The Detriment of Coherency Strains to the Electrical Conductivity of Naturally-Aged B319 Al Alloy

2020 ◽  
Vol 51 (11) ◽  
pp. 5923-5931
Author(s):  
Eli Vandersluis ◽  
Comondore Ravindran ◽  
Menachem Bamberger
Keyword(s):  
Electrical Conductivity ◽  
Al Alloy ◽  
Coherency Strains

Effect of Li on Mechanical Properties and Electrical Conductivity of the Al–Zn–Cu–Mg Based Alloys

2021 ◽  
Vol 21 (9) ◽  
pp. 4897-4901
Author(s):  
Hyo-Sang Yoo ◽  
Yong-Ho Kim ◽  
Hyeon-Taek Son
Keyword(s):  
Mechanical Properties ◽  
Electrical Conductivity ◽  
Grain Size ◽  
Tensile Strength ◽  
Spherical Particles ◽  
Al Alloy ◽  
High Angle ◽  
Average Grain Size ◽  
Strength Improvement ◽  
Li Content

In this study, changes in the microstructure, mechanical properties, and electrical conductivity of cast and extruded Al–Zn–Cu–Mg based alloys with the addition of Li (0, 0.5 and 1.0 wt.%) were investigated. The Al–Zn–Cu–Mg–xLi alloys were cast and homogenized at 570 °C for 4 hours. The billets were hot extruded into rod that were 12 mm in diameter with a reduction ratio of 38:1 at 550 °C. As the amount of Li added increased from 0 to 1.0 wt.%, the average grain size of the extruded Al alloy increased from 259.2 to 383.0 µm, and the high-angle grain boundaries (HGBs) fraction decreased from 64.0 to 52.1%. As the Li content increased from 0 to 1.0 wt.%, the elongation was not significantly different from 27.8 to 27.4% and the ultimate tensile strength (UTS) was improved from 146.7 to 160.6 MPa. As Li was added, spherical particles bonded to each other, forming an irregular particles. It is thought that these irregular particles contribute to the strength improvement.

scholarly journals Study on the Relationship between High Temperature Mechanical Properties and Precipitates Evolution of 7085 Al Alloy after Long Time Thermal Exposures

Metals ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1483
Author(s):  
Jinxin Zang ◽  
Pan Dai ◽  
Yanqing Yang ◽  
Shuai Liu ◽  
Bin Huang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Electrical Conductivity ◽  
High Temperature ◽  
Tensile Properties ◽  
Volume Fraction ◽  
Al Alloy ◽  
Strengthening Effect ◽  
Nano Scale ◽  
High Temperature Mechanical Properties ◽  
The Relationship

The requirement for 7085 Al alloy as large airframe parts has been increasing due to its low quenching sensitivity and high strength. However, the relationship between high temperature mechanical properties and the evolution of precipitates in hot environments is still unclear. In this work, thermal exposure followed by tensile tests were conducted on the 7085 Al alloy at various temperatures (100 °C, 125 °C, 150 °C and 175 °C). Variations of hardness, electrical conductivity and tensile properties were investigated. The evolution of the nano scale precipitates was also quantitatively characterized by transmission electron microscopy (TEM). The results show that the hardness and electrical conductivity of the alloy are more sensitive to the temperature than to the time. The strength decreases continuously with the increase of temperature due to the transformation from η′ to η phase during the process. Furthermore, the main η phase in the alloy transformed from V3 and V4 to V1 and V2 variants when the temperature was 125 °C. Additionally, with increasing the temperature, the average precipitate radius increased, meanwhile the volume fraction and number density of the precipitates decreased. The strengthening effect of nano scale precipitates on tensile properties of the alloy was calculated and analyzed.

Effect of friction stir processing on electrical conductivity and corrosion resistance of AA6063-T6 Al alloy

2008 ◽  
Vol 222 (7) ◽  
pp. 1117-1123 ◽  
Author(s):  
T S Mahmoud
Keyword(s):  
Electrical Conductivity ◽  
Corrosion Resistance ◽  
Friction Stir Processing ◽  
Rotational Speed ◽  
Mechanical Characteristics ◽  
Base Material ◽  
Al Alloy ◽  
Friction Stir ◽  
Electrical Conductivities ◽  
Hcl Solution

The aim of this paper is to study the effect of friction stir processing (FSP) on electrical conductivity and corrosion resistance of AA6063-T6 Al alloy. Also, the microstructural and mechanical characteristics were examined. Different samples were structured by employing a constant feed rate (ν) of 120 mm/min and different rotating speeds (ω) of 250, 315, 400, 500, 630, and 800 r/min. The results showed that FSP significantly refines the microstructure of the AA6063-T6 Al alloy. Increasing the rotational speed increases the grain size in the centres of stirred zones (SZ). The FSP significantly increases the electrical conductivity of the alloy. The highest electrical conductivities were observed at the centres of the SZ for the alloys processed with varying rotational speeds between 315 and 500 r/min. Increasing the rotational speed above this range tends to reduce the electrical conductivity, but it is still higher than the base material. In contrast, the corrosion resistance was found to decrease due to FSP of the AA6063-T6 aluminium alloy. It has been found that, increasing the rotational speed decreases the corrosion resistance of the SZ in 1 M HCl solution.

