预变形对AZ31B镁合金循环变形和疲劳行为的影响
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摘要
通过小应变幅值预循环变形和预压缩变形对挤压态AZ31B合金分别引入了大量位错和孪晶,研究了预变形对AZ31B合金单向变形行为、循环变形行为和疲劳寿命的影响。结果表明:预循环变形能提高单向拉伸屈服强度,对大应变幅值下的疲劳性能几乎没有影响,但在小应变幅值下出现明显的硬化现象,疲劳性能明显下降。预压缩降低了单向拉伸屈服强度,对大应变幅值下的疲劳性能无显著影响,而在小应变幅值下会增大塑性应变能密度,减少疲劳寿命。
A large number of dislocations and twins were introduced into extruded AZ31B alloys by precyclic predeformation with small strain amplitude and precompression deformation, respectively. The effects of predeformation on unidirectional deformation behavior, cyclic deformation behavior and fatigue life of AZ31B alloy were studied. The results show that cyclic predeformation can improve the uniaxial tensile yield strength, and it has little effect on the fatigue performance at large strain amplitude. But under small strain amplitude, the phenomenon of hardening appears obviously, and the fatigue property decreases obviously. Precompression reduces the uniaxial tensile yield strength and has no significant effect on the fatigue performance at large strain amplitude, but it increases the plastic strain energy density and reduces the fatigue life at small strain amplitude.
A large number of dislocations and twins were introduced into extruded AZ31B alloys by precyclic predeformation with small strain amplitude and precompression deformation, respectively. The effects of predeformation on unidirectional deformation behavior, cyclic deformation behavior and fatigue life of AZ31B alloy were studied. The results show that cyclic predeformation can improve the uniaxial tensile yield strength, and it has little effect on the fatigue performance at large strain amplitude. But under small strain amplitude, the phenomenon of hardening appears obviously, and the fatigue property decreases obviously. Precompression reduces the uniaxial tensile yield strength and has no significant effect on the fatigue performance at large strain amplitude, but it increases the plastic strain energy density and reduces the fatigue life at small strain amplitude.
引文
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[16]Xu D K,Han E H.Relationship between fatigue crack initiation and activated twins in as-extruded pure magnesium[J].Scripta Materialia,2013,69(9):702-705.
[17]Xiong Y,Jiang Y.Cyclic deformation and fatigue of rolled AZ80 magnesium alloy along different material orientations[J].Materials Science and Engineering A,2016,677:58-67.
[18]Matsuzuki M,Horibe S.Analysis of fatigue damage process in magnesium alloy AZ31[J].Materials Science and Engineering A,2009,504(1/2):169-174.
[19]Xiong Y,Yu Q,Jiang Y.Cyclic deformation and fatigue of extruded AZ31B magnesium alloy under different strain ratios[J].Materials Science and Engineering A,2016,649:93-103.
[20]Lachowicz C T.Calculation of the elastic-plastic strain energy density under cyclic and random loading[J].International Journal of Fatigue,2001,23(7):643-652.
[21]Jahed H,Albinmousa J.Multiaxial behaviour of wrought magnesium alloys-a review and suitability of energy-based fatigue life model[J].Theoretical and Applied Fracture Mechanics,2014,73:97-108.
[2]嵇文青.变形镁合金低周疲劳行为研究[D].南京:南京理工大学,2013.
[3]You S,Huang Y,Kainer K U,et al.Recent research and developments on wrought magnesium alloys[J].Journal of Magnesium and Alloys,2017,5(3):239-253.
[4]陈振华.变形镁合金[M].北京:化学工业出版社,2005.
[5]Yue Y,Dai L Y,Zhong H,et al.Effect of microstructure on high cycle fatigue behavior of Ti-20Zr-6.5Al-4V alloy[J].Journal of Alloys and Compounds,2017,696:663-669.
[6]张宏,唐亚新,余承业,等.激光冲击处理对2024铝合金疲劳性能的影响[J].金属热处理学报,1999,20(2):57-62.
[7]高洪涛,吴国华,丁文江.镁合金疲劳性能的研究现状[J].铸造技术,2003(4):266-268.
[8]Eisenmeier G,Holzwarth B,H觟ppel H W,et al.Cyclic deformation and fatigue behaviour of the magnesium alloy AZ91[J].Materials Science and Engineering A,2001:578-582.
[9]Wang C,Xin R,Li D,et al.Enhancing the age-hardening response of rolled AZ80 alloy by pre-twinning deformation[J].Materials Science and Engineering A,2017,680:152-156.
[10]唐诗黛,赵怀智,赵锦志,等.利用预变形改善镁合金板材延展成形性能的研究进展[J].热加工工艺,2016,45(15):15-19.
[11]王小蒙.预循环变形对不同取向铜单晶体单向力学性能的影响[D].沈阳:东北大学,2011.
[12]Huang G,Li J,Han T,et al.Improving low-cycle fatigue properties of rolled AZ31 magnesium alloy by pre-compression deformation[J].Materials&Design,2014,58:439-444.
[13]Wen B,Wang F,Jin L,et al.Fatigue damage development in extruded Mg-3Al-Zn magnesium alloy[J].Materials Science and Engineering A,2016,667:171-178.
[14]温北恺.挤压态AZ31B镁合金低周疲劳损伤行为研究[D].上海:上海交通大学,2016.
[15]Yu Q,Zhang J,Jiang Y,et al.An experimental study on cyclic deformation and fatigue of extruded ZK60 magnesium alloy[J].International Journal of Fatigue,2012,36(1):47-58.
[16]Xu D K,Han E H.Relationship between fatigue crack initiation and activated twins in as-extruded pure magnesium[J].Scripta Materialia,2013,69(9):702-705.
[17]Xiong Y,Jiang Y.Cyclic deformation and fatigue of rolled AZ80 magnesium alloy along different material orientations[J].Materials Science and Engineering A,2016,677:58-67.
[18]Matsuzuki M,Horibe S.Analysis of fatigue damage process in magnesium alloy AZ31[J].Materials Science and Engineering A,2009,504(1/2):169-174.
[19]Xiong Y,Yu Q,Jiang Y.Cyclic deformation and fatigue of extruded AZ31B magnesium alloy under different strain ratios[J].Materials Science and Engineering A,2016,649:93-103.
[20]Lachowicz C T.Calculation of the elastic-plastic strain energy density under cyclic and random loading[J].International Journal of Fatigue,2001,23(7):643-652.
[21]Jahed H,Albinmousa J.Multiaxial behaviour of wrought magnesium alloys-a review and suitability of energy-based fatigue life model[J].Theoretical and Applied Fracture Mechanics,2014,73:97-108.