Effects on the as-Cast Structure of 7075 Aluminum Alloy by Treating with Electrical Pulse Inoculation

2012 ◽  
Vol 535-537 ◽  
pp. 954-958
Author(s):  
Zhong Yuan Sun ◽  
Yu Liang ◽  
Ling Feng Yu ◽  
Zhi Yi Shi
Keyword(s):  
Aluminum Alloy ◽  
Electric Pulse ◽  
Solidification Structure ◽  
Al Alloy ◽  
7075 Aluminum Alloy ◽  
Cast Structure ◽  
Electrical Impulse ◽  
Electrical Pulses ◽  
Electric Impulse ◽  
Spherical Grains

This paper investigates the influence of electrical pulses inoculation and Al-5Ti-B on the as-cast structure of 7075 aluminum alloy. The experimental results indicate that the number of the secondary branch crystal of the solidification structure is effectively controlled, and the feature of as-cast structure achieve the equiaxial and spherical grains after the liquid 7075 Al-alloy was treated by electrical impulse inoculation and Al-5Ti-B. Compared with these samples treating without electrical impulse inoculation, the segregation of Cu and Fe is restrained to a certain extent too. Some primary refinement mechanisms analyze those effects on the solidification structure by treating with electric pulse and Al-5Ti-B; this experiment may provide a theoretical reference for the application of electric impulse in 7075 aluminum alloy.

Effect of Electromagnetic Field on Horizontal Direct Chill Casting of 7075 Aluminum Alloy

2010 ◽  
Vol 654-656 ◽  
pp. 982-985 ◽  
Author(s):  
Qing Feng Zhu ◽  
Zhi Hao Zhao ◽  
Xiang Jie Wang ◽  
Jian Zhong Cui
Keyword(s):  
Electromagnetic Field ◽  
Aluminum Alloy ◽  
Electromagnetic Fields ◽  
Molten Pool ◽  
Casting Process ◽  
Direct Chill ◽  
7075 Aluminum Alloy ◽  
Solidification Behavior ◽  
Cast Structure ◽  
Thermal Distribution

The influence of different electromagnetic fields on the horizontal direct chill (HDC) casting of aluminum alloy is studied. 7075 aluminum alloy with 100-mm in diameter is produced by HDC casting process; single electromagnetic field located before or around the mold and an out-phase electromagnetic field (OPEMF) are applied in the HDC casting process. The effect of different electromagnetic fields on the HDC casting solidification behavior and as-cast structure is investigated. The electromagnetic field can effectively make uniform thermal distribution in the molten pool and refine the as-cast structure. The OPEMF is more efficient than the single electromagnetic field in improving the as-cast structure of HDC cast ingots.

Characterizations of Electrospark Deposition TA2 Alloy Coating on 7075 Aluminum Alloy Surface

2013 ◽  
Vol 821-822 ◽  
pp. 873-876
Author(s):  
Ming Wei Wang ◽  
Wen Xin ◽  
Xiu Jun Zhao ◽  
Qin Yi Ma ◽  
Shu Li
Keyword(s):  
Aluminum Alloy ◽  
Electrode Materials ◽  
Hardness Test ◽  
Alloy Coating ◽  
7075 Aluminum Alloy ◽  
Micro Hardness ◽  
X Ray Diffraction ◽  
Electrospark Deposition ◽  
Gradient Distribution ◽  
Electrical Pulses

Electro-spark deposition (ESD) is a microwelding process that utilizes short duration of electrical pulses to deposit electrode materials to a metallic substrate. In this paper, taking TA2 bar as electrode, a deposition layer of thickness up to 40μm was built up to on 7075 aluminum alloy substrate by means of ESD. The deposition layer is metallurgical bonded to the substrate. The microstructure, phase composition, and micro-hardness of TA2 coating were investigated using scanning electron microscopy (SEM), X-ray diffraction (XRD) and micro-hardness test. The microstructure of the coating was mainly composed of TiN phase, Al3Ti phase, AlN phase and Al phase. Its micro-hardness reached 295 HV0.05, about 2 times as high as that of the substrate. The hardness at the cross-section of the entire deposition layer showed a gradient distribution.

scholarly journals Enhanced Formability and Accelerated Precipitation Behavior of 7075 Al Alloy Extruded Rod by High Temperature Aging

