scholarly journals Microstructural characterization of catalysis product of nanocement based materials: A review

2018 ◽  
Vol 34 ◽  
pp. 01039
Author(s):  
Norsuzailina Mohamed Sutan ◽  
Nur Izaitul Akma Ideris ◽  
Siti Noor Linda Taib ◽  
Delsye Teo Ching Lee ◽  
Alsidqi Hassan ◽  
...  
Keyword(s):  
Carbon Dioxide Emission ◽  
Essential Element ◽  
Microstructural Characterization ◽  
High Energy ◽  
Green Technology ◽  
Microstructural Development ◽  
Cement Replacement ◽  
Alternative Materials ◽  
Partial Cement Replacement

Cement as an essential element for cement-based products contributed to negative environmental issues due to its high energy consumption and carbon dioxide emission during its production. These issues create the need to find alternative materials as partial cement replacement where studies on the potential of utilizing silica based materials as partial cement replacement come into picture. This review highlights the effectiveness of microstructural characterization techniques that have been used in the studies that focus on characterization of calcium hydroxide (CH) and calcium silicate hydrate (C-S-H) formation during hydration process of cement-based product incorporating nano reactive silica based materials as partial cement replacement. Understanding the effect of these materials as cement replacement in cement based product focusing on the microstructural development will lead to a higher confidence in the use of industrial waste as a new non-conventional material in construction industry that can catalyse rapid and innovative advances in green technology.

scholarly journals Processing and microstructural characterization of a Ti-Cr-Nb alloy synthesized by high-energy ball-milling

2012 ◽  
Vol 15 (5) ◽  
pp. 753-756 ◽  
Author(s):  
José Fernando Ribeiro de Castro ◽  
Sydney Ferreira Santos ◽  
Tomaz Ishikawa ◽  
Walter José Botta
Keyword(s):  
Ball Milling ◽  
Microstructural Characterization ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Energy Ball

Characterization of Ti-35Nb-7Zr-5Ta Alloy Produced by Powder Metallurgy

2005 ◽  
Vol 498-499 ◽  
pp. 34-39 ◽  
Author(s):  
Elisa B. Taddei ◽  
Vinicius André Rodrigues Henriques ◽  
Cosme Roberto Moreira Silva ◽  
Carlos Alberto Alves Cairo
Keyword(s):  
Powder Metallurgy ◽  
Titanium Alloys ◽  
Microstructural Characterization ◽  
Cold Isostatic Pressing ◽  
Microstructural Development ◽  
Potential Toxic Elements ◽  
Metallic Biomaterials ◽  
Low Modulus ◽  
Orthopedic Applications

Abstract: Titanium and titanium alloys present the highest biocompatibility among metallic biomaterials. The ideal titanium alloy for orthopedic applications should have low modulus of elasticity (near the bone), excellent mechanical strength, high corrosion resistance, formability and no potential toxic elements. Among titanium alloys, the Ti-35Nb-7Zr-5Ta alloy, due its high biocompatibility and lower Young’s modulus is a promising candidate for implants material. The titanium alloys production by powder metallurgy, starting from the elementary powders, is a viable route due at the smaller costs and larger operational facilities. The Ti-35Nb-7Zr-5Ta samples were manufactured by blended elemental method from a sequence of uniaxial and cold isostatic pressing with subsequent densification by sintering between 900 at 1700 °C, in vacuum, under a heating rate of 20 °C×min-1 for 1h. The objective of this work is the analysis of alloy microstructural evolution from the powders dissolution under the increase of the sintering temperature. For the alloy microstructural characterization, scanning electron microscopy and Vickers microhardness measurements, were used. Density was measured by Archimedes method. The samples presented high densification, an homogeneous microstructural development, with complete dissolution of alloying elements in the titanium matrix with the temperature increase.

scholarly journals How Austenitic Is a Martensitic Steel Produced by Laser Powder Bed Fusion? A Cautionary Tale

Metals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1924
Author(s):  
Fan Zhang ◽  
Mark R. Stoudt ◽  
Souzan Hammadi ◽  
Carelyn E. Campbell ◽  
Eric A. Lass ◽  
...  
Keyword(s):  
Electron Backscatter Diffraction ◽  
Essential Element ◽  
Microstructural Characterization ◽  
High Energy ◽  
Phase Fraction ◽  
X Ray Diffraction ◽  
X Ray ◽  
Experimental Findings ◽  
Nonequilibrium Solidification ◽  
Backscatter Diffraction

Accurate phase fraction analysis is an essential element of the microstructural characterization of alloys and often serves as a basis to quantify effects such as heat treatment or mechanical deformation. Additive manufacturing (AM) of metals, due to the intrinsic nonequilibrium solidification and spatial variability, creates additional challenges for the proper quantification of phase fraction. Such challenges are exacerbated when the alloy itself is prone to deformation-induced phase transformation. Using commonly available in-house X-ray diffraction (XRD) and electron backscatter diffraction (EBSD) and less commonly used synchrotron-based high-energy X-ray diffraction, we characterized nitrogen-atomized 17-4 precipitation-hardening martensitic stainless steel, a class of AM alloy that has received broad attention within the AM research community. On the same build, our measurements recovered the entire range of reported values on the austenite phase fractions of as-built AM 17-4 in literature, from ≈100% martensite to ≈100% austenite. Aided by Calphad simulation, our experimental findings established that our as-built AM 17-4 is almost fully austenitic and that in-house XRD and EBSD measurements are subject to significant uncertainties created by the specimen’s surface finish. Hence, measurements made using these techniques must be understood in their correct context. Our results carry significant implications, not only to AM 17-4 but also to AM alloys that are susceptible to deformation-induced structure transformation and suggest that characterizations with less accessible but bulk sensitive techniques such as synchrotron-based high energy X-ray diffraction or neutron diffraction may be required for proper understanding of these materials.

