Fine-tuning the ductile-brittle transition temperature of Mg2Si intermetallic compound via Al doping

Li, Ao; Zhao, Xueni; Huang, Haiyou; Ma, Yuan; Gao, Lei; Su, Yanjing; Qian, Ping

doi:10.1007/s12613-019-1758-0

Cited by 12 publications

(6 citation statements)

References 28 publications

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“…Moreover, due to its in-situ formation, the Mg 2 Si particle exhibits cleaner interface with the matrix and is thermodynamically stable at high temperatures [13]. Therefore, these composites are generally used in fabrication of structural components in aerospace and automotive industries, in which energy consumption and power limitations are major concerns [14,15]. Moreover, they are extensively used in biomedical and electronic applications.…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties enhancement of Mg–4Si in-situ composites by friction stir processing

Taghiabadi

Moharami

2021

Materials Science and Technology

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The effect of friction stir processing (FSP) on the microstructure and mechanical properties of Mg–4Si composite was investigated. FSP was performed under the traverse speeds of 8, 12.5, and 16 mm min−1 at different rotation speeds of 800, 1250, and 1600 rev min−1. FSP greatly improved the mechanical properties of the composite. The optimum mechanical properties were obtained at the traverse and rotation speeds of 12.5 mm min−1 and 1250 rev min−1, respectively. The tensile strength, fracture strain, and microhardness of the composite were improved by about 140, 512, and 20%, respectively. The effective refinement and even distribution of Mg2Si particles, formation of ultrafine dynamically recrystallized grains, and the elimination of casting defects were the most influential factors affecting the properties of the alloy.

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Section: Introductionmentioning

confidence: 99%

Mechanical properties enhancement of Mg–4Si in-situ composites by friction stir processing

Taghiabadi

Moharami

2021

Materials Science and Technology

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“…In the previous study, we demonstrated that the strong covalent bond characteristic of the Si atom is the primary reason for its brittleness. 8 There are two main approaches to improve ductility. An effective approach is to refine the grain size, which can enhance the formability of alloys.…”

Section: Introductionmentioning

confidence: 99%

“…15 For Mg 2 Si alloys, at present, Al addition plays a critical role in increasing the ductility of Mg 2 Si. 8 Another research indicates that doping In, Li, Sn, and Bi can efficiently improve the ductility of Mg alloys. 16 However, the understanding of the effect of alloying elements on Mg 2 Si alloys is still far from sufficient and a great deal of effort is required to find ideal alloying elements.…”

Section: Introductionmentioning

confidence: 99%

“…Mg 2 Si has a face-centered cubic (FCC) CaF 2 -type crystal structure, which possesses sufficient possible dislocation slip systems. In the previous study, we demonstrated that the strong covalent bond characteristic of the Si atom is the primary reason for its brittleness . There are two main approaches to improve ductility.…”

Section: Introductionmentioning

confidence: 99%

“…Alloying can also change the anisotropy of electron distribution around Al atoms that could influence the slip behavior in pure aluminum . For Mg 2 Si alloys, at present, Al addition plays a critical role in increasing the ductility of Mg 2 Si . Another research indicates that doping In, Li, Sn, and Bi can efficiently improve the ductility of Mg alloys .…”

Section: Introductionmentioning

confidence: 99%

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Effect of Alloying Elements on the Stacking Fault Energy and Ductility in Mg₂Si Intermetallic Compounds

et al. 2021

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Alloying elements can pronouncedly change the mechanical properties of intermetallic compounds. However, the effect mechanism of this in Mg2Si alloys is not clear yet. In this paper, systematic first-principles calculations were performed to investigate the effect of alloying elements on the ductility of Mg–Si alloys. It was found that some alloying elements such as In, Cu, Pd, etc. could improve the ductility of Mg2Si alloys. Moreover, the interatomic bonding mechanisms were analyzed through the electron localization functional. Simultaneously, the machine-learning method was employed to help identify the most important features associated with the toughening mechanisms. It shows that the ground state atomic volume (V GS) is strongly related to the stacking fault energy (γus) of Mg2Si alloys. Interestingly, the alloying elements with appropriate V GS and higher Allred–Rochow electronegativity (En) would reduce the γus in the Mg–Si–X system and yield a better ductility. This work demonstrates how a fundamental theoretical understanding at the atomic and electronic levels can rationalize the mechanical properties of Mg2Si alloys at a macroscopic scale.

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Stress corrosion behavior of 6082 aluminum alloy

Zhou

Yang

et al. 2020

Materials & Corrosion

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Stress corrosion tests of 6082 aluminum alloy were carried out by using a three‐point bending fixture while holding at 50% of yield strength state through different immersion times in 1.5% NaCl electrolyte solution. The electrochemical impedance spectra and dynamic electric potential polarization curves were measured to indicate the stress corrosion behavior of the alloy. Optical microscopy, scanning electron microscopy, and X‐ray energy spectrum analysis were applied for microstructural investigations. The results show that all of the Nyquist electrochemical impedance spectra consisted of high‐ and low‐frequency double capacitive arcs. However, an increase in immersion time while holding at 50% of yield stress resulted in a corresponding increase in the corrosion current density, leading to gradual corrosion depth growth, and a decrease in the corrosion resistance of the alloy. 6082 Aluminum alloy included AlMnFeSi, Mg2Si, and Si secondary phases. The different secondary phases presented different stress corrosion behaviors. Stress corrosion cracks were generated at the boundaries of AlMnFeSi and matrix or within the AlMnFeSi phase. Crack direction is always perpendicular to the tensile stress applied. Mg2Si secondary phase was self‐corroded as its corrosion potential is lower than that of the matrix. As the electric potential of Si is higher than that of the matrix, corrosion occurred at the matrix side of the boundary between Si and matrix.

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Fine-tuning the ductile-brittle transition temperature of Mg2Si intermetallic compound via Al doping

Cited by 12 publications

References 28 publications

Mechanical properties enhancement of Mg–4Si in-situ composites by friction stir processing

Mechanical properties enhancement of Mg–4Si in-situ composites by friction stir processing

Effect of Alloying Elements on the Stacking Fault Energy and Ductility in Mg₂Si Intermetallic Compounds

Stress corrosion behavior of 6082 aluminum alloy

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Fine-tuning the ductile-brittle transition temperature of Mg2Si intermetallic compound via Al doping

Cited by 12 publications

References 28 publications

Mechanical properties enhancement of Mg–4Si in-situ composites by friction stir processing

Mechanical properties enhancement of Mg–4Si in-situ composites by friction stir processing

Effect of Alloying Elements on the Stacking Fault Energy and Ductility in Mg2Si Intermetallic Compounds

Stress corrosion behavior of 6082 aluminum alloy

Contact Info

Product

Resources

About

Effect of Alloying Elements on the Stacking Fault Energy and Ductility in Mg₂Si Intermetallic Compounds