A Brief Review about Surface Treatment of Magnesium Alloys

2012 ◽  
Vol 724 ◽  
pp. 307-310 ◽  
Author(s):  
Yu Bai ◽  
Fang Li Yu ◽  
Jun Du ◽  
Wen Xian Wang ◽  
Ze Qin Cui ◽  
...  
Keyword(s):  
Magnesium Alloys ◽  
Protective Coatings ◽  
Corrosion And Wear ◽  
New Materials ◽  
Paper Briefly ◽  
Effective Protection ◽  
Widespread Application ◽  
Specific Strength ◽  
Aerospace Applications ◽  
High Specific Strength

Due to the low density and high specific strength, magnesium and its alloys have been extensively used in the automobile and aerospace applications, where the weight reduction is critical. However, they are highly prone to corrosion, which has greatly limited their application in the automotive and aerospace industries. This paper briefly reviews the technologies for improving the corrosion and wear resistance of magnesium alloys and finds that the widespread application of magnesium alloys is still limited by the lack of proper protective coatings. Therefore, there is still a need to explore new materials and methods for the effective protection of magnesium and its alloys.

Effect of Sn Content on Heat Resistance of Mg-3%Al-1%Si Alloy for Casting

2018 ◽  
Vol 941 ◽  
pp. 1071-1076
Author(s):  
Seiji Saikawa ◽  
Manabu Mizutani ◽  
Nozomu Kawabe
Keyword(s):  
Magnesium Alloys ◽  
Optical Microscope ◽  
Permanent Mold ◽  
Power Train ◽  
Suitable Material ◽  
Specific Strength ◽  
Heat Resistant ◽  
High Specific Strength ◽  
Mold Casting ◽  
Mobile Industry

Magnesium alloys have the characteristic with high specific strength and lightweight property, it is widely used for auto mobile industry. Heat-resistant magnesium alloy is focused as a suitable material for weight reduction of the engine and power train parts in automotive field. In this study, microstructure and heat-resistant property in Mg-3mass%Al-1mass%Si (Mg-3%Al-1%Si) alloy with containing large amount of Sn (tin) were investigated. The alloys produced by permanent mold casting were investigated by optical microscope (OM), scanning electron microscopy (SEM) and measuring of bolt load retention at 423K. The heat-resistant property of Mg-3mass % Al-1mass % Si alloy with containing 6-13masss%Sn was higher compared with Sn free alloy and conventional Magnesium alloys (e.g. AZ91 and AM60 alloys).

An Experimental Investigation Into the High Speed Turning of Ti-6Al-4V Titanium Alloy

2010 ◽  
Author(s):  
Anil K. Srivastava ◽  
Jon Iverson
Keyword(s):  
Titanium Alloy ◽  
Titanium Alloys ◽  
High Speed ◽  
Elevated Temperatures ◽  
Chemical Reactivity ◽  
Specific Strength ◽  
Aerospace Applications ◽  
Layered Coatings ◽  
High Specific Strength ◽  
Cutting Speeds

Titanium and its alloys have seen increased utilization in military and aerospace applications due to combination of high specific strength, toughness, corrosion resistance, elevated-temperature performance and compatibility with polymer composite materials. Titanium alloys are difficult to machine due to their inherent low thermal conductivity and higher chemical reactivity with other materials at elevated temperatures. In general, temperature related machining difficulties are encountered at production speeds in the range of 60 m/min and high-speed machining of these alloys has created considerable interest to researchers, tool manufacturers and end users. This paper provides recent results obtained during turning operation with the aim of improving machinability of titanium alloys. Several tests have been conducted using (i) micro-edge prep geometry of the inserts, (ii) ultra-hard PVD coated, and (iii) nano-layered coated inserts and the effects of speeds and feeds during turning of Ti-6Al-4V titanium alloy are discussed. The initial tests have been conducted under orthogonal (2-D) cutting conditions with no coolant application. Based on these results, several oblique cutting (3-D) tests have been designed and conducted to study the effect of various types of ultra-hard and nano-layered coatings at higher cutting speeds under flooded coolant conditions. The effects of speed and feed on cutting force and tool wear are presented in this paper.

Wear Resistant Polymer Matrix Composites for Aerospace Applications

2004 ◽  
Author(s):  
Subhash K. Naik ◽  
James K. Sutter ◽  
Widen Tabakoff ◽  
Robert G. Siefker ◽  
Harold S. Haller ◽  
...  
Keyword(s):  
Polymer Matrix ◽  
Polymer Matrix Composites ◽  
Matrix Composites ◽  
Maintenance Costs ◽  
Specific Strength ◽  
Aerospace Applications ◽  
High Specific Strength ◽  
Test Conditions ◽  
Sand Erosion ◽  
Engine Components

Polymer matrix composites (PMCs) are attractive for use in propulsion engine components due to their high specific strength. The use of composites could be even more advantageous if the sand erosion life of the component were extended, thereby reducing maintenance costs. NASA Glenn Research Center (NASA GRC) and Rolls-Royce Corporation have developed erosion resistant coatings that can extend PMC component life and are applicable to current available and advanced high temperature PMCs. This paper describes the performance of SANPRES and SANRES, two similar erosion resistant coating systems that were subjected to engine test conditions on Rolls-Royce AE 3007 engine bypass vanes.