Metals ◽  
2018 ◽  
Vol 8 (8) ◽  
pp. 648 ◽  
Author(s):  
Ming-Hsiang Ku ◽  
Fei-Yi Hung ◽  
Truan-Sheng Lui ◽  
Jyun-Jhih Lai
Keyword(s):  
Aluminum Alloy ◽  
High Temperature ◽  
Artificial Aging ◽  
Treatment Time ◽  
Total Elongation ◽  
Al Alloy ◽  
7075 Aluminum Alloy ◽  
High Temperature Aging ◽  
Full Annealing ◽  
Temperature Aging

This study was conducted for high temperature aging (HTA) to simultaneously reduce current treatment time and increase the tensile ductility of 7075 aluminum alloy. Various high temperatures and different durations for artificial aging were compared. We investigated the microstructure and the tensile properties of 7075 aluminum alloy extruded rod after various HTAs, and compared them with the outcomes of full annealing (O). The total elongation (TE) of the specimen after solution heat treatment (490 °C, 1 h) and artificial aging (280 °C, 12 h) was about 25%. For full annealing, it is known as 21%. The reason for this was the formation of the η phase in the matrix, which had fewer large particles (Al-Cu phase). The hardening of HTA specimens is higher than that of O, indicating necking resistance during homogeneous plastic deformation. Thereby, HTA treatment increases the formability of 7075 aluminum alloy.

Effect of ultrasonic melt treatment on the tribological behavior of 7075 aluminum alloy

2020 ◽  
Vol 62 (12) ◽  
pp. 1243-1250
Author(s):  
Fahri Vatansever ◽  
Alpay Tamer Erturk ◽  
Erol Feyzullahoglu
Keyword(s):  
Aluminum Alloy ◽  
Tribological Behavior ◽  
7075 Aluminum Alloy ◽  
Melt Treatment ◽  
Ultrasonic Melt Treatment

Gold Nanoparticle-Enhanced Laser-Induced Breakdown Spectroscopy and Three-Dimensional Contour Imaging of an Aluminum Alloy

2020 ◽  
pp. 000370282097304
Author(s):  
Amal A. Khedr ◽  
Mahmoud A. Sliem ◽  
Mohamed Abdel-Harith
Keyword(s):  
Gold Nanoparticles ◽  
Aluminum Alloy ◽  
Three Dimensional ◽  
Plasma Temperature ◽  
Spectral Lines ◽  
Laser Induced Breakdown Spectroscopy ◽  
Al Alloy ◽  
Boltzmann Plot ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown

In the present work, nanoparticle-enhanced laser-induced breakdown spectroscopy was used to analyze an aluminum alloy. Although LIBS has numerous advantages, it suffers from low sensitivity and low detection limits compared to other spectrochemical analytical methods. However, using gold nanoparticles helps to overcome such drawbacks and enhances the LIBS sensitivity in analyzing aluminum alloy in the current work. Aluminum was the major element in the analyzed samples (99.9%), while magnesium (Mg) was the minor element (0.1%). The spread of gold nanoparticles onto the Al alloy and using a laser with different pulse energies were exploited to enhance the Al alloy spectral lines. The results showed that Au NPs successfully improved the alloy spectral lines intensity by eight times, which could be useful for detecting many trace elements in higher matrix alloys. Under the assumption of local thermodynamic equilibrium, the Boltzmann plot was used to calculate the plasma temperature. Besides, the electron density was calculated using Mg and H lines at Mg(I) at 285.2 nm and Hα(I) at 656.2 nm, respectively. Three-dimensional contour mapping and color fill images contributed to understanding the behavior of the involved effects.

scholarly journals Effect of Nucleation Supercooling on the Solidification Structure of Aluminum Alloy Ingots

1982 ◽  
Vol 23 (7) ◽  
pp. 412-421
Author(s):  
Tamotsu Sato ◽  
Kazuyuki Kohda ◽  
Katsuaki Kusano ◽  
Katsuya Ikawa
Keyword(s):  
Aluminum Alloy ◽  
Solidification Structure

Study of the SCC Behavior of 7075 Aluminum Alloy After One-Step Aging at 163 °C

2012 ◽  
Vol 22 (1) ◽  
pp. 210-214 ◽  
Author(s):  
G. Silva ◽  
B. Rivolta ◽  
R. Gerosa ◽  
U. Derudi
Keyword(s):  
Aluminum Alloy ◽  
7075 Aluminum Alloy ◽  
One Step
Sign in / Sign up

Export Citation Format

Share Document