Interrelationships between Asphaltene Precipitation Inhibitor Effectiveness, Asphaltenes Characteristics, and Precipitation Behavior duringn-Heptane (Light Paraffin Hydrocarbon)-Induced Asphaltene Precipitation

2004 ◽  
Vol 18 (4) ◽  
pp. 1038-1048 ◽  
Author(s):  
Hussam H. Ibrahim ◽  
Raphael O. Idem
Keyword(s):  
Paraffin Hydrocarbon ◽  
Asphaltene Precipitation ◽  
Precipitation Behavior ◽  
Precipitation Inhibitor

Choline chloride/monoethylene glycol deep eutectic solvent as a new asphaltene precipitation inhibitor

2017 ◽  
Vol 35 (19) ◽  
pp. 1896-1902 ◽  
Author(s):  
Shahin Jahangiri ◽  
Abbas Shahrabadi ◽  
Akbar Heydari ◽  
Soheila Javadian ◽  
Ali Hekmat Nazemi ◽  
...  
Keyword(s):  
Choline Chloride ◽  
Deep Eutectic Solvent ◽  
Asphaltene Precipitation ◽  
Precipitation Inhibitor ◽  
Monoethylene Glycol

How Acid Gas Affects Asphaltene Precipitation Behavior

2014 ◽  
Author(s):  
Hideharu Yonebayashi ◽  
Katsumo Takabayashi ◽  
Ryo Iizuka ◽  
Slavko Tosic
Keyword(s):  
Asphaltene Precipitation ◽  
Precipitation Behavior ◽  
Acid Gas

Developing Thermodynamic Micellization Approach to Model Asphaltene Precipitation Behavior

2014 ◽  
Vol 35 (9) ◽  
pp. 1325-1338 ◽  
Author(s):  
Siavash Ashoori ◽  
Behnam Shahsavani ◽  
Mohammad Ali Ahmadi ◽  
Ahmad Rezaei
Keyword(s):  
Asphaltene Precipitation ◽  
Precipitation Behavior

Precipitation in Al-Li-Cu Alloys

1981 ◽  
Vol 39 ◽  
pp. 44-45
Author(s):  
J. E. O'Neal ◽  
K. K. Sankaran
Keyword(s):  
Electron Microscopy ◽  
Age Hardening ◽  
Precipitation Behavior ◽  
Zone Formation ◽  
Specific Strength ◽  
Hardening Behavior ◽  
Cu Alloys ◽  
High Specific Strength ◽  
Transmission Electron ◽  
Structural Applications

Al-Li-Cu alloys combine high specific strength and high specific modulus and are potential candidates for aircraft structural applications. As part of an effort to optimize Al-Li-Cu alloys for specific applications, precipitation in these alloys was studied for a range of compositions, and the mechanical behavior was correlated with the microstructures.Alloys with nominal compositions of Al-4Cu-2Li-0.2Zr, Al-2.5Cu-2.5Li-0.2Zr, and Al-l.5Cu-2.5Li-0.5Mn were argon-atomized into powder at solidification rates ≈ 103°C/s. Powders were consolidated into bar stock by vacuum pressing and extruding at 400°C. Alloy specimens were solution annealed at 530°C and aged at temperatures up to 250°C, and the resultant precipitation was studied by transmission electron microscopy (TEM).The low-temperature (≲100°C) precipitation behavior of the Al-4Cu-2Li-0.2Zr alloy is a combination of the separate precipitation behaviors of Al-Cu and Al-Li alloys. The age-hardening behavior at these temperatures is characteristic of Guinier-Preston (GP) zone formation, with additional strengthening resulting from the coherent precipitation of δ’ (Al3Li, Ll2 structure), the presence of which is revealed by the selected-area diffraction pattern (SADP) shown in Figure la.

The coprecipitation of Cr3P and Cr in Cu

1988 ◽  
Vol 46 ◽  
pp. 764-765
Author(s):  
M.J. Witcomb ◽  
U. Dahmen ◽  
K.H. Westmacott
Keyword(s):  
Orientation Relationship ◽  
Interface Structure ◽  
Model System ◽  
Relative Orientation ◽  
Age Hardening ◽  
Precipitation Behavior ◽  
Solution Treated ◽  
Small Needle ◽  
Diffraction Patterns ◽  
Interface Structures

Cu-Cr age-hardening alloys are of interest as a model system for the investigation of fcc/bcc interface structures. Several past studies have investigated the morphology and interface structure of Cr precipitates in a Cu matrix (1-3) and good success has been achieved in understanding the crystallography and strain contrast of small needle-shaped precipitates. The present study investigates the effect of small amounts of phosphorous on the precipitation behavior of Cu-Cr alloys.The same Cu-0.3% Cr alloy as was used in earlier work was rolled to a thickness of 150 μm, solution treated in vacuum at 1050°C for 1h followed by quenching and annealing for various times at 820 and 863°C.Two laths and their corresponding diffraction patterns in an alloy aged 2h at 820°C are shown in correct relative orientation in Fig. 1. To within the limit of accuracy of the diffraction patterns the orientation relationship was that of Kurdjumov-Sachs (KS), i.e. parallel close-packed planes and directions.

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