magnesium alloy grain structure

Investigation of Mechanical Properties and Grain Structure of …

composition of Al 5xxx alloy having 92.47 % of Al and 6.46% of Mg in the form of rod produced by extrusion process. The correlation of mechanical properties with grain structure is established in the study. Index Terms- 5xxx series alloy, Al-Mg

Effect of grain refinement on the microstructure, dendrite coherency and porosity of AZ91E magnesium alloy

Figure 2. AZ91 magnesium alloy microstructure showing (a) the equiaxed grain structure and (b) the hexagonal dendritic morphology revealed by coring within a grain [11]. ..4 Figure 3. Segregation of thin oxide skin in an AZ91 alloy at 375X

Processing of magnesium alloys with ultrafine grain …

The mechanism of grain refinement in magnesium alloys deformed at moderate temperatures differs from that observed in other metals such as copper and aluminum. Fine grains nucleate along

Mechanical Properties, Disloion Density and Grain …

2007/4/11· The microstructure of the AlMg2 alloy after eight ECAP passes is shown in Figure 2. Due to the higher Mg content, large recrystallized grains are absent. However, pronounced shear bands are found in the alloy, consisting of elongated grains eedded into a rather equiaxed grain structure.

(PDF) Producing Ultrafine Grain Structure in AZ91 …

Producing Ultrafine Grain Structure in AZ91 Magnesium Alloy Cast by Rapid Solidifiion.pdf Available via license: CC BY-NC-ND 3.0 Content may be subject to …

Effect of magnesium on strength and microstructure of Aluminium Copper Magnesium alloy

magnesium increases in the alloy, the average values of the dendrite arm spacing and grain size decreased, results in a fine and uniform grain structure as shown in micrographs. Also it found influence of heat treatment reduces both grain size and DAS when a

Structure and Properties Investigation of MCMgAl12Zn1 Magnesium Alloy …

Structure and Properties Investigation of MCMgAl12Zn1 Magnesium Alloy L.A. Dobrzański*, M. Król Institute of Engineering Materials and Biomaterials, Silesian University of Technology, Konarskiego 18A, 44-100 Gliwice, Poland * Corresponding author. E-mail

Microstructure and Properties of Casting Magnesium …

2018/11/5· In as-cast condition, EV31A alloy is characterized by a solid solution structure α-Mg with eutectic α-Mg + Mg 3 (Nd, Gd) intermetallic phase on grain boundaries. Depending on the aging temperature and time, the decomposition of α-Mg supersaturated solid solution is as follows: α-Mg → β″ → β′ → β(Mg 3 RE) → Mg 41 Nd 5 [ 11 ].

Magnesium alloy - Wikipedia

2015/12/1· Mixed grain structure is a usual phenomenon in wrought magnesium alloy products, and its main reason is uneven or incomplete dynamic recrystallization (DRX) [2−4]. During hot deformation of magnesium alloys, DRX is the most important grain refinement mechanism [5−9].

(PDF) Structure and properties of AZ31 magnesium …

Alloy structure after the fourth pass of ECAP tool with helix matrix 30 shows a fine-grained structure with average grain size of 2 µm to 3 µm and high disorientation between the grains. More

Semisolid Magnesium Feedstock Produced by Controlled Nucleation …

In magnesium alloy AZ91, the wall crystal mechanism promoted by low temperature pouring was effective. Cooling rate was less effective, at least in the low superheat material, at producing a finer structure, however it led to a more globular grain morphology. A very

Structure and properties of aluminium–magnesium …

2016/9/21· Precipitation treatment leads to the disappearance of dendritic structure and has no significant impact on the grain size and their morphology (Fig. 3). It is clear that during the precipitation treatment process from supersaturated solid solution precipitate the hardening secondary phases β ′ -Al 3 Mg 2 which are uniformly distributed in the matrix of the alloy.

Grain Growth Model of Ultra-Fine Grain AZ80 Magnesium Alloy …

grain AZ80 magnesium alloy of an average grain size of 0.73 μm. When ultra-fine grain AZ80 magnesium alloy is isothermally heated at 673K, its average grain size grows continuously as time extends.

