scholarly journals Influence of Plastic Deformation During Extrusion Process on Heat Resistance Alloys Fe40Al

2017 ◽  
Vol 62 (4) ◽  
pp. 2281-2286 ◽  
Author(s):  
D. Pasek ◽  
J. Cebulski
Keyword(s):  
Plastic Deformation ◽  
Heat Resistance ◽  
Structural Changes ◽  
Extrusion Process ◽  
Test Results ◽  
Research Setting ◽  
Alloy Matrix ◽  
X Ray ◽  
Kinetics Of ◽  
Corrosion Research

AbstractThe article presents the results of studies on the effects wrought on the corrosion resistance of the alloy matrix phase inter-metallic FeAl. Researches were carried out on the Fe40Al5Cr0.2TiB alloy and involved the oxidation of the samples after the crystallization after plastic deformation made by extrusion. The tests were performed in an oven in air at 1100°C for 100, 300 and 500 h. Determined to change the mass of the samples after corrosion research setting kinetics of corrosion processes, as well as an analysis of the microstructure of the alloy after the crystallization and after forming. The structure was examined using light microscopy and scanning electron microscopy and X-ray microanalysis with EDS chemical composition of the corrosion products. The test results revealed that plastic deformation during extrusion of intermetallic alloy led to structural changes, the effect of which was to improve the heat resistance at a temperature of 1100°C.

Phase Transformation in Austenitic Steel Induced by Plastic Deformation

2010 ◽  
Vol 163 ◽  
pp. 295-298 ◽  
Author(s):  
Jan Drahokoupil ◽  
Petr Haušild ◽  
Vadim Davydov ◽  
P. Pilvin
Keyword(s):  
Plastic Deformation ◽  
Phase Transformation ◽  
Martensitic Transformation ◽  
Neutron Diffraction ◽  
Volume Fraction ◽  
X Ray Diffraction ◽  
X Ray ◽  
Deformed State ◽  
Kinetics Of ◽  
Electron Back Scattered Diffraction

Kinetics of deformation induced martensitic transformation in metastable austenitic AISI 301 steel was characterized by several techniques including classical light metallography, X-ray diffraction, neutron diffraction and electron back scattered diffraction. In order to characterize the martensitic transformation, several specimens were tensile pre-deformed to 5%, 10% and 20% of plastic deformation and compared with non-deformed state. During straining, the volume fraction of α’-martensite rapidly prevails over the volume fraction of original austenite and reach the value circa 70%.

Diffusion and Structural Changes in High-Speed Steels Alloyed with Boron

2009 ◽  
Vol 283-286 ◽  
pp. 279-284 ◽  
Author(s):  
Alexander S. Chaus
Keyword(s):  
High Speed ◽  
Structural Changes ◽  
Diffusion Processes ◽  
Final Heat Treatment ◽  
X Ray Diffraction ◽  
X Ray ◽  
Eutectic Carbides ◽  
Structure And Phase Transformations ◽  
Kinetics Of ◽  
Quenching And Tempering

The structure and phase composition of high-speed steels of different grades additionally alloyed with boron after casting, annealing, and subsequent final heat treatment (quenching and tempering) have been studied focusing on diffusion processes. In order to investigate kinetics of both the structure and phase transformations in eutectic carbides upon heat treatments, different techniques of optical microscopy, electron microscopy (both scanning and transmission ones), X-ray diffraction, and energy dispersive X-ray analysis have been used.

scholarly journals Determining Deformation Transition in Polyethylene under Tensile Loading

Polymers ◽  
2019 ◽  
Vol 11 (9) ◽  
pp. 1415
Author(s):  
Na Tan ◽  
P.-Y. Ben Jar
Keyword(s):  
Plastic Deformation ◽  
Tensile Test ◽  
Crystalline Phase ◽  
Test Results ◽  
Short Term ◽  
X Ray ◽  
X Ray Scattering ◽  
Load Carrying ◽  
Material State

The multi-relaxation (MR) test was developed based on the concept that stress relaxation behavior can be used to reflect the material state of polyethylene (PE) under tension. On the basis of this concept, critical stroke for the onset of plastic deformation in the crystalline phase, named the first critical stroke, was determined using the MR test. Results from wide angle X-ray scattering suggest that phase transformation occurred in the crystalline phase of PE after the specimen was stretched beyond the first critical stroke. In this work, the MR test was applied to six PEs of different mass densities to determine their first critical strokes and the corresponding total and quasi-static (QS) stress values. The results show that the first critical stroke had very similar values among the six PEs. More interestingly, the ratio of the QS stress at the first critical stroke to the yield stress from the standard tensile test showed little dependence on PE density. Therefore, it was possible to use the popular short-term tensile test to characterize the critical QS component of the applied stress to initiate plastic deformation in the crystalline phase, which is expected to play a significant role on the long-term, load-carrying applications of PE.

Measurement of Kinetics and Mechanisms of Phase Transitions in Lipid–Water Systems

1997 ◽  
Vol 30 (5) ◽  
pp. 733-738 ◽  
Author(s):  
P. J. Quinn
Keyword(s):  
Phase Transitions ◽  
Powder Diffraction ◽  
Structural Changes ◽  
Aqueous Media ◽  
Water System ◽  
Water Systems ◽  
Dynamic Membrane ◽  
X Ray ◽  
Media Form ◽  
Kinetics Of

The lipids from biological membranes, when dispersed in aqueous media, form a variety of phases that include bilayer and nonbilayer arrangements of the molecules. Such phases have been well characterized by conventional X-ray powder diffraction and other methods. Transitions between phases are believed to underlie a number of dynamic membrane processes such as membrane fusion. Studies of the kinetics and mechanisms of phase transitions in lipid–water mixtures require high-intensity synchrotron X-ray sources to monitor the associated structural changes. Facilities at four synchrotron sources providing facilities to measure kinetics and mechanisms of phase transitions in lipid–water systems are described. Some examples are given of how these facilities have been used to measure kinetics of transitions in the dipalmitoylphosphatidylcholine–water system and how different transition mechanisms are defined.

