Microstructure, Mechanical Properties and Strain Hardening Behavior of Alternative α/β Mg-Li Composite Sheets Prepared by Accumulative Roll Bonding

다국어 초록 (Multilingual Abstract)

To improve comprehensive mechanical properties of Mg-Li alloy, alternative α/β Mg-Li composite sheets with a bimodalgrainedstructure were prepared by accumulative roll bonding (ARB). The microstructure, texture, mechanical propertiesand strain hardening behavior of the alternative α/β Mg-Li composite sheets were studied. The bimodal grain structure,with ultrafine grains (about 0.79 μm) in the α alloy and coarse grains (about 53.28 μm) in the β alloy, can be observed in thecomposite sheet. The dominant texture of α-Mg and β-Li alloys is {0002} basal texture and {110} texture, respectively. Inthe α alloy, the basal texture decreases gradually with the increase of ARB pass, and the non-basal texture is formed in thesheet processed by 5-pass ARB. The dislocation density of the composite sheet gradually increases and approaches saturationafter 3-pass ARB process due to the balance between dislocation accumulation in the ARB process and dislocationannihilation in dynamic recovery. The sheet processed by 3-pass ARB has the preferable strength and plasticity, with yieldstrength, ultimate tensile strength, elongation of 204 MPa, 216 MPa, 22.73%, respectively. Compared with the as-annealedalloys before ARB, the strain hardening rate of the ARB composite sheets increases gradually at low stress (stage II). Mg-Lisheets produced by ARB process remain a high plasticity because of the longer softening stage (stage III), which is mainlycontributed to the synergistic effect of the bimodal grain structure and the activation of non-basal texture.

참고문헌 (Reference)

1 J. H. Wang, 33 : 490-, 2020

2 J. Koike, 44 : 445-, 2003

3 S. Y. Jin, 788 : 139611-, 2020

4 Z. Z. Jin, 833 : 155004-, 2020

5 K. K. Alaneme, 5 : 460-, 2017

6 N. Tsuji, 5 : 338-, 2003

7 M. Naseri, 656 : 12-, 2016

8 Y. Wang, 761 : 138049-, 2019

9 J. A. del Valle, 54 : 4247-, 2006

10 J. Feng, 667 : 97-, 2016

11 D. Esqué-de los Ojos, 729 : 37-, 2018

12 R. Li, 562 : 33-, 2013

13 D. Wang, 881 : 160663-, 2021

14 M. Karami, 607 : 512-, 2014

15 H. Y. Wu, 527 : 7197-, 2010

16 M. Lentz, 86 : 254-, 2015

17 H. Wu, 254 : 265-, 2018

18 Y. Yang, 44 : 1101-, 2013

19 W. S. Wu, 117 : 45-, 2014

20 L. L. C. Catorceno, 6 : 121-, 2018

21 S. Yin, 177 : 108962-, 2020

22 D. J. Savage, 125 : 1-, 2020

23 M. Duan, 823 : 153691-, 2020

24 N. Kamikawa, 55 : 5873-, 2007

25 Y. Sun, 755 : 201-, 2019

26 J. Wang, 157 : 109924-, 2019

27 A. Nazari, 50 : 1781-, 2011

28 J. Shi, 26 : 2912-, 2017

29 C. R. Hutchinson, 36 : 2093-, 2005

30 M. J. Phasha, 18 : 2083-, 2010

31 S. O. Gashti, 658 : 854-, 2016

32 H. Zhang, 780 : 312-, 2019

33 Y. Wang, 61 : 197-, 2021

34 X. Zhang, 275 : 116378-, 2020

35 F. Cao, 745 : 436-, 2018

36 Z. Trojanová, 67 : 1965-, 2007

37 M. Reihanian, 473 : 189-, 2008

38 N. Afrin, 57 : 1004-, 2007

39 D. Zhang, 728 : 404-, 2017

40 U. F. Kocks, 48 : 171-, 2003

41 J. H. Peng, 817 : 153302-, 2020

42 Q. X. Shi, 772 : 138827-, 2020

43 T. Al-Samman, 57 : 2229-, 2009

44 X. Liu, 583 : 242-, 2013

45 X. Li, 805 : 947-, 2019

46 H. L. Kim, 540 : 198-, 2012

47 B. J. Wang, 120 : 46-, 2019