The rapid age strengthening induced by Ag additions in 7075 aluminum alloy

Xu, Xiaofeng; Zhao, Yuguang; Wang, Xudong; Zhang, Yangyang; Ning, Yuheng

doi:10.1016/j.msea.2015.09.044

Cited by 24 publications

(3 citation statements)

References 16 publications

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“…The results of the chemical composition show a significant amount of silver of about 1.74% present in the 7075 alloy powder. According to Xu et al [32], the addition of silver to 7075 alloy hinders the growth of recrystallized grains during T6 heat treatment thereby raising the strength and ductility of the alloy. They reported increasing peak values of micro hardness as the silver additions increase to 0.4% after aging at 120 degrees Celsius for 12 h. The relative density decrease as the scan speed was changed from 200 mm s −1 to 500 mm s −1 in the remaining four hatch distances of 0.1 mm to 0.3 mm.…”

Section: Powder Characterization Resultsmentioning

confidence: 99%

“…It has been reported that heat treatment of 7075 alloys with silver additions reduces the process of precipitation and achieves high mechanical properties within a short time [42]. Xu et al [32] observed in a study of cast 7075 alloys after T6 treatment, that the micro-hardness decreases after hardening beyond the above period of hours for which the peak micro-hardness values were obtained and it was attributed to over aging. The highest hardness obtained in their study was with the sample having the highest percentage of silver which was attained within the shortest aging period of 12 h. The decrease in hardness also confirmed the study reported by Sistiaga et al [40] after applying a modified T6 (solution treatment at 470°C for 2 h, water quenched, and aged at 150°C for 6 h) heat treatment on Al7075 aluminum [43] in agreement with Sistiaga et al [40] reported that age-hardened cast 7075 alloy yields higher hardness due to MgZn 2 phases that are coherent and finely dispersed.…”

Section: Effects Of Heat Treatments On the Hardness Of 7075 Alloys Bymentioning

confidence: 99%

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Experimental investigation of the effect of processing parameters on densification, microstructure and hardness of selective laser melted 7075 aluminium alloy

Mbakaan²,

Barki

2020

Mater. Res. Express

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The 7075 aluminum alloy of the 7xxx series largely used for structures in modern aircraft has been successfully fabricated using selective laser melting (SLM) technology. The morphology of the initial 7075 aluminum alloy powders was characterized by a Zeiss Evo 50 Scanning electron microscope (SEM). Energy Dispersive x-ray (EDX) spectrometer attached to SEM was used as a tool to obtain the chemical composition of the powders. Processing parameters including scan speed, hatch distance and constant laser power (100 and 150 W) effect on densification, microstructure and hardness were investigated. The initial powder particles were found to be elongated and non-spherical and composed of Al, Zn, Mg, Cu, and Ag without Si. The result of the influence of processing parameters on properties of the as-built samples by SLM technology indicates that higher densification of parts can be gained using higher laser power and lower laser scan speed and hatch distance due to significant reduction in the number of pores. Two major types of pores including metallurgical and keyhole pores have been identified with the keyhole pores dominating the samples processed by low laser power of 100 W. The keyhole pores increase in size at a high scan speed and hatch distances. By using higher laser power of 150 W, the keyhole pores reduced significantly while metallurgical pores appear. The result of the hardness test conducted on the samples shows that high values of hardness can be achieved with low scan speed.

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Section: Powder Characterization Resultsmentioning

confidence: 99%

Section: Effects Of Heat Treatments On the Hardness Of 7075 Alloys Bymentioning

confidence: 99%

Experimental investigation of the effect of processing parameters on densification, microstructure and hardness of selective laser melted 7075 aluminium alloy

Mbakaan²,

Barki

2020

Mater. Res. Express

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show abstract

“…Precipitation hardening refers to the presence of precipitates, which can hamper dislocation motion by interfering with their movement. In general, a higher number of small precipitates boost the strength of the material [29]. On the basis of Fig.…”

Section: Strengthening Mechanisms At Varying Testing Temperaturementioning

confidence: 93%

Mechanical and corrosion resistance properties of AA7075-T6 sub-zero formed sheets

Bertolini

Simonetto

Pezzato

et al. 2021

Int J Adv Manuf Technol

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The poor formability of 7xxx series aluminium alloys represents the major limit to their actual use for automotive and aerospace applications. In the present study, the forming temperature effect on the mechanical, corrosion and anodization behaviours of the AA7075-T6 alloy is investigated. To this purpose, tensile tests at different temperatures, ranging from −100 to 300°C, were carried out at different rolling directions. A 6.6% increase of the ultimate tensile strength and a 28.6% increase of the uniform elongation were registered for the specimens deformed at the lowest temperature compared to highest ones. Further, the corrosion resistance of specimens deformed at ultimate tensile strength before and after anodization was increased of 85% and 95%, respectively, compared to the specimens deformed at 300°C. It was demonstrated that high deformation temperatures led to the coalescence of particles and precipitates as well as the decrease of dislocation density, which, in turn, decreased the mechanical and corrosion performances. On the contrary, the deformation temperature of −100°C was found to be the ideal one able to shorten the manufacturing process chain and improve material formability and durability during its in-service life.

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Co-Extrusion of Compound-Cast AA7075/6060 Bilayer Billets at Various Temperatures

et al. 2021

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The rapid age strengthening induced by Ag additions in 7075 aluminum alloy

Cited by 24 publications

References 16 publications

Experimental investigation of the effect of processing parameters on densification, microstructure and hardness of selective laser melted 7075 aluminium alloy

Experimental investigation of the effect of processing parameters on densification, microstructure and hardness of selective laser melted 7075 aluminium alloy

Mechanical and corrosion resistance properties of AA7075-T6 sub-zero formed sheets

Co-Extrusion of Compound-Cast AA7075/6060 Bilayer Billets at Various Temperatures

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