Mechanical Behavior of Contact Aluminum Alloy

2001 ◽  
Vol 695 ◽  
Author(s):  
David T. Read ◽  
Yi-Wen Cheng ◽  
J. David McColskey ◽  
Robert R. Keller
Keyword(s):  
Room Temperature ◽  
Tensile Tests ◽  
Polycrystalline Aluminum ◽  
Aluminum Films ◽  
High Temperature Heat Treatment ◽  
Transmission Electron ◽  
Silicon Transistors ◽  
Temperature Heat ◽  
Temperature Heat Treatment ◽  
Contact Metal

ABSTRACTWe report the results of tensile tests of thin films of Al-0.5 % Cu deposited on bare silicon. This material was subjected to the complete CMOS fabrication process, including a high-temperature heat treatment. Contact metal makes the electrical connection between the metal wiring and the silicon transistors in a chip. Room-temperature values of yield strength, ultimate tensile strength, and elongation were all lower than the corresponding values found previously for pure electron-beam-evaporated aluminum films. The strengths and elongation decreased slightly as the specimen temperature was raised from 25 to 150°C. The slopes of the stress-strain curves from unloading-reloading runs were lower than the accepted Young's modulus of bulk polycrystalline aluminum. The results are interpreted with the help of scanning and transmission electron microscopy.

The Structure and Properties of Boundaries in Bicrystals of Boron-Doped Ni3(Al,l at% Ta)

1990 ◽  
Vol 213 ◽  
Author(s):  
M. J. Mills ◽  
S. H. Goods ◽  
S. M. Foiles
Keyword(s):  
Room Temperature ◽  
Tensile Ductility ◽  
Al Alloy ◽  
Boron Doped ◽  
Transmission Electron ◽  
Temperature Heat ◽  
Atomistic Calculations ◽  
Rate Of Cooling ◽  
Temperature Heat Treatment ◽  
Ductile State

ABSTRACTThe effect of boron on the structure and macroscopic properties of an isolated grain boundary in bicrystals of a non-stoichiometric Ni3Al alloy (76 at% Ni, 23 at% Al, 1 at%Ta) has been studied. The room temperature tensile ductility and fracture mode of the bicrystals varies dramatically with the rate of cooling after elevated temperature heat treatment. In the absence of significant segregation of boron to the boundary, the bicrystals fail via brittle interfacial fracture with little or no ductility. When the segregation of boron to the boundary is maximized, the bicrystals are highly ductile. High resolution transmission electron microscopy reveals that this ductile state is achieved without the formation of a detectable region of compositional disorder at the boundary. Atomistic calculations using a Monte Carlo scheme predict that only partial disordering of the planes immediately adjacent to the boundary should occur for Ni-rich alloys both with and without boron. These results suggest that the presence of boron causes an increase in the cohesive energy of the boundaries rather than a change in the local compositional ordering.

Effect of high temperature heat treatment on the microstructure and mechanical properties of third generation SiC fibers

2013 ◽  
Vol 1514 ◽  
pp. 131-137
Author(s):  
Dominique Gosset ◽  
Aurélien Jankowiak ◽  
Thierry Vandenberghe ◽  
Maud Maxel ◽  
Christian Colin ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Anisotropy Parameter ◽  
Tensile Tests ◽  
Heat Treatments ◽  
Neutral Atmosphere ◽  
X Ray Diffraction ◽  
Sic Fibers ◽  
High Temperature Heat Treatment ◽  
Temperature Heat ◽  
Temperature Heat Treatment

ABSTRACTSiC fibers (High Nicalon S -HNS and Tyranno SA3 -Ty-SA3) submitted to heat treatments in neutral atmosphere up to 1900°C were studied by X-ray diffraction (XRD) and TEM observations then submitted to tensile tests up to 1800°C. The microstructural changes in both materials were determined by XRD using a modified Hall-Williamson method introducing an anisotropy parameter taking into account the high density of planar defects of the SiC-3C structure. HNS fibers exhibit significant modifications in the CDD size which drastically increases from 24 nm to 70 nm in the range 1600°C to 1800°C and in the microstrains which decrease from 0.0015 to 0.0005 between 1750°C to 1850°C. Concerning the Ty-SA3 fibers, no evolution of CDD size and microstrains has been observed. The mechanical properties of single fibers were investigated after the heat treatments showing decreases in the tensile strength reaching up to 20% for Tyranno SA3 and 50% for High Nicalon S. The Weibull moduli were also significantly affected. These results are correlated to the fiber structural and microstructural evolutions.

