Microstructure and mechanical properties of AZ91 magnesium alloy with minor additions of Sm, Si and Ca elements

Bonnah, Redeemina C.; Fu, Yu; Hai, Hong

doi:10.1007/s41230-019-9067-9

Cited by 23 publications

(7 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Reported that Ca,Sr and Si [36]. This finding agreed with the work done by Hai Hao, [41]. Indicated that the addition of 1.5 wt% Sm with or without 0.8Si/Ca led to a decrease in the volume fraction of the β-Mg17Al12 Phase and the formation of the intermetallic compounds of Al-Sm, Mg2Si, MgAlCa and AL2Ca.…”

Section: Solute Additionssupporting

confidence: 87%

Grain Refinement OfAZ91MgCasAlloy (Review Paper)

Eljaafari

2023

International Journal of Materials Technology and Innovation

View full text Add to dashboard Cite

Grain refinement is an established technique that reduces the grain size of material with the direct intention of improving its finished properties or characteristic. The main objective of grain refinement is to produce a fine, uniform, and equiaxed grain structure. On the other hand, grain refinement of cast magnesium can be achieved by two methods represented by increasing the cooling rate and adding a chemical grain refiner. AZ91 is a cast magnesium alloy used to produce die-cast components. In contrast, the basic microstructure of this alloy consists of a primary αphase in which the aluminum-rich βphase (Mg17 Al12) is precipitated along grain boundaries in cast magnesium alloy. Cast AZ91 alloy generally exhibits low strength and ductility due to the network-like eutectic β-Mg17 Al12 distributed at the grain boundaries. In this review article, the research methods of grain refinement and its effect on the characterization of microstructure and mechanical properties of AZ91 magnesium cast alloy.

show abstract

Section: Solute Additionssupporting

confidence: 87%

Grain Refinement OfAZ91MgCasAlloy (Review Paper)

Eljaafari

2023

International Journal of Materials Technology and Innovation

View full text Add to dashboard Cite

show abstract

“…The elemental mapping (Figure 6) shows the composition and location of the main alloying elements found in the AZ91, namely Mg (Figure 6b), Al (Figure 6c), Si (Figure 6d), Mn (Figure 6e), and Zn (Figure 6f). The elemental mapping results agree well with the chemical composition of AZ91 (Table 1) and confirm the formation and location of the intermetallics throughout the whole material, indicating the structural homogeneity of the typical microstructure of the as-cast AZ91 [29,30].…”

Section: Microstructure Analysissupporting

confidence: 77%

“…intermetallics throughout the whole material, indicating the structural homogeneity of the typical microstructure of the as-cast AZ91 [29,30]. The dispersion of the short carbon fibers which reinforced the AZ91 matrix alloy to produce AZ91/23% carbon fiber composite was studied for the specimens machined in the parallel and normal directions to the reinforced plane (Figure 3) using SEM.…”

Section: Microstructure Analysismentioning

confidence: 99%

Microstructure and Mechanical Properties of AZ91 Rein-Forced with High Volume Fraction of Oriented Short Carbon Fibers

et al. 2022

View full text Add to dashboard Cite

In this study, AZ91/23 vol.% short carbon fiber composite was produced by a squeeze casting technique using a cylindrical pre-form of treated carbon fibers, in which the fibers are randomly oriented in the horizontal plane. Cylindrical specimens (height = 9 mm and diameter = 6 mm) were machined from the as-cast AZ91 matrix and its composite. The full behavior of the produced composite was studied through the test specimens machined in two directions, namely parallel to the reinforced plane (in the radial direction of the cast cylinder) and normal to the reinforced plane (in the axial direction of the cast composite). The microstructures of the produced composite specimens were investigated using SEM equipped with EDS analysis. Density, hardness, compressive, and wear behavior were also investigated. For comparison, the AZ91 matrix was evaluated as a reference. The microstructure of the produced AZ91 matrix alloy and its composite revealed dense materials without casting defects. Both composite specimens show improvement in hardness, compressive strength, and wear properties over the AZ91 matrix. The compressive and wear properties are more fiber orientation-dependent than the hardness results. The parallel composite specimen depicts the highest compressive properties in terms of yield compressive strength (311 MPa) and ultimate compressive strength (419 MPa), compared to that shown by the AZ91 matrix and the normal composite specimen. This improvement in compressive strength was at the expense of ductility. The parallel composite specimen shows the lowest ductility (R = 3.8%), compared to that given by the normal composite specimen (R = 7.1) and the AZ91 matrix alloy (R = 13.6). The wear testing results showed that at the highest wear load of 5 N, the material weight loss of the parallel composite specimen decreases by 44% and 64% compared to the AZ91 matrix and the normal composite specimen, respectively.

show abstract

“…One of the methods of improving the mechanical properties of the casts is intensive cooling of the moulds, which makes it possible to obtain a relative good microstructure, which, in consequence, improves the properties [7]. A inoculation of the microstructure of a cast obtained in the as-cast state can be achieved also as a result of introducing inoculants or alloy additions [8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Archives of Metallurgy and Materials

Mikusek,

Rapiejko,

Andrzejczak

et al. 2020

View full text Add to dashboard Cite

This paper presents results of a study of the effect of inoculation of yttrium on the microstructure of AZ91 alloy. The concentration of the inoculant was increased in samples in the range from 0.1% up to 0.6%. The influence of Y on the thermal effects resulting from the phase transformations occurring during the crystallisation at different inoculant concentrations were examined with the use of Derivative and Thermal Analysis (DTA). The microstructures of the samples were examined with the use of an optical microscope; and an image analysis with a statistical analysis were also carried out. Those analyses aimed at examining oh the effect of inoculation of the Y on the differences between the grain diameters of phase α Mg and eutectic α Mg + γ (Mg 17 Al 12 ) in the prepared examined material as well as the average size of each type of grain by way of measuring their perimeters.

show abstract

Microstructure and mechanical properties of AZ91 magnesium alloy with minor additions of Sm, Si and Ca elements

Abstract: Male, born in 1969, Ph.D., Professor. His research interests mainly focus on solidification control, casting technology of light metals and porous materials. He has published more than one hundred scientific and technical papers.

Cited by 23 publications

References 24 publications

Grain Refinement OfAZ91MgCasAlloy (Review Paper)

Grain Refinement OfAZ91MgCasAlloy (Review Paper)

Microstructure and Mechanical Properties of AZ91 Rein-Forced with High Volume Fraction of Oriented Short Carbon Fibers

Archives of Metallurgy and Materials

Contact Info

Product

Resources

About