Achievements in Magnesium Alloy Research

Easton, Mark; Gibson, Mark; Zhu, Su Ming; Yang, Kun; Abbott, Trevor

doi:10.4028/www.scientific.net/MSF.828-829.3

Paper Titles

Preface

Achievements in Magnesium Alloy Research
p.3

Casting Development with a High Strength Aluminium Alloy
p.9

Challenges and Solutions in the Development of Magnesium Sheet for Sustainable Vehicle Concepts
p.15

Development of New Oxide Based Master Alloys and their Grain Refinement Potency in Aluminium Alloys
p.23

Thermal Stability of Al-Si-Cu-Mg Cast Alloys Modified with Transition Metals Zr, V and Ti
p.29

Twin-Roll Casting after Intensive Melt Shearing and Subsequent Rolling of an AM30 Magnesium Alloy with Addition of CaO and SiC
p.35

Controlling the Formation of Iron-Bearing Intermetallics in Wrought Al Alloys by Melt Conditioned DC (MC-DC) Casting Technology
p.43

Direct-Chill Casting of AA7449 Aerospace Alloy under Electromagnetic and Ultrasonic Combined Fields
p.48

Home Materials Science Forum Light Metals Technology 2015Achievements in Magnesium Alloy Research

Achievements in Magnesium Alloy Research

Abstract:

Research into magnesium die-cast alloys from the Mg-Al-(Zn), Mg-Zn-(Al), Mg-rare earth (RE) and Mg-Al-RE systems is discussed. Particular attention is paid to factors influencing mechanical properties and castability. The nature and level of alloy addition is in all cases an important determinant of castability (cracking and fluidity) and mechanical properties (strength, ductility and creep resistance). The interplay of these factors shows considerable variation between different alloy systems.

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Periodical:

Materials Science Forum (Volumes 828-829)

Main Theme:

Light Metals Technology 2015

Edited by:

H.K. Chikwanda and S. Chikosha

Pages:

3-8

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.828-829.3

Citation:

M. Easton et al., "Achievements in Magnesium Alloy Research", Materials Science Forum, Vols. 828-829, pp. 3-8, 2015

Online since:

August 2015

Authors:

Mark Easton, Mark Gibson, Su Ming Zhu, Kun Yang, Trevor Abbott

Keywords:

Castability, Magnesium Alloys, Mechanical Properties

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References

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Paper TitlePages

An Analysis of the Development and Applications of Current and New Mg-Al Based Elevated Temperature Magnesium Alloys

Authors: Ming Bo Yang, Fu Sheng Pan, Jing Zhang, Jin Zhang

Abstract: The current status of research and application in the AZ(Mg-Al-Zn), AS(Mg-Al-Si), AE(Mg-Al-RE), AX(Mg-Al-Ca), ACM or MRI（Mg-Al-Ca-RE）and AJ（Mg-Al-Sr）series elevated temperature magnesium alloys are reviewed, will special attention paid to the effects of alloying elements and the control of second phases. The existing problems on the development of elevated temperature magnesium alloys are discussed.

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Improved Heat and Corrosion Resistance of Mg-Al-Zn Alloys by Additions of Minor Alloying Elements

Authors: Jeong Min Kim, Bong Koo Park, Joong Hwan Jun, Ki Tae Kim, Woon Jae Jung

Abstract: Small amounts of minor alloying elements such as RE and Sr were added to Mg- 8wt%Al-5wt%Zn (AZ91D+4%Zn), and their effects on the microstructure, mechanical properties and corrosion resistance were investigated. The microstucture of the investigated alloys could be characterized by dendritic Mg, Mg17Al12, a quasi-crystalline Zn-rich phase, and Al4RE (if RE is added). Although the tensile strength of alloys was not improved, the creep strength was significantly enhanced by the additions of minor alloying elements. No apparent influence of the additions could be found on the corrosion resistance.

374

Microstructure, Mechanical Properties, Creep and Corrosion Resistance of Mg-Gd-Y-Zr(-Ca) Alloys

Authors: Shang Ming He, Xiao Qin Zeng, Li Ming Peng, Xin Wu Guo, Jian Wei Chang, Wen Jiang Ding

Abstract: The microstructure, mechanical properties, creep and corrosion resistance of Mg-Gd-Y-Zr(-Ca) alloys were studied. Small additions of 0.4-0.6 wt% Ca to Mg-(9-10)Gd-3Y-0.4Zr(wt.%) alloys led to a slight improvement in creep resistance and a remarkable increase in corrosion resistance, but an obvious decrease in elongation to fracture. UTS and TYS of the Mg-Gd-Y-Zr(-Ca) alloys are obviously higher than those of WE54, especially in the temperature range from room temperature to 200 oC. TEM images and corresponding energy dispersive x-ray spectra showed that the Ca element primarily segregated to the grain boundaries and existed in the cuboid-shaped particles with a trace concentration, and the small addition of Ca had no obvious effect on the orientation, morphology, and distribution of β′ phase, which is responsible for the peak hardness in Mg-Gd-Y-Zr alloys.

101

Effect of Magnesium and Artificial Aging on the Microstructure and Mechanical Properties of Al-Si-Mn-Mg Alloys

Authors: S.G. Shabestari, M.M. Hejazi, M. Bahramifar

Abstract: The effect of magnesium addition up to 0.9 wt.% on the microstructure and mechanical properties of Al-9Si-0.35Mn alloy has been investigated in both as-cast and heat treated conditions. Generally, Mg addition increases the heat treatability and strength of the alloys at the expense of the lower ductility. High levels of magnesium addition, causes the formation of large and brittle intermetallics, a slight increase in porosity and hence, a decrease in ultimate tensile strength and ductility of the cast alloys. T6 heat treatment increases the strength of the alloys up to 80 percent compared to as-cast samples. Among the studied compositions, heat treated Al-9Si-0.35Mn-0.25Mg alloy, has the maximum value of quality index and can be regarded as a promising material with the optimum mechanical properties for industrial applications.

415

Influence of Yttrium and Heat Treatment on Microstructure and Mechanical Properties of AM60 Alloy

Authors: Zheng Tian, Zhan Yi Cao, Jian Meng

Abstract: The effect of yttrium addition and heat treatment on the mechanical properties and microstructure of AM60 magnesium alloy have been investigated using X-ray phase analysis, microstructure investigation, tensile test, hardness measurement and fracture surfaces analysis. The results showed that the mechanical properties of the alloys were obviously improved with the addition of yttrium no more than 1.0%. The reinforcement of the alloys resulted from the appearance of Al₂Y phase. After solid-solution treatment (T4), the Mg₁₇Al₁₂ phase almost dissolved in Mg matrix, but the rare earth compounds Al₂Y phase was rather stable. The ultimate tensile strength σb was improved, but the yield strength σ_0.2 and elongation δ were only slightly changed. After solid-solution + aging treatment (T6), the Mg₁₇Al₁₂ phase precipitated again and their morphology was changed. The yield strength σ_0.2 was improved.

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