Comparison of different models for the high-temperature heat-treatment of wood

2007 ◽  
Vol 46 (7) ◽  
pp. 707-716 ◽  
Author(s):  
Duygu Kocaefe ◽  
Ramdane Younsi ◽  
Sandor Poncsak ◽  
Yasar Kocaefe
Keyword(s):  
Heat Treatment ◽  
High Temperature ◽  
High Temperature Heat Treatment ◽  
Temperature Heat ◽  
Temperature Heat Treatment

Immunomodulating sauces

2021 ◽  
Vol 9 (16) ◽  
pp. 98-108
Author(s):  
Yuliia Kozonova ◽  
◽  
Liubov Teleghenko ◽  
Vita Atanasova ◽  
Keyword(s):  
Raw Materials ◽  
Food Additives ◽  
Titratable Acidity ◽  
Mineral Elements ◽  
Omega 3 ◽  
Daily Consumption ◽  
High Temperature Heat Treatment ◽  
Temperature Heat ◽  
The Subject ◽  
Temperature Heat Treatment

Deficiency of most micronutrients, imbalance in nutrition, together with a dangerous environmental situation in Ukraine, has led to a decrease in the immunity of the population and the spread of alimentary-dependent diseases. Due to the damaged immunological picture of the population in recent years, the relevance of the creation of immunomodulating products is significantly increasing. About 70% of dishes served in restaurant are released with sauces, which allows not only to improve the aroma, appearance and taste of the finished dish, but also to increase the content of the essential substances of the dish. In the assortment of sauce products on the Ukrainian market, most of the sauces contain preservatives, artificial stabilizers and emulsifiers that negatively affect the human body and are not recommended for daily consumption. The subject of research is sauce products for preventive nutrition with increased nutritional value, without the presence of artificial food additives in the composition. The purpose of the study is to develop formulations of immunomodulating sauces using natural raw materials. Methods. The object of the study - developed immunomodulating sauces. In the finished product, the following parameters were determined: titratable acidity (DSTU 4957:2008), microbiological indicators (GOST 10444.15-94, GOST 54728-92, GOST 10444.2-94, GOST 30519-97). The results of the study. As a result of a literature search, the substances were determined, their bigger content in dies being important for improvement in the state of the immune system. These substances include, first of all, antioxidant vitamins (C, A and E), polyunsaturated fatty acids (especially omega-3), mineral elements and other minor substances. During developing the formulations of immunomodulating sauces, twelve requirements were formulated.. As a result of the raw materials selection, three formulations of immunomodulating sauces have been proposed. In their technology, there is a high-temperature heat treatment, which allows maximizing the preservation of useful thermolabile components. Scope of research results. Ready-made sauces are sold in restaurant establishments and consumed locally. Due to their simplicity of preparation, they can also be recommended for making at home. The developed immunomodulating sauces have a pleasant appearance and harmonious taste, which is confirming the data of sugar-acid indices.

scholarly journals Investigating Corrosion Resistance of Heavy-Duty Steel Fasteners Regarding Assemblies Operating in Maritime Climates under High Pressures Power, Metallurgical and Chemical Engineering

2020 ◽  
pp. 94-106
Author(s):  
K.I. Nedashkovskiy ◽  
A.V. Gulshin ◽  
Yu.M. Averina ◽  
V.A. Naumkina ◽  
V.V. Menshikov ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Grain Refinement ◽  
Chemical Engineering ◽  
High Pressures ◽  
Heavy Duty ◽  
High Temperature Heat Treatment ◽  
Temperature Heat ◽  
Temperature Heat Treatment

The paper presents investigation results and a technology for manufacturing fastener workpieces out of the 07Kh16N6-Sh (07Х16Н6-Ш) steel using high-temperature heat treatment. The steel undergoing our testing was additionally doped with molybdenum, as reflected in the 07Kh16N6M-Sh (07Х16Н6М-Ш) designation, which facilitated grain refinement. We implemented accelerated climate testing of bolts in order to assess the corrosion cracking resistance of 07Kh16N6-Sh (07Х16Н6-Ш), 07Kh16N6M-Sh (07Х16Н6М-Ш) and 13Kh15N4AM3-Sh (13Х15Н4АМ3-Ш) steel fasteners in maritime climates.

Vapor Phase Growth of Carbon Microcoils / Nanocoils

2005 ◽  
Vol 23 ◽  
pp. 387-0
Author(s):  
S. Yang ◽  
X. Chen ◽  
S. Motojima
Keyword(s):  
Heat Treatment ◽  
Catalytic Pyrolysis ◽  
Double Helix ◽  
Phase Growth ◽  
High Temperature Heat Treatment ◽  
Coil Diameter ◽  
Temperature Heat ◽  
Α Helix ◽  
Temperature Heat Treatment ◽  
Single Helix

The carbon microcoils and carbon nanocoils were prepared by the catalytic pyrolysis of acetylene under the Ni and/or Fe-containing catalysts, and the growth pattern, morphology and growth mechanism of the carbon coils were examined in detail. The inner coil diameter of carbon microcoils are of several µm and coil gap from zero to several µm. The inner coil diameter of carbon nanocoils are from zero to several ten nm and coil gap from zero to several nm. The carbon microcoils are generally of double helix coils such as DNA while carbon nanocoils were single helix coils such as α-helix proteins, with spring-like or twisted forms. A catalyst grain was usually observed on the tip of carbon coil. The carbon nanocoils are almost amorphous and can be graphitized by the high temperature heat-treatment.

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