Study of Grain Refinement and SiC Nanoparticle Reinforced Magnesium Alloys

2005 ◽  
Vol 488-489 ◽  
pp. 889-892 ◽  
Author(s):  
Zhao Hui Wang ◽  
Yong Lin Kang ◽  
Wenchao Dong ◽  
Hongjin Zhao ◽  
Jin Wei Liu ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Grain Refinement ◽  
Magnesium Alloys ◽  
Sic Nanoparticles ◽  
Specific Strength ◽  
High Specific Strength ◽  
Refinement Process ◽  
Reinforced Process ◽  
Strength And Ductility

Magnesium alloys offer advantages of low density, high specific strength, machinability and availability. So it has been used more and more in many fields, such as automobile, communication etc. In this paper, grain refinement process and SiC nanoparticles reinforcement process are investigated for the purposes of increasing ultimate tensile strengthen and ductility of AM60B magnesium alloys. We find that after grain refinement process the ultimate tensile strength of AM60B alloys with permanent casting increase to 241MPa, which is about 27MPa higher than that of original alloys, and the elongation of it increases up to 20.1%, which is about 8.7% higher than that of original alloys. We added SiC nanoparticle into AM60B alloys in liquid state and found it could increase strength and ductility of alloys. By SiC nanoparticle reinforced process the ultimate tensile strength of magnesium alloys can increase up to 255MPa with the elongation of 19%.

scholarly journals Promising Methods for Corrosion Protection of Magnesium Alloys in the Case of Mg-Al, Mg-Mn-Ce and Mg-Zn-Zr: A Recent Progress Review

Metals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1133
Author(s):  
Pavel Predko ◽  
Dragan Rajnovic ◽  
Maria Luisa Grilli ◽  
Bogdan O. Postolnyi ◽  
Vjaceslavs Zemcenkovs ◽  
...  
Keyword(s):  
Magnesium Alloys ◽  
Corrosion Protection ◽  
Recent Progress ◽  
Protective Coatings ◽  
Chemical Reactivity ◽  
Short Review ◽  
Industrial Applications ◽  
Organic Polymer ◽  
Multilayer Systems ◽  
Specific Strength

High specific strength characteristics make magnesium alloys widely demanded in many industrial applications such as aviation, astronautics, military, automotive, bio-medicine, energy, etc. However, the high chemical reactivity of magnesium alloys significantly limits their applicability in aggressive environments. Therefore, the development of effective technology for corrosion protection is an urgent task to ensure the use of magnesium-containing structures in various fields of application. The present paper is aimed to provide a short review of recent achievements in corrosion protection of magnesium alloys, both surface treatments and coatings, with particular focus on Mg-Al-Mn-Ce, Mg-Al-Zn-Mn and Mg-Zn-Zr alloys, because of their wide application in the transport industry. Recent progress was made during the last decade in the development of protective coatings (metals, ceramics, organic/polymer, both single layers and multilayer systems) fabricated by different deposition techniques such as anodization, physical vapour deposition, laser processes and plasma electrolytic oxidation.

Studies on Notch Tensile Properties of Ti-5Al-2.5Sn ELI at Cryogenic Temperature for Hydrogen Embrittlement Effect

2018 ◽  
Vol 877 ◽  
pp. 39-43
Author(s):  
T. Antony Prabhu ◽  
N. Murugesan ◽  
S. Ingersol ◽  
D.P. Sudhakar ◽  
P.V. Venkitakrishnan
Keyword(s):  
Tensile Strength ◽  
Hydrogen Embrittlement ◽  
Tensile Properties ◽  
Coefficient Of Thermal Expansion ◽  
Cryogenic Temperatures ◽  
Specific Strength ◽  
Good Corrosion Resistance ◽  
Aerospace Applications ◽  
High Specific Strength ◽  
Interstitial Elements

Ti-5Al-2.5Sn alloy is widely used in aerospace applications due to its high specific strength, low coefficient of thermal expansion and good corrosion resistance. Presence of interstitial elements in the alloy has some significant effects on its properties. However the high notch toughness and cryogenic ductility attracts the usage of Ti-5Al-2.5Sn for usage at cryogenic temperatures even at 20K. For hydrogen embrittlement studies and for investigating notch sensitivity of Ti-5Al-2.5Sn alloy, the notched and smooth specimens from ELI grade of Ti-5Al-2.5Sn alloy were subjected to LH2exposure and tensile test at 20K (-253°C) and at 77K (-196°C). The tensile properties obtained from different specimens were compared and analyzed. Also the notch to smooth tensile strength ratio (NSR) were compared and analysed. The obtained NSR was above unity which confirms the low notch brittleness. The tensile strength values between LH2exposed and unexposed specimen at 20K and 77K were compared and it revealed greater compatibility of Ti-5Al-2.5Sn-ELI with liquid hydrogen environment.

