scholarly journals Effect of Heat Treatment on Structural and Mechanical Properties of Alloyed Fused Alumina

2022 ◽  
Author(s):  
Y. Bagaiskov
Keyword(s):  
Heat Treatment ◽  
Solid Solution ◽  
Fracture Pattern ◽  
Structural Performance ◽  
Material Strength ◽  
Decomposition Level ◽  
X Ray ◽  
Ceramic Bond ◽  
High Temperature Processes ◽  
Composition Structure

Abstract. Heat treatment of ceramic-bond grinding tools during manufacture takes place at temperature of abrasive grains up to 1250 °C, which results in variation of their phase composition, structure, and strength. Similar phenomena may take place during grinding caused by the occurring high-temperature processes. It primarily pertains to alloyed fused alumina. X-ray and topography testing, as well as studying of micromechanical properties made it clear that structural performance, material strength, and fracture pattern of single grains of Ti-containing fused alumina affected by temperature depend on the type and ratio of alloy additives in alumina and on the decomposition level of the Ti2O3 solid solution. In terms of aggregate properties, purple varieties of Cr-Ti fused alumina featuring the minimum TiO2/Cr2O3 ratio of 1.5 in the solid solution after heat treatment are preferable.

The Precipitation of Si in AlCuSi Thin Films

1973 ◽  
Vol 31 ◽  
pp. 34-35 ◽  
Author(s):  
R. M. Anderson
Keyword(s):  
Electron Microscopy ◽  
Thin Films ◽  
Heat Treatment ◽  
Solid Solution ◽  
Integrated Circuit ◽  
Copper Film ◽  
Solution Concentration ◽  
X Ray ◽  
Silicon Thin Films ◽  
Before And After

Aluminum-copper-silicon thin films have been considered as an interconnection metallurgy for integrated circuit applications. Various schemes have been proposed to incorporate small percent-ages of silicon into films that typically contain two to five percent copper. We undertook a study of the total effect of silicon on the aluminum copper film as revealed by transmission electron microscopy, scanning electron microscopy, x-ray diffraction and ion microprobe techniques as a function of the various deposition methods.X-ray investigations noted a change in solid solution concentration as a function of Si content before and after heat-treatment. The amount of solid solution in the Al increased with heat-treatment for films with ≥2% silicon and decreased for films <2% silicon.

Analysis of CoCrMo Surface Oxide Removal by Alumina Blasting before Porcelain Firing in Dental Restorations

2012 ◽  
Vol 730-732 ◽  
pp. 9-14 ◽  
Author(s):  
Bruno Henriques ◽  
Filipe Silva ◽  
Delfim Soares
Keyword(s):  
Heat Treatment ◽  
Surface Roughness ◽  
Chemical Composition ◽  
High Alumina ◽  
X Ray ◽  
Dental Restorations ◽  
Ceramic Bond ◽  
Xrf Scanning ◽  
Oxide Removal

The purpose of this work was to perform a chemical and mechanical characterization of a preoxidized CoCrMo alumina blasted surface. This is a commonly performed surface treatment used in metal-porcelain systems for dental restorations to remove oxides formed during preoxidation heat treatment from the metal’s surface. CoCrMo dental alloy’s specimens produced by lost wax process were examined in terms of chemical composition using X-Ray fluorescence spectroscopy (XRF), Scanning Electron Microscopy (SEM) and Energy Dispersive X-Ray Spectroscopy (EDS); in terms of mechanical characteristics through the means of a microhardness test and in terms of surface roughness using a profilometer. It was investigated the chemical composition of various surface conditions: non-preoxidized, preoxidized, ground oxidized surface and sandblasted oxidized surface. After alumina blasting, the oxides level on metal’s surface remained high. Alumina blasting treatment (Ø110 µm) produced an 84% increase of CoCrMo surface hardening and an increase in surface roughness (Ra=0.58 µm). It was found alumina contaminants on the metal’s surface. Therefore, it was concluded that alumina blasting do not entirely removes the oxide layer formed during preoxidation heat treatment. It produced a chemical and mechanical surface modification that can influence the metal-ceramic bond strength.

scholarly journals The effect of a rapid photon treatment of the foil of the PdCu solid solution of composition close to the equiatomic

2019 ◽  
Vol 489 (3) ◽  
pp. 258-261
Author(s):  
V. M. Ievlev ◽  
K. A. Solntsev ◽  
О. V. V. Serbin ◽  
А. I. Dontsov ◽  
D. А. Sinetskaya ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Solid Solution ◽  
High Power ◽  
Electrical Resistance ◽  
Treatment Mode ◽  
X Ray ◽  
Heat Treatment Mode ◽  
Xenon Lamps ◽  
Energy Dose

transformations in a thin ~4 m foil of PdCu solid solution were investigated by x-ray diffractometry and measurement of electrical resistance in heating-cooling cycles during thermal or rapid photon treatment by radiation of high-power pulsed xenon lamps. It has been found that a single rapid photon treatment for 0,3 s (the energy dose of the radiation entering the sample is 10 j cm‑2) leads to a complete disordering of the solid solution at a rate 400 times greater than in the heat treatment mode used (heating at a rate of 15 K min‑1).

