Multiple-method CTOA Stable Tearing Characterization of Three Metallic Alloys

2012 ◽  
Vol 40 (6) ◽  
pp. 104463
Author(s):  
Elizabeth Frink ◽  
Kevin Lease
Keyword(s):  
Metallic Alloys ◽  
Multiple Method ◽  
Stable Tearing

Contribution of a New Generation Field-Emission Scanning Electron Microscope in the Understanding of a 2099 Al-Li Alloy

2012 ◽  
Vol 18 (6) ◽  
pp. 1393-1409 ◽  
Author(s):  
Nicolas Brodusch ◽  
Michel Trudeau ◽  
Pierre Michaud ◽  
Lisa Rodrigue ◽  
Julien Boselli ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Field Emission ◽  
Scanning Transmission Electron Microscope ◽  
Metallic Alloys ◽  
Rice Grain ◽  
Scanning Transmission ◽  
The Matrix ◽  
Aluminum Lithium ◽  
Scanning Electron

AbstractAluminum-lithium alloys are widespread in the aerospace industry. The new 2099 and 2199 alloys provide improved properties, but their microstructure and texture are not well known. This article describes how state-of-the-art field-emission scanning electron microscopy (FE-SEM) can contribute to the characterization of the 2099 aluminum-lithium alloy and metallic alloys in general. Investigations were carried out on bulk and thinned samples. Backscattered electron imaging at 3 kV and scanning transmission electron microscope imaging at 30 kV along with highly efficient microanalysis permitted correlation of experimental and expected structures. Although our results confirm previous studies, this work points out possible substitutions of Mg and Zn with Li, Al, and Cu in the T1 precipitates. Zinc and magnesium are also present in “rice grain”–shaped precipitates at the grain boundaries. The versatility of the FE-SEM is highlighted as it provides information in the macro- and microscales with relevant details. Its ability to probe the distribution of precipitates from nano- to microsizes throughout the matrix makes FE-SEM an essential technique for the characterization of metallic alloys.

scholarly journals Fabrication and characterization of aluminum, gold-tin and titanium-tungsten alloys for mid-infrared plasmonic applications

2021 ◽  
Vol 2015 (1) ◽  
pp. 012149
Author(s):  
J Spettel ◽  
G Stocker ◽  
T D Dao ◽  
R Jannesari ◽  
A Tortschanoff ◽  
...  
Keyword(s):  
Spectroscopic Ellipsometry ◽  
Metallic Alloys ◽  
Mid Infrared ◽  
Tungsten Alloys ◽  
Specular Reflectance ◽  
Angle Dependence ◽  
Aluminum Metal ◽  
Fabrication And Characterization ◽  
Free Beam

Abstract We numerically and experimentally investigate aluminum metal (Al), gold-tin (AuSn) and titanium-tungsten (TiW) metallic alloys as plasmonic materials in the mid-infrared (MIR) region using spectroscopic ellipsometry and reflection measurements of gratings. The angle dependence of the specular reflectance of shallow gratings is investigated using a free-beam measurement setup and compared to simulations. It is shown that the deep and narrow resonances observed for all three materials match the associated prediction from simulations.

scholarly journals Microstructures and Metallographic Characterization of Superalloys

2019 ◽  
Vol 6 ◽  
Author(s):  
Patrice Berthod
Keyword(s):  
Solid Solution ◽  
High Temperature ◽  
Chemical Properties ◽  
Metallic Alloys ◽  
Industrial Scale ◽  
Chemical Compositions ◽  
Electronic Microscopy ◽  
Different Types ◽  
And Chemical Properties

Superalloys are metallic alloys with specific microstructures and atoms in solid solution allowing good mechanical and chemical properties at high temperature, typically higher than 1000°C. They present many different types of {matrix – precipitates} combinations which can be characterized at each step of their elaboration, by specifying the chemical compositions and the crystalline network of the phases present. After test on a sample (laboratory scale), or after the deterioration in service of a component leading to its replacement by a new one (industrial scale), the superalloys constituting these pieces are often usefully examined. This aims to specify the changes occurred in their microstructures as well as in their surface or sub-surface, due to the endured thermal, mechanical and chemical solicitations. These characterizations can be simply done using basic low-magnification optical microscopic examinations. Other means such as electronic microscopy and other advanced apparatus may be usefully involved for further investigations. After a brief history about superalloys, an overview of the phenomenological aspects of their mechanical and chemical solicitations during their use at high temperature, the metallographic techniques which are usually employed to characterize them are presented and illustrated in the case of a chosen family of superalloys.

A Study of Phase Transformations in Complex Metallic Alloys Al73Mn23Pd4 and Al73Mn21Pd6

2011 ◽  
Vol 465 ◽  
pp. 302-305
Author(s):  
Pavol Priputen ◽  
Ivona Černičková ◽  
Martin Kusý ◽  
Emília Illeková ◽  
Peter Švec ◽  
...  
Keyword(s):  
Thermal Cycling ◽  
Phase Transformations ◽  
Microstructure Characterization ◽  
Metallic Alloys ◽  
Water Quenching ◽  
Double Phase ◽  
The Stability ◽  
T Phase ◽  
Complex Metallic Alloys

The microstructure characterization of Al73Mn23Pd4 and Al73Mn21Pd6 alloys was done after annealing at 900°C for 312 h and subsequent water quenching, as well as after thermal cycling. DTA and EDX/WDX/SEM techniques were used in the investigation. It was found out that the alloys consist of the single ternary T-phase after annealing and water quenching. The DTA experiment confirmed the stability of this phase also at lower temperatures. After DTA, the alloys exhibited double-phase microstructure consisting of the ternary T-phase and probably the icosahedral I-phase. It was proved an incongruent transformation of the ternary T-phase into the liquid and vice versa.

Fatigue Characterization of Functionally Graded Metallic Alloys

2008 ◽  
Author(s):  
F. S. Silva ◽  
Glaucio H. Paulino ◽  
Marek-Jerzy Pindera ◽  
Robert H. Dodds ◽  
Fernando A. Rochinha ◽  
...  
Keyword(s):  
Functionally Graded ◽  
Metallic Alloys

scholarly journals Do You See What I See?

2021 ◽  
Vol 5 (1) ◽  
pp. 42-61
Author(s):  
Sandra Tullio-Pow ◽  
Hong Yu ◽  
Megan Strickfaden
Keyword(s):  
Visual Impairment ◽  
Social Factors ◽  
Systems Approach ◽  
Ecological Systems ◽  
Shopping Malls ◽  
Complex Environments ◽  
Factors Affecting ◽  
Multiple Method ◽  
Improved Design

   This article reports on the shopping experiences of people with visual impairment (n = 7) and offers an alternative way to understand their needs. Our study adopted taskscape theory and multiple-method ethnographic perspectives to obtain viewpoints of shoppers with visual impairment and examined shopping activities through two lenses (wayfinding and signage) to determine criteria for improved design. We used taskscape theory to gain insights into how this population perceives signage as well as a participatory, human ecological, systems approach to identify the complexity of wayfinding among people with visual impairment. We used observation, notetaking, photography, and interviews to gain insights into personal and social factors affecting participants’ experiences when navigating in shopping malls. Our data-driven results include a characterization of seven activities—pre-shopping, traveling to the mall, mall navigation, in-store navigation, merchandise evaluation, checkout, and post-shopping—within the shopping taskscape of shoppers with visual impairments that help assess user needs regarding signage and wayfinding. The shopping taskscape provides a systems approach to advance ideas around designing complex environments for able-bodied people and those with disability. 

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