Fabrication of microscale materials with programmable composition gradients

Lab on a Chip ◽  
2016 ◽  
Vol 16 (7) ◽  
pp. 1234-1242 ◽  
Author(s):  
Cédric Laval ◽  
Anne Bouchaudy ◽  
Jean-Baptiste Salmon
Keyword(s):  
Composition Gradients

Fabrication of microscale materials with programmable composition gradients using the coupling of pervaporation and Quake valves.

Emerging Capabilities for the High-Throughput Characterization of Structural Materials

2021 ◽  
Vol 51 (1) ◽  
Author(s):  
Daniel B. Miracle ◽  
Mu Li ◽  
Zhaohan Zhang ◽  
Rohan Mishra ◽  
Katharine M. Flores
Keyword(s):  
High Throughput ◽  
Materials Science ◽  
Structural Materials ◽  
Rapid Screening ◽  
Annual Review ◽  
Publication Date ◽  
Synthesis Methods ◽  
Alloy Development ◽  
Composition Gradients ◽  
Future Vision

Structural materials have lagged behind other classes in the use of combinatorial and high-throughput (CHT) methods for rapid screening and alloy development. The dual complexities of composition and microstructure are responsible for this, along with the need to produce bulk-like, defect-free materials libraries. This review evaluates recent progress in CHT evaluations for structural materials. High-throughput computations can augment or replace experiments and accelerate data analysis. New synthesis methods, including additive manufacturing, can rapidly produce composition gradients or arrays of discrete alloys-on-demand in bulk form, and new experimental methods have been validated for nearly all essential structural materials properties. The remaining gaps are CHT measurement of bulk tensile strength, ductility, and melting temperature and production of microstructural libraries. A search strategy designed for structural materials gains efficiency by performing two layers of evaluations before addressing microstructure, and this review closes with a future vision of the autonomous, closed-loop CHT exploration of structural materials. Expected final online publication date for the Annual Review of Materials Science, Volume 51 is August 2021. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.

Microstructure Stability of Alloy 740H and its Effect on Material Properties

2014 ◽  
Author(s):  
John J. de Barbadillo ◽  
Brian A. Baker ◽  
Xishan Xie
Keyword(s):  
Large Diameter ◽  
Coal Ash ◽  
Pilot Scale ◽  
Current Status ◽  
Steam Boiler ◽  
Hardened Alloy ◽  
Diameter Pipe ◽  
Nickel Base ◽  
Composition Gradients ◽  
Product Forms

Alloy 740H was developed specifically for boiler tube and steam transfer pipe for the Advanced-Ultrasupercritical steam boiler application. The composition was formulated to provide creep strength, weldability and oxidation and coal ash corrosion resistance. It is the first nickel-base age-hardened alloy to be approved under Section 1 of the ASME Boiler and Pressure Vessel Code. Although a significant amount of microstructure and creep data was submitted to support the code case, it was largely collected on tube and light plate, much of this from pilot-scale material. The data package did not cover other product forms, sizes, hot working methods and weld joint configurations that may be required to construct a power plant. These include large diameter pipe, bends, fittings, heavy section welds, dissimilar metal welds, etc. that have complex thermal cycles and composition gradients. An ongoing effort is underway to characterize the microstructure and properties of alloy 740H under a range of manufacturing processes and to project these results through the potential life cycle of a plant. This paper describes the current status of this work. Paper published with permission.

Material Composition Gradients and Protein Release for Tracheal Defect Repair

2013 ◽  
Author(s):  
Lindsey Ott ◽  
Cindy Vu ◽  
Ashley Farris ◽  
Robert Weatherly ◽  
Michael Detamore
Keyword(s):  
Quality Of Life ◽  
Donor Site ◽  
Donor Site Morbidity ◽  
Prosthetic Material ◽  
Tracheal Defect ◽  
Laryngotracheal Reconstruction ◽  
Augmentation Techniques ◽  
Defect Repair ◽  
Composition Gradients

