Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 69 for “"Alloying elements"”.
-
Modeling of Effect of Alloying Elements on Radiation Damage in Metallic Alloys
… dynamics simulations were conducted to study the alloying element effects on the primary damage in Fe-based alloys, including defect production and dislocation loop transformations, and their connections with defect thermodynamics. First, effects of alloying elements on the primary damage in three …
-
Effects of alloying elements upon austenite decomposition in high strength low alloy steels
… was explained by synergistic interactions among alloying elements. The paraequilibrium model was applied to calculate the metastable fraction of ferrite in each alloy. This fraction was shown to coincide with cessation of transformation in the Mo alloy transformed at 600°C. Transformation stasis …
-
The role of alloying elements on the microstructure and thermal stability of Refractory Metal High Entropy Superalloys
… understanding of the contributions of different elements to RSA microstructures, through the systematic study of constituent systems, which will aid the design of future RSAs. The nanoscale microstructures in RSAs are believed to form due to the miscibility gaps between the refractory metals and …
-
Scale formation, properties and de-scaling in steelmaking
… layer region. The studies showed that major alloying elements (Mn, Si,), micro alloying (Al) elements, and impurities (Cu, Ni, Cr) modified the properties of the formed scale and its kinetics mechanism. Complexity of scale formation due to alloying elements and impurities in steel and cast …
-
The influence of substitutional elements on the transformability of 3CR12 steel
… its properties. By the addition of appropriate alloying elements, it was hoped to produce a fully austenitic structure in the rolling temperature range, and at the same time to enhance the kinetics of the decomposition of austenite so that a fully ferritic structure could be obtained after air …
-
Solidification, microstructure and mechanical properties of mg-nd-gd-zn-zr cast magnesium alloy with yttrium, erbium and samarium additions
The thesis project an investigation the effect of alloying elements Yttrium, Erbium and Samarium addition on the solidification characteristics, microstructure and mechanical properties of as-cast Mg-Nd-Gd-Zn-Zr magnesium alloy. The future automotive and aerospace industries will experience …
-
Zinc alloy powders for alkaline batteries
… hazard, bismuth and indium are now used as alloying elements to suppress hydrogen evolution. Although alloying elements have been successfully incorporated in zinc powders, the problem with hydrogen evolution in alkaline batteries still persists. A comprehensive study to characterize zinc …
-
Design of Lightweight Magnesium Alloys: Processing, Microstructure and Properties
… these weaknesses has largely focused on costly alloying elements. Elements such as thorium and yttrium have provided excellent improvements to magnesium, but are prohibitively expensive and not commercially viable. The objective of this work was to investigate the e ects of commercially feasible …
-
The microstructure and some phase transformation characteristics of the dual phase steel 3CR12
… demonstrated the influence of the addition of alloying elements (in particular nickel), and thermal history. The dual phase (ferrite plus martensite) nature of the steel has been identified and characterised by both optical and transmission electron microscopy. The islands of lath martensite …
-
Phase transitions in thin iron-palladium films
… of producing a very random distribution of alloying elements within a host element. This study demonstrates the ability of the SQUID (Superconducting Quantum Undulating Interference Device) to measure the Curie temperature of thin films of Pd(1-x)Fe(x). The Curie temperatures of these films …
-
Study on Low-cost Alternatives for Synthesising Powder Metallurgy Titanium and Titanium Alloys
… processing of powders; using low cost alloying elements such as Fe and stainless steel powders and investigating the possibility of using low amounts of alloying elements. The first main stream investigation in this work focussed on a study of induction sintering of Ti and pre-alloyed …
-
Machinability enhancement of non-leaded free cutting steels
… present work it was investigated if alternative alloying elements are capable of substituting for lead in terms of machinability. The machinability of different alloyed free cutting, carbon and case carburising steels was analysed. Thereby, it was focussed on dry machining of free cutting steels …
-
Computer simulation of carburization corrosion of nickel-base superalloys
… cross diffusion effect due to substitutional alloying elements that are preferentially oxidized. The model can treat two sets of boundary conditions corresponding to the presence or absence of a protective oxide scale. It accounts for internal precipitation of corrosion products whenever …
-
STUDY OF STRUCTURAL, THERMAL, HYDROGENATION AND COMPOSITIONAL PROPERTIES OF NI-BASED AMORPHOUS MEMBRANES USING EXPERIMENTAL AND COMPUTATIONAL METHODS
… in hydrogen permeation. However, the effect of alloying element addition on cluster formation, permeation mechanisms, and thermal properties of certain membranes are also not fully understood.A combined experimental and computational approach is used to understand the undiscovered properties of …
-
Quenching and tempering effects on Rheo-cast F357 aluminium alloy during Nd: YAG laser welding
… poses many problems like porosity, loss of alloying elements, poor bead geometry and softening of the heat affected zone. Laser welding is however widely used in industrial production owing to the advantages such as low heat input, high welding speed and high production rate. Due to these …
-
Characterization and Mechanical Properties of Nanoscale Precipitates in Modified Al-Si-Cu Alloys Using Transmission Electron Microscopy and 3D Atom Probe Tomography.
… hardening is the most significant because excess alloying elements from supersaturated solid solution form fine particles which act as obstacles to dislocation movement. The challenges of the 319 type alloys arise due to small size of precipitate and complex aging response caused by multi …
-
Reaktionsmechanismen von Legierungselementen beim rekristallisierenden Glühen zur Schmelztauchveredelung von Mehrphasenstählen
… protective gas atmosphere oxide combinations of alloying elements form on the steel surface and may restrict its hot-dip coating in terms of wetting and adhesion. Furthermore, characteristics of surface enrichments for alloying additions such as manganese, aluminium, silicon or chromium will be …
Page 1 of 4