Thin foil electron microscope observations on NiTiCu shape memory alloys

1980 ◽  
Vol 11 (9) ◽  
pp. 1541-1546 ◽  
Author(s):  
R. H. Bricknell ◽  
K. N. Melton
Keyword(s):  
Electron Microscope ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Thin Foil ◽  
Thin Foil Electron

A Novel Fabrication Method for Nitinol Shape Memory Alloys

2010 ◽  
Vol 442 ◽  
pp. 309-315 ◽  
Author(s):  
S.A. Rizvi ◽  
T.I. Khan
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Compositional Analysis ◽  
Thin Foil ◽  
Optical Microscope ◽  
Scanning Calorimetry ◽  
Experimental Conditions ◽  
Cross Sectional ◽  
Joint Replacements ◽  
Laser Facility

Nitinol (NiTi) shape memory alloys are widely used in a variety of biomedical applications, such as dental implants, cervical and lumbar vertebral replacements, joint replacements and stents. In this study, commercially pure Ti and Ni foils ~100 um thick were diffusion bonded in vacuum. The experimental conditions were optimized to achieve a near equiatomic composition to produce NiTi SMA thin foil of approx. 5-8 micron thick. The cross-sectional surfaces of joint were subjected to metallographic investigation using optical microscope after grinding, polishing and etching. Scanning electron microscope equipped with EDX system was utilized to characterize the bonded layer and compositional analysis. Differential scanning calorimetry (DSC) technique was employed to determine the shape memory effect. The samples were subjected to X-ray diffraction analysis in order to establish phase structures formed during the diffusion bonding stage. An ultra fast femto-second laser facility was utilized to ensure the production of complex shapes or patterns within micron scale.

Effect of Y Addition on Wear Property of Ni-Mn-Ga Shape Memory Alloys

2014 ◽  
Vol 513-517 ◽  
pp. 125-128
Author(s):  
Ai Lian Liu ◽  
Jia Wen Xu ◽  
Li Gao ◽  
Bing Yu Qian
Keyword(s):  
Electron Microscope ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Dry Sliding ◽  
Wear Property ◽  
Magnetic Shape Memory ◽  
Wear Properties ◽  
Magnetic Shape Memory Alloys ◽  
Sliding Test ◽  
Scanning Electron

The effect of Y addition on the hardness and wear properties of Ni-Mn-Ga magnetic shape memory alloys is researched by means of dry sliding test and Scanning Electron Microscope (SEM) in the paper. The results show that Y addition makes Ni-Mn-Ga alloys become harder, and the hardness of Ni-Mn-Ga shape memory alloys increases with Y content increasing. Adding Y improves the dry-gliding wear property of Ni-Mn-Ga alloy. Main abrasive wear mechanism is observed in Ni-MnGa-Y alloy.

Growth of hematite by surface oxidation of olivine

1988 ◽  
Vol 46 ◽  
pp. 800-801
Author(s):  
S. McKernan ◽  
C. B. Carter
Keyword(s):  
Electron Microscope ◽  
Surface Oxidation ◽  
Thin Foil ◽  
Nucleation And Growth ◽  
Ion Milling ◽  
Annealed Material ◽  
Thin Foils ◽  
Natural Olivine ◽  
Approximate Composition ◽  
Second Phases

The oxidation of natural olivine has previously been performed on bulk samples and the reactions followed by preparation of TEM specimens from the annealed material. These results show that below ∼1000°C hematite and amorphous silica are formed, particularly around dislocations. At higher temperatures magnetite and some enstatite-like phase are formed. In both cases the olivine is left almost totally Fe depleted. By performing the oxidation on characterized thin TEM specimens it is possible to obtain more information on the nucleation and growth of the second phases formed. The conditions in a thin foil, however, are very different from those in the bulk especially with regard to surface effects. The nucleation of precipitates in particular may be expected to occur differently in these thin foils than in the bulk.TEM specimens of natural olivine (approximate composition Mg+Fe+Si2o4) which had been annealed at 1000°C for 1 hr were prepared by mechanical polishing and dimpling, followed by Ar ion milling to perforation. The specimens were characterized in the electron microscope and then heated in air in alumina boats to 900°C for between 30 and 180 minutes.

Atomic Order and Martensitic Transformation in Cu-Al-Be Shape Memory Alloys

1995 ◽  
Vol 05 (C8) ◽  
pp. C8-973-C8-978
Author(s):  
M. Jurado ◽  
Ll. Mañosa ◽  
A. González-Comas ◽  
C. Stassis ◽  
A. Planes
Keyword(s):  
Martensitic Transformation ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Atomic Order

Concentration, temperature and deformation dependences of martensite lattice parameters in binary Ti-Ni shape memory alloys

2003 ◽  
Vol 112 ◽  
pp. 651-654 ◽  
Author(s):  
S. D. Prokoshkin ◽  
V. Brailovski ◽  
S. Turenne ◽  
I. Yu Khmelevskaya ◽  
A. V. Korotitskiy ◽  
...  
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Lattice Parameters
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