A Study on Al-Mg Alloy Foams by Melt Foaming Method

2007 ◽  
Vol 124-126 ◽  
pp. 1841-1844
Author(s):  
Yeong Hwan Song ◽  
Soo Han Park ◽  
Sang Youl Kim ◽  
Chang Hwan Seo ◽  
Bo Young Hur
Keyword(s):  
Compression Test ◽  
Magnesium Content ◽  
Gradual Decrease ◽  
Mg Alloys ◽  
Mg Alloy ◽  
Compressive Properties ◽  
Pore Structures ◽  
Al Mg Alloys

Al-Mg alloy foams were synthesized via conventional melt foaming method. Ca and TiH2 were introduced into molten Al-Mg alloys with different magnesium contents. The macrostructures of resultant alloy foams were analyzed and correlated with compressive properties estimated by compression test. It is shown that the pore structures observed in alloy foams degraded with increasing Mg contents. This tendency was shown to be consistent with compressive characteristics of corresponding alloy foams. In detail, plateau strength was high for Al-1wt%Mg alloy foams, exhibiting a gradual decrease in plateau strength with increasing magnesium content.

Effect of magnesium content on thermal and structural parameters of Al–Mg alloys directionally solidified

2010 ◽  
Vol 45 (9) ◽  
pp. 2285-2295 ◽  
Author(s):  
Jean Robert Pereira Rodrigues ◽  
Mirian de Lourdes Noronha Motta Melo ◽  
Rezende Gomes dos Santos
Keyword(s):  
Structural Parameters ◽  
Magnesium Content ◽  
Mg Alloys ◽  
Directionally Solidified ◽  
Al Mg Alloys

CW CO2 Laser Welding of Al-Mg Alloys with Filler Wires

2008 ◽  
Vol 580-582 ◽  
pp. 539-542 ◽  
Author(s):  
Jong Won Yoon ◽  
E.R. Wallach
Keyword(s):  
Weld Metal ◽  
Mg Alloys ◽  
Solidification Cracking ◽  
Solidification Structure ◽  
Mg Alloy ◽  
Weld Strength ◽  
Laser Welds ◽  
Equiaxed Grains ◽  
Mg Content ◽  
Al Mg Alloys

The CW CO2 laser weldability of various Al-Mg alloys was investigated in terms of weld strength, ductility, Vickers hardness, formability and solidification cracking tendency when both autogenous and wire feed welding were made. Tensile strength of the laser welds was lower than that of the corresponding base metals, and it was linearly proportional to the Mg content of the weld metal. Formability and ductility of Al-Mg alloy laser welds were lower than those of corresponding base alloys as well. As for the weld solidification structure, as the Mg content increased in the weld metal, more equiaxed grains developed. Hence, softening of weld metal and solidification cracking were decreased in the weld metal containing higher Mg. Solidification cracking of Al-Mg alloy laser welds showed the highest susceptibility at 1.6 to 1.9wt.% Mg, and it decreased with further increase of Mg content.

EFFECTS OF La, MISCH METAL ADDITIONS ON ROLLING TEXTURE IN HIGH Mg CONTENT Al-Mg ALLOYS

2006 ◽  
Vol 20 (25n27) ◽  
pp. 4040-4045
Author(s):  
SU-DONG PARK ◽  
HEE-WOONG LEE ◽  
BONG-SEO KIM ◽  
NO-JIN PARK
Keyword(s):  
Rolling Texture ◽  
Mechanical Twinning ◽  
Mg Alloys ◽  
Mg Alloy ◽  
Misch Metal ◽  
Goss Orientation ◽  
Metal Addition ◽  
Mg Content ◽  
Al Mg Alloys

In the present works, the change of a rolling texture by La or Mm (Misch metal) addition in high Mg content (>5wt%) Al - Mg alloy was investigated. By Mm addition, B (Brass) orientation {011} 〈112〉 was typically developed with Mg contents and it was accelerated by La , Mm additions. TC (twin copper) orientation {255} 〈511〉 and G (Goss) orientation {110} 〈001〉 orientations closely related mechanical twinning were decreased in intensity and development of coarsen share bend was suppressed by Mm addition in Al -10wt% Mg alloy. And it caused improvement of formability by Mm addition in high Mg content Al - Mg alloy.

