Low Cycle Fatigue Behavior of Al-Zn-Mg-Cu Alloy Containing Zr and Sc

被引：0
|
作者：
Zhang X. [1 ,2 ]
Leng L. [3 ]
Wang Z. [2 ]
机构：
[1] School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing
[2] Beijing Research Institute of Mechanical & Electrical Technology, Beijing
[3] School of Material Science and Engineering, Shenyang University of Technology, Shenyang
来源：
| 1600年 / Cailiao Daobaoshe/ Materials Review卷 / 31期
关键词：
Al-Zn-Mg-Cu; Low cycle fatigue; Sc; Zr;
D O I：
10.11896/j.issn.1005-023X.2017.020.014
中图分类号：
学科分类号：
摘要：
The single stage aging and RRA treatment on both microstructure and fatigue properties of Al-Zn-Mg-Cu alloy with Zr and Sc content were investigated through the transmission electron microscope and the low-cycle fatigue tests. In the single aging treatment state, the major precipitates inside the grains are η' phases, the discontinuous equilibrium phase precipitates at the grain boundaries, and there exist the precipitate free zones near the grain boundaries. For the alloy subject to RRA treatment state, the precipitates both inside the grains and at the grain boundaries obviously grow, and the precipitate free zone widens. Under the low-cycle fatigue loading condition, the alloy with different heat treatment states exhibits mainly the stable cyclic stress response behavior at the total strain amplitudes ranged from 0.4% to 0.7%. However, at the total strain amplitude of 0.8%, the alloy shows mostly the cyclic strain softening followed by the cyclic strain hardening. At the total strain amplitudes from 0.4% to 0.6%, the RRA treatment can effectively prolong the low-cycle fatigue lives of the alloy. The relationships between the plastic strain amplitude, elastic strain amplitude and reversals to failure are linear, and can be described separately with the Coffin-Manson formula and Basquin equations. In addition, the fatigue cracks initiate transgranularly at the free surface of fatigue samples and propagate transgranularly. © 2017, Materials Review Magazine. All right reserved.
引用
收藏
页码：63 / 67
页数：4
相关论文
共 14 条
  • [1] Dursun T., Soutis C., Recent developments in advanced aircraft aluminum alloys, Mater Des, 56, (2014)
  • [2] Gonzalo B., Jorge R.G., Jose M., Recent developments in advanced aircraft aluminum alloys, J Mater Eng Perform, 18, (2009)
  • [3] Senkov O.N., Shagiev M.R., Senkova S.V., Et al., Precipitation of Al<sub>3</sub>-(Sc, Zr) particles in an Al-Zn-Mg-Cu-Sc-Zr alloy during conventional solution heat treatment and its effect on tensile properties, Acta Mater, 56, 15, (2008)
  • [4] Zhang W., Xing Y., Jia Z.H., Et al., Effect of minor Sc and Zr addition on the microstructure and properties of ultra-high strength alloy, Trans Nonferrous Metals Soc China, 24, (2014)
  • [5] Dezecot S., Brochu M., Microstructural characterization and high cycle fatigue behavior of invesment cast A357 aluminum alloy, Int J Fatigue, 77, (2015)
  • [6] Zupanc U., Grum J., Effect of pitting corrosion on fatigue perfor-mance of shot-peened aluminium alloy 7075-T651, J Mater Processing Technol, 210, (2010)
  • [7] Han S.W., Katsumata K., Kumai S., Et al., Effects of solidification structure and aging condition on cuclic stress-strain response in Al-7%Si-0. 4%Mg cast alloys, Mater Sci Eng A, 337, 1-2, (2002)
  • [8] Michael D.S., Hans J.M., Huseyin S., Aphysically based fatigue mo-del for predicition of crack iniation form persistent slip bands in polycrystals, Acta Mater, 59, 1, (2011)
  • [9] Miao J., Pollock T.M., Jones J.W., Microstructural extremes and the transition from fatigue crack initiation to small crack growth in a polycrystalline nickel-base superalloy, Acta Mater, 60, 6-7, (2012)
  • [10] Kim S.W., Han S.W., Lee U.J., Et al., Effect of solidication structure on fatigue crack growth in rheocast and thixocast Al-Mg-Si alloys, Mater Lett, 58, 1-2, (2004)
12