Change in elastic properties during room-temperature aging in body-centered cubic Mg-Li and Mg-Li-Al single crystals

doi:10.1016/j.jmst.2021.07.058

J. Mater. Sci. Technol. ›› 2022, Vol. 109: 49-53.DOI: 10.1016/j.jmst.2021.07.058

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Change in elastic properties during room-temperature aging in body-centered cubic Mg-Li and Mg-Li-Al single crystals

Ruxia Liu^a^,^b, Shota Higashino^c, Koji Hagihara^d, Lianmeng Zhang^b, Tohru Sekino^a, Masakazu Tane^c^,^*()

^aSANKEN (The Institute of Scientific and Industrial Research), Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan
^bState Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, China
^cGraduate School of Engineering, Osaka City University, 3-3-138 Sugimoto, Osaka, 558-8585, Japan
^dDepartment of Physical Science and Engineering, Nagoya Institute of Technology, Nagoya 466-8555, Japan

Revised:2021-06-30 Published:2022-05-20 Online:2022-05-18
Contact: Masakazu Tane
About author:* E-mail address: mtane@osaka-cu.ac.jp (M. Tane)

Abstract

Ruxia Liu, Shota Higashino, Koji Hagihara, Lianmeng Zhang, Tohru Sekino, Masakazu Tane. Change in elastic properties during room-temperature aging in body-centered cubic Mg-Li and Mg-Li-Al single crystals[J]. J. Mater. Sci. Technol., 2022, 109: 49-53.

Figures/Tables 5

Fig. 1. Powder XRD patterns of Mg-Li and Mg-Li-Al alloys (CuKα radiation).

Table 1. Elastic constants of Mg–Li and Mg–Li–Al alloy single crystals measured in this and previous studies [16] and the first-principles calculations based on density functional theory (DFT) for Mg50Li50 and Mg75Li25 [7] and pure Li [17] single crystals: elastic stiffness c11 (GPa), c12 (GPa), c44 (GPa), shear modulus ${c}'=\left( {{c}_{11}}-{{c}_{12}} \right)/2$ (GPa), bulk modulus $B=\left( {{c}_{11}}+2{{c}_{12}} \right)/3$ (GPa), Young's modulus along <100> direction ${{E}_{100}}=9/\left( 3/{c}'+1/B \right)$ (GPa), and Zener anisotropy factor A=c44/c′ [18].

Materials	c11	c12	c44	c′	B	E100	A
Mg-40Li (present work)	35.493	20.471	31.598	7.511	25.479	20.517	4.207
Mg-40Li-5Al (present work)	36.186	20.439	33.211	7.874	25.688	21.432	4.218
Mg-36.6Li (Exp.) [16]	36.1	21.9	30.7	7.1	26.6	19.6	4.32
Mg50Li50 (DFT) [7]	34.1	20.2	26.5	7.0	24.8	19.1	3.8
Mg75Li25 (DFT) [7]	41.7	24.8	36.4	8.5	30.4	23.2	4.3
Li (DFT) [17]	15.1	13.3	11.9	0.9	13.9	2.6	13.2

Fig. 2. (a) Shear modulus, c′, (b) shear modulus, c44, (c) bulk modulus, B, and (d) Young's modulus along the <100> direction, E100, of Mg-Li and Mg-Li-Al single crystals as a function of Mg concentration. The DFT calculations for Mg50Li50 and Mg75Li25 [7] are shown for comparison. Mg-Li (Exp.) indicates previously reported data [16].

Fig. 3. (a) Anisotropy factor, A, in the Mg-Li and Mg-Li-Al single crystals as a function of the Li concentration. Mg-Li (Exp.) indicates data measured in a previous study [16]. (b) Dependence of Young's modulus on the crystallographic orientation in the Mg-Li and Mg-Li-Al single crystals, between the <100> and <110> directions.

Fig. 4. Change in Young's modulus along the <100> direction (E100) of the Mg-Li and Mg-Li-Al single crystals during aging at 298 K and 276 K.

References 22

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Change in elastic properties during room-temperature aging in body-centered cubic Mg-Li and Mg-Li-Al single crystals

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