurgica Sinica,2011,47(3):311-316.
• [7]Kumar N,Mishra R S.Additivity of strengthening mechanisms in ultrafine grained Al-Mg-Sc alloy[J].Materials Science and Engineering A,2013,580(37):175-183.
• [8]Smolej A,Klob Ar D,Skaza B,et al.Superplasticity of the rolled and friction stir processed Al-4.5 Mg-0.35Sc-0.15Zr alloy[J].Materials Science and Engineering A,2014,590(1):239-245.
• [9]孙雪,潘清林,李梦佳,等.Al-Mg-Sc-Zr合金冷轧板材的超塑性变形行为[J].中国有色金属学报,2016,26(02):280-287.SUN Xue,PAN Qing-lin,LI Meng-jia,et al.Superplastic deformation behavior of cold-rolled Al-Mg-Sc-Zr alloy sheet[J].The Chinese Journal of Nonferrous Metals,2016,26(02):280-287.
• [10]Pao P S,Holtz R L,Jones H N,et al.Effect of environment on fatigue crack growth in ultrafine grain Al-Mg[J].International Journal of Fatigue,2009,31(11/12):1678-1683.
• [11]王燕,黄晖,高坤元,等.冷轧5E06和5E83铝合金板的疲劳断裂行为研究[J].稀有金属,2011,35(06):791-798.WANG Yan,HUANG Hui,GAO Kun-yuan,et al.Fatigue fracture behavior of cold rolled 5E06 and 5E83 aluminum alloy plate[J].Chinese Journal of Rare Metals,2011,35(06):791-798.
• [12]张志军,黄晖,王为,等.铒对Al-4.7Mg-0.7Mn-0.1Zr合金疲劳强度的影响[J].稀有金属,2009,33(5):611-615.ZHANG Zhi-jun,HUANG Hui,WANG Wei,et al.Influence of erbium on fatigue behavior of Al-4.7Mg-0.7Mn-0.4Er-0.1Zr alloy[J].Chinese Journal of Rare Metals,2009,33(5):611-615.
• [13]Lei X,Huang H,Wang H.The fatigue crack propagation of Al-Mg-Mn-Zr alloy with erbium[J].Advanced Materials Research,2015,1120-1121:1083-1088.
• [14]Fuller C B,Krause A R,Dunand D C,et al.Microstructure and mechanical properties of a 5754 aluminum alloy modified by Sc and Zr additions[J].Materials Science and Engineering A,2002,338(1/2):8-16.
• [15]高镇同.疲劳可靠性[M].北京:北京航空航天大学出版社,2000.
• [16]Bai S,Liu Z,Gu Y,et al.Microstructures and fatigue fracture behavior of an Al-Cu-Mg-Ag alloy with a low Cu/Mg ratio[J].Materials Science and Engineering A,2011,530:473-480.
• [17]陈梦成,张安哥,朱成九.疲劳、断裂与损伤[M].成都:西南交通大学出版社,2006.
• [18]王习术,梁锋,曾燕屏,等.夹杂物对超高强度钢低周疲劳裂纹萌生及扩展影响的原位观测[J].金属学报,2005,41(12):1272-1276.WANG Xi-shu,LIANG Feng,ZENG Yan-ping,et al.SEM in situ observations to the effects of inclusions on initiation and propagation of the low cyclic fatigue crack in super strength steel[J].Acta Metallurgica Sinica,2005,41(12):1272-1276.
• [19]郑子樵,陈圆圆,钟利萍,等.2524-T34合金疲劳裂纹的萌生和扩展行为[J].中国有色金属学报,2010,20(1):37-42.ZHENG Zi-qiao,CHEN Yuan-yuan,ZHONG Li-ping,et al.Initiation and propagation behavior of fatigue crack in 2524-T34 alloy[J].The Chinese Journal of Nonferrous Metals,2010,20(1):37-42.

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