Enhanced Mechanical Properties and Thermal Stability Mechanism of a High Solid Solution Al-Mg Alloy Processed by Cryogenic High-Reduction Hard-Plate Rolling

doi:10.11900/0412.1961.2022.00239

Acta Metall Sin

2024, Vol. 60

Issue (4): 473-484 DOI: 10.11900/0412.1961.2022.00239

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Enhanced Mechanical Properties and Thermal Stability Mechanism of a High Solid Solution Al-Mg Alloy Processed by Cryogenic High-Reduction Hard-Plate Rolling

TIAN Teng¹, ZHA Min¹^,²^,³(

), YIN Haoliang¹, HUA Zhenming¹, JIA Hailong¹^,³, WANG Huiyuan¹^,²^,³(

)

1 Key Laboratory of Automobile Materials of Ministry of Education, School of Materials Science and Engineering, Jilin University, Changchun 130025, China
2 State Key Laboratory of Super Hard Materials, Jilin University, Changchun 130012, China
3 International Center of Future Science, Jilin University, Changchun 130012, China

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TIAN Teng, ZHA Min, YIN Haoliang, HUA Zhenming, JIA Hailong, WANG Huiyuan. Enhanced Mechanical Properties and Thermal Stability Mechanism of a High Solid Solution Al-Mg Alloy Processed by Cryogenic High-Reduction Hard-Plate Rolling. Acta Metall Sin, 2024, 60(4): 473-484.

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Abstract

Al-Mg series alloys are highly desirable for structural applications, owing to their high specific strength, good formability, and excellent corrosion resistance. However, high-strength Al-Mg alloys prepared via severe plastic deformation generally exhibit poor thermal stability, which is caused by the high-density grain boundaries (GBs). Achieving simultaneous high strength and thermal stability in binary Al-Mg alloys remains a challenge. In this study, Al-9Mg alloys with a combination of high strength (~597 MPa), decent elongation (~7.7%), and enhanced thermal stability were developed via cryogenic high-reduction hard-plate rolling (CHR-HPR). The effects of solute Mg content on the microstructure evolution and mechanical properties of CHR-HPR Al-Mg alloys were systematically investigated using EBSD, TEM, microhardness measurements, and tensile tests. The high yield strength is derived from high-density dislocations and low-angle GBs promoted via the high content of solute Mg atoms and low deformation temperature. In addition to the positive roles of Mg atoms and low deformation temperature on work-hardening ability, the simultaneous improvement in the ultimate tensile strength and ductility of CHR-HPR Al-Mg alloys with increasing solute Mg content is partially attributed to the enhanced work hardening induced via the dynamic strain aging. Furthermore, the recrystallization temperature of the CHR-HPR Al-Mg alloys gradually increased with increasing solute Mg content, and the recrystallization temperature of CHR-HPR Al-9Mg could reach 400^oC. The enhanced thermal stability of CHR-HPR Al-9Mg alloy is due to the high content Mg solute atoms, which strongly retard recovery and recrystallization by dragging dislocations and pinning GBs.

Key words: Al-Mg alloy cryogenic hard-plate rolling work hardening mechanical property microstructure recrystallization

Received: 12 May 2022

ZTFLH:

TG146.2

Fund: National Natural Science Foundation of China(51922048);National Natural Science Foundation of China(51625402);National Natural Science Foundation of China(51790483)

Corresponding Authors: ZHA Min, professor, Tel:(0431)85094699, E-mail: minzha@jlu.edu.cn;
WANG Huiyuan, professor, Tel:(0431)85095415, E-mail: wanghuiyuan@jlu.edu.cn

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	TIAN Teng
	ZHA Min
	YIN Haoliang
	HUA Zhenming
	JIA Hailong
	WANG Huiyuan

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https://www.ams.org.cn/EN/10.11900/0412.1961.2022.00239 OR https://www.ams.org.cn/EN/Y2024/V60/I4/473

Table 1 Chemical compositions of the investigated Al-Mg alloys

Fig.1 XRD spectra of the as-extruded and cryogenic high-reduction hard-plate rolling (CHR-HPR) Al-Mg alloys (Dotted vertical lines represent the theoretical diffraction peaks of pure Al)

Table 2 Lattice parameters and the losses of Mg concentration in solid solution determined from XRD spectra of the pure Al^[8], as-extruded, and CHR-HPR Al-Mg alloys

Fig.2 EBSD analyses of CHR-HPR Al-1Mg (a, d), CHR-HPR Al-5Mg (b, e), and CHR-HPR Al-9Mg (c, f) alloys (High-angle grain boundaries (HAGBs) are defined by misorientation angle (θ) > 15°, and low-angle grain boundaries (LAGBs) are defined by 2° < θ < 15°, respectively. TD—transverse direction, RD—rolling direction) (a-c) inverse pole figure maps (d-f) kernel average misorientation (KAM) images

Fig.3 TEM images of the CHR-HPR Al-1Mg (a-c), CHR-HPR Al-5Mg (d-f), and CHR-HPR Al-9Mg (g-i) alloys (Insets in Figs.3c, f, and i are the corresponding selected area electron diffraction patterns of the matrix)

Fig.4 Tensile properties of CHR-HPR Al-Mg alloys
(a) engineering stress-strain curves
(b) true stress-strain curves (Inset in Fig.4b shows the locally magnified section)
(c) work hardening rate as a function of true strain

Fig.5 Microhardness evolution of CHR-HPR Al-Mg alloys annealed at different temperatures for 30 min

Fig.6 Engineering stress-strain curves of CHR-HPR Al-Mg alloys annealed at 275^oC (a), 300^oC (b), 350^oC (c), and 400^oC (d) for 30 min

Fig.7 EBSD analyses of CHR-HPR Al-1Mg (a, d), Al-5Mg (b, e), and Al-9Mg (c, f) alloys annealed at 275^oC for 30 min (ND—normal direction) (a-c) inverse pole figure maps (d-f) different types of grains

Fig.8 EBSD analyses of CHR-HPR Al-1Mg (a, d), Al-5Mg (b, e), and Al-9Mg (c, f) alloys annealed at 300^oC for 30 min (a-c) inverse pole figure maps (d-f) different types of grains

Fig.9 EBSD analyses of CHR-HPR Al-1Mg (a, d), Al-5Mg (b, e), and Al-9Mg (c, f) alloys annealed at 350^oC for 30 min (a-c) inverse pole figure maps (Insets in Figs.9a and b are the corresponding grain size distribution charts. d_ave— average grain size) (d-f) different types of grains

Fig.10 EBSD analyses of CHR-HPR Al-1Mg (a, d), Al-5Mg (b, e), and Al-9Mg (c, f) alloys annealed at 400^oC for 30 min (a-c) inverse pole figure maps (Insets in Figs.10a-c are the corresponding grain size distribution charts) (d-f) different types of grains

Fig.11 Microstructure evolution models of CHR-HPR Al-1Mg (a_i-e_i), Al-5Mg (a_ii-e_ii), and Al-9Mg (a_iii-e_iii) alloys before (a_i-a_iii) and after annealing at 275^oC (b_i-b_iii), 300^oC (c_i-c_iii), 350^oC (d_i-d_iii), and 400^oC (e_i-e_iii) (Red lines represent deformation bands and green hexagons represent recrystallized grains, while black and gray curve lines represent HAGBs and LAGBs, respectively)

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