Influence of Rare Earth and Fe Addition on the Microstructure and Mechanical Properties of Al-B Alloy

2021 ◽  
Vol 16 (5) ◽  
pp. 806-811
Author(s):  
Hyo-Sang Yoo ◽  
Yong-Ho Kim ◽  
Hyeon-Taek Son
Keyword(s):  
Mechanical Properties ◽  
Electrical Conductivity ◽  
Rare Earth ◽  
Intermetallic Compounds ◽  
Al Alloy ◽  
High Angle ◽  
Average Grain Size ◽  
Metallic Compounds ◽  
Annealed Copper ◽  
Fe Addition

In this study, changes in the microstructure, mechanical properties, and electrical conductivity of as-cast and as-extruded Al–B based alloys with the addition of Fe and rare earth (RE) were investigated. The melted aluminum alloy was maintained at 750 °C and then poured into a mould at 200 °C. Aluminum alloys were hot-extruded into a rod that was 12 mm in thickness with a reduction ratio of 39:1. The addition of Fe and RE resulted in the formation of Al11RE3 and Al3Fe intermetallic compounds and the area fraction of these inter-metallic compounds increased with increasing Fe and RE contents. As the amount of Fe and RE increased, the average grain size of the extruded Al alloy decreased to 798.6, 196.1, and 21.9 µm, and the high-angle grain boundaries fraction increased to 24.8, 27.9, and 60.7%. In the case of cast materials, low electrical conductivity was shown by porosity and fine casting defects. As the Fe and RE contents increased, the electrical conductivity of the extruded Al–B alloy decreased to 62.3, 59.6 and 55.0% International Annealed Copper Standard. As the Fe and RE content increased the ultimate tensile strength improved from 90.8 to 112.9 MPa which was attributed to the grain refinement and formation of Al11RE3 and Al3Fe intermetallic compounds by the addition of Fe and RE.

Correlation of Strength with Hardness and Electrical Conductivity for Aluminium Alloy 7010

2006 ◽  
Vol 519-521 ◽  
pp. 853-858 ◽  
Author(s):  
Manuel A. Salazar-Guapuriche ◽  
Y.Y. Zhao ◽  
Adam Pitman ◽  
Andrew Greene
Keyword(s):  
Mechanical Properties ◽  
Electrical Conductivity ◽  
Tensile Strength ◽  
Aluminium Alloy ◽  
Precipitation Hardening ◽  
Age Hardening ◽  
Al Alloy ◽  
Wide Range ◽  
Proof Strength ◽  
The Relationship

The tensile strength, proof strength, hardness and electrical conductivity of Al alloy 7010 under different temper and ageing conditions were investigated with the aim to correlate strength with hardness and electrical conductivity so that the strength of the alloy can be determined nondestructively. Following the solutionising treatment, continuous age hardening was performed on a series of test coupons, taken from a large plate, to produce a wide range of precipitation hardening conditions, which gave rise to progressive variations of strength, hardness and conductivity. The relationship between strength and hardness was found to be reasonably linear, whereas the relationship between hardness and strength with electrical conductivity was non-linear. The ageing conditions and therefore the mechanical properties of the components can be predicted more accurately by the simultaneous combination of hardness and conductivity values.

Enhanced mechanical properties and electrical conductivity in ultrafine-grained Al alloy processed via ECAP-PC

2013 ◽  
Vol 48 (13) ◽  
pp. 4501-4509 ◽  
Author(s):  
M. Yu. Murashkin ◽  
I. Sabirov ◽  
V. U. Kazykhanov ◽  
E. V. Bobruk ◽  
A. A. Dubravina ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Electrical Conductivity ◽  
Al Alloy ◽  
Ultrafine Grained

Effect of porosity and reinforcement content on the electrical conductivity of spray formed 2014-Al alloy + SiCpcomposites

2004 ◽  
Vol 39 (22) ◽  
pp. 6821-6825 ◽  
Author(s):  
V. C. Srivastava ◽  
A. Schneider ◽  
V. Uhlenwinkel ◽  
K. Bauckhage
Keyword(s):  
Electrical Conductivity ◽  
Al Alloy ◽  
Reinforcement Content ◽  
2014 Al Alloy

Strength and electrical conductivity of Cu-Al alloy sheets by cryogenic high-speed rolling

2021 ◽  
Vol 799 ◽  
pp. 139815
Author(s):  
Sangmin Lee ◽  
Yong-Deok Im ◽  
Ryo Matsumoto ◽  
Hiroshi Utsunomiya
Keyword(s):  
Electrical Conductivity ◽  
High Speed ◽  
Al Alloy

Effects of Al-Doping on the Thermoelectric Properties of ZnO:Al Thin Films

2014 ◽  
Vol 1033-1034 ◽  
pp. 110-113 ◽  
Author(s):  
Jing Ting Luo ◽  
Mao Dong Zhu ◽  
Di Gu ◽  
Liu Yang Wang ◽  
Qing Yun Lin ◽  
...  
Keyword(s):  
Thin Film ◽  
Electrical Conductivity ◽  
Thermoelectric Properties ◽  
Room Temperature ◽  
Zno Films ◽  
Al Alloy ◽  
Al Doping ◽  
Glass Substrates ◽  
Maximum Value ◽  
Alloy Target

Zn1-xAlxO (AZO,x=0, 1.2, 2.1, 2.8 and 3.8 at.%) films were deposited on glass substrates at room-temperature by magnetron sputtering using Zn-Al alloy target. The influence of Al-doping on the thermoelectric properties of AZO films was systematically investigated. It was found that the electrical conductivity at room temperature increased from ~450 S/m (undoped ZnO) to 5.7×104S/m (Zn0.979Al0.021O). The Seebeck coefficient of Zn0.972Al0.028O and Zn0.979Al0.021O film increased stably with the increase of temperature from room temperature up to 300 °C. The power factor of Zn0.972Al0.028O thin film increased significantly with increasing of temperature and reached a maximum value of 17.9×10-5Wm-1K-2at 300 °C, which was about three times larger than that of undoped ZnO films.

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