Methods for Prevention of Ignition during Machining of Magnesium Alloys

2010 ◽  
Vol 447-448 ◽  
pp. 150-154 ◽  
Author(s):  
Jun Zhan Hou ◽  
Wei Zhou ◽  
Ning Zhao
Keyword(s):  
Magnesium Alloys ◽  
Cutting Speed ◽  
Cutting Parameters ◽  
Depth Of Cut ◽  
Machining Parameters ◽  
Specific Strength ◽  
Microelectronic Devices ◽  
High Specific Strength ◽  
Cut Depth ◽  
Cutting Speeds

Magnesium alloys have been increasingly used in automotive and aerospace components and in portable microelectronic devices due to their “ultralightness” and high specific strength. Machining is an important method used to process magnesium alloys. The advantages of machining over other processing methods such as die casting include reduction in power consumption and excellent surface finish. However, the ignition of chips presents a dangerous problem during machining. This problem has attracted considerable research interests. Though coolants can be used effectively to prevent ignition, the pollution of environment and reclamation of chips can not be resolved easily. Therefore, one better approach is to control the machining parameters for minimizing ignition hazard of magnesium alloy chips during dry machining. A systematic study was conducted for a few different magnesium alloys (including AM50A and AZ91D) to understand effect of cutting parameters (cutting speed, feedrate and depth of cut) on ignition of chips during face milling. It is interesting to find that for any fixed cut depth ignition in the forms of sparks, flares or ring of fire occurs only in the moderate cutting speeds and feedrates and can thus be easily prevented by adopting either higher or lower cutting speeds or feedrates. Chips produced in different machining conditions were collected and their morphology was analyzed to understand mechanisms of ignition.

scholarly journals Development of a High Strength Magnesium Alloy for Wire Arc Additive Manufacturing

Metals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 778
Author(s):  
Stefan Gneiger ◽  
Johannes A. Österreicher ◽  
Aurel R. Arnoldt ◽  
Alois Birgmann ◽  
Martin Fehlbier
Keyword(s):  
Additive Manufacturing ◽  
Magnesium Alloys ◽  
High Strength ◽  
Manufacturing Processes ◽  
Rare Earth Alloy ◽  
Specific Strength ◽  
High Specific Strength ◽  
Material Utilization ◽  
Wire Arc Additive Manufacturing ◽  
Specific Part

Due to their high specific strength, magnesium alloys are promising materials for further lightweighting in mobility applications. In contrast to casting and forming processes, additive manufacturing methods allow high degrees of geometrical freedom and can generate significant weight reductions due to load-specific part design. In wire arc additive manufacturing processes, large parts can be produced with high material utilization. Process-inherent high melt temperatures and solidification rates allow for the use of magnesium alloys which are otherwise complicated to process; this enables the use of unconventional alloying systems. Here, we report the development of a Mg-Al-Zn-Ca-rare earth alloy for wire arc additive manufacturing (WAAM). Compared to parts made of commercially available filler wire, the newly developed alloy achieves a higher strength (approx. +9 MPa yield strength, +25 MPa ultimate tensile strength) in WAAM.

Finite Element Analysis of the Forging Process of Magnesium Wheels

2007 ◽  
Vol 345-346 ◽  
pp. 1079-1084
Author(s):  
Zi Hui Xia ◽  
Feng Ju
Keyword(s):  
Finite Element ◽  
Magnesium Alloys ◽  
Working Condition ◽  
Forming Process ◽  
Element Analysis ◽  
Forging Process ◽  
Specific Strength ◽  
High Specific Strength ◽  
Final Deformation ◽  
Critical Consideration

The high specific strength of the magnesium alloy makes it a valuable choice for automotive, aerospace and sporting industries, where the weight reduction is a critical consideration in design. However, wrought magnesium alloys offer a poor formability at room temperature and a hot working condition is required for the forming process. This paper studies the application of finite element methods for the simulation of the forging of magnesium alloys. Numerical analysis of the forging process of an automotive magnesium wheel is conducted based on the tested flow curve of AZ80. The effect of friction on the final deformation of the upsetting of magnesium billets is also discussed.

A New Periodic Cellular Metal With Kagome Trusses and Its Performance

Aerospace ◽  
2006 ◽  
Author(s):  
Yong-Hyun Lee ◽  
Ji-Eun Choi ◽  
Ki-Ju Kang
Keyword(s):  
Raw Materials ◽  
Future Market ◽  
New Materials ◽  
Specific Strength ◽  
Cellular Metal ◽  
High Specific Strength ◽  
New Type ◽  
Strength And Stiffness ◽  
Metal Wires ◽  
Very High

Periodic cellular metals (PCM), especially truss PCM's seem promising as new materials in 21 century. Various works have been performed for the mechanical and thermal performance. However, only a number of papers have been published regarding fabrication techniques of PCM, even though the techniques should determine whether PCM's is survived in the future market, or not. In this work a new type of PCM with Kagome trusses is presented. Continuous metal wires as the raw materials are assembled in six directions with least deflection, which gives very high specific strength and stiffness. The mechanical behavior under compression and bending of hand-made specimens is presented. Also, the benefits and features are discussed.

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