Effects of an external electric field applied during the solution heat treatment of the Al–Mg–Si–Cu alloy AA6111

2004 ◽  
Vol 95 (5) ◽  
pp. 352-355 ◽  
Author(s):  
Hans Conrad ◽  
Kang Jung
Keyword(s):  
Heat Treatment ◽  
Electric Field ◽  
External Electric Field ◽  
Solution Heat Treatment ◽  
Cu Alloy

Effect of Heat Treatment on the Mechanical Properties of Wrought Al-Zn-Mg-Cu Alloy Cast by Rapid Solidification

2013 ◽  
Vol 765 ◽  
pp. 496-500 ◽  
Author(s):  
Dawid Kapinos ◽  
Marcin Szymanek ◽  
Bogusław Augustyn ◽  
Maciej Gawlik
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Rapid Solidification ◽  
Solution Heat Treatment ◽  
Grain Structure ◽  
Ultrafine Grain ◽  
Cu Alloy ◽  
Optimum Heat ◽  
Ultrafine Grain Structure ◽  
Alloy Cast

The article presents the change in mechanical properties of AlZn9Mg2.5Cu1.8 alloy resulting from the process of solution heat treatment and aging. The heat treatment was performed on a unique UMSA (Universal Metallurgical Simulator and Analyzer) device. The aim of the study was to determine optimum heat treatment parameters for the tested alloy of ultrafine grain structure obtained by Rapid Solidification (RS). To achieve this purpose, heat treatment to the T4 and T6 condition was carried out. The solution heat treatment was carried out at a constant temperature of 460 °C for 2 hours, while the time - temperature parameters of the aging process varied. The treatment undertaken resulted in improved mechanical properties.

scholarly journals In-Situ Analysis Of Incipient Melting And Characterization Of A Novel Al-Cu Alloy for Cylinder Head Applications

2021 ◽  
Author(s):  
Bernoulli Andilab
Keyword(s):  
Heat Treatment ◽  
Solution Heat Treatment ◽  
Laser Scanning ◽  
Microstructural Analysis ◽  
Secondary Phases ◽  
Incipient Melting ◽  
Scanning Calorimetry ◽  
Slow Cooling ◽  
Cu Alloy

Incipient melting of secondary phases during solution heat treatment of Al alloys is detrimental to their mechanical properties. In this research, incipient melting was analyzed in-situ using a high temperature Laser Scanning Confocal Microscope (LSCM) in a novel Al-Cu alloy. Thermal analysis and microstructural analysis were carried out on the alloy cast at fast and slow cooling rates to examine the resulting solidification and microstructural characteristics. The results showed that incipient melting was accompanied by a clustering liquid droplets followed by a complete melting of Al2Cu which occurred at approximately 548 ℃. Additionally, the use of LSCM enabled an understanding of the underlying mechanisms behind incipient melting. It was also found that incipient melting led to microstructure that consisted of a higher presence of ultra-fine eutectic clusters, needle-like Al2Cu and porosity along the grain boundaries. Lastly, the solution heat treatment temperature was optimized for the Al-Cu alloy using the data from LSCM, Differential Scanning Calorimetry and solution heat treatment experiments.

Consequences of Inappropriate Temperatures of the Solution Heat Treatment in Al-Si-Cu Cast Alloys

2020 ◽  
Vol 405 ◽  
pp. 357-364
Author(s):  
Lenka Kuchariková ◽  
Eva Tillová ◽  
Ivana Švecová
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Solution Heat Treatment ◽  
Solution Treatment ◽  
Age Hardening ◽  
Solution Temperature ◽  
Optimum Conditions ◽  
Cu Alloy ◽  
Cast Alloys ◽  
Casting Industry

Al-Si-Cu alloy systems have a great importance in the casting industry due to their excellent castability, good mechanical properties and wear resistance. Addition of alloying elements, such as Mg and Cu, makes these alloys heat treatable. Improving of their mechanical properties allows their using in new, more demanding applications (e.g. engines, cylinder heads etc.). The most applied heat treatment for this alloy is a T6 (age hardening). Such a heat treatment is required for precipitation of the Al2Cu hardening dispersed phase that increases the mechanical properties of Al alloys. Therefore, the consequences of different solution heat treatment temperatures 505, 515 and 525 °C for AlSi9Cu3 and 515, 525 and 545 °C for AlSi12Cu1Fe cast alloys, with holding times 2, 4, 8, 16 and 32 hours, were investigated in this study. The effect of solution treatment was evaluated based on changes in microstructure (optical microscopy) and mechanical properties (hardness, impact energy and ultimate tensile strength). The study confirms the strengthening of the experimental alloys caused by application of optimum conditions of T6 and melting of the Cu-rich phases with application of inappropriate solution temperature, as well as distortion and changes of the testing bars.

