Variations of thermal conductivity with temperature and composition of Zn in the Bi–[x]at.% Zn–2at.% Al alloys

2012 ◽  
Vol 547 ◽  
pp. 1-5 ◽  
Author(s):  
S. Aksöz ◽  
N. Maraşlı ◽  
K. Keşlioğlu ◽  
F. Yıldız
Keyword(s):  
Thermal Conductivity ◽  
Al Alloys

The Influence of Rare Earth, Strontium and Calcium on the Thermal Diffusivity of Mg-Al Alloys

2011 ◽  
Vol 312-315 ◽  
pp. 824-829 ◽  
Author(s):  
Tomasz Rzychoń ◽  
Andrzej Kiełbus
Keyword(s):  
Thermal Conductivity ◽  
Solid Solution ◽  
Rare Earth ◽  
Thermal Diffusivity ◽  
Magnesium Alloy ◽  
Aluminum Content ◽  
Volume Fraction ◽  
Al Alloys ◽  
Mg17al12 Phase ◽  
Increasing Temperature

The microstructure and thermal diffusivity of as-cast AM60, AE63, AJ63 and AXJ620 alloys were investigated over the temperature range 20–300°C. The microstructure of as-cast AM60 magnesium alloy consists of dendrites of α-Mg solid solution and divorced eutectic containing “islands” of α-Mg and Mg17Al12 phase. In regions adjacent with divorced eutectic, the supersaturation aluminum solute in the α-Mg matrix is observed. The addition of rare earth, calcium and strontium caused the decrease of the volume fraction of Mg17Al12 compound and aluminum content in α-Mg solid solution. Moreover, the intermetallic compounds such as: Al11RE3, Al4Sr, Al3Mg13Sr, Al2Ca are observed in the interdendritic regions. The thermal diffusivity of AM60 magnesium alloy increases with increasing temperature up to 150°C, above this temperature the increase is less marked. The change in the slope of the temperature variation of the thermal diffusivity is caused by a precipitation of Mg17Al12 phase in the supersaturation of α-Mg areas neighboring the divorced eutectic α-Mg+Mg17Al12. The addition of rare earth, calcium and strontium caused the increase of the thermal diffusivity and thermal conductivity due to the decreasing of aluminum content in α-Mg matrix.

ANALISIS KEKUATAN TARIK LOGAM PADUAN Al-Cu-Mg SEBAGAI DUDUKAN SHOCK ABSORBER SEPEDA MOTOR

2020 ◽  
Vol 8 (2) ◽  
pp. 67-72
Author(s):  
Riri Sadiana ◽  
Deni Putra ◽  
Wahyu Hidayat
Keyword(s):  
Thermal Conductivity ◽  
Tensile Strength ◽  
Aluminum Alloy ◽  
Magnesium Alloys ◽  
Shock Absorber ◽  
Ferrous Metal ◽  
Research Process ◽  
Al Alloys ◽  
Alloy Material ◽  
Swing Arm

Aluminum is a non-ferrous metal that has good thermal conductivity and is widely used in various mechanical machinery systems. Efforts to obtain additional mechanical strength from aluminum can be combined with Cu, Mg, Si, Mn, Ni and so on. This research was made to prepare a Motorcycle Shock Absorber that is useful as a pedestal and handle shock breakers against the swing arm, with aluminum alloy material (Al), copper (Cu), and magnesium (Mg). The purpose of this research is to know the tensile strength and know the value of the strain. The method of this research process is aluminum alloy with a variation of Specimen 1 ratio is 3% copper and 7% magnesium, for Specimen 2 replacement is 5% copper and 5% magnesium, and the variations that support Specimen 3 are 7% copper and 3% magnesium. From the results of this study, the tensile strength and strain values ​​obtained in specimen 1 were 125.5 MPa and 3.56%. For specimen 2 the tensile strength and strain values ​​were 150 Mpa and 3.42%. While the specimens of 100% tensile strength and strain are 137 Mpa and 7.48%. The best results from copper and magnesium alloys are Al alloys of 90%, Cu 5% and Mg 5%, with a tensile strength value of 150 MPa and a strain value of 3.42%.

