Influence of the degree of scandium supersaturation on the precipitation kinetics of rapidly solidified Al-Mg-Sc-Zr alloys

2016 ◽  
Vol 117 ◽  
pp. 43-50 ◽  
Author(s):  
J. Taendl ◽  
A. Orthacker ◽  
H. Amenitsch ◽  
G. Kothleitner ◽  
C. Poletti
Keyword(s):  
Precipitation Kinetics ◽  
Rapidly Solidified ◽  
Kinetics Of ◽  
Zr Alloys

scholarly journals The influence of Si and V on the kinetics of phase transformation and microstructure of rapidly solidified Al-Fe-Zr alloys

2013 ◽  
Vol 49 (1) ◽  
pp. 83-89 ◽  
Author(s):  
B. Karpe ◽  
B. Kosec ◽  
A. Nagode ◽  
M. Bizjak
Keyword(s):  
Electron Microscopy ◽  
Electrical Resistivity ◽  
Heating Rate ◽  
Resistivity Measurement ◽  
Electrical Resistivity Measurement ◽  
Microstructural Development ◽  
Precipitation Kinetics ◽  
Rapidly Solidified ◽  
Kinetics Of ◽  
Zr Alloys

The influence of Si and V on the precipitation kinetics of the rapidly solidified (RS) Al-Fe-Zr alloys is presented. Precipitation kinetics and microstructural development of RS Al-Fe-Zr alloys with Si or V addition have been investigated by the combination of four point electrical resistance measurement, optical microscopy, transmition electron microscopy (TEM) and scanning electron microscopy (SEM). For verification of the electrical resistivity measurement results differential scanning calorimetry (DSC) and differential thermal analysis (DTA) was also applied. Rapidly solidified samples, in the form of thin ribbons, were prepared with the single roll melt spun technique. For determination of the distinctive temperatures at which microstructural transformations occur in-situ electrical resistivity measurement during heating of the ribbons with various constant heating rates has been used. It was found that microstructure decomposition depends on heating rate and shifts to higher temperatures with increasing heating rate. After heating above the distinctive transition temperatures, heating was stopped and microstructure of the samples examined by electron microscopy.

Investigation of the Precipitation Kinetics of a New Al-Mg-Sc-Zr Alloy

2014 ◽  
Vol 794-796 ◽  
pp. 1038-1043 ◽  
Author(s):  
Johannes Taendl ◽  
Frank Palm ◽  
Kevin Anders ◽  
Rudolf Gradinger ◽  
Cecilia Poletti
Keyword(s):  
Electron Beam ◽  
Cooling Rate ◽  
Room Temperature ◽  
Rapid Quenching ◽  
Precipitation Kinetics ◽  
Hardness Testing ◽  
Precipitation Behavior ◽  
Kinetics Of ◽  
Zr Alloy ◽  
Zr Alloys

This study investigates the precipitation behavior of two similar cast Al-Mg-Sc-Zr alloys with different solidification and cooling rates. Microstructural analyses and hardness testing were performed after casting and ageing. In addition, the precipitation and hardness evolution after rapid quenching using electron beam re-solidification were studied. It was shown that the amount of Al3(Sc,Zr) phases present after casting or re-solidification increases with decreasing solidification and cooling rate. Consequently, the degree of supersaturation in Sc and Zr at room temperature and thus the hardening potential in a subsequent ageing process increases with the solidification and cooling rate. Therefore, the electron beam re-solidified samples revealed the most pronounced hardening.

Role of silicon in the precipitation kinetics of dilute Al-Sc-Er-Zr alloys

2016 ◽  
Vol 677 ◽  
pp. 485-495 ◽  
Author(s):  
Nhon Q. Vo ◽  
David C. Dunand ◽  
David N. Seidman
Keyword(s):  
Precipitation Kinetics ◽  
Kinetics Of ◽  
Zr Alloys

Effect of ECAP Processing on Hardness, Electrical Conductivity, and Precipitation Kinetics of the Cu-0.81Cr-0.07Zr Alloy

2021 ◽  
Author(s):  
Filipe Caldatto Dalan ◽  
Gisele Ferreira de Lima Andreani ◽  
Dilermando Nagle Travessa ◽  
Svetlana Faizova ◽  
Ilshat Albertovich Faizov ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Precipitation Kinetics ◽  
Ecap Processing ◽  
Kinetics Of

The effect of composition and cooling rate on the structure of rapidly solidified (Fe, Ni)3Al–C alloys

1989 ◽  
Vol 4 (1) ◽  
pp. 44-49 ◽  
Author(s):  
S. A. Myers ◽  
C. C. Koch
Keyword(s):  
Cooling Rate ◽  
Base Alloy ◽  
Weight Percent ◽  
Quench Rate ◽  
Transmission Electron ◽  
Metastable Structures ◽  
Metastable Structure ◽  
The Matrix ◽  
Rapidly Solidified ◽  
Kinetics Of

There is controversy in the literature regarding the existence of the metastable γ′ phase with an ordered Ll2 structure in rapidly solidified Fe–Ni–Al–C alloys. In this study, the quench rate–metastable structure dependence was examined in the Fe–20Ni–8Al–2C (weight percent) alloy. The effect of silicon on the kinetics of phase formation was studied by adding two weight percent silicon to a base alloy of Fe–20Ni–8Al–2C. Samples were rapidly solidified in an arc hammer apparatus and examined by transmission electron microscopy. In the Fe–20Ni–8Al–2C alloy, the nonequilibrium γ′ and γ phases were found in foils 65 to 100 μm thick. At higher quench rates, i.e., thinner samples, the matrix was observed to be disordered fcc γ with K-carbide precipitates. Samples containing silicon were found to have a matrix composed of γ′ and γ structures when the foils were thicker than 40 μm. At higher quench rates, the matrix was disordered fcc γ with K-carbide precipitates. The nonequilibrium γ′ and γ structures are present in samples with or without silicon, but are observed at higher cooling rates with the addition of silicon. This sensitivity to cooling rate and composition in resulting metastable structures may explain the differences reported in the literature for these rapidly solidified materials.

A DSC study on the precipitation kinetics of cryorolled Al 6063 alloy

2010 ◽  
Vol 122 (1) ◽  
pp. 188-193 ◽  
Author(s):  
S.K. Panigrahi ◽  
R. Jayaganthan ◽  
V. Pancholi ◽  
Manoj Gupta
Keyword(s):  
Precipitation Kinetics ◽  
Kinetics Of
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