Character of microplastic deformations in polycrystalline alloys strengthened by electromechanical processing

1996 ◽  
Vol 31 (1) ◽  
pp. 131-133
Author(s):  
G. V. Malovechko ◽  
N. G. Dudkina ◽  
A. Yu. Svitachev
Keyword(s):  
Polycrystalline Alloys

TEM study of order, structure and defects of β and martensite in Cu-Al-Mn shape memory alloys

1990 ◽  
Vol 48 (4) ◽  
pp. 188-189
Author(s):  
J.M. Guilemany ◽  
F. Peregrin
Keyword(s):  
Shape Memory ◽  
Orthophosphoric Acid ◽  
Isopropyl Alcohol ◽  
Metastable Phase ◽  
Characteristic Temperature ◽  
Ethanol Solution ◽  
Order Structure ◽  
Thin Foils ◽  
Polycrystalline Alloys ◽  
Diamond Saw

The shape memory effect (SME) shown by Cu-Al-Mn alloys stems from the thermoelastic martensitic transformation occuring between a β (L2,) metastable phase and a martensitic phase. The TEM study of both phases in single and polycrystalline Cu-Al-Mn alloys give us greater knowledge of the structure, order and defects.The alloys were obtained by vacuum melting of Cu, Al and Mn and single crystals were obtained from polycrystalline alloys using a modified Bridgman method. Four different alloys were used with (e/a) ranging from 1.41 to 1.46 . Two different heat treatments were used and the alloys also underwent thermal cycling throughout their characteristic temperature range -Ms, Mf, As, Af-. The specimens were cut using a low speed diamond saw and discs were mechanically thinned to 100 μm and then ion milled to perforation at 4 kV. Some thin foils were also prepared by twin-jet electropolishing, using a (1:10:50:50) urea: isopropyl alcohol: orthophosphoric acid: ethanol solution at 20°C. The foils were examinated on a TEM operated at 200 kV.

Large magnetocaloric effect and excellent mechanical properties near room temperature in Ni-Co-Mn-Ti non-textured polycrystalline alloys

2021 ◽  
Vol 119 (5) ◽  
pp. 051904
Author(s):  
Ziqi Guan ◽  
Xinjun Jiang ◽  
Jianglong Gu ◽  
Jing Bai ◽  
Xinzeng Liang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Magnetocaloric Effect ◽  
Room Temperature ◽  
Polycrystalline Alloys

Martensitic Transformation and Mechanical Properties of Fe-Doped Ni54Mn21Ga25 Alloys

2011 ◽  
Vol 687 ◽  
pp. 500-504
Author(s):  
S. X. Xue ◽  
S.S. Feng ◽  
P. Y. Cai ◽  
Q T Li ◽  
H. B. Wang
Keyword(s):  
Magnetic Field ◽  
Mechanical Properties ◽  
Magnetic Properties ◽  
Martensitic Transformation ◽  
Curie Temperature ◽  
Directional Solidification ◽  
Transformation Temperature ◽  
Room Temperature ◽  
Martensitic Transformation Temperature ◽  
Polycrystalline Alloys

Ni54Mn21-xFexGa25（x=0,1,3,5,7,9）polycrystalline alloys were prepared by the technique of directional solidification and the effect of substituting Fe for Mn on the martensitic transformation and mechanical properties of the alloys was analyzed. It was found that the Curie temperature increased with increasing substitution while the martensitic transformation temperature decreased. The Fe-doped Ni54Mn21Ga25 alloys exhibit excellent magnetic properties at room temperature; the typical Ni54Mn20Fe1Ga25 alloy shows a large magnetic-induced-strain of -1040 ppm at a magnetic field of 4000 Oe.

scholarly journals Electromigration studies in amorphous and polycrystalline alloys

1988 ◽  
Vol 53 (2) ◽  
pp. 102-103 ◽  
Author(s):  
M. F. Chisholm ◽  
D. B. Aaron ◽  
J. D. Wiley ◽  
J. H. Perepezko
Keyword(s):  
Polycrystalline Alloys

scholarly journals Yielding behavior in Al-Mg polycrystalline alloys.

1991 ◽  
Vol 41 (12) ◽  
pp. 815-821 ◽  
Author(s):  
Masahiro YANAGAWA ◽  
Shojiro OIE
Keyword(s):  
Polycrystalline Alloys ◽  
Yielding Behavior

Influence of Cr on microstructure and elastocaloric effect in Ni–Mn–In–Co–Cr polycrystalline alloys

2018 ◽  
Vol 382 (39) ◽  
pp. 2876-2879 ◽  
Author(s):  
Ao Shen ◽  
Wen Sun ◽  
Dewei Zhao ◽  
Jian Liu
Keyword(s):  
Elastocaloric Effect ◽  
Polycrystalline Alloys

Evolution of the microstructure and its parameters in copper-aluminum polycrystalline alloys during active plastic deformation with different stacking-fault energy

2021 ◽  
pp. 43-47
Author(s):  
N.A. Koneva ◽  
◽  
L.I. Trishkina ◽  
T.V. Cherkasova ◽  
A.N. Solov’ev ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Stacking Fault ◽  
Stacking Fault Energy ◽  
Deformation Degree ◽  
Transmission Electron Microscopy Analysis ◽  
Al Content ◽  
Polycrystalline Alloys ◽  
Transmission Electron ◽  
Electron Microscopy Analysis ◽  
Copper Aluminum

Evolution of the dislocation structure during active plastic deformation was carried out in copper-aluminum alloys with Al content of 0.5-14 at. % using transmission electron microscopy. Analysis of the types of the dislocation substructure as a function of the alloying element content and deformation degree was conducted. The following parameters of the defect substructure were measured: average scalar dislocation density, curvature-torsion of the crystal lattice and microtwin density. The effect of stacking fault energy on accumulation of defects in the alloys was observed and evaluated.

Sign in / Sign up

Export Citation Format

Share Document