The Influence of Severe Plastic Deformation on Structure and Mechanical Properties the Aluminium Alloy EN AW 6082

2014 ◽  
Vol 635 ◽  
pp. 18-21 ◽  
Author(s):  
Petra Lacková ◽  
Ondrej Milkovič ◽  
Marián Buršák ◽  
Tibor Kvačkaj
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Aluminium Alloy ◽  
Structural Changes ◽  
The Other ◽  
Cold Extrusion ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ecap Process

The effect of severe plastic deformation by ECAP process on the microstructures and mechanical properties of the aluminium alloy EN AW 6082 produced by cold extrusion is investigated. In both states were evaluated the structural changes by light microscopy, the analysis particles in structures, by X-ray diffraction (XRD) in transmission mode by synchrotron radiation and mechanical properties. Severe plastic deformation leads to strengthening of investigated EN AW 6082 alloy but on the other hand the plasticity of ECAP-ed alloy decreases.

Structural Changes during Plastic Deformation at Crack Tips in PVDF Films:  A Scanning X-ray Scattering Study

2005 ◽  
Vol 38 (14) ◽  
pp. 6099-6105 ◽  
Author(s):  
Günther A. Maier ◽  
Gernot Wallner ◽  
Reinhold W. Lang ◽  
Peter Fratzl
Keyword(s):  
Plastic Deformation ◽  
Structural Changes ◽  
X Ray ◽  
X Ray Scattering ◽  
Crack Tips ◽  
Scattering Study ◽  
Ray Scattering

Dispersive X-ray absorption study of the kinetics of photo-induced structural changes in glassy As2S3

1989 ◽  
Vol 158 (1-3) ◽  
pp. 52-53 ◽  
Author(s):  
J.M. Lee ◽  
M.A. Paesler ◽  
D.E. Sayers ◽  
Alain Fontaine
Keyword(s):  
Structural Changes ◽  
Absorption Study ◽  
X Ray ◽  
X Ray Absorption ◽  
Kinetics Of

Chemical partitioning of elements in Ni-base MC-carbide reinforced eutetic superalloys

1983 ◽  
Vol 41 ◽  
pp. 250-251
Author(s):  
E. F. Koch ◽  
E. L. Hall ◽  
S. W. Yang
Keyword(s):  
Alloy Composition ◽  
Volume Fraction ◽  
Lattice Mismatch ◽  
Turbine Blades ◽  
Eutectic Alloys ◽  
Alloy Matrix ◽  
X Ray ◽  
Gas Turbine Blades ◽  
Analytical Electron ◽  
Analytical Electron Microscope

The plane-front solidified eutectic alloys consisting of aligned tantalum monocarbide fibers in a nickel alloy matrix are currently under consideration for future aircraft and gas turbine blades. The MC fibers provide exceptional strength at high temperatures. In these alloys, the Ni matrix is strengthened by the precipitation of the coherent γ' phase (ordered L12 structure, nominally Ni3Al). The mechanical strength of these materials can be sensitively affected by overall alloy composition, and these strength variations can be due to several factors, including changes in solid solution strength of the γ matrix, changes in they γ' size or morphology, changes in the γ-γ' lattice mismatch or interfacial energy, or changes in the MC morphology, volume fraction, thermal stability, and stoichiometry. In order to differentiate between these various mechanisms, it is necessary to determine the partitioning of elemental additions between the γ,γ', and MC phases. This paper describes the results of such a study using energy dispersive X-ray spectroscopy in the analytical electron microscope.

A morphological and energy-dispersive x-ray spectroscopy (EDS) investigation of separator-grade cellophane

1994 ◽  
Vol 52 ◽  
pp. 430-431
Author(s):  
Michael E. Rock ◽  
Vern Kennedy ◽  
Bhaskar Deodhar ◽  
Thomas G. Stoebe
Keyword(s):  
Extrusion Process ◽  
Morphological Characterization ◽  
Energy Dispersive ◽  
Regenerated Cellulose ◽  
Battery System ◽  
X Ray ◽  
Functional Differences ◽  
Transmission Electron ◽  
Separator Material ◽  
Underwater Target

Cellophane is a composite polymer material, made up of regenerated cellulose (usually derived from wood pulp) which has been chemically transformed into "viscose", then formed into a (1 mil thickness) transparent sheet through an extrusion process. Although primarily produced for the food industry, cellophane's use as a separator material in the silver-zinc secondary battery system has proved to be another important market. We examined 14 samples from five producers of cellophane, which are being evaluated as the separator material for a silver/zinc alkaline battery system in an autonomous underwater target vehicle. Our intent was to identify structural and/or chemical differences between samples which could be related to the functional differences seen in the lifetimes of these various battery separators. The unused cellophane samples were examined by transmission electron microscopy (TEM) and energy dispersive X-ray spectroscopy (EDS). Cellophane samples were cross sectioned (125-150 nm) using a diamond knife on a RMC MT-6000 ultramicrotome. Sections were examined in a Philips 430-T TEM at 200 kV. Analysis included morphological characterization, and EDS (for chemical composition). EDS was performed using an EDAX windowless detector.

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