Cyclic shear deformation and fatigue of extruded Mg-Gd-Y magnesium alloy

doi:10.1016/j.jmst.2019.08.025

材料科学与技术 ›› 2020, Vol. 39 ›› Issue (0): 74-81.DOI: 10.1016/j.jmst.2019.08.025

收稿日期:2019-06-18 修回日期:2019-08-01 接受日期:2019-08-12 出版日期:2020-02-15 发布日期:2020-03-11

Cyclic shear deformation and fatigue of extruded Mg-Gd-Y magnesium alloy

Fenghua Wang^a^d, Miaolin Feng^b, Yanyao Jiang^c, Jie Dong^a^*(), Zhenyan Zhang^a^d

^a National Engineering Research Center of Light Alloy Net Forming & State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240, China
^b Department of Engineering Mechanics, Shanghai Jiao Tong University, Shanghai, 200240, China
^c Department of Mechanical Engineering, University of Nevada, Reno, NV, 89557, USA
^d Shanghai Light Alloy Net Forming National Engineering Research Center Co. Ltd, Shanghai, 201615, China

Received:2019-06-18 Revised:2019-08-01 Accepted:2019-08-12 Online:2020-02-15 Published:2020-03-11
Contact: Dong Jie

摘要/Abstract

Abstract:

Deformation and fatigue of extruded Mg-8.0Gd-3.0Y-0.5Zr (GW83, wt%) magnesium (Mg) alloy were experimentally investigated under cyclic torsion using tubular specimen fabricated along the extrusion direction. The controlled shear strain amplitudes ranged from 0.606% to 4.157%. Twinning and detwinning of extension twins are observed to take place during cyclic torsion and the shear stress-shear strain hysteresis loops display a perfectly symmetric shape at all tested strain amplitudes. Marginal cyclic softening is observed when the shear strain amplitude is higher than 1.732%. The strain-life fatigue curve shows two kink points, corresponding to the shear strain amplitude of 1.040% and 1.732%, respectively. When the shear strain amplitude is higher than the upper kink point, early fatigue crack is found to initiate on the maximum shear plane. When the strain amplitude is lower than the lower kink point, fatigue cracking is parallel to the maximum tensile plane. At an identical equivalent strain amplitude, the fatigue life under pure shear is much higher than that under tension-compression. The fatigue life of extruded GW83 alloy is much higher than that of extruded AZ31B alloy at the same plastic strain energy density.

Key words: Mg-Gd-Y-Zr magnesium alloy, Cyclic torsion, Shear fatigue, Twinning

. [J]. 材料科学与技术, 2020, 39(0): 74-81.

Fenghua Wang, Miaolin Feng, Yanyao Jiang, Jie Dong, Zhenyan Zhang. Cyclic shear deformation and fatigue of extruded Mg-Gd-Y magnesium alloy[J]. J. Mater. Sci. Technol., 2020, 39(0): 74-81.

图/表 11

Fig. 1. Initial microstructure and texture of extruded GW83 alloys: (a) three-dimensional microstructure, (b) (0002) and {10-10} pole figures on the RD-TD plane.

Fig. 2. Shear stress-shear strain curve of extruded GW83 alloy.

Fig. 3. Shear stress-shear strain hysteresis loops of extruded GW83 alloy: (a) Δγ/2 = 2.078%; (b) Δγ/2 = 1.472%; (c) Δγ/2 = 0.693%.

Fig. 4. Variation of shear stress amplitude with number of loading cycles under shear strain amplitudes from 0.606% to 2.425% for extruded GW83 alloy.

Fig. 5. Stabilized shear stress-shear strain hysteresis loops at half-life cycles.

Table 1 Shear fatigue results for extruded GW83 alloy obtained from free end torsion experiments.

Spec ID	Δγ/2 (%)	Δε_eq/2 (%)	Δτ/2 (MPa)	τm (MPa)	ΔWp (MJ/m³)	Nf
83IITU30	4.157	2.4	135.8	0.42	--	39
83IITU35	2.915	1.68	128.3	0.34	--	78
83IITU23	2.425	1.4	123.5	0.42	4.389	175
83IITU36	2.078	1.2	119.2	0.46	3.233	382
83IITU27	1.905	1.1	116.7	0.21	2.714	583
83IITU17	1.732	1.0	110.9	0.17	2.060	2,275
83IITU28	1.472	0.85	99.9	0.12	1.396	5,083
83IITU22	1.212	0.7	97.1	-0.05	0.916	14,700
83IITU20	1.040	0.6	93.2	0.35	0.680	27,780
83IITU21	0.866	0.5	92.3	0.71	0.400	47,000
83IITU18	0.693	0.4	83.9	0.22	0.213	149,653
83IITU31	0.606	0.35	79.2	-1.04	0.105	630,619

Fig. 6. Strain-life fatigue curves of torsion and tension-compression for extruded GW83 alloy.

