Please wait a minute...
Acta Metall Sin  2019, Vol. 55 Issue (12): 1512-1518    DOI: 10.11900/0412.1961.2019.00149
Research paper Current Issue | Archive | Adv Search |
Generation and Interaction Mechanism of Tension Kink Band in AZ31 Magnesium Alloy
ZHOU Bo1,2,SUI Manling1,2()
1. Institute of Microstructure and Properties of Advanced Materials, Beijing University of Technology, Beijing 100124, China
2. Beijing Key Laboratory of Microstructure and Properties of Solids, Beijing University of Technology, Beijing 100124, China
Download:  HTML  PDF(9253KB) 
Export:  BibTeX | EndNote (RIS)      

The deformation structures, such as deformation twins, dislocations and kink bands, play an important role in the plasticity of magnesium alloys during the deformation process. However, due to the complexity of hcp structure, the deformation structures of the magnesium alloys, especially the interactions between deformation structures are still not well understood. Thus, it is of great scientific significance to study the microstructure of magnesium alloys, especially to characterize their structural characteristics of the interaction areas, which plays a significant role in understanding the structure and performance relationships of magnesium alloys. In this work, a combination of TEM and SAED pattern was applied to study the interaction mechanism associated with different kinds of deformation structures in Mg-Al-Zn (AZ31) alloy. When the applied external force is not beneficial for deformation twins and dislocations, kink bands act as a supplementary deformation mode to coordinate the asymmetry of hcp structure. According to crystallographic analysis, it is found that under the action of tensile stress nearly lie on basal plane in hcp structures, the basal dislocation pairs form and move to the opposite directions, forming tension kink band with the interface of {101ˉ2} plane. The angle between the tension kink band interface and the basal plane is about 43°. The tension kink bands can further contribute to the strength and toughness of the material. These results will open a new insight into the understanding of interaction mechanism of deformation structures and greatly promote the development of Mg alloys.

Key words:  Mg alloy      kink band      deformation twins      TEM     
Received:  07 May 2019     
ZTFLH:  TG146.22  
Fund: National Natural Science Foundation of China(Nos.11374028);National Natural Science Foundation of China(U1330112);National Natural Science Foundation of China(51621003);Scientific Research Key Program of Beijing Municipal Commission of Education(No.KZ201310005002);Beijing Municipal Found for Scientific Innovation(No.PXM2019_014204_500031)
Corresponding Authors:  Manling SUI     E-mail:

Cite this article: 

ZHOU Bo, SUI Manling. Generation and Interaction Mechanism of Tension Kink Band in AZ31 Magnesium Alloy. Acta Metall Sin, 2019, 55(12): 1512-1518.

