Effect of deformation at elevated temperature before age-hardening on the mechanical properties of 2024 commercial aluminium alloy

This paper presents the main achievements of a research project aimed at investigating the applicability of the hot stamping technology to non heat treatable aluminium alloys of the 5052 H32 and heat treatable aluminium alloys of the 6016 T4P after six months natural aging. The formability and mechanical properties of 5052 H32 and 6016 T4P aluminum alloy sheets after six months natural aging under different temperature conditions were studied, the processing characteristics and potential of the two aluminium alloy at room and elevated temperature were investigated. The results indicated that the 6016 aluminum alloy sheet exhibit better mechanical properties at room temperature. 5052 H32 aluminum alloy sheet shows better formability at elevated temperature, and it has higher potential to increase formability by raising the temperature.

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Effects of strain rate on mechanical properties in tension of a commercial aluminium alloy used in armour applications

Procedia Structural Integrity ◽

10.1016/j.prostr.2016.06.126 ◽

2016 ◽

Vol 2 ◽

pp. 986-993 ◽

Cited By ~ 8

Author(s):

Ezio Cadoni ◽

Matteo Dotta ◽

Daniele Forni ◽

Hanspeter Kaufmann

Keyword(s):

Mechanical Properties ◽

Strain Rate ◽

Aluminium Alloy ◽

Commercial Aluminium

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Effect of FSP on Strength and Fracture Toughness of Aluminium Alloy 7000

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.877.20 ◽

2018 ◽

Vol 877 ◽

pp. 20-25

Author(s):

P.K. Mandal

Keyword(s):

Mechanical Properties ◽

Fracture Toughness ◽

Aluminium Alloy ◽

Axial Force ◽

Weight Ratio ◽

High Strength ◽

Hardness Measurement ◽

Traverse Speed ◽

Age Hardening ◽

Friction Stir

The cast Al-Zn-Mg 7000 alloy has become one of the most potential structural materials in many engineering fields such as aircraft body, automotive casting due to their high strength to weight ratio, strong age hardening ability, competitive weight savings, attractive mechanical properties and improvement of thermal properties. The cast aluminium alloy has been modified of surface layer through a solid-state technique is called friction stir process (FSP). But basic principle has been followed by friction stir welding (FSW). This process can be used to locally refine microstructures and eliminate casting defects in selected locations, where mechanical properties improvements can enhance component performance and service life. However, some specified process parameters have adopted during experimental works. Those parameters are tool rotation speed (720 rpm), plate traverse speed (80 mm/min), axial force (15 kN), and tool design (i.e., pin height 3.5 mm and pin diameter 3.0 mm), respectively. The main mechanism behind this process likely to axial force and frictional force acting between the tool shoulder and workpiece results in intense heat generation and plastically soften the process material. The specified ratio of rotational speed (720 rpm) to traverse speed (80 mm/min) is considered 9 as low heat input during FSP and its entails low Zn vaporization problem results as higher fracture toughness of aluminium alloy. It is well known that the stirred zone (SZ) consists of refine equiaxed grains produced due to dynamic recrystallization. FSP has been proven to innovatively enhancing of various properties such as formability, hardness and fracture toughness (32.60 MPa√m). The hardness and fracture toughness of double passes AC+FSP aluminium alloy had been investigated by performing Vicker’s hardness measurement and fracture toughness (KIC)(ASTM E-399 standard) tests. Detailed observations with optical microscopy, Vicker’s hardness measurement, SEM, TEM, and DTA analysis have conducted to analyse microstructure and fracture surfaces of double passes FSP aluminium alloy.

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Effect of magnesium on some mechanical properties of 1200 Aluminium alloy

Ife Journal of Science ◽

10.4314/ijs.v23i2.15 ◽

2021 ◽

Vol 23 (2) ◽

pp. 147-152

Author(s):

M. D. Shittu ◽

A. E. Olaniyi ◽

A. A. Daniyan ◽

D. A Isadare ◽

K. M. Oluwasegun ◽

...

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Impact Strength ◽

Aluminium Alloy ◽

Magnesium Content ◽

Mechanical Tests ◽

Dispersion Hardening ◽

Dispersion Strengthening ◽

Hardening Material ◽

Commercial Aluminium

This paper investigated the effect of magnesium as a dispersion strengthening material on some mechanical properties of 1200-Aluminium (Al-Fe-Si) alloy, a typical commercial aluminium alloy used in the production of household utensils. 1200-Aluminium (Al-Fe-Si) alloy containing varying percentages of the dispersion hardening material (i.e. Magnesium) were produced and mechanical tests namely; hardness, tensile strength and impact strength were carried out. Also, the microstructures of the cast materials were studied. The results showed that increase in magnesium content, as dispersion hardening material improved the hardness, tensile strength and caused a slight decrease in impact strength of the 1200-Aluminium alloy. It is inferred from this work that using magnesium as a dispersion hardening material brings about corresponding improvement in some mechanical properties of 1200-Aluminium (Al-Fe-Si) alloy. Keywords: Magnesium, Aluminium alloy, dispersion strengthened, reinforced alloy, crystallographic formation Depth, Geothermal Energy

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

Materials Science Forum ◽

10.4028/www.scientific.net/msf.519-521.853 ◽

2006 ◽

Vol 519-521 ◽

pp. 853-858 ◽

Cited By ~ 34

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.

