Effect of Si addition on microstructure and properties of magnesium alloys with high Al and Zn contents

Wang, Mian; Xiao, D.H.; Liu, W.S.

doi:10.1016/j.vacuum.2017.04.005

Cited by 48 publications

(14 citation statements)

References 32 publications

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“…Since then, Mg alloys have gained more recognition as a structural material for lightweight applications because of their low density, high stiffness-to-weight ratio, favorable castability, shock absorption, and excellent damping. Nevertheless, Mg alloys have not been used for critical applications because of their inferior mechanical properties, high manufacturing cost, and unfavorable formability at room temperature compared with other engineering materials [1][2][3][4]. One of the most frequently used methods for enhancing the mechanical properties of alloys is through strengthening by means of second-phase particles [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Particle Size and Particle Percentage Effect of AZ61/SiCp Magnesium Matrix Micro- and Nano-Composites on Their Mechanical Properties Due to Extrusion and Subsequent Annealing

Zhao

Huang

et al. 2017

Metals

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Magnesium metal matrix composites (Mg MMCs) possess relatively more favorable mechanical properties than Mg alloys because they add reinforcements, such as small particles, short fibers, or continuous fibers, into the matrix. This study investigated the influence of adding different sizes and percentages of silicon carbide particles (SiCp) for manufacturing AZ61/SiCp Mg alloy composite extrusion plates on the mechanical properties of SiCp. We also examined the impact and discussed the evolution of microstructures, changes of material strength, ductility, formability, and other mechanical properties caused by a subsequent annealing treatment after plate extrusion. The results showed that the mechanical properties of plates can be improved by adding reinforcement particles. The effects of grain refinement were as follows: the smaller the size of the reinforcement particles, the greater the enhancement of mechanical properties. Among them, the AZ61/1 wt % SiCp/50 nm MMC plate had relatively excellent mechanical properties. Specifically, the ultimate tensile strength, yielding strength, ductility, hardness, and grain size of the plate were 331 MPa, 136.4 MPa, 43.1%, 62 HV,and 3.3 µm, respectively. Compared with SiCp-free Mg MMC plates, these properties of the AZ61/1 wt % SiCp/50 nm MMC plate were enhanced (or refined) by 6.4%, 3.4%, 83.4%, 2%, and 13.2%, respectively; by contrast, formability decreased by 9.1%.

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Section: Introductionmentioning

confidence: 99%

Particle Size and Particle Percentage Effect of AZ61/SiCp Magnesium Matrix Micro- and Nano-Composites on Their Mechanical Properties Due to Extrusion and Subsequent Annealing

Zhao

Huang

et al. 2017

Metals

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“…As such, the precipitated phases can be dissolved after solution treatment, which may be helpful in reducing the corrosion rate of magnesium alloy [ 19 ]. In contrast, the formation of network-precipitated phases blocks the corrosion of magnesium alloy and improves its corrosion resistance [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

Corrosion Behavior of the As-Cast and As-Solid Solution Mg-Al-Ge Alloy

et al. 2018

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The corrosion behavior of Mg-3Al-xGe (x = 1, 3, 5) alloy in as-cast and as-solid was investigated by virtue of microstructure, corrosion morphology observation, and electrochemical measurement. Among the as-cast alloys, the corrosion rate of Mg-3Al-1Ge with a discontinuous bar-morphology was the highest, which was 101.7 mm·a−1; the corrosion rate of Mg-3Al-3Ge with a continuous network distribution was the lowest, which was 23.1 mm·a−1; and the corrosion rate of Mg-3Al-5Ge of Ge-enriched phase with sporadic distribution was in-between, which was 63.9 mm·a−1. It is suggested that the morphology of the Mg2Ge phase changes with a change in Ge content, which affects the corrosion performance of the alloy. After solid solution treatment, the corrosion rate of the corresponding solid solution alloy increased—Mg-3Al-1Ge to 140.5 mm·a−1, Mg-3Al-3Ge to 52.9 mm·a−1, and Mg-3Al-5Ge to 87.3 mm·a−1, respectively. After investigation of the microstructure, it can be suggested that solid solution treatment dissolves the Mg17Al12 phase, which changes the phase composition of the alloy and also affects its microstructure, thus affecting its corrosion performance.

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“…3 Si is considered as an important alloying element for Mg alloys as the stable Mg 2 Si intermetallic exhibits a low density, a high melting point, a low thermal expansion coefficient (TEC) and a reasonably high elastic modulus. 4,5 In addition, the low solubility of Si in Mg could guarantee free movement of the dislocations segments. The great difference in TECs between Mg 2 Si and the a-Mg matrix can accelerate dislocation reproduction, which is helpful for improving the damping capacity.…”

Section: Introductionmentioning

confidence: 99%

Microstructure evolution and damping characteristics in cast Mg-Al-Si alloys

Chen¹,

Dong²

2018

Mater. Tehnol.

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The effects of increasing levels of Si on the microstructure and damping capacities of Mg-Al-Si alloys were investigated. The results show that the morphology of the Mg2Si phase is found to be a function of the Si content. The Mg2Si particles with up to 1.3 % of mass fractions of Si have a Chinese-script morphology and dendritic Mg2Si crystals were precipitated predominantly inside the grains of a 2.3 % of mass fractions of Si-containing alloy. The morphology and volume of the Mg2Si phase as well as the distribution of the Mg17Al12 eutectic have a significant effect on the damping capacity of the alloy. With a low strain amplitude, the dislocation density increases with the formation of Mg2Si particles, improving the damping property, while in the high-strain region, dispersed Mg17Al12 precipitates and coarse Mg2Si particles lead to a reduction of the internal friction.

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Effect of Si addition on microstructure and properties of magnesium alloys with high Al and Zn contents

Cited by 48 publications

References 32 publications

Particle Size and Particle Percentage Effect of AZ61/SiCp Magnesium Matrix Micro- and Nano-Composites on Their Mechanical Properties Due to Extrusion and Subsequent Annealing

Particle Size and Particle Percentage Effect of AZ61/SiCp Magnesium Matrix Micro- and Nano-Composites on Their Mechanical Properties Due to Extrusion and Subsequent Annealing

Corrosion Behavior of the As-Cast and As-Solid Solution Mg-Al-Ge Alloy

Microstructure evolution and damping characteristics in cast Mg-Al-Si alloys

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