热处理对挤压变形Mg-7%Zn-0.6%Zr-0.5%Y合金低周疲劳行为的影响*
收稿日期: 2013-12-02
修回日期: 2014-03-31
网络出版日期: 2014-06-20
INFLUENCE OF HEAT TREATMENT ON LOW-CYCLE FATIGUE BEHAVIOR OF EXTRUDED Mg-7%Zn-0.6%Zr-0.5%Y ALLOY
Received date: 2013-12-02
Revised date: 2014-03-31
Online published: 2014-06-20
对热挤压、时效处理(T5态)及固溶+时效处理(T6态) Mg-7%Zn-0.6%Zr-0.5%Y合金(质量分数)分别进行了低周疲劳实验, 探讨了热处理对合金低周疲劳变形行为的影响. 结果表明: 时效处理和固溶+时效处理可提高热挤压Mg-7%Zn-0.6%Zr-0.5%Y合金的循环变形抗力; 时效处理降低了合金的疲劳寿命, 固溶+时效处理可以提高合金在较高外加总应变幅下的疲劳寿命, 但降低合金在较低外加总应变幅下的低周疲劳寿命; 不同状态合金的弹性应变幅和塑性应变幅与载荷反向周次的关系可分别用Basquin和Coffin-Manson公式来描述; 时效及固溶+时效处理过程中形成的长周期堆垛有序结构(LPSO相)是合金的循环变形抗力大幅提高的主要原因, 而疲劳变形过程中形成的孪晶可能是时效态合金疲劳寿命降低的原因.
张思倩 , 吴伟 , 陈丽丽 , 车欣 , 陈立佳 . 热处理对挤压变形Mg-7%Zn-0.6%Zr-0.5%Y合金低周疲劳行为的影响*[J]. 金属学报, 2014 , 50(6) : 700 -706 . DOI: 10.3724/SP.J.1037.2013.00781
The low-cycle fatigue tests have been conducted for the Mg-7%Zn-0.6%Zr-0.5%Y alloys (mass fraction) subjected to extrusion, aging (T5) and solution plus aging (T6) treatment, respectively. The influence of heat treatment on the fatigue deformation behavior of the alloy has also been systematically investigated. The results show that T5 and T6 treatment can improve the cyclic deformation resistance of Mg-7%Zn-0.6%Zr-0.5%Y alloys. T5 treatment can reduce the fatigue life of the alloy. However, T6 treatment can improve the fatigue life at high total strain amplitudes, and reduce the fatigue life at low total strain amplitudes. The relationship between elastic strain amplitude, plastic strain amplitude and reversals to failure of the alloys can be described by Basquin and Coffin-Manson equations, respectively. For the alloys subjected to both T5 and T6 treatments, the increase in the cyclic deformation resistance is mainly due to the formation of long period stacking ordered (LPSO) phase. The twins formed during the fatigue deformation may be responsible for the decrease in the fatigue life of the alloy subjected to T5 treatment.
Key words： magnesium alloy; low-cycle fatigue; cyclic deformation; heat treatment
| [1] | Avedsain M M, Baker H. Magnesium and Magnesium Alloys. Materials Park, Ohio: ASM International, 1999: 7 |
| [2] | Polmear I J. Mater Sci Technol, 1994; 10: 1 |
| [3] | Nishikawa Y. Funct Mater, 1999; 19(6): 21 |
| [4] | Horikir H, Kato A, Inoue A, Masumoto T. Mater Sci Eng, 1994; A179: 702 |
| [5] | Lee S, Lee S H, Kim D H. Metall Mater Trans, 1998; 29A: 1221 |
| [6] | Payne R J M, Bailey N. J Inst Met, 1960; 88: 417 |
| [7] | Unsworth W. Int J Mater Prod Technol, 1989; 4: 1359 |
| [8] | Drits M E, Sviderkaya Z A, Rokhlin L L, Nikitina N I. Met Sci Heat Treat, 1979; 21: 887 |
| [9] | Zhao H D, Qin G W, Ren Y P, Pei W L, Chen D, Guo Y. J Alloys Compd,?2011; 509: 627 |
| [10] | Wang J, Zhang D P, Fang D Q, Lu H Y, Tang D X, Zhang J H, Meng J. J Alloys Compd,?2008; 454: 194 |
| [11] | Luo S Q, Tang A T, Pan F S, Song K, Wang W Q. Trans Nonferrous Met Soc China,?2011; 21: 795 |
| [12] | Xu D K, Tang W N, Liu L, Xu Y B, Han E H. J Alloys Compd,?2007; 432: 129 |
| [13] | Coffin L F. Trans Am Soc Mech Eng, 1954; 76: 931 |
| [14] | Coffin L F. Met Trans, 1972; 3: 1777 |
| [15] | Basquin O H. Proc Am Soc Test Mater, 1990; 10: 626 |
| [16] | Suresh S, translated by Wang Z G. Fatigue of Materials. Beijing: National?Defence?Industry?Press, 1999: 158 |
| [16] | (Suresh S 著,王中光 译. 材料的疲劳. 北京: 国防工业出版社, 1999: 158) |
| [17] | Eliezer A, Gutman E M, Abramov E, Unigovski Y. J Light Met, 2001; 1: 179 |
| [18] | Hilpert M, Wagner L. J Mater Eng Perform, 2000; 9: 402 |
| [19] | Xu D K, Liu L, Xu Y B, Han E H. J Alloys Compd,?2008; 454: 123 |
| [20] | Kawamura Y, Hayashi K, Inoue A, Masumoto T. Metall Trans, 2001; 42: 1172 |
| [21] | Jiang L, Jonas J J, Mishra R K, Luo A A, Sachdev A K, Godet S. Acta Mater, 2007; 55: 3899 |
| [22] | Kawamura Y, Hayashi K, Inoue A, Masumoto T. Mater Trans, 2001; 42: 1172 |
| [23] | Hagihara K, Yokotani N, Umakoshi Y. Intermetallics, 2010; 18: 267 |
| [24] | Yang X, Miura H, Sakai T. Mater Trans, 2003; 44: 197 |
| [25] | Tome C N, Agnew S R, Blumenthal W R, Bourke M A M, Kaschner G C, Rangaswamy P. Mater Sci Forum, 2003; 408-412: 263 |
| [26] | Christian J W, Mahajant S. Prog Mater Sci, 1995; 39: 1 |
| [27] | Jiang L, Jonas J J, Luo A A, Sachdev A K, Godet S. Mater Sci Eng, 2007; 445-446: 302 |
| [28] | Jain A, Duygulu O, Brown D W, Tome C N, Agnew S R. Mater Sci Eng, 2008; 486: 545 |
/
| 〈 |
|
〉 |
