Effects of segregation of primary alloying elements on the creep response in magnesium alloys

This paper reviews the outcome of bismuth and antimony trappings on the microstructure and mechanical behavior of an assortment of commercial magnesium alloys. Various compositions of the Bi and Sb were discussed along with/without combination of other alloying elements. These additions have revealed to be resulted in the formation of Mg3Bi2 , Mg3Sb2 intermediate phases when added upon with corresponding alloying elements. Moreover the reasons for the observed changes due to the addition of these alloying elements were also reviewed. It is found that the accumulation of Bi phase as well as intermetallics and Sb intermediates has greatly improved the microstructure belonging to the as cast magnesium alloys thereby improving both mechanical and thermo-mechanical properties. It is also observed in the review that addition of thesealloying elements acted as grain refiner and improved the corrosion resistance of commercial magnesium alloys.

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AZ31 and WE43 Alloys for Biomedical Applications

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.270.205 ◽

2017 ◽

Vol 270 ◽

pp. 205-211 ◽

Cited By ~ 2

Author(s):

Drahomír Dvorský ◽

Jiří Kubásek ◽

Dalibor Vojtěch

Keyword(s):

Mechanical Properties ◽

Magnesium Alloys ◽

Biomedical Applications ◽

Intermetallic Phases ◽

Alloying Elements ◽

Biodegradable Implants ◽

Preparation Process ◽

Magnesium Matrix ◽

Corrosion Properties ◽

Mechanical And Corrosion Properties

Magnesium and its alloys are considered for application as materials for biodegradable implants as they have mechanical properties similar to bone tissue. High demands on corrosion and mechanical properties are made on these alloys. While mechanical properties of magnesium are usually enhanced by alloying, corrosion properties may deteriorate. This paper is focused on the comparison of magnesium alloys AZ31 (3 wt. % Al, 1 wt. % Zn) and WE43 (4 wt. % Y, 3 wt. % Nd) which are considered for biomedical applications. Besides the type of alloying elements, the preparation process has also great impact on final mechanical and corrosion properties. Alloying elements may be dissolved in magnesium matrix or they can form intermetallic phases, which alter final properties. Microstructure, mechanical and corrosion properties of AZ31 and WE43 were studied and compared with pure magnesium.

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Corrosion Properties of Supersaturated Magnesium Alloy Systems

Materials Science Forum ◽

10.4028/www.scientific.net/msf.539-543.1679 ◽

2007 ◽

Vol 539-543 ◽

pp. 1679-1684 ◽

Cited By ~ 11

Author(s):

Carsten Blawert ◽

V. Heitmann ◽

Wolfgang Dietzel ◽

M. Störmer ◽

Y. Bohne ◽

...

Keyword(s):

Magnesium Alloys ◽

Electrochemical Impedance ◽

Ion Beam ◽

Alloying Elements ◽

Pvd Coatings ◽

Corrosion Properties ◽

Cast Material ◽

Linear Polarization Resistance ◽

Melting Temperatures ◽

Alloy Systems

The range of applications for magnesium alloys is still limited due to their relatively poor corrosion behavior. In recent years, various new magnesium alloys were developed, some of them with improved corrosion properties, thus opening new fields of application. However, the number of alloying elements for the use in conventional cast processes is limited due to their interaction with liquid magnesium, other alloying elements or large differences in the melting temperatures. The possibilities for grain refinement by post-processing are also restricted. PVD techniques can help to produce supersaturated precipitation free and microcrystalline magnesium layers. Using ion beam and magnetron sputtering, binary or ternary Mg-Al, Mg-Ti and Mg-Sn alloy systems as well as standard alloys (AM50, AZ91 and AE42) were deposited on silicon and on magnesium substrates. The effect of the microstructure on the corrosion properties was studied by comparing as cast material and PVD coatings using potentiodynamic polarization, linear polarization resistance, and electrochemical impedance techniques.

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Effect of additional alloying elements on mechanical properties of magnesium alloys with rare earth metals

Magnesium Alloys Containing Rare Earth Metals ◽

10.1201/9781482265163-64 ◽

2003 ◽

pp. 190-195

Keyword(s):

Mechanical Properties ◽

Rare Earth ◽

Magnesium Alloys ◽

Rare Earth Metals ◽

Alloying Elements

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Effect of Microstructural Inhomogeneity on Creep Response of Mg-Sn Alloys

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.345-346.561 ◽

2007 ◽

Vol 345-346 ◽

pp. 561-564 ◽

Cited By ~ 14

Author(s):

Yuan Ding Huang ◽

Norbert Hort ◽

Tarek Abu Leil ◽

Karl Ulrich Kainer ◽

Yi Lin Liu

Keyword(s):

Magnesium Alloys ◽

Volume Fraction ◽

Microstructural Analysis ◽

Creep Property ◽

Grain Boundary Sliding ◽

Creep Response ◽

Large Volume Fraction ◽

Microstructural Inhomogeneity ◽

Intermetallic Precipitates ◽

Boundary Sliding

The development of new creep resistant magnesium alloys has become a major issue in recent years. The alloys investigated in the present work are based on the binary system Mg-Sn. Sn as major alloying element was chosen due to its high solid solubility over a wide temperature range and due to the possible formation of Mg2Sn intermetallic precipitates with a high melting temperature of about 770°C. These characteristics suggest that a fairly large volume fraction of thermally stable Mg2Sn particles can be formed during solidification. This makes it possible that the Mg-Sn alloys can be developed as creep resistant magnesium alloys. In fact, previous investigations indicate that the Mg-Sn alloys have a comparable or even better creep property than AE42 alloy. The present work investigates the microstructure of Mg-Sn alloys with and without creep deformation using SEM and TEM technique. The effects of microstructural inhomogeneity on the creep response are presented. Based on the microstructural analysis, the mechanism responsible for improving the creep resistance will be discussed. It is shown that the grain boundary sliding is a dominant creep mechanism for the Mg-Sn binary alloy.

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