Effects of specimen aspect ratio on the compressive properties of Mg alloy foam

2012 ◽  
Vol 42 ◽  
pp. 32-36 ◽  
Author(s):  
Xingchuan Xia ◽  
Weimin Zhao ◽  
Zhihao Wei ◽  
Zhiguo Wang
Keyword(s):  
Aspect Ratio ◽  
Mg Alloy ◽  
Compressive Properties

Correlation between Zirconium Addition and Compressive Properties of AZ31 Mg Alloy Foams

2011 ◽  
Vol 121-126 ◽  
pp. 75-79
Author(s):  
Bo Young Hur ◽  
Rui Zhao
Keyword(s):  
Mechanical Properties ◽  
Energy Absorption ◽  
Mg Alloy ◽  
Compressive Properties ◽  
Absorption Properties ◽  
Compression Behavior ◽  
Foaming Agent ◽  
Az31 Mg Alloy ◽  
Absorption Characteristics ◽  
Zirconium Addition

The compressive behaviors of AZ31-Zr foams using Ca particles as thickening agent and CaCO3 powder as foaming agent were investigated in this study. The porosity was about 48.7%~72.9%, pore size was between 0.43~0.97 mm, and homogenous pore structures were obtained. Mechanical properties of AZ31 Mg alloy foams were investigated by means of UTM. The cellular AZ31 Mg foams possess superior comprehensive mechanical properties. The energy absorption characteristics and the effects of compression behavior on the energy absorption properties for the cellular AZ31 Mg foams have been investigated and discussed. The results show that with the addition of Zr, the Mg alloy foam has the highest energy absorption value of 16.26 MJ/m3 and the hardness value of 81.8 HV, which is much higher than that of the foams fabricated without Zr.

Compressive properties of bulk metallic glass with small aspect ratio

2007 ◽  
Vol 22 (2) ◽  
pp. 501-507 ◽  
Author(s):  
F.F. Wu ◽  
Z.F. Zhang ◽  
S.X. Mao
Keyword(s):  
Plastic Deformation ◽  
Aspect Ratio ◽  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Deformation Behavior ◽  
Shear Bands ◽  
Compressive Load ◽  
Small Aspect Ratio ◽  
Compressive Properties ◽  
Deformation Ability

The quasi-static compressive deformation behavior of a Vitreloy 1 bulk metallic glass (BMG) with an aspect ratio of 0.25 was investigated. It is found that the friction and the confinement at the specimen–loading platen interface will cause the dramatic increase in the compressive load, leading to higher compressive strength. In particular, the BMG specimens show great plastic-deformation ability, and plenty of interacted, deflected, wavy, or branched shear bands were observed on the surfaces after plastic deformation. The formation of the strongly interacted, deflected, wavy, or branched shear bands can be attributed to the triaxial stress state in the glassy specimens with a very small aspect ratio.

A Study on Morphologies of Second Phases in the Mg-Sr and Mg-Sr-Y Alloys

2010 ◽  
Vol 146-147 ◽  
pp. 336-339
Author(s):  
Jing Gao ◽  
Hai Cheng Yu ◽  
Fang Fang Zhao ◽  
Ming Hu
Keyword(s):  
Aspect Ratio ◽  
Reduction Method ◽  
Mg Alloy ◽  
Heat Resistant ◽  
Second Phases ◽  
Micro Structures

In this paper, the author successfully fabricated Mg-Sr and Mg-Sr-Y alloys by melting-leaching reduction method using SF6 and N2 as protected gas. The micro-structures of the alloys were investigated in details，and the results showed that dendrite α-Mg and eutectic α-Mg and Mg17Sr2 were the main phases in the Mg-Sr alloy, while Mg -Sr-Y alloys were composed of dendrite α-Mg and small eutectic α-Mg and Mg17Sr2 and tiny Mg24Y5. More eutectics were distributed around dendrite crystals in the Mg-Sr alloy, the Mg17Sr2 with aspect ratio of 6 : 1 were aligned and discontinuous lamellae, a Mg17Sr2 was irregular particles. The microstructures of Mg-Sr-Y alloy refined, Mg17Sr2 and tiny Mg24Y5 particles with size of 2-3μm distributed in the α-Mg dendrites and boundaries. The fomation and growth of both Mg24Y5 and Mg17Sr2 in the alloys were stated. It is obvious that the role of improving the heat-resistant Mg alloy of Mg24Y5 is more than Mg17Sr2.

