Microstructural characterisation of Al–Si cast alloys containing rare earth additions

2018 ◽  
Vol 98 (15) ◽  
pp. 1337-1359 ◽  
Author(s):  
E. M. Elgallad ◽  
M. F. Ibrahim ◽  
H. W. Doty ◽  
F. H. Samuel
Keyword(s):  
Rare Earth ◽  
Cast Alloys ◽  
Rare Earth Additions ◽  
Microstructural Characterisation

Microstructure of Al3Sc with ternary rare-earth additions

2009 ◽  
Vol 17 (1-2) ◽  
pp. 17-24 ◽  
Author(s):  
Y. Harada ◽  
D.C. Dunand
Keyword(s):  
Rare Earth ◽  
Rare Earth Additions

Structure Maps and Phase Stability in AlTi3 Alloyed with Rare-Earth Elements

1988 ◽  
Vol 133 ◽  
Author(s):  
C. T. Liu ◽  
J. A. Horton ◽  
D. G. Petitifor
Keyword(s):  
Crystal Structure ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Solubility Limit ◽  
Size Factor ◽  
X Ray Diffraction ◽  
Atomic Size ◽  
X Ray ◽  
Dependent Parameter ◽  
Rare Earth Additions

ABSTRACTRare-earth elements including Y, Er and Sc were added to AlTi3 for stabilizing the Ll2 ordered crystal structure, as predicted by the AB3 structure map. The crystal structure and phase composition in the AlTi3 alloys were studied by electron microprobe analysis, X-ray diffraction and TEM. The solubility limit of the rare-earth elements were determined and correlated with the atomic size factor. The results obtained so far indicate that rare-earth additions are unable to change the crystal structure of AlTi3 from DO19 to Ll2. The inability to stabilize the Ll2 structure demonstrates the need to characterize the structure map domains with a further period-dependent parameter.

scholarly journals Microstructure and Hardness of Scandium Trialuminide with Ternary Rare-Earth Additions

2007 ◽  
Vol 539-543 ◽  
pp. 1565-1570 ◽  
Author(s):  
Yoshihisa Harada ◽  
David C. Dunand
Keyword(s):  
Solid Solution ◽  
Rare Earth ◽  
Lattice Parameter ◽  
Second Phase ◽  
Micro Hardness ◽  
Size Mismatch ◽  
Atomic Size ◽  
Rare Earth Additions ◽  
Re Elements ◽  
Vickers Micro Hardness

The microstructure of ternary Al3(Sc1-yREy) intermetallic compounds (where RE is one of the rare-earth elements La, Ce, Nd, Sm, Eu, Yb or Lu), was investigated as a function of RE concentration for 0<y≤0.75. Alloys with La, Ce, Nd, Sm or Eu additions consist of a L12 phase containing a dendritic second phase with D019 (La, Ce, Nd, Sm) or C11b (Eu) structure. Alloys with Yb or Lu additions show a single L12 phase. The RE solubility limits at 1373 K in the L12-Al3(Sc1-yREy) phase are very low for La, Nd, Ce and Eu (0.08-0.41 at.% or y=0.0032-0.0164), low for Sm (3.22 at.% or y=0.1288) and complete for Yb and Lu. The lattice parameter of the L12 solid-solution increases linearly with RE concentration and the magnitude of this effect is correlated with the atomic size mismatch between Sc and the RE elements. The Vickers micro-hardness of the L12 solid-solution increases linearly with increasing RE concentration.

Microstructure and mechanical properties of Mg–Al based alloy with calcium and rare earth additions

2003 ◽  
Vol 356 (1-2) ◽  
pp. 1-7 ◽  
Author(s):  
Du Wenwen ◽  
Sun Yangshan ◽  
Min Xuegang ◽  
Xue Feng ◽  
Zhu Min ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Rare Earth ◽  
Microstructure And Mechanical Properties ◽  
Rare Earth Additions

Magnetic Properties and Crystallography of Selected Co/Pt Multilayers with Rare-Earth Additions

1993 ◽  
Vol 313 ◽  
Author(s):  
G.A. Bertero ◽  
R.L. White ◽  
R. Sinclair
Keyword(s):  
Magnetic Properties ◽  
Rare Earth ◽  
Cross Section ◽  
Uniaxial Anisotropy ◽  
Amorphous Film ◽  
Perpendicular Anisotropy ◽  
Grain Sizes ◽  
Transmission Electron ◽  
Rare Earth Additions ◽  
Sputter Deposited

ABSTRACTWe have sputter-deposited a series of Pt/CO Multilayers with differing amounts of rare-earth (RE) in an effort to improve the uniaxial perpendicular anisotropy in these structures. The present work investigates the influence on the magnetic properties of Tb and Ho incorporated both at the interfaces of Pt/CO Multilayers and into the Co layers. The uniaxial anisotropy improved significantly only for those multilayers that showed poor perpendicular anisotropy in the undoped state, in particular, those with large (∼30 Å) bilayer periods. High resolution transmission electron microscopy was used to study these multilayers in cross-section. The Multilayer structures present strong [111] texture with grain sizes ranging from 200 to 600 Å. It is found that the RE does not produce a significant change in the growth texture of the multilayers until a critical amount is introduced beyond which the multilayer structure amorphizes resulting in a compositionally modulated amorphous film.

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