Structural, mechanical and corrosion evaluations of Cu/Zn/Al multilayered composites subjected to CARB process

2021 ◽  
Vol 867 ◽  
pp. 158973
Author(s):  
Mahsa Avazzadeh ◽  
Morteza Alizadeh ◽  
Moslem Tayyebi
Keyword(s):  
Multilayered Composites

The Formation of Cu3Si from Cu/a-Si Multilayers

1997 ◽  
Vol 481 ◽  
Author(s):  
R. R. Chromik ◽  
W. K. Neils ◽  
E. J. Cotts
Keyword(s):  
Diffusion Couples ◽  
X Ray Diffraction ◽  
Limited Growth ◽  
Scanning Calorimetry ◽  
Individual Layer ◽  
Diffusion Limited ◽  
Reaction Constant ◽  
Multilayered Composites ◽  
Reaction Constants ◽  
Kinetics Of

ABSTRACTThe kinetics of the formation of Cu3Si in Cu/a-Si diffusion couples have been investigated by means of differential scanning calorimetry and x-ray diffraction. Multilayered composites of average stoichiometry Cu3Si were prepared by sputter deposition with individual layer thicknesses varying in different samples between 2 and 100 nm. We observed diffusion limited growth of Cu3 Si upon annealing these diffusion couples below 500 K. Reaction constants were measured for a temperature range of 455 to 495 K for thicknesses of growing Cu3Si between 2.6 and 80 nm. The temperature dependence of the reaction constant, k2, was characterized as k2 = k0 exp(− Ea/kbT) with activation energy, Ea = 1.0 eV/atom and pre-factor, k0 = 1.9×10−3 cm2/s.

SiC-based multilayered composites containing short carbon fibres obtained by tape casting

2009 ◽  
Vol 69 (11-12) ◽  
pp. 1772-1776 ◽  
Author(s):  
L. Fuso ◽  
D. Manfredi ◽  
S. Biamino ◽  
M. Pavese ◽  
P. Fino ◽  
...  
Keyword(s):  
Tape Casting ◽  
Carbon Fibres ◽  
Multilayered Composites ◽  
Short Carbon

Instrumented indentation on alumina–alumina/zirconia multilayered composites with residual stresses

2006 ◽  
Vol 86 (33-35) ◽  
pp. 5371-5382 ◽  
Author(s):  
E. Jiménez-Piqué ◽  
L. Ceseracciu ◽  
Y. Gaillard ◽  
M. Barch ◽  
G. De Portu ◽  
...  
Keyword(s):  
Residual Stresses ◽  
Instrumented Indentation ◽  
Multilayered Composites

A heat mixed variational theorem for thermoelastic multilayered composites

2006 ◽  
Vol 84 (19-20) ◽  
pp. 1247-1255 ◽  
Author(s):  
Ayech Benjeddou ◽  
Orlando Andrianarison
Keyword(s):  
Variational Theorem ◽  
Multilayered Composites

Dislocation dynamics analysis of dislocation intersections in nanoscale metallic multilayered composites

2007 ◽  
Vol 101 (8) ◽  
pp. 084314 ◽  
Author(s):  
F. Akasheh ◽  
H. M. Zbib ◽  
J. P. Hirth ◽  
R. G. Hoagland ◽  
A. Misra
Keyword(s):  
Dislocation Dynamics ◽  
Dynamics Analysis ◽  
Multilayered Composites

scholarly journals The structure and mechanical properties of multilayer nanocrystalline TiN/ZrN coatings obtained by vacuum-arc deposition

2007 ◽  
Vol 1 (1-2) ◽  
pp. 43-47 ◽  
Author(s):  
O.A. Tokarev ◽  
A.V. Demchyshyn ◽  
G.A. Avtonomov
Keyword(s):  
Mechanical Properties ◽  
Processing Parameters ◽  
Hard Coatings ◽  
Vacuum Arc ◽  
Deposition Technique ◽  
Nitrogen Gas ◽  
Working Pressure ◽  
Multilayered Composites ◽  
Sublayer Thickness ◽  
Gas Medium

