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J. Mater. Sci. Technol.  2020, Vol. 38 Issue (0): 39-46    DOI: 10.1016/j.jmst.2019.06.025
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Age hardening responses of as-extruded Mg-2.5Sn-1.5Ca alloys with a wide range of Al concentration
Qiuyan Huanga, Yang Liua, Aiyue Zhangbc, Haoxin Jiangbc, Hucheng Panbc*(), Xiaohui Fenga, Changlin Yangd, Tianjiao Luoa, Yingju Lia, Yuansheng Yanga**()
aInstitute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China
bKey Laboratory for Anisotropy and Texture of Materials (MOE), School of Materials Science and Engineering, Northeastern University, Shenyang, 110819, China
cResearch Center for Metallic Wires, Northeastern University, Shenyang, 110819, China
dState Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an, 710072, China
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Abstract  

This article aims to explore the age hardening responses of both as-extruded and as-aged Mg-2.5Sn-1.5Ca-xAl alloys (x = 2.0, 4.0 and 9.0 wt%, termed TXA322, TXA324 and TXA329, respectively) through microstructural and mechanical characterization. Results indicate that grain size of as-extruded TXA322, TXA324 and TXA329 alloys were ~ 16 μm, ~ 10 μm and ~ 12 μm, respectively. A number of <a> and <c+a> dislocations were observed in all the as-extruded samples. Guinier - Preston (GP) zones were evidently identified in TXA322 alloy, while only a small number of Mg17Al12 phases existed in both TXA324 and TXA329 alloys. An aging treatment facilitated the precipitation of a high number density of GP zones within the matrix of TXA322 alloy. In contrast, no obvious nano-precipitates were in as-aged TXA324 alloy. Numerous nano-Mg17Al12 phases were formed through a following aging treatment in TXA329 alloy. In terms of mechanical properties, it is apparent that an increment in ultimate tensile strength of ~ 46 MPa and ~ 40 MPa was yielded in peak-aged TXA322 and TXA329 alloys, while no obvious variations in UTS were present in peak-aged TXA324 alloy, in comparison with the as-extruded counterparts.

Key words:  Magnesium alloys      Age hardening      Precipitations      Dislocations      Mechanical properties     
Received:  15 March 2019     
Corresponding Authors:  Pan Hucheng,Yang Yuansheng     E-mail:  panhc@atm.neu.edu.cn;ysyang@imr.ac.cn

Cite this article: 

Qiuyan Huang, Yang Liu, Aiyue Zhang, Haoxin Jiang, Hucheng Pan, Xiaohui Feng, Changlin Yang, Tianjiao Luo, Yingju Li, Yuansheng Yang. Age hardening responses of as-extruded Mg-2.5Sn-1.5Ca alloys with a wide range of Al concentration. J. Mater. Sci. Technol., 2020, 38(0): 39-46.

URL: 

https://www.jmst.org/EN/10.1016/j.jmst.2019.06.025     OR     https://www.jmst.org/EN/Y2020/V38/I0/39

Fig. 1.  (a) Optical image, (b) SEM image and (c) the corresponding EDS results for the as-extruded TXA322 alloy, including (d) the XRD result. The (0002) X-ray pole figure of as-extruded TXA322 alloy can be found in inset image of Fig. 1(a).
Fig. 2.  Optical and SEM image of the as-extruded (a, c) TXA324 and (b, d) TXA329 alloys, with the corresponding pole figures inserted in the Fig. 2(a) and Fig. 2(b).
Fig. 3.  XRD patterns of the as-extruded TXA324 and TXA329 alloys.
Fig. 4.  TEM images of the as-extruded TXA322 alloy under the two-beam condition of g=<0001> (a, b) and g=<10-10> (c) and SADPs and EDS results for the phase 1# existed in the Fig. 4(b) (d).
Fig. 5.  TEM images of the as-extruded (a, b) TXA324 and (c, d) TXA329 alloys.
Fig. 6.  Age-hardening response of as-extruded TXA322, TXA324 and TXA329 alloys.
Fig. 7.  TEM images of the as-aged TXA322 alloys, including the precipitations of GP zones along and nearby the dislocation lines.
Fig. 8.  TEM images of the as-aged TXA329 alloys.
Sample As-extruded Aged
σs (MPa) σb (MPa) δ (%) σs (MPa) σb (MPa) δ (%)
TXA322 130 ± 5 248 ± 5 12.5 ± 2 155 ± 4 294 ± 7 9.2 ± 1
TXA324 136 ± 7 252 ± 3 11.4 ± 3 140 ± 6 254 ± 2 9.6 ± 3
TXA329 157 ± 4 269 ± 6 9.8 ± 2 230 ± 6 309 ± 5 7.5 ± 2
Table 1  Mechanical properties of the TXA322, TXA324 and TXA329 alloys.
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