Real-time stress evolution during laser surface line hardening at varying maximum surface temperatures using synchrotron X-ray diffraction

2021 ◽  
Vol 140 ◽  
pp. 106964
Author(s):  
D. Kiefer ◽  
N. Simon ◽  
F. Beckmann ◽  
F. Wilde ◽  
J. Gibmeier
Keyword(s):  
Real Time ◽  
Laser Surface ◽  
Stress Evolution ◽  
X Ray Diffraction ◽  
X Ray ◽  
Maximum Surface ◽  
Time Stress ◽  
Surface Temperatures

Real-Time Composition And Thickness Control Techniques In A Metalorganic Chemical Vapor Deposition Process

1995 ◽  
Vol 406 ◽  
Author(s):  
M. S. Gaffneyt ◽  
C. M. Reavesl ◽  
A. L Holmes ◽  
R. S. Smith ◽  
S. P. DenBaars
Keyword(s):  
Chemical Vapor Deposition ◽  
Real Time ◽  
Vapor Deposition ◽  
Metalorganic Chemical Vapor Deposition ◽  
Chemical Vapor ◽  
Normal Operation ◽  
Growth Monitoring ◽  
X Ray Diffraction ◽  
X Ray ◽  
Metalorganic Chemical

AbstractMetalorganic chemical vapor deposition (MOCVD) is a process used to manufacture electronic and optoelectronic devices that has traditionally lacked real-time growth monitoring and control. We have developed control strategies that incorporate monitors as real-time control sensors to improve MOCVD growth. An analog control system with an ultrasonic concentration monitor was used to reject bubbler concentration disturbances which exist under normal operation, during the growth of a four-period GaInAs/InP superlattice. Using X-ray diffraction, it was determined that the normally occurring concentration variations led to a wider GaInAs peak in the uncompensated growths as compared to the compensated growths, indicating that closed loop control improved GaInAs composition regulation. In further analysis of the X-ray diffraction curves, superlattice peaks were used as a measure of high crystalline quality. The compensated curve clearly displayed eight orders of satellite peaks, whereas the uncompensated curve shows little evidence of satellite peaks.

Real‐time wide‐angle X‐ray diffraction during polyethylene blown film extrusion

2008 ◽  
Vol 48 (8) ◽  
pp. 1487-1494 ◽  
Author(s):  
Giri Gururajan ◽  
H. Shan ◽  
G. Lickfield ◽  
A.A. Ogale
Keyword(s):  
Real Time ◽  
Wide Angle ◽  
X Ray Diffraction ◽  
X Ray ◽  
Film Extrusion ◽  
Blown Film ◽  
Blown Film Extrusion

Investigation of Stress Evolution Induced by Electromigration in Sn-Ag-Cu Solder Joints Based on an X-Ray Diffraction Technique

2011 ◽  
Vol 41 (2) ◽  
pp. 425-430 ◽  
Author(s):  
Limin Ma ◽  
Fu Guo ◽  
Guangchen Xu ◽  
Xitao Wang ◽  
Hongwen He ◽  
...  
Keyword(s):  
Solder Joints ◽  
Stress Evolution ◽  
X Ray Diffraction ◽  
X Ray

Dynamics of the nanocrystal structure and composition in growth solutions monitored by in situ lab-scale X-ray diffraction

Nanoscale ◽  
2021 ◽  
Author(s):  
Helena Fridman ◽  
Michael Volokh ◽  
Taleb Mokari
Keyword(s):  
Real Time ◽  
Growth Dynamics ◽  
X Ray Diffraction ◽  
X Ray ◽  
Nanocrystal Growth ◽  
Novel Approach ◽  
Phase Size ◽  
Time Observation ◽  
Real Time Observation

Nanocrystal growth dynamics are investigated by a novel approach: real-time observation of nanocrystals in growth solutions using lab-scale in situ X-ray diffraction. The method reveals the evolution of crystal phase, size, shape, and composition.

scholarly journals Non-Isothermal Crystallization Behavior of PEEK/Graphene Nanoplatelets Composites from Melt and Glass States

Polymers ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 124 ◽  
Author(s):  
Ángel Alvaredo ◽  
María Martín ◽  
Pere Castell ◽  
Roberto Guzmán de Villoria ◽  
Juan Fernández-Blázquez
Keyword(s):  
Real Time ◽  
Orthorhombic Phase ◽  
Complex Viscosity ◽  
Crystallization Time ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Chain Mobility ◽  
Peek Composite ◽  
Poly Ether Ether Ketone

The effect of the graphene nanoplateletets (GNP), at concentration of 1, 5 and 10 wt %, in Poly ether ether ketone (PEEK) composite crystallization from melt and during cold crystallization were investigated by differential scanning calorimetry (DSC) and real time X-ray diffraction experiments. DSC results revealed a double effect of GNP: (a) nucleating effect crystallization from melt started at higher temperatures and (b) longer global crystallization time due to the restriction in the polymer chain mobility. This hindered mobility were proved by rheological behavior of nanocomposites, because to the increase of complex viscosity, G′, G″ with the GNP content, as well as the non-Newtonian behavior found in composites with high GNP content. Finally, real time wide and small angle synchrotron X-ray radiation (WAXS/SAXS) X-ray measurements showed that GNP has not affected the orthorhombic phase of PEEK nor the evolution of the crystal phase during the crystallization processes. However, the correlation length of the crystal obtained by WAXS and the long period (L) by SAXS varied depending on the GNP content.

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