URL:     OR

Fig.1  Sample preparation methods(a) sample dimensions and rolling direction (RD, ND and TD are the rolling direction, normal direction and transverse direction of the sample, respectively)(b) schematic of the rolled sample prepared for TEM specimen
Fig.2  TEM image of the high density kink bands (Two sets of approximately parallel kink bands: one group is K1, K3, K5, K7 and K9, while the other group is K2, K4 and K6)
Fig.3  TEM analyses of the interaction of kink bands(a) TEM image of the interaction area (Subscript M indicates matrix)(b~e) SAED patterns of different areas in Fig.3a
Fig.4  TEM analyses of interaction of {101ˉ1}<101ˉ2ˉ> twin and kink band(a) TEM image of the interaction area (The dashed blue lines and green lines indicate the kink band interface and the twin boundary, respectively; SFs—stacking faults)(b~e) SAED patterns of different areas in Fig.4a (Subscript T indicates twin)
Fig.5  Schematics of the tension kink band formation mechanism(a) generation of dislocation pairs in initial structure (F indicate the force direction)(b) formation of K1 (α1 is the angle between the interface of K1 and the basal plane of matrix. The inset shows the orientation between the matrix and kink band under the external force)(c) interaction of K1 and K2 (α2 is the angle between the interface of K2 and the basal plane of matrix)
Fig.6  Schematics of deformation structures(a) interaction between tension kink band and {101ˉ1} twin (b) kink band (c) {101ˉ1} twin
Deformation structureForce directionSlip planeSlip directionSchmid factor
(101ˉ1) twin[2ˉ111](101ˉ1)[101ˉ2ˉ]0.349
(101ˉ1ˉ) twin[2ˉ111](101ˉ1ˉ)[101ˉ2]-0.056
Kink band[2ˉ111](0001)[12ˉ10]0.209
Table 1  Schmid factors of different deformation structures
[1] Aghion E, Bronfin B. Magnesium alloys development towards the 21st century [A]. Materials Science Forum [C]. Switzerland: Trans. Tech. Publications, 2000: 19
[2] Barnett M R. Twinning and the ductility of magnesium alloys [J]. Mater. Sci. Eng., 2007, A464: 8
[3] Cizek P, Barnett M R. Characteristics of the contraction twins formed close to the fracture surface in Mg-3Al-1Zn alloy deformed in tension [J]. Scr. Mater., 2008, 59: 959
[4] Suh B C, Shim M S, Shin K S, et al. Current issues in magnesium sheet alloys: Where do we go from here? [J]. Scr. Mater., 2014, 84-85: 1
[5] Pollock T M. Weight loss with magnesium alloys [J]. Science, 2010, 328: 986
[6] Frankel G S. Magnesium alloys: Ready for the road [J]. Nat. Mater., 2015, 14: 1189
[7] Joost W J, Krajewski P E. Towards magnesium alloys for high-volume automotive applications [J]. Scr. Mater., 2017, 128: 107
[8] Yoo M H, Lee J K. Deformation twinning in h.c.p. metals and alloys [J]. Philos. Mag., 1991, 63A: 987
[9] Yoo M H. Slip, twinning, and fracture in hexagonal close-packed metals [J]. Metall. Trans., 1981, 12A: 409
[10] Mu S J, Tang F, Gottstein G. A cluster-type grain interaction deformation texture model accounting for twinning-induced texture and strain-hardening evolution: Application to magnesium alloys [J]. Acta Mater., 2014, 68: 310
[11] Orowan E. A type of plastic deformation new in metals [J]. Nature, 1942, 149: 643
[12] Hess J B, Barrett C S. Structure and nature of kink bands in zinc [J]. JOM, 1949, 1(9): 599
[13] Shao X H, Yang Z Q, Ma X L. Strengthening and toughening mechanisms in Mg-Zn-Y alloy with a long period stacking ordered structure [J]. Acta Mater., 2010, 58: 4760
[14] Shao X H, Peng Z Z, Jin Q Q, et al. Atomic-scale segregations at the deformation-induced symmetrical boundary in an Mg-Zn-Y alloy [J]. Acta Mater., 2016, 118: 177
[15] Matsumoto T, Yamasaki M, Hagihara K, et al. Configuration of dislocations in low-angle kink boundaries formed in a single crystalline long-period stacking ordered Mg-Zn-Y alloy [J]. Acta Mater., 2018, 151: 112
[16] Hagihara K, Mayama T, Honnami M, et al. Orientation dependence of the deformation kink band formation behavior in Zn single crystal [J]. Int. J. Plast., 2016, 77: 174
[17] Yang X Y, Jiang Y P. Morphology and crystallographic characteristics of deformation bands in Mg alloy under hot deformation [J]. Acta Metall. Sin., 2010, 46: 451