Hot Dip Aluminizing of 9Cr-1Mo Steels and their Heat Treatment

2015 ◽  
Vol 830-831 ◽  
pp. 143-146
Author(s):  
Jalpa Patel ◽  
Prashanth Huilgol ◽  
Nirav Jamnapura ◽  
K. Udaya Bhat
Keyword(s):  
Electron Microscopy ◽  
Heat Treatment ◽  
Solid Solution ◽  
Reaction Layer ◽  
Treatment Duration ◽  
Substrate Material ◽  
X Ray ◽  
Heat Treated ◽  
Heat Treatment Duration ◽  
Scanning Electron

Coupons of 9Cr-1Mo steels of type SA 387 Grade 9 class 2 were hot dip aluminized using Al bath at a temperature of 700 °C for 30 seconds. The samples were further heat treated at 750 °C for durations of 1, 3 and 5 hours, respectively. The samples were characterized using X-ray diffractometry, scanning electron microscopy and energy dispersive spectroscopy. The investigation showed that as coated samples contain an aluminum top coat, a reaction layer and substrate material. Within the reaction layer, two distinct regions corresponding to Fe2Al5 and Fe4Al13 were identified. Chromium up to 2 at% was observed. After heat treatment Al coat was not existing. Two distinct layers, corresponding to a thick Fe2Al5 and a thin FeAl were observed at shorter heat treatment duration. Under longer heat treatment durations, multiple phases, namely, Fe2Al5, FeAl, Fe3Al and solid solution of Al in Fe were observed.

Influence of Yttrium and Heat Treatment on Microstructure and Mechanical Properties of AM60 Alloy

2011 ◽  
Vol 194-196 ◽  
pp. 1319-1325
Author(s):  
Zheng Tian ◽  
Zhan Yi Cao ◽  
Jian Meng
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Solid Solution ◽  
Yield Strength ◽  
Solution Treatment ◽  
Aging Treatment ◽  
Hardness Measurement ◽  
X Ray ◽  
Solid Solution Treatment ◽  
Yttrium Addition

The effect of yttrium addition and heat treatment on the mechanical properties and microstructure of AM60 magnesium alloy have been investigated using X-ray phase analysis, microstructure investigation, tensile test, hardness measurement and fracture surfaces analysis. The results showed that the mechanical properties of the alloys were obviously improved with the addition of yttrium no more than 1.0%. The reinforcement of the alloys resulted from the appearance of Al2Y phase. After solid-solution treatment (T4), the Mg17Al12 phase almost dissolved in Mg matrix, but the rare earth compounds Al2Y phase was rather stable. The ultimate tensile strength σb was improved, but the yield strength σ0.2 and elongation δ were only slightly changed. After solid-solution + aging treatment (T6), the Mg17Al12 phase precipitated again and their morphology was changed. The yield strength σ0.2 was improved.

scholarly journals Microstructure and Mechanical properties development of ZA27 alloy through heat treatment

2021 ◽  
Vol 9 (12) ◽  
pp. 1484-1490
Keyword(s):  
Heat Treatment ◽  
Solid Solution ◽  
Solution Treatment ◽  
X Ray Diffraction ◽  
X Ray ◽  
Wear Rates ◽  
Za27 Alloy ◽  
Β Phase ◽  
Solid Solution Treatment ◽  
Scanning Electron

In this work, ZA-27 alloy was fabricated and solid solution treatment at 120, 240 and 360 °C for 1 hr., microstructure and physical properties of alloy were studied by X-ray diffraction, scanning electron microscopy. Results observed that the microstructure of ZA-27 alloy manufactured (as-cast) was composed of α, β, η and ε phases, then decomposed to β phase at 360 oC. The heat treatment of ZA-27 alloys influenced on microstructure, decreasing of strength and hardness, but also causes increasing of elongation. The wear rates of changes increase with increasing solid solution treatment

Study of Aluminium-Titanate Based Ceramics in Fe2O3-Al2O3-TiO2 System

2010 ◽  
Vol 659 ◽  
pp. 31-36
Author(s):  
Támas Korim
Keyword(s):  
Heat Treatment ◽  
Solid Solution ◽  
Lattice Parameter ◽  
Self Healing ◽  
X Ray Diffraction ◽  
Repeated Heating ◽  
X Ray ◽  
Aluminium Titanate ◽  
Complete Solid Solution ◽  
Constructed Self

Solid solutions formed within the Al2O3-TiO2-Fe2O3 (Fe2xAl2(1-x)TiO5) system upon heat treatment were investigated by adjusting the substituting Fe3+ content in the range of x=0.0 to 1.0. X-ray diffraction phase analyses and lattice parameter determinations confirmed that substitution of Fe3+ ions within the aluminium titanate lattice was complete. For this complete solid solution, however, the trends observed for changes in d-spacing values indicated that there were certain discrete compositions to identify with Fe3+ substitution. Within these, Fe0.4Al1.6TiO5 and Fe1.6Al0.4TiO5 crystalline phases were investigated in detail and their X-ray diffraction cards were constructed. Self-healing effect occurring in repeated heating-cooling cycles in Fe3+ doped AT ceramics were proved; it was demonstrated that Fe3+ doped AT ceramics do not decompose even if exposed to repeated thermal shock.