Microstructures and Mechanical Properties of a Squeeze-Casted Al-Zn-Mg-Cu Alloy after Heat Treatment

2014 ◽  
Vol 788 ◽  
pp. 187-192 ◽  
Author(s):  
Lei Lu ◽  
Da Tong Zhang ◽  
Yuan Yuan Li
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Solution Heat Treatment ◽  
Squeeze Casting ◽  
Solute Diffusion ◽  
X Ray Diffraction ◽  
Cu Alloy ◽  
Aging Precipitation ◽  
Microstructures And Mechanical Properties ◽  
Kinetics Of

The effects of heat treatment on the microstructures and mechanical properties of a squeeze-casted Al-6.8%Zn-2.7%Mg-2.0%Cu alloy were studied by optical microscopy (OM), scanning electron microscopy (SEM) and X-ray diffraction (XRD). It is found that squeeze casting can refine the microstructure of the alloy markedly accelerates the diffusion process of solute atoms during solution heat treatment. After solution heat treatment at 470°C for 10h and artificial aging at 130°C for 24h, the tensile strength and the elongation of the squeeze-casted alloy reach 590MPa and 5.0%, respectively, which are almost equal to those of the wrought alloy, and are significantly higher than those of the gravity-casted alloy (435MPa and 1.3%). Based on the experimental results, the mechanism of microstructural evolution and the effect of squeeze casting on the kinetics of solute diffusion and aging precipitation of the squeeze-casted Al-Zn-Mg-Cu alloy were discussed.

Investigation of Grain Boundaries in an Al-Mg-Si-Cu Alloy

2014 ◽  
Vol 794-796 ◽  
pp. 951-956 ◽  
Author(s):  
Jon Holmestad ◽  
Martin Ervik ◽  
Calin D. Marioara ◽  
John Charles Walmsley
Keyword(s):  
Electron Microscopy ◽  
Heat Treatment ◽  
Transmission Electron Microscopy ◽  
Grain Boundaries ◽  
Solution Heat Treatment ◽  
High Angle ◽  
Corrosion Properties ◽  
X Ray ◽  
Cu Alloy ◽  
Transmission Electron

The grain boundaries of a fibrous Al-Mg-Si-Cu alloy have been investigated with Transmission Electron Microscopy. The compositions have been mapped by Energy Dispersive X-ray Spectroscopy. The alloy has been aged for 12 hours at 155°C after solution heat treatment and is in a slightly underaged condition. The precipitates nucleated on the high angle grain boundaries are coarse, while the precipitates on the low angle grain boundaries are smaller and more numerous. The precipitates on both types of grain boundaries has been identified as Q'-type. Copper is segregated to both the low and high angle grain boundaries. The effect of this segregation will be discussed with regards to the corrosion properties of the alloy.

scholarly journals Dielectric losses under heat treatment of dispersed media

2021 ◽  
Vol 24 (6) ◽  
pp. 1223-1231
Author(s):  
M. Yu. Buzunova
Keyword(s):  
Heat Treatment ◽  
Dielectric Loss ◽  
Electric Field ◽  
External Electric Field ◽  
Dielectric Losses ◽  
Loss Angle ◽  
Field Frequency ◽  
Dielectric Characteristics ◽  
Dielectric Loss Angle ◽  
Electric Field Frequency

The purpose of the paper is to study the dependence of dielectric losses of mechanically activated grain crops on example of wheat under heat treatment on temperature and external electric field frequency as well as to examine the effect of particle size of fine grain samples on grain electrophysical characteristics and dielectric losses. Experimental samples of dispersed systems with particle sizes in the range from 50 to 1000 μm are prepared by the method of mechanical activation. The temperature dependence of the dielectric loss angle tangent is measured using the dielectric method over a wide frequency range. The dependence of the dielectric loss angle tangent tgδ of mechanically activated wheat samples with the different degrees of particle dispersion in a wide temperature range from 20°C to 250°C with a heating rate of 0.7 deg/min is studied. It is found out that the external electric field frequency varies in the range from 25 Hz to 106 Hz. Electric capacitance and conductivity are measured using an E7-20 immitance meter and a specially designed measuring cell. Dielectric characteristics are calculated. Experimental data are presented in the form of graphs and diagrams. We have determined the correlation of the tangent of the dielectric loss angle tgδ with the frequency of the external electric field and temperature, which is most characteristic for fine samples. The most finely dispersed samples with a particle size of less than 50 microns are shown to have high electrical activity. Increase in the dielectric permittivity and the tangent of the dielectric loss angle is most noticeable at the frequencies below 100 Hz. The study of dielectric characteristics allows to choose an effective energy-saving drying mode of the crop under study.

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