Microstructure of high-energy product Fe-Nd-B magnequench ribbons

1986 ◽  
Vol 44 ◽  
pp. 826-827
Author(s):  
Y. L. Chen
Keyword(s):  
Anisotropy Field ◽  
Microstructural Characterization ◽  
High Energy ◽  
Maximum Energy ◽  
Maximum Energy Product ◽  
Energy Product ◽  
High Anisotropy ◽  
Energy Products ◽  
Very High

Melt-spun Fe-Nd-B MAGNEQUENCH® ribbons have been produced by Croat et al. with energy products in excess of 10 MG.Oe using a relatively narrow window of composition and quenching speed. The hard magnetic phase has subsequently been identified as the Nd2Fe14B compound which has a very high anisotropy field. The microstructure of the MAGNEQUENCH® ribbon which has a maximum energy product of 14.1 MG•0e was found to consist of equiaxed Nd2Fe14B grains surrounded by a very thin intergranular film. This paper presents the results of some of our earlv work on the microstructural characterization of high energy product MAGNEQUENCH® ribbons having nominal compositions of Nd13Fe82.6B4.4 and Nd15Fe79.9B5.1. The purpose of this investigation was to characterize the microstructures of various MAGNEQUENCH® ribbons for correlation with their magnetic properties.

scholarly journals Characterization of palm oil fuel ash and eggshell powder as partial cement replacement in concrete

2018 ◽  
Vol 431 ◽  
pp. 032002
Author(s):  
N H A Khalid ◽  
N N A Rasid ◽  
A R Mohd.Sam ◽  
N H A S Lim ◽  
M Ismail ◽  
...  
Keyword(s):  
Palm Oil ◽  
Palm Oil Fuel Ash ◽  
Cement Replacement ◽  
Fuel Ash ◽  
Partial Cement Replacement ◽  
Oil Fuel

scholarly journals An Application of Blended Palm Oil Waste in Brick Production

2021 ◽  
pp. 97-105
Author(s):  
Euniza Jusli ◽  
Jen Ling ◽  
Mastura Bujang ◽  
Dayang Ali ◽  
Toh Lee
Keyword(s):  
Mechanical Properties ◽  
Palm Oil ◽  
Industrial Waste ◽  
Carbon Dioxide Emission ◽  
Physical And Mechanical Properties ◽  
Cement Industry ◽  
Major Contributor ◽  
Cement Replacement ◽  
Negative Impacts ◽  
Partial Cement Replacement

Cement brick is an essential construction component, which uses cement as the primary binder. The cement industry was identified as the major contributor to carbon dioxide emission, which is a greenhouse gas. The application of agro-industrial waste as partial cement replacement can reduce the negative impacts on the environment. In this study, the palm oil wastes, namely Palm Oil Clinker Powder (POCP) and Palm Oil Boiler Ash (POBA), were used as partial cement replacement. A total of 60 specimens were prepared with 0%, 10%, 20%, and 30% cement replacement by POCP and POBA. The physical and mechanical properties of bricks, such as density, water absorption, voids, and compressive strength, were investigated. The results show that the brick with 20% CP and BA could be used as a severe weathering brick.

Microstructure of silicon implanted with MeV gold ions

1991 ◽  
Vol 49 ◽  
pp. 876-877
Author(s):  
M.J. Kim ◽  
M. Catalano ◽  
T.P. Sjoreen ◽  
R.W. Carpenter
Keyword(s):  
Single Crystal ◽  
Ion Irradiation ◽  
Microstructural Characterization ◽  
High Energy ◽  
Ion Milling ◽  
Cross Sectional ◽  
Microstructural Investigation ◽  
Annealing Behavior ◽  
Different Doses

High-energy implantation of silicon is of great interest in recent years for microelectronics due to the formation of a buried damage or dopant layer away from the active region of the device. The damage nucleation and growth behavior is known to vary significantly along the ion's track for MeV irradiation. In this paper, a detailed characterization of the damage morphology produced by MeV gold ions for different doses into single crystal Si, as well as the associated annealing behavior, is presented.Single crystal n-type Czochralski silicon {001} wafers were implanted with Au++ ions from doses of 1x1015 to 3x1016 cm-2 at 2-3 MeV. Specimen temperatures for all implantations were 20 or 300°C. A measurement with an infrared pyrometer of the implanted surface indicated a slight temperature rise during ion irradiation. The compositional and damage profiles were determined by Rutherford backscattering/channeling spectroscopy (RBS). Cross-sectional TEM samples for microstructural characterization were prepared by mechanical polishing and ion milling. A Philips 400ST/FEG analytical microscope was used for nanoprobe experiments, at 100 kV. Microstructural investigation was performed using ISI-002B and JEM-2000FX microscopes, at 200 kV.

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