Infiltration of Al-Mg Alloy into SiC Preform in the Production of Metal Matrix Composites by Pressureless Infiltration

2001 ◽  
Vol 702 ◽  
Author(s):  
A. Zulfia ◽  
R.J. Hand
Keyword(s):  
Sessile Drop ◽  
Mg Alloys ◽  
Mg Alloy ◽  
Nitride Phase ◽  
Matrix Composites ◽  
Infiltration Process ◽  
Ceramic Preform ◽  
Al Matrix Composites ◽  
Al Mg Alloys ◽  
Ceramic Reinforcement

ABSTRACTMolten Al-Mg alloys has been infiltrated into SiC to produce Al matrix composites at 900oC for different infiltration times under N2. The wettability of the ceramic reinforcement by the Al-Mg alloy is crucial in determining whether Al can be infiltrated into ceramic preform. Sessile drop results showed that Al alloys with Mg contents greater than 8wt-% had a contact angle lower than 90o, after 5 minutes contact time, this was associated with the infiltration of Al-Mg alloys into SiC preform occurred after 30 minutes. Sessile drop experiments also show that SiC is similarly wetted by Al-Mg alloys under N2. It is concluded that the infiltration process does not involve the intermediate nitride phase suggested by other authors. These materials were also charaterised both mechanical properties and microstructure.

MECHANICAL PROPERTIES OF HIGH STRENGTH Al-Mg ALLOY SHEET

2009 ◽  
Vol 23 (06n07) ◽  
pp. 843-848 ◽  
Author(s):  
BONG-JAE CHOI ◽  
KYUNG-EUI HONG ◽  
YOUNG-JIG KIM
Keyword(s):  
Mechanical Properties ◽  
High Strength ◽  
Alloy Sheet ◽  
Mg Alloys ◽  
Alloying Elements ◽  
Mg Alloy ◽  
Al Alloy ◽  
Calphad Approach ◽  
Automotive Body ◽  
Al Mg Alloys

The aim of this research is to develop the high strength Al alloy sheet for the automotive body. For the fabrication Al - Mg alloy sheet, the composition of alloying elements was designed by the properties database and CALPHAD (Calculation Phase Diagram) approach which can predict the phases during solidification using thermodynamic database. Al - Mg alloys were designed using CALPHAD approach according to the high content of Mg with minor alloying elements. After phase predictions by CALPHAD, designed Al - Mg alloys were manufactured. Addition of Mg in Al melts were protected by dry air/Sulphur hexafluoride (SF6) mixture gas which can control the severe Mg ignition and oxidation. After rolling procedure of manufactured Al - Mg alloys, mechanical properties were examined with the variation of the heat treatment conditions.

Morphology of Dispersoids in an Annealed Al-Mg Alloys

2021 ◽  
Vol 1035 ◽  
pp. 72-82
Author(s):  
Xiao Ling Xiao ◽  
Hong Wei Liu ◽  
Wen Long Chen ◽  
Yi Ming Lin
Keyword(s):  
Phase Diagram ◽  
Minimum Energy ◽  
Unit Cell ◽  
Mg Alloys ◽  
Mg Alloy ◽  
Tetragonal Structure ◽  
Formation Mechanisms ◽  
Annealed Alloy ◽  
Orientation Domain ◽  
Al Mg Alloys

Morphology of dispersoids in an annealed Al-Mg alloy were investigated using TEM. Five kinds of dispersoids with different structures and morphologies were observed in an annealed Al-Mg alloy. The 1st, or spherical-like one is monoclinic structured θ-Al45(Mn,Cr)7 phase with twin and orientation domain. The 2nd or plate-shaped one is η-Al5(Mn,Cr) phase with monoclinic or pesuo-tetragonal structure. The 3rd or prismatic-like one is a new hexagonal structured Al6.4Mn phase with a unit cell of a=1.72nm, c=1.27nm, and γ=120°, and the 4th or big rod-shaped one is orthorhombic structured Al6(Mn,Fe) phase which is often reported. The 5th one is E-Al18Mg3(Mn–Cr)2 phase with twin or triple twin observed occasionally in Al-Mg annealed alloy. The first two of dispersoids are in majority, followed by the middle two and a small number of the fifth. Formation mechanisms of these particles in Al-Mg alloy are discussed according to phase diagram and possible formation of the twins in the particles are described based on minimum energy.

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