scholarly journals The structure, properties and performance of plasma-sprayed beryllium for fusion applications

1996 ◽  
Vol T64 ◽  
pp. 77-83 ◽  
Author(s):  
Richard G Castro ◽  
Paul W Stanek ◽  
Keith E Elliott ◽  
Dennis L Youchison ◽  
Robert D Watson ◽  
...  
Author(s):  
D. E. Newbury ◽  
R. D. Leapman

Trace constituents, which can be very loosely defined as those present at concentration levels below 1 percent, often exert influence on structure, properties, and performance far greater than what might be estimated from their proportion alone. Defining the role of trace constituents in the microstructure, or indeed even determining their location, makes great demands on the available array of microanalytical tools. These demands become increasingly more challenging as the dimensions of the volume element to be probed become smaller. For example, a cubic volume element of silicon with an edge dimension of 1 micrometer contains approximately 5×1010 atoms. High performance secondary ion mass spectrometry (SIMS) can be used to measure trace constituents to levels of hundreds of parts per billion from such a volume element (e. g., detection of at least 100 atoms to give 10% reproducibility with an overall detection efficiency of 1%, considering ionization, transmission, and counting).


2021 ◽  
pp. 778-786
Author(s):  
Ellen E. Wright ◽  
Suzanne F. Uchneat

Abstract This article focuses on failure analyses of aircraft components from a metallurgical and materials engineering standpoint, which considers the interdependence of processing, structure, properties, and performance of materials. It discusses methodologies for conducting aircraft investigations and inspections and emphasizes cases where metallurgical or materials contributions were causal to an accident event. The article highlights how the failure of a component or system can affect the associated systems and the overall aircraft. The case studies in this article provide examples of aircraft component and system-level failures that resulted from various factors, including operational stresses, environmental effects, improper maintenance/inspection/repair, construction and installation issues, manufacturing issues, and inadequate design.


Author(s):  
Z. Mutasim ◽  
C. Rimlinger ◽  
W. Brentnall

Laboratory testing was conducted on air plasma sprayed (APS) and electron beam-physical vapor deposited (EB-PVD) thermal barrier coatings (TBCs) applied onto nickel alloy specimens. As-coated chemistry, microstructure, and bond strength of the TBC systems were evaluated. Cyclic oxidation tests that simulated industrial gas turbine environments were also conducted on the various thermal barrier coatings. This study evaluated the effects of ceramic and metallic coating compositions and application processes on coatings microstructure and performance. The relative cyclic performance of the TBC systems was determined from the laboratory tests.


1987 ◽  
Vol 5 (6) ◽  
pp. 3425-3429 ◽  
Author(s):  
B. Terreault ◽  
C. Boucher ◽  
P. L. Andrew ◽  
A. A. Haasz ◽  
C. Brunet ◽  
...  

Metal Science ◽  
1974 ◽  
Vol 8 (1) ◽  
pp. 129-131 ◽  
Author(s):  
I. L. Dillamore

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