scholarly journals Intermetallic compounds and choice of alloying elements for the manufacture of thixomolded creepresistant magnesium alloys

2007 ◽  
Vol 43 (1) ◽  
pp. 85-97 ◽  
Author(s):  
V. Goryany ◽  
P.J. Mauk
Keyword(s):  
Intermetallic Compounds ◽  
Magnesium Alloys ◽  
Rare Earths ◽  
State Of The Art ◽  
Mg Alloys ◽  
Alloying Elements ◽  
Service Properties ◽  
Viable Solution ◽  
Production Problems

This study aims at finding ways to improve the service properties of state-of-the-art creepresistant Mg alloys for Thixomolding and minimise production problems. In doing so, microalloying with Si, Zn, Sr, Li, C, Ba and Bi, as well as the addition of rare earths is a viable solution. .

The Influence of Ge on the Properties of Mg Alloys

2015 ◽  
Vol 647 ◽  
pp. 72-78 ◽  
Author(s):  
Jan Šerák ◽  
Tomáš Kovalčík ◽  
Dalibor Vojtěch ◽  
Pavel Novák
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Ambient Temperature ◽  
Magnesium Alloys ◽  
Elevated Temperatures ◽  
Small Extent ◽  
Mg Alloys ◽  
Alloying Elements ◽  
Combustion Engines ◽  
Thermal Stability Of

Germanium is an element which is used in metallurgy in a very small extent. Much more significant is its use as a semiconductor material. Most of magnesium alloys are usually used for applications at ambient temperature. The significant decrease in mechanical properties is observed already at the temperature higher than 150°C. This is the reason for the effort to prepare a new low-priced magnesium based alloys with improved mechanical properties at elevated temperatures, e.g. for components of combustion engines. Therefore, new unconventional alloying elements are studied for increase the thermal stability of magnesium alloys. The effect of germanium on the microstructure and mechanical properties of Mg-Ge alloys at ambient and elevated temperatures was studied in this paper.

scholarly journals Alloying Elements of Magnesium Alloys: A Literature Review

2021 ◽  
Author(s):  
Nouha Loukil
Keyword(s):  
Mechanical Properties ◽  
Rare Earth ◽  
Magnesium Alloys ◽  
Clinical Applications ◽  
Mg Alloys ◽  
Alloying Elements ◽  
Strengthening Mechanisms ◽  
Corrosion Properties ◽  
Lightweight Structures ◽  
Re Elements

Magnesium alloys are the lightest structural metal. The lightness is the main reason for the interest for Mg in various industrial and clinical applications, in which lightweight structures are in high demand. Recent research and developments on magnesium Mg alloys are reviewed. A particular attention is focused on binary and ternary Mg alloys consisting mainly of Al, Zn, Mn, Ca and rare earth (RE) elements. The effects of different alloying elements on the microstructure, the mechanical and the corrosion properties of Mg alloys are described. Alloying induces modifications of the microstructural characteristics leading to strengthening mechanisms, improving then the ductility and the mechanical properties of pure Mg.

Effects of Al, Zn, and rare earth elements on flammability of magnesium alloys subjected to sonic burner–generated flame by Federal Aviation Administration standards

2021 ◽  
pp. 095441002098775
Author(s):  
Guangjian Wang ◽  
Zhiwei Zhao ◽  
Song Zhang ◽  
Lili Zheng
Keyword(s):  
Rare Earth ◽  
Oxide Film ◽  
Rare Earths ◽  
Ignition Time ◽  
Federal Aviation Administration ◽  
Mg Alloys ◽  
Alloying Elements ◽  
Mg Alloy ◽  
Protective Oxide ◽  
Protective Oxide Film

Mg alloys are promising structural materials in aerospace industry due to high strength to weight ratio. However, most Mg alloys are limited in aircraft cabins due to their susceptibility to ignition and burning. To improve fire resistance, adding alloying elements is a strategy. Thus, the goal of this study is to explore the effects of alloying elements Al, Zn, and rare earths on Mg-alloy flammability by experiment, using the system and procedures in compliance with the Federal Aviation Administration (FAA) standards for Mg-alloy flammability test. Six commercial Mg alloys with different alloying elements (AZ91E, ZK61A, ZE63A, EZ33A, WE43B, and EV31A) were tested. Results indicate that Mg alloys with Al or Zn elements were of short ignition time and high weight loss. With rare earths, Mg-alloy flammability was suppressed obviously. It appears that this suppression effect with rare earth addition was attributed to the formation of protective oxide film on the surface of molten alloy. Further, a heat transfer model was established to analyze the temperature evolution of the test specimen subjected to the sonic burner–generated flame by FAA standards, and ignition temperatures of all testing Mg alloys were predicted based on the experimental ignition time. The predicted results confirm that with rare earths addition, ignition was delayed after melting by the protective oxide film formed on the surface of the molten alloy.

