scholarly journals Effect of artificial aging on the mechanical performance of (Al-Cu) 2024 and (Al-Cu-Li) 2198 aluminum alloys

2016 ◽  
Vol 2 ◽  
pp. 3782-3783 ◽  
Author(s):  
Nikolaos D. Alexopoulos ◽  
Aggeliki Proiou ◽  
Theano Examilioti ◽  
Nikolai Kashaev ◽  
Stefan Riekehr ◽  
...  
Keyword(s):  
Aluminum Alloys ◽  
Artificial Aging ◽  
Mechanical Performance

scholarly journals Accelerated discovery of high-strength aluminum alloys by machine learning

2020 ◽  
Vol 1 (1) ◽  
Author(s):  
Jiaheng Li ◽  
Yingbo Zhang ◽  
Xinyu Cao ◽  
Qi Zeng ◽  
Ye Zhuang ◽  
...  
Keyword(s):  
Machine Learning ◽  
Aluminum Alloys ◽  
Mechanical Performance ◽  
High Strength ◽  
Cost Effective ◽  
Alloy System ◽  
Processing Route ◽  
Specific Strength ◽  
Cu Alloy ◽  
High Strength Aluminum Alloys

Abstract Aluminum alloys are attractive for a number of applications due to their high specific strength, and developing new compositions is a major goal in the structural materials community. Here, we investigate the Al-Zn-Mg-Cu alloy system (7xxx series) by machine learning-based composition and process optimization. The discovered optimized alloy is compositionally lean with a high ultimate tensile strength of 952 MPa and 6.3% elongation following a cost-effective processing route. We find that the Al8Cu4Y phase in wrought 7xxx-T6 alloys exists in the form of a nanoscale network structure along sub-grain boundaries besides the common irregular-shaped particles. Our study demonstrates the feasibility of using machine learning to search for 7xxx alloys with good mechanical performance.

The Effect of Heat Treatments and Nickel Additive on The Microstructure and Hardness of 7075 Aluminum Alloy

2019 ◽  
Vol 7 (2) ◽  
pp. 34-41
Author(s):  
Mahmoud Alasad ◽  
Mohamad Yahya Nefawy
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Aluminum Alloys ◽  
Artificial Aging ◽  
Heat Treatments ◽  
7075 Aluminum Alloy ◽  
Nickel Additive

The aluminum alloys of the 7xxx series consist of Al with Zn mainly, Mg and Cu. 7xxx aluminum alloys has high mechanical properties making it distinct from other aluminum alloys. In this paper, we examine the effect of adding Nickel and heat treatments on the microstructure and hardness of the 7075 aluminum alloy. Were we added different percentages of nickel [0.1, 0.5, 1] wt% to 7075 Aluminum alloy, and applied various heat treatments (artificial aging T6 and Retrogression and re-aging RRA) on the 7075 alloys that Containing nickel. By applying RRA treatment, we obtained better results than the results obtained by applying T6 treatment, and we obtained the high values of hardness and a smoother microstructure for the studied alloys by the addition of (0.5 wt%) nickel to alloy 7075.

Mechanical Performance Evaluation of Cast Magnesium Alloys for Automotive and Aeronautical Applications

2006 ◽  
Vol 129 (3) ◽  
pp. 422-430 ◽  
Author(s):  
Sp. G. Pantelakis ◽  
N. D. Alexopoulos ◽  
A. N. Chamos
Keyword(s):  
Aluminum Alloys ◽  
Magnesium Alloys ◽  
Quality Index ◽  
Mechanical Performance ◽  
Cast Aluminum ◽  
Treatment Conditions ◽  
Cast Aluminum Alloys ◽  
Structural Applications ◽  
Cast Magnesium Alloys ◽  
Cast Magnesium

The potential of cast magnesium alloys for being used as structural materials in lightweight applications is assessed. The ability of the alloys for mechanical performance is evaluated and compared against the ability of widely used structural aircraft cast aluminum alloys. The specific quality index QDS, devised for evaluating both cast and wrought aluminum alloys, will be exploited to evaluate the ability of a number of cast magnesium alloys for mechanical performance. The exploited quality index QDS involves the material’s yield strength Rp to account for strength, the strain energy density W to account for both tensile ductility and toughness, and the material’s density ρ. The effects of differences in chemical composition and heat treatment conditions on the mechanical performance of cast magnesium alloys have been assessed. The use of the quality index QDS has been proved to appreciably facilitate the evaluation of the mechanical performance of cast magnesium alloys and also the comparison between alloys of different base materials. The results quantify the gap to be closed such as to involve cast magnesium alloys in aircraft structural applications.

scholarly journals Effects of natural aging and reversion treatments on artificial aging behavior of 6000 series aluminum alloys

2009 ◽  
Vol 59 (3) ◽  
pp. 128-133 ◽  
Author(s):  
Takahiko Nakamura ◽  
Kazuto Morita ◽  
Masanori Nagai ◽  
Shin-ya Komatsu
Keyword(s):  
Aluminum Alloys ◽  
Artificial Aging ◽  
Natural Aging ◽  
Aging Behavior

scholarly journals Influence of Preheating Temperature on Changes in Properties in the HAZ during Multipass MIG Welding of Alloy AW 6061 and Possibilities of Their Restoration