Depth profile reconstruction of the thermal conductivity of inhomogeneous solids: application to laser-hardened Al alloys

2000 ◽  
Vol 71 (3) ◽  
pp. 319-323 ◽  
Author(s):  
Y.Z. Zhao ◽  
S.Y. Zhang ◽  
J.C. Cheng ◽  
Y.K. Zhang ◽  
W.H. Xu
Keyword(s):  
Thermal Conductivity ◽  
Depth Profile ◽  
Al Alloys ◽  
Profile Reconstruction

Thermal conductivity of as-cast and as-extruded binary Mg–Al alloys

2014 ◽  
Vol 608 ◽  
pp. 19-24 ◽  
Author(s):  
T. Ying ◽  
M.Y. Zheng ◽  
Z.T. Li ◽  
X.G. Qiao
Keyword(s):  
Thermal Conductivity ◽  
Al Alloys

Determination of thermal diffusivity and thermal conductivity of Mg–Al alloys

2003 ◽  
Vol 341 (1-2) ◽  
pp. 152-157 ◽  
Author(s):  
A. Rudajevová ◽  
M. Staněk ◽  
P. Lukáč
Keyword(s):  
Thermal Conductivity ◽  
Thermal Diffusivity ◽  
Al Alloys

Observation of faint contrast at planar faults in alloys

1978 ◽  
Vol 36 (1) ◽  
pp. 340-341
Author(s):  
K. Kuroda ◽  
Y. Tomokiyo ◽  
T. Kumano ◽  
T. Eguchi
Keyword(s):  
Reciprocal Lattice ◽  
Beam Theory ◽  
Al Alloys ◽  
Small Displacement ◽  
Electron Microscopic ◽  
Lattice Vector ◽  
Fringe Contrast ◽  
Planar Fault ◽  
Lattice Displacement ◽  
The Many

The contrast in electron microscopic images of planar faults in a crystal is characterized by a phase factor , where is the reciprocal lattice vector of the operating reflection, and the lattice displacement due to the fault under consideration. Within the two-beam theory a planar fault with an integer value of is invisible, but a detectable contrast is expected when the many-beam dynamical effect is not negligibly small. A weak fringe contrast is also expected when differs slightly from an integer owing to an additional small displacement of the lattice across the fault. These faint contrasts are termed as many-beam contrasts in the former case, and as ε fringe contrasts in the latter. In the present work stacking faults in Cu-Al alloys and antiphase boundaries (APB) in CuZn, FeCo and Fe-Al alloys were observed under such conditions as mentioned above, and the results were compared with the image profiles of the faults calculated in the systematic ten-beam approximation.

Microstructure of an extruded rapidly solidified Al-8Fe-2Mo alloy

1986 ◽  
Vol 44 ◽  
pp. 548-549
Author(s):  
W. T. Donlon ◽  
J. E. Allison ◽  
S. Shinozaki
Keyword(s):  
Electron Microscopy ◽  
Automotive Industry ◽  
Fuel Economy ◽  
High Strength ◽  
Al Alloys ◽  
Light Weight ◽  
Thin Sections ◽  
Strength And Durability ◽  
Rapidly Solidified ◽  
Whitney Aircraft

Light weight materials which possess high strength and durability are being utilized by the automotive industry to increase fuel economy. Rapidly solidified (RS) Al alloys are currently being extensively studied for this purpose. In this investigation the microstructure of an extruded Al-8Fe-2Mo alloy, produced by Pratt & Whitney Aircraft, Goverment Products Div. was examined in a JE0L 2000FX AEM. Both electropolished thin sections, and extraction replicas were examined to characterize this material. The consolidation procedure for producing this material included a 9:1 extrusion at 340°C followed by a 16:1 extrusion at 400°C, utilizing RS powders which have also been characterized utilizing electron microscopy.

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