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in subjects: "microstructure"  
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Postirradiation Examinations of Fuel Pins from the GCFR F-1 Series of Mixed-Oxide Fuel Pins at 5. 5 at. % Burnup

Description: Postirradiation examinations were performed on five fuel pins from the Gas-Cooled Fast-Breeder Reactor F-1 experiment irradiated in EBR-II to a peak burnup of approximately 5.5 at. %. These encapsulated fuel pins were irradiated at peak-power linear ratings from approximately 13 to 15 kW/ft and peak cladding inside diameter temperatures from approximately 625 to 760°C. The maximum diametral change that occurred during irradiation was 0.2% .delta.D/D₀. The maximum fuel-cladding chemical interact… more
Date: May 1978
Creator: Johnson, C. E. & Strain, R. V.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The Influence of Particle Morphology and Heat Treatment on the Microstructural Evolution of Silver Inks for Additively Manufactured RF Applications: A Comparison between Nanoflake and Reactive Inks

Description: In recent years, advancements in additive manufacturing (AM) technologies have paved the way for 3D-printed flexible hybrid electronics (FHE) and created opportunities for extending these gains to RF applications. However, printed metal interconnects and devices are typically characterized by high porosity and chemical impurities that significantly limit their electrical conductivity and RF performance compared to bulk equivalents. Using direct ink writing (DIW), two silver inks, a nanoflake su… more
Date: May 2023
Creator: Summers, Jason Masao
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Evolution of microstructure and mechanical properties in gas tungsten arc welded dual-phase Fe50Mn30Co10Cr10 high entropy alloy

Description: Article describes how in recent years, high entropy alloys (HEAs) have been shown to be promising alternatives to common engineering alloys, depending on their composition and thermomechanical processing. In the present work, Gas Tungsten Arc Welding (GTAW) was used to achieve defect-free joints based on a novel transformation induced plasticity (TRIP) Fe50Mn30Co10Cr10 HEA.
Date: June 3, 2023
Creator: Lopes, J. G.; Agrawal, Priyanka; Shen, Jiajia; Schell, N.; Mishra, R. S. & Oliveira, J. P.
Item Type: Refine your search to only Article
Partner: UNT College of Science
open access

Role of TiB2 inoculation particles during welding of a AlCoCrFeNi high entropy alloy

Description: This article states that high entropy alloys are a novel class of materials that represent an evolution of common engineering alloys to a wider array of compositional and properties possibilities. The exploration of methodologies to achieve improved microstructure and mechanical characteristics of these materials for potential applications in industry is a requirement that is experiencing extended research efforts. The integration of high temperature inoculant particles on the fusion zone durin… more
Date: May 10, 2024
Creator: Lopes, J. G.; Candeias, A.; Agrawal, P.; Shen, J.; Schell, N.; Mishra, R. S. et al.
Item Type: Refine your search to only Article
Partner: UNT College of Engineering
open access

Processing, Pre-Aging, and Aging of NiTi-Hf (15-20 at.%) High Temperature Shape Memory Alloy from Laboratory to Industrial Scale

Description: The overarching goal of this research was to generate a menu of shape memory alloys (SMAs) actuator materials capable of meeting the demands of aerospace applications. Material requirements were recognized to meet the demand for high temperature SMAs with actuating temperatures above 85 °C and provide material options capable of performing over 100K actuation cycles. The first study is a preliminary characterization for the down selection of Ni-rich NiTiHf15 compositions chosen for a more in-de… more
Date: December 2020
Creator: Gantz, Faith
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

A Study on NiTiSn Low-Temperature Shape Memory Alloys and the Processing of NiTiHf High-Temperature Shape Memory Alloys

Description: Shape memory alloys (SMAs) operating as solid-state actuators pose economic and environmental benefits to the aerospace industry due to their lightweight, compact design, which provides potential for reducing fuel emissions and overall operating cost in aeronautical equipment. Despite wide applicability, the implementation of SMA technology into aerospace-related actuator applications is hindered by harsh environmental conditions, which necessitate extremely high or low transformation temperatu… more
Date: May 2018
Creator: Young, Avery W
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Fatigue Behavior of A356 Aluminum Alloy

Description: Metal fatigue is a recurring problem for metallurgists and materials engineers, especially in structural applications. It has been responsible for many disastrous accidents and tragedies in history. Understanding the micro-mechanisms during cyclic deformation and combating fatigue failure has remained a grand challenge. Environmental effects, like temperature or a corrosive medium, further worsen and complicate the problem. Ultimate design against fatigue must come from a materials perspective … more
Date: May 2016
Creator: Nelaturu, Phalgun
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Influence of High Strain Rate Compression on Microstructure and Phase Transformation of NiTi Shape Memory Alloys

Description: Since NiTi shape memory alloy (SMA) was discovered in the early 1960s, great progress has been made in understanding the properties and mechanisms of NiTi SMA and in developing associated products. For several decades, most of the scientific research and industrial interests on NiTi SMA has focused on its superelastic applications in the biomedical field and shape memory based “smart” devices, which involves the low strain rate (around 0.001 s^-1) response of NiTi SMA. Due to either stress-indu… more
Date: May 2016
Creator: Qiu, Ying
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

An Initial Study of Binary and Ternary Ti-based Alloys Manufactured Using Laser Engineered Net Shaping (LENSTM)

Description: In this study an initial assessment of the composition – microstructure – property relationships in binary and ternary Ti – based systems are made possible using LENSTM technology. Laser Engineering Net Shaping (LENSTM), a rapid prototyping, directed laser deposition methodology of additive manufacturing (AM) was used to create bulk homogenous specimens that are compositionally graded. Compositionally graded specimens were made possible by incorporating elemental blends of powder during the LEN… more
Date: December 2015
Creator: Gray, Alyn M.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
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