Grain Refinement of AZ91 Magnesium Alloy Induced by Al-V-B Master Alloy

Chang, Wang; Shen, Yiming; Su, Yueying; Zhao, Long; Zhang, Yunhu; Chen, Xiangru; Sun, Ming; Dai, Jichun; Zhai, Qijie

doi:10.3390/met9121333

Cited by 9 publications

(6 citation statements)

References 38 publications

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“…Modification of a Mg-Nd-Zr alloys with silver and gold, described in this article, makes it possible to increase the volume fraction of intermetallic phases by ~1.5 times, shifting them towards smaller size groups, with the simultaneous formation of spherical intermetallic compounds located in the center of the grains and acting as additional crystallization centers. The obtained results as to the refinement of the microstructure of the alloy are consistent with studies carried out by other authors [35].…”

Section: Monthssupporting

confidence: 91%

Influence of Noble Metals on the Microstructure and Properties of Biodegradable Mg-Nd-Zr Alloy

Greshta,

Shalomeev,

Bovkun

et al. 2023

Applied Sciences

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In this work, the approach to improve the mechanical properties of a biodegradable Mg-Nd-Zr alloy through modification with noble metals (Ag and Au) was proposed. The separate and combined influence of silver and gold on the macro- and microstructure of the alloy was studied. A qualitative and quantitative assessment of the structural components of the alloy was carried out. It was shown that when modifying the melt, noble metals form the complex intermetallic phases which served as additional crystallization centers. It has been established that adding 0.05 to 0.1 wt.% of noble metals to Mg-based alloy increase the volume fraction of intermetallic compounds by ~1.5 times, shifting them towards smaller size groups with the simultaneous formation of spherical intermetallic compounds. The latter are located in the center of the grain proving them to be the additional nucleation sites. It was shown that complex modification (0.1% Ag + 0.1% Au) of a Mg-based alloy refined its structural components by ~1.5 times, increasing the strength by ~20%, and ductility by ~2 times due to the formation of the intermetallic compounds. The proposed technology for modifying cast biodegradable Mg-based alloys is feasible to be used for the manufacture of implants for osteosynthesis.

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Section: Monthssupporting

confidence: 91%

Influence of Noble Metals on the Microstructure and Properties of Biodegradable Mg-Nd-Zr Alloy

Greshta,

Shalomeev,

Bovkun

et al. 2023

Applied Sciences

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“…According to the American Society for Testing and Materials ASTM, magnesium alloys are classified [2]. Magnesium alloy is called "green engineering materials" [3].…”

Section: Mg and Mg-alloysmentioning

confidence: 99%

“…These alloys have a 1.624 c/a ratio with a hexagonal close-packed (hcp) lattice structure [4]. Due to their low density of 1.74 g/cm 3 , which is 35% lighter than aluminum's 2.7 g/cm 3 and almost five times lighter than steel's 7.9 g/cm 3 , as well as their good castability, thermal conductivity, high electromagnetic shielding characteristics, good die casting, weldability, good mechanical properties, and excellent recyclability they have always been appealing to designers [5-6-7-8-9].…”

Section: Mg and Mg-alloysmentioning

confidence: 99%

Grain Refinement OfAZ91MgCasAlloy (Review Paper)

Eljaafari

2023

International Journal of Materials Technology and Innovation

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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.

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“…However, the grain refinement approach with zirconium [4], which is commonly used for non-Al-containing Mg alloys, does not work for this AZ Metals 2024, 14, 485 2 of 11 alloy family due to the formation of an AlZr intermetallic phase, which is ineffective for the grain refinement of Mg alloys [1]. Other grain refinement methodologies (i.e., rapid cooling, melt superheating, carbon inoculation [5][6][7], the addition of Al-Ti-C [8], B [9], Al-V-B master alloy [10], CaO [11], MgO [12,13], SiC [14], VN [15], Mg 3 N 2 [16][17][18], AlN [19], TiB 2 [20], Ca [21], the application of ultrasonic treatment [22]) have therefore been widely investigated, with a focus on the effect of particles on the grain restriction factor [23][24][25][26] and dendritic grain growth [27] as well as phase growth [28,29]. However, rapid cooling may not be a viable option for particular castings, while superheating uses extra energy and increases the oxidation of the melt.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Duration of Action of Mg3N2 as a Grain Refiner for AZ80 Alloy

Hösele,

Neunteufl,

2024

Metals

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In magnesium alloys with aluminum as an alloying component, zirconium loses its grain refinement effect as a grain refiner. Instead of zirconium, Mg3N2 can be used, and promising results have already been obtained. However, the duration of action of Mg3N2 has not been elucidated yet. The aim of this work is therefore to determine the grain size of the AZ80 alloy as a function of the duration of action of Mg3N2 and thus the economically reasonable duration of use. It was found that the Mg3N2 reaches its full effect from 30 min after a complete remelting and does not lose this grain refinement effect even after 90 min. It thus proves to be a stable and reliable grain refiner. A grain size of 146.3 ± 10.3 µm was achieved. Furthermore, a minimum tensile strength of 205 MPa with a break elongation of 5.99% was achieved.

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Grain Refinement of AZ91 Magnesium Alloy Induced by Al-V-B Master Alloy

Cited by 9 publications

References 38 publications

Influence of Noble Metals on the Microstructure and Properties of Biodegradable Mg-Nd-Zr Alloy

Influence of Noble Metals on the Microstructure and Properties of Biodegradable Mg-Nd-Zr Alloy

Grain Refinement OfAZ91MgCasAlloy (Review Paper)

Investigation on the Duration of Action of Mg3N2 as a Grain Refiner for AZ80 Alloy

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