GRAIN REFINEMENT OF MAGNESIUM ALLOY AZ91E

master alloy for AZ91E Mg alloys. When the Al-SiC master alloy was added to molten AZ91E alloy, the Al matrix melted and allowed the SiC particles to distribute …

E Properties of AZ91 Magnesium Alloy - MDPI

2020/6/24· Primary grain size is one of the elementary structural criteria in evaluation of the quality of cast magnesium alloys. Grain refinement results in improvement of mechanical properties of the alloy, e.g., wear resistance and corrosion resistance [1–3]. Cooling rate is

Grain Refinement of Magnesium Alloy by Multiaxial Alternative Forging and Hydrogenation Treatment

For magnesium materials, the effect of fine-grained structure on the static mechanical properties, fatigue, and fracture toughness has been investigated to study their practical applicability(Nagata et al,2007). Such investigations are very importan t for increasing the use of magnesium alloys as industrial materials (Noda et al, 2009).

Strengthening Mechanisms of Magnesium-Lithium …

Magnesium alloyed with lithium above ~17 at.% Li (5.5 wt.%) makes the hexagonal-close-packed (HCP) structure. Mg-Li alloys change to a duplex structure mixed with both HCP and body-centered-cubic (BCC) phases simultaneously. Above ~31 at.%

Microstructure, Texture and Mechanical Properties of …

The grain refinement and tiled texture are attributed to the excellent strength and ductility of HSRFed alloys with full recrystallized structure. As the accumulated strain is ΣΔε = 0.88, the HSRFed alloy displays an outstanding coination of mechanical properties, the ultimate tensile strength (UTS) is 331.2 MPa and the elongation is 25.1%.

Effect of Grain Refinement on Tensile Ductility in ZK60 …

Abstract. Magnesium alloys are generally brittle owing to their HCP structure. In this study, improvement of tensile mechanical properties under dynamic loading has been demonstrated for a pure magnesium and a ZK60 magnesium alloy.

Achieving fine grain structure and superplasticity in AZ91 …

2017/5/17· Accordingly, via 3 rolling passes HPCR process, it is quite efficient to obtain a uniform fine grain structure, together with the formation of near-spherical Mg 17 Al 12 particles, which is believed to be beneficial in promoting formability of the hard-to-deform AZ91-0

Mechanical Properties, Disloion Density and Grain …

2007/4/11· The kind and amount of alloying elements strongly affects the formation of ultrafine-grained microstructures. Aluminum alloys with different amounts of the alloying element magnesium, and a commercially pure aluminum alloy, have been investigated in order to evaluate how the obtained microstructures will affect the mechanical properties. X-ray profile analysis has been used to determine grain

Processing of magnesium alloys with ultrafine grain …

The mechanism of grain refinement in magnesium alloys deformed at moderate temperatures differs from that observed in other metals such as copper and aluminum. Fine grains nucleate along pre-existing grain boundaries in a necklace pattern in coarse-grained magnesium while homogeneous nucleation of fine grains is observed in fine-grained.

Effect of grain refinement on the microstructure, dendrite …

Figure 2. AZ91 magnesium alloy microstructure showing (a) the equiaxed grain structure and (b) the hexagonal dendritic morphology revealed by coring within a grain [11]. ..4 Figure 3. Segregation of thin oxide skin in an AZ91 alloy at 375X

Observations on the control of grain size in magnesium casting …

The methods investigated for the control of grain size in magnesium casting alloys were (1) stirring of carbonaceous solids into the molten alloy, (2) bubbling of carbon monoxide through the melt, (3) melting in a silicon carbide crucible, and (4) treatment with lump

Effect of magnesium on strength and microstructure of Aluminium Copper Magnesium alloy

magnesium increases in the alloy, the average values of the dendrite arm spacing and grain size decreased, results in a fine and uniform grain structure as shown in micrographs. Also it found influence of heat treatment reduces both grain size and DAS when a

(PDF) High Pressure Die Casting of Aluminium and …

The magnesium alloys are designated by an alphanumerical code; the first letter of the two major alloy constituents and their respective amounts describes the alloys: AluminiumManganese6%0.5%. The character B, (as in AM60B), refers to the composition ranges, and unless otherwise stated, AM60=AM60B in the thesis.

(PDF) Structure and properties of AZ31 magnesium …

Alloy structure after the fourth pass of ECAP tool with helix matrix 30 shows a fine-grained structure with average grain size of 2 µm to 3 µm and high disorientation between the grains. More

Influence of ultra-fine grain structure on corrosion behaviour of biodegradable Mg-1Ca alloy

Firstly, magnesium can be alloyed with different species [3–5]. Secondly, the alloy mi- crostructure can be refined to obtain ultra-fine or nanoscale grain size [6–8]. In this study, both these