Effects of cell size on quasi-static compressive properties of Mg alloy foams

2012 ◽  
Vol 34 ◽  
pp. 40-44 ◽  
Author(s):  
Z.G. Xu ◽  
J.W. Fu ◽  
T.J. Luo ◽  
Y.S. Yang
Keyword(s):  
Cell Size ◽  
Mg Alloy ◽  
Compressive Properties

THE OPTIMIZING CONDITIONS BY TAGUCHI METHOD FOR FABRICATING SEMI-SOLID Al–Zn–Mg ALLOY SLURRY BY COOLING PLATE METHOD

2010 ◽  
Vol 17 (02) ◽  
pp. 185-188 ◽  
Author(s):  
SUNG-YONG SHIM ◽  
HYUNG-WON PARK ◽  
IN-SANG JEONG ◽  
SU-GUN LIM
Keyword(s):  
Grain Size ◽  
Aspect Ratio ◽  
Design Method ◽  
Solid Material ◽  
Mg Alloy ◽  
Image Analyzer ◽  
Pouring Temperature ◽  
Plate Method ◽  
Cooling Plate ◽  
Semi Solid

In order to optimize the condition for the semi-solid Al–Zn–Mg aluminium alloy fabricated by cooling plate method, the Taguchi design was used. The cooling plate method effectively separating the grains formed from the mold wall can be used to form a semi-solid material by flowing molten metal over an inclined Cu plate and casting in a mold for the near-net shape component. In Taguchi's design method, the higher signal vs noise (S/N) ratio the better. Therefore, the manufacturing conditions were arranged as a table of orthogonal arrays (L9(34)), and the influence of two factors, pouring temperature and cooling plate angle, was examined. From the observed microstructures, the grain size and aspect ratio were measured by image analyzer. The results indicated that the pouring temperature exerts the main effect on the spherical microstructures since the S/N ratio, which is the sensibility of the surrounding environment, was the highest. The optimum condition for the Al–Zn–Mg alloy was a cooling plate angle of 40° and a pouring temperature of 680°C. The grain size and aspect ratio were 70 μm and 1.3, respectively.

scholarly journals Test method development and determination of three-dimensional stiffness properties of polyvinyl chloride structural foams

2017 ◽  
Vol 52 (5) ◽  
pp. 679-688 ◽  
Author(s):  
Akira Miyase ◽  
Su Su Wang
Keyword(s):  
Aspect Ratio ◽  
Polyvinyl Chloride ◽  
Three Dimensional ◽  
Transversely Isotropic ◽  
Gage Section ◽  
Test Method ◽  
Compressive Properties ◽  
Stiffness Properties ◽  
Significant Difference ◽  
Out Of Plane

A study has been conducted to develop proper test methods and to utilize the tests to evaluate three-dimensional mechanical behavior of a polyvinyl chloride structural foam (Divinycell H80 with nominal density of 80 kg/m3). Transversely isotropic foam microstructure was examined and it revealed that the cell size aspect ratio in in-plane directions was near unity but greater than one in the out-of-plane (rise) direction. Foam stiffness properties, i.e. moduli and Poisson’s ratios, were obtained in different loading modes, along both in-plane and out-of-plane directions. The influence of test specimen geometry on compressive properties was studied. Foam specimens with both straight-side and reduced gage sections were designed, fabricated and tested. The effect of specimen gage-section aspect ratio was identified as a critical geometric parameter, affecting foam compressive properties. For foam tensile properties, specimens with different cross-sectional dimensions in the gage section were used. The results revealed transversely isotropic characteristics of the foam material. To evaluate foam shear properties a scaled shear test method was developed. The results indicated a significant difference in in-plane and out-of-plane foam shear stiffness properties.

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 homogenizing heat treatment on the compressive properties of closed-cell Mg alloy foams

2013 ◽  
Vol 49 ◽  
pp. 19-24 ◽  
Author(s):  
Xingchuan Xia ◽  
Weimin Zhao ◽  
Xiangzheng Feng ◽  
Hui Feng ◽  
Xin Zhang
Keyword(s):  
Heat Treatment ◽  
Mg Alloy ◽  
Compressive Properties ◽  
Closed Cell
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