TiN/ZrN multilayered condensates on BK-8 carbide tips substrates (62 HRC) were produced by the vacuumarc deposition technique, using Ti and Zr plasma flows in reactive nitrogen gas medium with working pressure of 6.6?10-1 Pa. The TiN/ZrN multilayered condensates consist of TiN and ZrN sublayers, which have a thickness of ~100 nm, controlled by the processing parameters of the used deposition technique. The obtained coatings have hardness of 45 GPa and Young?s modulus of 320 GPa. The obtained results show that mechanical properties of such multilayered composites are considerably improved in comparison to those for the single-component coatings, TiN and ZrN. The dependence of hardness and Young?s modulus of the composites on sublayer thickness within a range of 100 nm was determined. The investigated structure and improved mechanical properties of the TiN/ZrN multilayered condensates would be very good platform for finding their industrial application, such as hard coatings with different purposes.

Solid state amorphization reactions in deformed Ni-Zr multilayered composites

1990 ◽  
Vol 5 (3) ◽  
pp. 488-497 ◽  
Author(s):  
G. C. Wong ◽  
W. L. Johnson ◽  
E. J. Cotts
Keyword(s):  
Thermal Stability ◽  
Solid State ◽  
Amorphous Phase ◽  
Equilibrium Phase ◽  
Solid State Reactions ◽  
Heat Of Mixing ◽  
Scanning Calorimetry ◽  
Multilayered Composites ◽  
State Amorphization ◽  
Thermal Stability Of

The mechanisms of metallic glass formation and competing crystallization processes in mechanically-deformed Ni-Zr multilayered composites have been investigated by means of differential scanning calorimetry and x-ray diffraction. Our investigation of the heat of formation of amorphous NixZr1−x alloys shows a large negative heat of mixing (on the order of 30 kJ/mole) for compositions near Zr55Ni45 with a compositional dependence qualitatively similar to that predicted by mean field theory. We find that the products of solid state reactions in composites of Ni and Zr can be better understood in terms of the equilibrium phase diagram and the thermal stability of liquid quenched metallic glasses. We have determined the composition of the growing amorphous phase at the Zr interface in these Ni-Zr diffusion couples to be 55 ± 4% Zr. We investigated the kinetics of solid state reactions competing with the solid state amorphization reaction and found the value of the activation energy of the initial crystallization and growth of the growing amorphous phase to be 2.0 ± 0.1 eV, establishing an upper limit on the thermal stability of the growing amorphous phase.

scholarly journals A Simple Method for Theoretical Prediction of Fracture Toughness of Multilayered Composites

2003 ◽  
Vol 12 (4) ◽  
pp. 096369350301200 ◽  
Author(s):  
R. Ramesh Kumar ◽  
P.N. Dileep ◽  
S. Renjith ◽  
G. Venkateswara Rao
Keyword(s):  
Fracture Toughness ◽  
Crack Initiation ◽  
Theoretical Prediction ◽  
Test Data ◽  
Fibre Orientation ◽  
Compact Tension ◽  
Compact Tension Specimen ◽  
Initial Crack ◽  
Simple Method ◽  
Multilayered Composites

Intralaminar fracture toughness of a fibre-reinforced angle ply and cross ply laminates are generally obtained by testing compact tension specimen and theoretically predicted using the well-known MCCI approach. The crack initiation direction, which is treated as a branch direction for the theoretical prediction, is an apriori. A conservative estimation on the toughness value obtained by considering branch crack angle corresponding to each fibre orientation in a laminate shows a gross error with respect to test data. In the present study a new criterion for the prediction of crack initiation angle is arrived at based on Tsai-Hill minimum strain energy density criterion. This shows a very good agreement with test data available in literature on fracture toughness of various multilayered composites with large size cracks with a/w ≥ 0.3. It is interesting to note that in a multilayered composite a simple method of prediction in which crack initiation direction is assumed to be the fibre orientation that is close to the initial crack direction gives a good estimation of the intralaminar fracture toughness.

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