Metals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1902
Author(s):  
Iva Novakova ◽  
Jaromir Moravec ◽  
Jan Novak ◽  
Pavel Solfronk
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Aluminum Alloys ◽  
Heat Input ◽  
Artificial Aging ◽  
Fusion Welding ◽  
High Thermal Conductivity ◽  
Mig Welding ◽  
Preheating Temperature ◽  
Very High

Fusion welding of heat-treatable aluminum alloys is generally accompanied by a significant decrease in mechanical properties in the HAZ caused by the dissolution of the hardening phase. The intensity of this decrease in mechanical properties can be reduced by limiting the heat input value. However, this approach is in direct conflict with the principles for welding aluminum and its alloys. Due to the very high thermal conductivity of aluminum alloys, it is necessary to use preheating for thicknesses larger than 5 mm to eliminate non-penetration and cold joints. This paper aims to show the influence of multiple temperature cycles, performed at different preheating temperatures, on changes in the microstructure and mechanical properties. At the same time, the extent to which the original properties of the material can be restored by natural and artificial aging at 160, 175 and 190 °C is also investigated.

scholarly journals A Facile Way to Prolong Service Life of Double Base Propellant

Materials ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2236 ◽  
Author(s):  
Shixiong Sun ◽  
Song Ma ◽  
Benbo Zhao ◽  
Guangpu Zhang ◽  
Yunjun Luo
Keyword(s):  
Mechanical Properties ◽  
Service Life ◽  
Storage Time ◽  
Artificial Aging ◽  
Mechanical Performance ◽  
Diffusion Characteristics ◽  
Actual Service ◽  
Before And After ◽  
Double Base ◽  
And Diffusion

The safe storage time for double base propellant (DBP or DB propellant) with stabilizers could usually be calculated to be greater than 40 years. However, the actual service life is far below that, which is largely caused by the decline of propellant mechanical performance. In this work polytetrafluoroethylene (PTFE) was introduced into the double base propellant formula as an additive. The tensile properties of this propellant before and after artificial aging were determined. The evaporation and diffusion characteristics of nitroglycerin (NG) in propellant were evaluated by thermogravimetry analysis (TGA). The results showed that mechanical properties of propellant were improved due to PTFE, especially for elongation at −40 °C, which was greatly increased by 115%. Moreover, the results of TGA showed that NG migration was reduced due to PTFE, which delayed the decline of propellant mechanical performance during aging. The reduction in elongation at −40 °C caused by aging was decreased by 68.5% for PTFE modified DBP. Enhanced mechanical properties and reduced NG migration could potentially prolong propellant service life.

scholarly journals The Effect of Nanostructures in Aluminum Alloys Processed Using Additive Manufacturing on Microstructural Evolution and Mechanical Performance Behavior

Crystals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 524
Author(s):  
Rachel Boillat ◽  
Sriram Praneeth Isanaka ◽  
Frank Liou
Keyword(s):  
Additive Manufacturing ◽  
Aluminum Alloys ◽  
Manufacturing Industry ◽  
Mechanical Performance ◽  
Weight Ratio ◽  
High Strength ◽  
The Status ◽  
End Use ◽  
Am Processes ◽  
Performance Behavior

This paper reviews the status of nanoparticle technology as it relates to the additive manufacturing (AM) of aluminum-based alloys. A broad overview of common AM processes is given. Additive manufacturing is a promising field for the advancement of manufacturing due to its ability to yield near-net-shaped components that require minimal post-processing prior to end-use. AM also allows for the fabrication of prototypes as well as economical small batch production. Aluminum alloys processed via AM would be very beneficial to the manufacturing industry due to their high strength to weight ratio; however, many of the conventional alloy compositions have been shown to be incompatible with AM processing methods. As a result, many investigations have looked to methods to improve the processability of these alloys. This paper explores the use of nanostructures to enhance the processability of aluminum alloys. It is concluded that the addition of nanostructures is a promising route for modification of existing alloys and may be beneficial to other powder-based processes.

scholarly journals The Effect of pre-aging treatments on Tensile Properties and Hardness for Aluminum Alloys

2019 ◽  
Vol 26 (4) ◽  
pp. 98-104
Author(s):  
Mahmoud AlAssaad ◽  
Mohamad Yehea Al nefawy
Keyword(s):  
Tensile Strength ◽  
Aluminum Alloy ◽  
Aluminum Alloys ◽  
Tensile Properties ◽  
Artificial Aging ◽  
6061 Aluminum Alloy ◽  
One Stage ◽  
Different Temperatures ◽  
One Step ◽  
Hardness Values

Abstract— In this research the effect of artificial aging on tensile strength and hardness for Al-Mg-Si (6061 Aluminum alloy) was study, samples from 6061 alloy were submitted to one step artificial aging for different temperatures, while others samples were submitted to two steps artificial aging (where there is a first stage as pre-aging) in descending and ascending modes. The results showed that the highest tensile strength values were reached 214.7 [N/mm2] and hardness were reached 220 [HB] for 6061 Aluminum alloy when the samples were treated by one-step ageing in 190 [°C] for 3 [hour]. While tensile strength and hardness values of samples treated by two-step ageing were slightly higher than these values when the samples was aged at one stage. Where the maximum values of tensile strength was 215 [N/mm2] and for hardness was 227 [HB] when the 6061 alloy treated with two-step ageing the first one in 175 [°C] for 2 [hour] and the second one in 205 [°C] for 1 [hour].

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