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.

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

Effect of RE Addition on Microstructure and Properties of As-Cast Mg-6Zn-Zr Alloy

2013 ◽  
Vol 711 ◽  
pp. 110-114
Author(s):  
Seung Jin Lee ◽  
Joon Sik Park ◽  
Jeong Min Kim ◽  
Ki Tae Kim
Keyword(s):  
Electrical Conductivity ◽  
Grain Size ◽  
Tensile Strength ◽  
Corrosion Resistance ◽  
Room Temperature ◽  
Filling Ability ◽  
High Microhardness ◽  
Cast Microstructure ◽  
Zr Alloy ◽  
Zr Alloys

Typical as-cast microstructure of the MgZnRE-Zr alloys consists primarily of Mg matrix, MgZn and MgRE phases. Although the electrical conductivity was a slightly reduced by Ce-rich RE addition, the conductivity was remained high. Microhardness at room temperature and tensile strength at 200°C were clearly enhanced by the addition. Fluidity as mold filling ability was observed to increase significantly with the RE addition partly due to reduced grain size and solidification range, however the corrosion resistance predicted from polarization curves was little decreased.

Influence of cooling rate on the precipitation kinetics of nanoscale isothermal ω-phase in metastable β-Ti alloy, Ti–5Al–5Mo–5V–3Cr

2020 ◽  
pp. 157822
Author(s):  
Deepak Sharma ◽  
David Parfitt ◽  
Bo Chen ◽  
Bryan Roebuck ◽  
Diego Alba Venero ◽  
...  
Keyword(s):  
Cooling Rate ◽  
Ti Alloy ◽  
Precipitation Kinetics ◽  
Ω Phase ◽  
Kinetics Of

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.

The precipitation kinetics of copper in silicon near room temperature

1968 ◽  
Vol 17 (149) ◽  
pp. 929-941 ◽  
Author(s):  
R. C. Dorward ◽  
J. S. Kirkaldy
Keyword(s):  
Room Temperature ◽  
Precipitation Kinetics ◽  
Kinetics Of

Microstructure and Mechanical Properties of a Mg-Zn-Y-Zr Alloy Processed by Thermo-Mechanical Treatment

2005 ◽  
Vol 488-489 ◽  
pp. 123-126
Author(s):  
Ya Zhang ◽  
Xiao Qing Zeng ◽  
Chen Lu ◽  
Wen Jiang Ding ◽  
Yan Ping Zhu
Keyword(s):  
Mechanical Properties ◽  
Aging Process ◽  
Mechanical Treatment ◽  
Room Temperature ◽  
Aged Alloy ◽  
Strengthening Effect ◽  
Precipitation Behavior ◽  
Microstructure And Mechanical Properties ◽  
Thermo Mechanical Treatment ◽  
Zr Alloy

Mg92Zn6Y1.5Zr0.5 alloy was extruded at 300, 350, 400 ı. Then, the alloy was aged at 180 ı. The microstructure and mechanical properties of the extruded alloy and aged alloy were investigated. The precipitation behavior of aging process was investigated. The increase of yield strength at room temperature and ultimate strength at elevated temperature after the aging process has been ascribed to the strengthening effect of these precipitates.

The Role of Copper in the Precipitation Kinetics of 6000 Series Al Alloys

2006 ◽  
Vol 519-521 ◽  
pp. 169-176 ◽  
Author(s):  
S. Esmaeili ◽  
David J. Lloyd
Keyword(s):  
Isothermal Calorimetry ◽  
Cluster Formation ◽  
Analytical Techniques ◽  
Al Alloys ◽  
Precipitation Kinetics ◽  
Precipitation Behavior ◽  
Transmission Electron ◽  
Precipitate Nucleation ◽  
Kinetics Of

The role of Cu in precipitation behavior of 6000 series aluminum alloys has been investigated by isothermal calorimetry and transmission electron microscopy. The newly developed analytical techniques have been used to evaluate the precipitation kinetics in alloys with or without an initial pre-aging history. It has been found that Cu addition results in increasing the rate of precipitation when artificial aging is applied immediately after solutionizing and quenching. However, Cu has no significant effect on the kinetics of precipitation in alloys with the pre-aging history, while it produces finer microstructures in the pre-aged and then artificially aged alloys. These observations have been explained by the effect of Cu on increasing the rate of precipitate nucleation in 6000 series alloys. It has also been suggested that the effect of Cu on nucleation arises from the role of Cu on the cluster formation during and/or immediately after quenching.

scholarly journals The Influence of Inter-Cooling and Electromagnetic Stirring above Liquidus on the Formation of Primary Al3Zr and Grain Refinement in an Al-0.2%Zr Alloy

Materials ◽  
2018 ◽  
Vol 12 (1) ◽  
pp. 22 ◽  
Author(s):  
Tianyang Guan ◽  
Zhifeng Zhang ◽  
Yuelong Bai ◽  
Min He ◽  
Hansen Zheng ◽  
...  
Keyword(s):  
External Field ◽  
Cooling Rate ◽  
Grain Refinement ◽  
Grain Growth ◽  
Master Alloy ◽  
Electromagnetic Stirring ◽  
Refinement Mechanism ◽  
Insight Into ◽  
Zr Alloy ◽  
Zr Alloys

The nucleation and grain growth that occur during solidification have been extensively examined, but insight into the influence of an external field on the formation of heterogeneous crystal nuclei above the liquidus remains unclear in the peritectic refinement mechanism. In this work, we studied the effect of cooling rate above the liquidus on the formation of primary Al3Zr and grain refinement in Al-0.2%Zr alloys with inter-cooling annular electromagnetic stirring (IC-AEMS). The results show that the size and distribution of primary Al3Zr are greatly improved, and the morphology transformed from large plate/blocky shapes without IC-AEMS to small blocks with IC-AEMS. Meanwhile, above the liquidus, the addition of an Al-Zr master alloy to pure Al alone did little to enhance the refinement, but after IC-AEMS, the grains were refined dramatically. The refinement result seems to be explained by two hypotheses of pre-nucleation and explosive nucleation.

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
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