[17] (杨续跃, 姜育培. 镁合金热变形下变形带的形貌和晶体学特征 [J]. 金属学报, 2010, 46: 451)
[18] Wang J, Beyerlein I J, Tomé C N. Reactions of lattice dislocations with grain boundaries in Mg: Implications on the micro scale from atomic-scale calculations [J]. Int. J. Plast., 2014, 56: 156
[19] Zhou N, Zhang Z Y, Jin L, et al. Ductility improvement by twinning and twin-slip interaction in a Mg-Y alloy [J]. Mater. Des., 2014, 56: 966
[20] Wang F L, Agnew S. Magnesium Technology 2015 [M]. New Jersey: Springer, 2015: 139
[21] Beyerlein I J, Wang J, Barnett M R, et al. Double twinning mechanisms in magnesium alloys via dissociation of lattice dislocations [J]. Proc. Roy. Soc., 2012, 468A: 1496
[22] Zhou B, Tai J, Lu Y, et al. Dislocation-modified high index twinning mechanisms in deformed magnesium alloy [J]. J. Alloys Compd., 2019, 787: 423
[23] Anderson T B. Kink Bands [M]. Berlin: Springer, 1987: 373
[24] Li X C, Li J W, Zhou B, et al. Interaction of {1122} twin variants in hexagonal close-packed titanium [J]. J. Mater. Sci. Technol., 2019, 35: 660
[1] LI Yuancai, JIANG Wugui, ZHOU Yu. Effect of Temperature on Mechanical Propertiesof Carbon Nanotubes-Reinforced Nickel Nano-Honeycombs[J]. 金属学报, 2020, 56(5): 785-794.
[2] LIU Zhengdong,CHEN Zhengzong,HE Xikou,BAO Hansheng. Systematical Innovation of Heat Resistant Materials Used for 630~700 ℃ Advanced Ultra-Supercritical (A-USC)Fossil Fired Boilers[J]. 金属学报, 2020, 56(4): 539-548.
[3] XIAO Hong,XU Pengpeng,QI Zichen,WU Zonghe,ZHAO Yunpeng. Preparation of Steel/Aluminum Laminated Composites by Differential Temperature Rolling with Induction Heating[J]. 金属学报, 2020, 56(2): 231-239.
[4] WANG Zumin,ZHANG An,CHEN Yuanyuan,HUANG Yuan,WANG Jiangyong. Research Progress on Fundamentals and Applications of Metal-Induced Crystallization[J]. 金属学报, 2020, 56(1): 66-82.
[5] LIU Yang,WANG Lei,SONG Xiu,LIANG Taosha. Microstructure and High-Temperature Deformation Behavior of Dissimilar Superalloy Welded Joint of DD407/IN718[J]. 金属学报, 2019, 55(9): 1221-1230.
[6] GONG Shengkai, SHANG Yong, ZHANG Ji, GUO Xiping, LIN Junpin, ZHAO Xihong. Application and Research of Typical Intermetallics-Based High Temperature Structural Materials in China[J]. 金属学报, 2019, 55(9): 1067-1076.
[7] Liping DENG,Kaixuan CUI,Bingshu WANG,Hongliang XIANG,Qiang LI. Microstructure and Texture Evolution of AZ31 Mg Alloy Processed by Multi-Pass Compressing Under Room Temperature[J]. 金属学报, 2019, 55(8): 976-986.
[8] Jinyao MA,Jin WANG,Yunsong ZHAO,Jian ZHANG,Yuefei ZHANG,Jixue LI,Ze ZHANG. Investigation of In Situ 1150 High Temperature Deformation Behavior and Fracture Mechanism of a Second Generation Single Crystal Superalloy[J]. 金属学报, 2019, 55(8): 987-996.
[9] Mingyu ZHAO,Huijuan ZHEN,Zhihong DONG,Xiuying YANG,Xiao PENG. Preparation and Performance of a Novel Wear-Resistant and High Temperature Oxidation-Resistant NiCrAlSiC Composite Coating[J]. 金属学报, 2019, 55(7): 902-910.
[10] Baojun ZHAO,Yuhong ZHAO,Yuanyang SUN,Wenkui YANG,Hua HOU. Effect of Mn Composition on the Nanometer Cu-Rich Phase of Fe-Cu-Mn Alloy by Phase Field Method[J]. 金属学报, 2019, 55(5): 593-600.
[11] Hanchen FENG,Xuegang MIN,Dasheng WEI,Lichu ZHOU,Shiyun CUI,Feng FANG. Effect of Low Temperature Annealing on Microstructure and Mechanical Properties of Ultra-Heavy Cold-DrawnPearlitic Steel Wires[J]. 金属学报, 2019, 55(5): 585-592.
[12] Hui FANG,Hua XUE,Qianyu TANG,Qingyu ZHANG,Shiyan PAN,Mingfang ZHU. Dendrite Coarsening and Secondary Arm Migration in the Mushy Zone During Directional Solidification:[J]. 金属学报, 2019, 55(5): 664-672.
[13] Wentao LI,Zhenyu WANG,Dong ZHANG,Jianguo PAN,Peiling KE,Aiying WANG. Preparation of Ti2AlC Coating by the Combination of a Hybrid Cathode Arc/Magnetron Sputtering with Post-Annealing[J]. 金属学报, 2019, 55(5): 647-656.
[14] Juan DU, Xiaoxing CHENG, Tiannan YANG, Longqing CHEN, Frédéric Mompiou, Wenzheng ZHANG. In Situ TEM Study on the Sympathetic Nucleation of Austenite Precipitates[J]. 金属学报, 2019, 55(4): 511-520.
[15] Ping LI, Quan LIN, Yufeng ZHOU, Kemin XUE, Yucheng WU. TEM Analysis of Microstructure Evolution Process of Pure Tungsten Under High Pressure Torsion[J]. 金属学报, 2019, 55(4): 521-528.
No Suggested Reading articles found!