Effect of the precipitated phase of MgZn2 on surface nanocrystallization of Al-Zn-Mg alloy based on high-frequency impacting and rolling

Zhao, Xiaohui; Chen, Chao; Chen, Fu‐Rong

doi:10.1016/j.matlet.2016.11.107

Cited by 16 publications

(2 citation statements)

References 20 publications

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“…According to the literature, , the Zn–Mg alloy powder with a complex crystal structure becomes liquid at 344°C, which is related to the zinc content. , When the Zn content varies from 0 to 4 wt %, it can be seen from the Mg–Zn phase diagram that when the Zn content exceeds 3 wt % at 893 K, it is likely to form a liquid phase. , With the further increase of the Zn content, the diffusion rate of Mg and Zn particles may be greatly increased due to the participation of the liquid phase. 344 °C is the temperature boundary point tending to form the liquid phase.…”

Section: Resultsmentioning

confidence: 99%

Kinetics and Combustion Behavior of Atomized Zn–Mg Alloy Powder

Zhang

Zhu

Xie³

et al. 2023

ACS Omega

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Using pyrolants instead of warhead charges can release red light and thick smoke for target practice to highlight the safety of the impact point and dud disposal. In order to find the ideal material, the combustion and kinetic properties of two Zn–Mg alloys at critical proportions were investigated. Thermogravimetry/differential scanning calorimetry (TG/DSC) experiments in pure oxygen were conducted with atomized Zn–Mg alloy powder in the ratio of 7:3 and the ratio of 8:2 with three particle diameters under different heating rates. The kinetic parameters of the six materials were obtained by ASTM E698 and Ozawa–Flynn–Wall (OFW) methods, indicating that the activation energy (E α) of the 7:3 Zn–Mg alloy powder was lower than that of the 8:2 Zn–Mg alloy powder when the particle size distributions are similar. By the method of nonlinear multivariate regression, the oxidation reaction of Zn–Mg alloy powder was divided into two steps. The proportion of mass gain of the first-step reaction of 7:3 Zn–Mg alloy powder was 0.462–0.518, and the proportion of mass gain of the first-step reaction of 8:2 Zn–Mg alloy powder was 0.138–0.228. Reaction mechanism functions of the two-step reaction of Zn–Mg alloy oxidation were derived as f(α) = (1 – α) n (1 + k cat·α). The results of combustion experiments showed that the pyrolants composed of 7:3 alloy can burn stably to produce satisfactory smoke and light signals, while the pyrolants composed of 8:2 alloy cannot achieve this. The 7:3 Zn–Mg alloy powder is an ideal ingredient for pyrotechnic compositions.

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Section: Resultsmentioning

confidence: 99%

Kinetics and Combustion Behavior of Atomized Zn–Mg Alloy Powder

Zhang

Zhu

Xie³

et al. 2023

ACS Omega

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“…1. Introduction: Severe plastic deformation (SPD) has been applied to produce gradient nanograins of bulk materials without changing their chemical composition [1,2]. A variety of surface gradient nanocrystallisation (SGN) processes have been applied in recent years, such as ultrasonic shot peening (USSP), high-energy shot peening, deep rolling, ultrasonic cold forging technology and so on.…”

mentioning

confidence: 99%

Effect of precipitated phase on dislocation activity under high‐frequency impacting and rolling

Zhang

Qiu

De-sheng

et al. 2018

Micro & Nano Letters

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Al-Mg-Si alloy was treated through high-frequency impacting and rolling. Microstructures of different deformation layers were observed by transmission electron microscopy. The interaction mechanism between precipitated phase and dislocations for different deformation layer was studied. A detailed schematic of coordinated deformation dislocation mechanism around precipitated phase was established. Results show that lots of coordinated deformation dislocations are formed around the precipitated phase which is far away from the treated surface. With the decrease of distance from the treated surface, dislocation motion is blocked and dislocation lines gradually intersect, which speed up the segmentation and refinement of grains.

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Effect of Zn Concentration on the Microstructure and Mechanical Properties of Al-Mg-Si-Zn Alloys Processed by Gravity Die Casting

Zhu

et al. 2018

Metall Mater Trans A

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The microstructure and mechanical properties of Al-8.1Mg-2.6Si-(0.08 to 4.62)Zn alloys (in wt pct) have been investigated by the permanent mold casting process. X-ray diffraction analysis shows that the s-Mg 32 (Al, Zn) 49 phase forms when the Zn content is 1.01 wt pct. With higher Zn contents of 2.37 and 3.59 wt pct, the g-MgZn 2 and s-Mg 32 (Al, Zn) 49 phases precipitate in the microstructure, and the g-MgZn 2 phase forms when the Zn content is 4.62 wt pct. Metallurgical analysis shows that the g-MgZn 2 and s-Mg 32 (Al, Zn) 49 phases strengthen the Al-8.1Mg-2.6Si-(0.08 to 4.62)Zn alloys. After solutionizing at 510°C for 180 minutes and aging at 180°C for 90 minutes, the g¢-MgZn 2 phase precipitates in the a-Al matrix, which significantly enhances the mechanical properties. Addition of 3.59 wt pct Zn to the Al-8.1Mg-2.6Si alloy with heat treatment increases the yield strength from 96 to 280 MPa, increases the ultimate tensile strength from 267 to 310 MPa, and decreases the elongation from 9.97 to 1.74 pct.

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Effect of the precipitated phase of MgZn2 on surface nanocrystallization of Al-Zn-Mg alloy based on high-frequency impacting and rolling

Cited by 16 publications

References 20 publications

Kinetics and Combustion Behavior of Atomized Zn–Mg Alloy Powder

Kinetics and Combustion Behavior of Atomized Zn–Mg Alloy Powder

Effect of precipitated phase on dislocation activity under high‐frequency impacting and rolling

Effect of Zn Concentration on the Microstructure and Mechanical Properties of Al-Mg-Si-Zn Alloys Processed by Gravity Die Casting

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