Study of Cuprous Oxide formed in Air at 0.5 mm of Hg between 200° C and 1030° C and its rectification

1957 ◽  
Vol 12 (2) ◽  
pp. 96-101 ◽  
Author(s):  
K. R. Dixit ◽  
V. V. Agashe
Keyword(s):  
Heat Treatment ◽  
Diamagnetic Susceptibility ◽  
Subsequent Heat Treatment ◽  
Appreciable Amount ◽  
Body Structure ◽  
X Ray ◽  
Zinc Blende ◽  
Plausible Mechanism ◽  
Composition Structure ◽  
Zinc Blende Structure

Oxides of copper formed at an air pressure 0.5 mm of Hg in the temperature range 200° C to 1030° C and for a time of formation of one hour have been studied. Their composition structure by the method of electron diffraction and X-ray reflection, rectification, and magnetic susceptibility — all these as a function of the subsequent heat treatment and the thickness of the film — have been investigated. The films formed at 500° C just begin to show rectification, it becomes appreciable at 800° C and then increases rapidly with the temperature of formation of the film. The rectifying films are all Cu2O films but with a peculiar structure. The appearance of an appreciable amount of rectification is accompanied by changes in the surface structure, body structure and the susceptibility of the films. For a rectifying film the surface layer consists of large Cu2O crystals showing 111 orientation. Below this small crystallites of Cu2O, including an excess of oxygen, and showing a zinc blende structure, are present. The effect of the subsequent heat treatment is to reduce the amount of oxygen and increase the diamagnetic susceptibility. A maximum rectification is obtained, when the Cu2O crystallites are fairly small and contain on an average an excess of one atom of oxygen per crystallite. A plausible mechanism for the changes is suggested.

Influence of Heat Treatment on the Microstructures and Properties of Mg-12Li-3Gd-3Y-0.6Zr Alloy

2013 ◽  
Vol 800 ◽  
pp. 375-378
Author(s):  
Jian Feng ◽  
Jin Liang Huang ◽  
Yu Xin Jia
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Solid Solution ◽  
Tensile Strength ◽  
Tensile Test ◽  
Optical Microscopy ◽  
Phase Structure ◽  
Aging Treatment ◽  
Argon Atmosphere ◽  
X Ray

A new kind of Mg-12Li-3Gd-3Y-0.6Zr alloys was prepared in vacuum conditions with the protection of argon atmosphere. The effects of heat treatment on the microstructure and mechanical properties of Mg-12Li-3Gd-3Y-0.6Zr alloy were studied by optical microscopy, SEM, XRD and tensile test. The results show that the highest tensile strength of the alloy reaches 142MPa after aging treatment at 373K for 2h, and the best elongation of the alloy reaches 54% after solid solution and aging treatment at 673K for 2h + 373K for 2h. The X-ray analysis of the investigated alloy shows that the phase structure of the investigated alloy is β-Li, Mg2Gd and Mg24Y5.

scholarly journals Tensile tests of crystals of an aluminium zinc alloy

1925 ◽  
Vol 109 (749) ◽  
pp. 143-149 ◽  
Keyword(s):  
Heat Treatment ◽  
Solid Solution ◽  
Surface Layer ◽  
Tensile Tests ◽  
Zinc Alloy ◽  
Pure Aluminium ◽  
Cubic Symmetry ◽  
X Ray ◽  
Test Pieces ◽  
Small Test

By the method of straining and heat treatment large crystals were grown in an alloy of aluminium containing 18·6 per cent. zinc. This alloy is very near the limit of solubility of zinc in aluminium, but the microstructure showed it to be a solid solution. The most favourable extension was 1 per cent., with a load of 12·2 tons per square inch. The crystals were not so large as those obtained for pure aluminium, rarely exceeding 2 inches in length and 0·5 inch in diameter. They were frequently covered with a surface layer of smaller crystals of varying size. These were removed by machining. Small test pieces were made varying in length from 1 to 2 inches over the parallel portion and having a diameter of from 0·05 to 0·25 inch. The crystals gave excellent X-ray reflections. The structure appears to be similar to pure aluminium, but has a slightly larger lattice, viz., 4·18 Å compared with 4·06 Å for pure aluminium. Reflections from both cubic and octahedral planes were obtained. The angles calculated between each pair of planes showed that the crystals had cubic symmetry.

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