scholarly journals Superplasticity at Intermediate Temperatures of ZK60 Magnesium Alloy Processed by Indirect Extrusion

Metals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 606
Author(s):  
César Palacios-Trujillo ◽  
José Victoria-Hernández ◽  
David Hernández-Silva ◽  
Dietmar Letzig ◽  
Marco A. García-Bernal
Keyword(s):  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
Deformation Mechanism ◽  
Extrusion Direction ◽  
Grain Boundary Sliding ◽  
Mg Alloys ◽  
Homogeneous Microstructure ◽  
Texture Measurement ◽  
Average Grain Size ◽  
Zk60 Magnesium Alloy

Magnesium alloys usually exhibit excellent superplasticity at high temperature. However, many Mg alloys have poor formation ability near room temperature. Therefore, preparation of Mg alloys with suitable microstructures to show low or intermediate temperature superplasticity is an important goal. In this work, the superplastic behavior at intermediate temperatures of a commercial ZK60 magnesium alloy processed by indirect extrusion was investigated. After extrusion, the alloy showed a refined and homogeneous microstructure with an average grain size of 4 ± 2 μm. Overall texture measurement indicated that the alloy showed a strong prismatic texture with the highest intensity oriented to pole ⟨101¯0⟩. A texture component ⟨1¯21¯1⟩ parallel to the extrusion direction was found; this type of texture is commonly observed in Mg alloys with rare earth additions. Tensile tests were performed at temperatures of 150, 200, and 250 °C at three strain rates of 10−2, 10−3, and 10−4 s−1. A very high ductility was found at 250 °C and 10−4 s−1, resulting in an elongation to failure of 464%. Based on calculations of the activation energy and on interpretation of the deformation mechanism map for magnesium alloys, it was concluded that grain boundary sliding (GBS) is the dominant deformation mechanism.

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

2008 ◽  
Vol 58 (10) ◽  
pp. 894-897 ◽  
Author(s):  
Yuanding Huang ◽  
Hajo Dieringa ◽  
Norbert Hort ◽  
Tarek Abu Leil ◽  
Karl Ulrich Kainer ◽  
...  
Keyword(s):  
Magnesium Alloys ◽  
Alloying Elements ◽  
Creep Response

Friction Stir Welding of Dissimilar Formed Mg Alloys (AZ31/AZ91)

2005 ◽  
Vol 486-487 ◽  
pp. 249-252 ◽  
Author(s):  
Chang Yong Lee ◽  
Won Bae Lee ◽  
Yun Mo Yeon ◽  
Seung Boo Jung
Keyword(s):  
Friction Stir Welding ◽  
Dynamic Recrystallization ◽  
Tensile Test ◽  
Intermetallic Compounds ◽  
Grain Growth ◽  
Weld Zone ◽  
Mg Alloys ◽  
Mg Alloy ◽  
Friction Stir ◽  
Az31 Mg Alloy

Friction stir welding of dissimilar formed Mg alloys(AZ31/AZ91) was successfully carried out at the limited welding conditions. In a sound joint, SZ was mainly consisted of AZ31 Mg alloy which was located the retreating side. Dynamic recrystallization and grain growth occurred and β intermetallic compounds of AZ 91 Mg alloy was not observed in SZ. BM had a higher hardness than that of the weld zone. The fracture location was not weld zone but BM of the AZ91 Mg alloy in tensile test.

scholarly journals Role of alloying elements on twin growth and twin transmission in magnesium alloys

2017 ◽  
Vol 706 ◽  
pp. 295-303 ◽  
Author(s):  
M. Arul Kumar ◽  
I.J. Beyerlein ◽  
R.A. Lebensohn ◽  
C.N. Tomé
Keyword(s):  
Magnesium Alloys ◽  
Alloying Elements ◽  
Twin Growth

Study of Thermal Stability of Magnesium Alloys

2013 ◽  
Vol 690-693 ◽  
pp. 74-77
Author(s):  
Zuzana Turnova ◽  
Tomas Chrebet ◽  
Ivana Turekova ◽  
Karol Balog
Keyword(s):  
Thermal Stability ◽  
Chemical Composition ◽  
Magnesium Alloys ◽  
Ignition Temperature ◽  
Structural Materials ◽  
Mg Alloys ◽  
Muffle Furnace ◽  
Dynamic Heating ◽  
Thermal Stability Of

Today, magnesium (Mg) alloys are recognized alternatives to iron and aluminum to reduce the weight of structural materials. This contribution was performed to provide information on the flammability of magnesium alloys through investigation of the ignition temperature of selected Mg alloys. The test was performed in a muffle furnace with dynamic heating program. Also were performed tests of chemical composition of studied specimens.

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