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Microstructure Evolution and Mechanical Properties of an Al-Si-Cu-Mg-Ni Aluminium Alloy after Thermal Exposure

Materials Science Forum ◽

10.4028/www.scientific.net/msf.765.486 ◽

2013 ◽

Vol 765 ◽

pp. 486-490 ◽

Cited By ~ 1

Author(s):

Feng Xia ◽

Jian Ping Li ◽

Yong Chun Guo ◽

Zhong Yang

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Elevated Temperature ◽

Ultimate Tensile Strength ◽

Aluminium Alloy ◽

Exposure Time ◽

Room Temperature ◽

Brinell Hardness ◽

Eutectic Silicon ◽

Thermal Exposure

The microstructures and mechanical properties of an Al-Si-Cu-Mg-Ni aluminium alloy have been investigated after thermal exposure at 350 °C for time intervals up to 1000 h. Experimental results showed that, with increasing the thermal exposure time, room temperature ultimate tensile strength, elevated temperature ultimate tensile strength, and Brinell hardness firstly decreased remarkably (up to 100 h) and then decreased slightly to a certain constant value (100-1000 h). Before thermal exposure, room temperature ultimate tensile strength, elevated temperature ultimate tensile strength, elevated temperature elongation percentage, and Brinell hardness of the alloys are 203.5 MPa, 48.7 MPa, 9.2%, and 82.3, respectively. With increasing the thermal exposure time, eutectic silicon grows up steadily, and the amount of Q phase with a flower shape increases. Transmission electron microscopy analysis showed that the formation of stable θ precipitates was found in the microstructure.

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THE INFLUENCE OF CHEMICAL COMPOSITION AND HEAT TREATMENT ON THE MECHANICAL PROPERTIES AND WORKABILITY OF THE ALUMINIUM ALLOY EN AW 5454

Materiali in tehnologije ◽

10.17222/mit.2021.155 ◽

2021 ◽

Vol 55 (5) ◽

Author(s):

Alenka Šalej Lah ◽

Maja Vončina ◽

Irena Paulin ◽

Jožef Medved ◽

Peter Fajfar ◽

...

Keyword(s):

Mechanical Properties ◽

Heat Treatment ◽

Chemical Composition ◽

Aluminium Alloy ◽

Base Alloy ◽

Deformation Behaviour ◽

Compression Tests ◽

Cast State ◽

Cast Slab ◽

Commercial Aluminium

The influence of chemical composition and heat treatment on the mechanical properties and formability of the selected commercial aluminium alloy EN AW 5454 was investigated. The main properties of alloy 5454 from the AA 5xxx series are very good corrosion resistant and has good formability. From the cast slab a 50 mm thick slice was taken in the width cross section in the slab centre. One half of the slice was homogenised for 10 hours at a temperature of 530 °C. The cast and homogenised samples were investigated using light and scanning electron microscopy. For the study of the influence of the heat treatment, samples in the as-cast state were annealed in the laboratory furnace at a temperature of 530 °C for 4, 6, 8, 10 and 12 hours. To study the influence of chemical composition, four different samples were prepared: the first without additions, the second with an addition of 1 wt% Mn, the third with 3 wt% Mg and the fourth with an addition of both elements, Mn and Mg. The XRF analyses confirmed the desired chemical composition of all four produced alloys. Half of each alloy’s sample was homogenised at the same temperature and time as the base alloy in the as-cast state. The hot deformation behaviour of the different alloys was investigated using cylindrical hot compression tests performed on a Gleeble 1500D thermo-mechanical simulator. By comparing flow curves a high influence of the thermo-mechanical parameters on the alloy formability can be seen. The alloy has good workability and with the addition of Mn and Mg, the stress values are higher than those of the base alloy.

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Effects of Rotary Swaging Parameters and Artificial Ageing on Mechanical Properties and Microstructure of 2024 Precipitation-Hardenable Aluminium Alloy

Materials ◽

10.3390/ma13010143 ◽

2019 ◽

Vol 13 (1) ◽

pp. 143

Author(s):

Jan Nacházel ◽

Jan Palán ◽

Jaromír Dlouhý ◽

Peter Sláma ◽

Zbyšek Nový

Keyword(s):

Mechanical Properties ◽

Aluminium Alloy ◽

Electron Backscatter Diffraction ◽

Synergistic Effects ◽

Age Hardening ◽

Great Promise ◽

Artificial Ageing ◽

Scanning Calorimetry ◽

Rotary Swaging ◽

Heat Treated Condition

This work concerns mechanical properties in relation to microstructural changes in hardenable EN AW-2024 aluminium alloy in wrought and heat treated condition. The treated material benefits from synergistic effects of hardening mechanisms. Grain boundary strengthening and work hardening were activated in this material by rotary swaging. Rotary swaging is a method which shows great promise for industrial use. Precipitation hardening was achieved thanks to the material’s age hardening ability. First, the material was artificially-aged in a furnace at 140–180 °C. Second, natural ageing was used. Mechanical properties of the as-treated material were tested and microstructural processes were explored using electron microscopy and differential scanning calorimetry. The treatment route which delivered the best results was as follows: solution annealing 500 °C/1 h + water cooling + rotary swaging + artificial ageing 160 °C/21 h. This led to a yield strength close to 640 MPa, and ultimate strength above 660 MPa, and elongation of 8%. Electron backscatter diffraction observation revealed that in this condition, the ratio of Low-angle to High-angle grain boundaries is 80:20. The microstructure contains both T-phase in the interior of grains, whose particles are normally oval-shaped, and S-phase, which is present in two shapes: small oval particles or coherent needles aligned to <100> direction.

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