Structure and mechanical behavior of<i>in situ</i>developed Mg<sub>2</sub>Si phase in magnesium and aluminum alloys – a review

Seth, Prem Prakash; Kumar, Devendra

doi:10.1039/d0ra02744h

Cited by 57 publications

(13 citation statements)

References 82 publications

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“…[1][2][3] In the present scenario, magnesium alloy is gradually introduced to reduce weight due to its low density joined with aluminium alloy. [4][5][6] The magnesium density value is almost 2/3 rd that of aluminium, 1/4 th of zinc and 1/5 th of steel. Magnesium alloys are a balance between traditional technical alloys and a higher level of specific strength.…”

Section: Introductionmentioning

confidence: 97%

Influence of boron carbide content on dry sliding wear performances of AZ91D magnesium alloy

Aatthisugan

Murugesan

Rao

2022

Proceedings of the Institution of Mechanical Engineers, Part J:

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In this study, AZ91 magnesium alloy based metal matrix composites are made-up of bottom pouring stir casting with 0 wt.%, 1.5 wt.% and 3 wt.% boron carbide (B4C) particles reinforcements. The influence of hard reinforcements on mechanical properties such as hardness and tensile strength has been investigated for the casted composites samples. It was found that by adding 1.5 wt. % and 3 wt.% B4C particles, the Rockwell hardness value of 3.2% and 4.6%, Ultimate Tensile Strength (UTS) values of 15.5% and 26.3% of the composites increased respectively. The influence of B4C contents on AZ91D mg alloy wear study was carried out using pin on disc apparatus. Also, the effect of applied load (5N, 10N, and 20N) on wear properties was investigated. The results of the dry sliding wear tests show that AZ91D- B4C magnesium composite has less wear loss than the unreinforced AZ91D magnesium alloy. X-ray diffraction (XRD) analysis were performed for finding the various compounds such as MgO, B4C and Mg17Al12 present in the developed composites. Further, scanning electron microscopy (SEM) analysis were performed on the worn-out pin surfaces to investigate the wear pattern. These findings indicate that the addition of B4C content improved mechanical characteristics and wear resistance, which may also be used in the automotive and aerospace industries.

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Section: Introductionmentioning

confidence: 97%

Influence of boron carbide content on dry sliding wear performances of AZ91D magnesium alloy

Aatthisugan

Murugesan

Rao

2022

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…However, at a low solidification rate, eutectic Mg 2 Si phases with Chinese character shapes generally precipitate from Mg-Al-Si alloys, and when the Si content exceeds 1.38 wt.%, coarse dendritic primary Mg 2 Si phases with sharp corners and edges may appear, which will cause stress concentration and become a crack source, thereby deteriorating the strength and ductility of the alloy [ 7 ]. Therefore, it is necessary to control the size, morphology, and distribution of the Mg 2 Si phases to improve the comprehensive mechanical properties of these alloys [ 8 , 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of TiB2 Nanoparticle Content on the Microstructure and Mechanical Properties of TiB2/Mg-4Al-1.5Si Composites

et al. 2023

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Coarse primary and eutectic Mg2Si phases were generally precipitated in Mg-Al-Si alloys during solidification at a low cooling rate, which tends to deteriorate the strength and ductility of magnesium alloys due to stress concentration. Different volume fractions of TiB2 nanoparticles (1%, 3%, and 5%) were added to an Mg-4Al-1.5Si alloy to refine the coarse Mg2Si phases based on a heterogeneous nucleation mechanism. The nanoparticles were incorporated and dispersed in the molten Mg alloys and by using semi-solid stirring followed by ultrasonic treatment (SSUT), and TiB2/Mg-4Al-1.5Si composites were obtained. The effect of TiB2 content on the microstructure and mechanical properties of the composites was studied. The results showed that the average size of primary Mg2Si phases and α-Mg grains decreased as the TiB2 content raised, the dendritic primary Mg2Si phases were refined into polygonal shapes with smaller sizes, and the refined primary Mg2Si phases were uniformly distributed in the alloys after adding 1 vol.% or 3 vol.% TiB2 nanoparticles. As the TiB2 content increased, the morphology of the eutectic Mg2Si phases was modified from coarse Chinese characters to short rod or fine dot shapes. Vickers hardness and yield strength of the composites reached a maximum (153 HV and 90.9 MPa, respectively) when TiB2 content was 5 vol.%, while the most superior ultimate tensile strength (142.4 MPa) and elongation (9.2%) were obtained when TiB2 content was 3 vol.%, which were improved by 173.2%, 31.5%, 69.8%, and 187.5%, respectively compared with the Mg-4Al-1.5Si alloys.

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“…During die casting, small pores and shrinkage porosity are prone to appear in the casting, lowering the plasticity of the die casting, so it is not suitable to work under impact load and vibration and die castings usually cannot be used for hot extrusion. Under ordinary gravity casting, the Mg 2 Si phase of the alloy exists in the form of a Chinese script type after solidification [6]. From a mechanical point of view, this phase is easy to cause stress concentration and become a crack source, which eventually leads to the decline of the mechanical properties of the alloy, and this phase is difficult to eliminate by heat treatment.…”

Section: Introductionmentioning

confidence: 99%

The second phases of Mg–xAl–ySi–Ca alloys and their influences on properties

Liu

Jin

Lai

et al. 2022

Materials Science and Technology

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The types and changes of the second phases in the Mg–xAl–ySi–0.3Ca alloys and their effects on the properties of the alloys were studied. The results showed that within a certain range of Si and Al content, Si had the greatest influence on the size of the Mg2Si phase, while Al content affected the size and morphology of Mg17Al12 and Mg2Si phases. The CaMgSi phases were less affected by the Al and Si content. In a tensile test, the as-cast alloy had the best performance when it contained small Mg17Al12 and Mg2Si phases, and the Mg17Al12 phase was more likely to become the fracture source. The alloy we tested with the best corrosion resistance was Mg–4Al–0.7Si–0.3Ca alloy, the worst was Mg–6Al–0.7Si–0.3Ca alloy.

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Structure and mechanical behavior ofin situdeveloped Mg₂Si phase in magnesium and aluminum alloys – a review

Abstract: The demand for lightweight, high specific strength alloys has drastically increased in the last two decades.

Cited by 57 publications

References 82 publications

Influence of boron carbide content on dry sliding wear performances of AZ91D magnesium alloy

Influence of boron carbide content on dry sliding wear performances of AZ91D magnesium alloy

Effect of TiB2 Nanoparticle Content on the Microstructure and Mechanical Properties of TiB2/Mg-4Al-1.5Si Composites

The second phases of Mg–xAl–ySi–Ca alloys and their influences on properties

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Structure and mechanical behavior ofin situdeveloped Mg2Si phase in magnesium and aluminum alloys – a review

Abstract: The demand for lightweight, high specific strength alloys has drastically increased in the last two decades.

Cited by 57 publications

References 82 publications

Influence of boron carbide content on dry sliding wear performances of AZ91D magnesium alloy

Influence of boron carbide content on dry sliding wear performances of AZ91D magnesium alloy

Effect of TiB2 Nanoparticle Content on the Microstructure and Mechanical Properties of TiB2/Mg-4Al-1.5Si Composites

The second phases of Mg–xAl–ySi–Ca alloys and their influences on properties

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Structure and mechanical behavior ofin situdeveloped Mg₂Si phase in magnesium and aluminum alloys – a review