Fig. 7. IPF map of extruded GW83 alloy after cyclic torsion: (a) Δγ/2 = 0.693%; (b) Δγ/2 = 4.157%.

Fig. 8. Extension {10-12} twins in extruded GW83 alloy after cyclic torsion at shear strain amplitudes of (a) Δγ/2 = 0.693%; (b) Δγ/2 = 4.157%. The grain orientations and shear planes corresponding to the parent grains and extension twins were added in the figure.

Fig. 9. Strain-life fatigue curve of shear fatigue for extruded GW83, AZ31B [23] and AZ61A [21,24] alloys.

Fig. 10. Relationship between plastic strain energy density and fatigue lives [22,23].

参考文献

[1]	X.J. Wang, D.K. Xu, R.Z. Wu, X.B. Chen, Q.M. Peng, L. Jin, Y.C. Xin, Z.Q. Zhang, Y. Liu, X.H. Chen, G. Chen, K.K. Deng, H.Y. Wang, J. Mater. Sci. Technol. 34 (2018) 245-247.
[2]	B.J. Wang, S.D. Wang, D.K. Xu, E.H. Han, J. Mater. Sci. Technol. 33 (2017) 1075-1086.
[3]	Y.N. Wang, J.C. Huang, Acta Mater. 55 (2007) 897-905.
[4]	A.S. Khan, A. Pandey, T. Gnäupel-Herold, R.K. Mishra, Int. J. Plast. 27 (2011) 688-706.
[5]	X.Y. Lou, M. Li, R.K. Boger, S.R. Agnew, R.H. Wagoner, Int. J. Plast. 23 (2007) 44-86.
[6]	F. Pan, M. Yang, X. Chen, J. Mater. Sci. Technol. 32 (2016) 1211-1221.
[7]	H. Pan, F. Wang, L. Jin, M. Feng, J. Dong, J. Mater. Sci. Technol. Res. 32 (2016) 1282-1288.
[8]	Q. Li, Q. Yu, J. Zhang, Y. Jiang, Scripta Mater. 64 (2011) 233-236.
[9]	L. Wu, A. Jain, D.W. Brown, G.M. Stoica, S.R. Agnew, B. Clausen, D.E. Fielden, P.K. Liaw, Acta Mater. 56 (2008) 688-695.
[10]	S. Dong, Q. Yu, Y. Jiang, J. Dong, F. Wang, L. Jin, W. Ding, Int. J. Plast. 91 (2017) 25-47.
[11]	S.M. He, X.Q. Zeng, L.M. Peng, X. Gao, J.F. Nie, W.J. Ding, J. Alloys Compd. 421 (2006) 309-313.
[12]	S.M. He, X.Q. Zeng, L.M. Peng, X. Gao, J.F. Nie, W.J. Ding, J. Alloys Compd. 427 (2007) 316-323.
[13]	F. Wang, J. Dong, Y. Jiang, W. Ding, Mater. Sci. Eng. A 561 (2013) 403-410.
[14]	S. Dong, F. Wang, Q. Wan, J. Dong, W. Ding, Y. Jiang, Mater. Sci. Eng. A 641 (2015) 1-9.
[15]	S. Biswas, B. Beausir, L.S. Toth, S. Suwas, Acta Mater. 61 (2013) 5263-5277.
[16]	J. Yu, Z. Zhang, P. Xu, B. Dong, Q. Wang, M. Meng, H. Hao, X. Li, X. Yin, J. Alloys Compd. 787 (2019) 239-253.
[17]	X.Q. Guo, W. Wu, P.D. Wu, H. Qiao, K. An, P.K. Liaw, Scripta Mater. 69 (2013) 319-322.
[18]	B. Song, H. Pan, L. Chai, N. Guo, H. Zhao, R. Xin, Mater. Sci. Eng. A 689 (2017) 78-88.
[19]	J. Hu, H. Gao, Y. Meng, Z. Zhang, L. Gao, Mater. Sci. Eng. A 726 (2018) 215-222.
[20]	N. Guo, B. Song, C. Guo, R. Xin, Q. Liu, Mater. Des. 83 (2015) 270-275.
[21]	J. Zhang, Q. Yu, Y. Jiang, Q. Li, Int. J. Plast. 27 (2011) 768-787.
[22]	J. Albinmousa, H. Jahed, S. Lambert, Int. J. Fatigue 33 (2011) 1403-1416.
[23]	Y. Xiong, Q. Yu, Y. Jiang, Mater. Sci. Eng. A 546 (2012) 119-128.
[24]	Q. Yu, J. Zhang, Y. Jiang, Q. Li, Int. J. Fatigue 33 (2011) 437-447.
[25]	T. Zhao, Y. Jiang, Int. J. Fatigue 30 (2008) 834-849.

Cyclic shear deformation and fatigue of extruded Mg-Gd-Y magnesium alloy

RichHTML

PDF (PC)

可视化

摘要/Abstract

引用本文

使用本文

图/表 11

参考文献

相关文章 0

编辑推荐

Metrics

本文评价