Windpipe defects result in decreased quality of life for the patient, making breathing, speaking, and swallowing difficult. Disorders of the trachea requiring intervention methods not adequately treated by slide tracheoplasty or cartilage augmentation necessitate the use of prosthetic material to expand the trachea. Furthermore, some donor site morbidity occurs with augmentation techniques and size or shape mismatches are not uncommon. Tissue engineering has the potential to create effective replacement trachea-like tissue for procedures like laryngotracheal reconstruction and may circumvent these problems.

scholarly journals Gravity-mode period spacings and near-core rotation rates of 611 γ Doradus stars with Kepler

2019 ◽  
Author(s):  
Gang Li ◽  
Timothy Van Reeth ◽  
Timothy R Bedding ◽  
Simon J Murphy ◽  
Victoria Antoci ◽  
...  
Keyword(s):  
Rotation Rate ◽  
Rotation Rates ◽  
The Core ◽  
Surface Rotation ◽  
Kepler Mission ◽  
Large Spread ◽  
Amplitude Spectra ◽  
Core Rotation ◽  
Composition Gradients ◽  
Gravity Mode

Abstract We report our survey of γ Dor stars from the 4-yr Kepler mission. These stars pulsate mainly in g modes and r modes, showing period-spacing patterns in the amplitude spectra. The period-spacing patterns are sensitive to the chemical composition gradients and the near-core rotation, hence they are essential for understanding the stellar interior. We identified period-spacing patterns in 611 γ Dor stars. Almost every star pulsates in dipole g modes, while about 30% of stars also show clear patterns for quadrupole g modes and 16% of stars present r mode patterns. We measure periods, period spacings, and the gradient of the period spacings. These three observables guide the mode identifications and can be used to estimate the near-core rotation rate. We find many stars are hotter and show longer period-spacing patterns than theory. Using the Traditional Approximation of Rotation (TAR), we inferred the asymptotic spacings, the near-core rotation rates, and the radial orders of the g and r modes. Most stars have a near-core rotation rate around 1 d−1and an asymptotic spacing around 4000 s. We also find that many stars rotate more slowly than predicted by theory for unclear reasons. 11 stars show rotational splittings with fast rotation rates. We compared the observed slope–rotation relation with the theory and find a large spread. We detected rotational modulations in 58 stars and used them to derive the core-to-surface rotation ratios. The interiors rotate faster than the cores in most stars, but by no more than 5%.

Anomalous currents determined by SVET due to composition gradients on corroding Zn surfaces in 0.1 M NaCl

2020 ◽  
Vol 24 (8) ◽  
pp. 1889-1898 ◽  
Author(s):  
Vinicius Cerveira ◽  
Natália F. Lopes ◽  
Luís F. P. Dick
Keyword(s):  
Composition Gradients

scholarly journals Chemically graded Fe–Al/steel samples fabricated by laser metal deposition

MRS Advances ◽  
2017 ◽  
Vol 2 (26) ◽  
pp. 1393-1398 ◽  
Author(s):  
Saeid Lotfian ◽  
Gesa Rolink ◽  
Andreas Weisheit ◽  
Martin Palm
Keyword(s):  
Metal Deposition ◽  
Concentration Profiles ◽  
Laser Metal Deposition ◽  
Concentration Gradients ◽  
Long Term Stability ◽  
Wavelength Dispersive Spectrometry ◽  
Heat Treated ◽  
Composition Gradients ◽  
Scanning Electron

ABSTRACTBy laser metal deposition (LMD) samples from Fe–28Al (at.%) have been built on iron and various steels. Chemically graded iron aluminium and Fe–28Al/steel samples were fabricated with intended concentration gradients by controlling the feed rates of the powders. All samples were subsequently heat treated at 700 °C for 1000 h to study possible reactions between Fe–28Al and the steels and the long-term stability of the composition gradients. Microstructures were characterized by scanning electron microscopy (SEM) and concentration profiles along the building direction were analysed by energy- and wavelength-dispersive spectrometry (EDS, WDS).

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