Microstructural and Mechanical Study of Aluminium Alloys Submitted to Distinct Soaking Times During Solution Heat Treatment

Monteiro, Valmir Martins; Diniz, Saulo Brinco; Meirelles, Bruna Godoi; Silva, Luis Celso da; Paula, Andersan dos Santos

doi:10.4322/tmm.2014.047

Cited by 10 publications

(8 citation statements)

References 6 publications

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“…At the maximum operating temperature 530 °C, the value of microhardness slightly increased from at S7-T1 (77.642 HV) to 81.744 HV at S9-T1. Below 530 °C, there was a tendency towards increasing hardness with increasing the holding time, however the trend was opposite for temperatures above and this was agreed by several researchers [ 28 , 29 , 39 ]. Furthermore, when comparing the minimum–maximum parameter (S1-T1 and S9-T1) the value of microhardness increased from 69.761 HV to 81.744 HV.…”

Section: Resultssupporting

confidence: 81%

“…The process requires high temperature, however it should not be higher than liquid temperature as well as be given sufficient time for phases containing copper and/or magnesium to dissolve completely so that a nearly homogenous solid solution is achieved. The temperature and time must be well controlled, because either insufficiency or excessiveness may cause coarsening and decreasing precipitate [ 28 ]. Solubility increases with increase in temperature, so conducting in lower temperatures will give worse properties [ 29 ].…”

Section: Resultsmentioning

confidence: 99%

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Hot Press as a Sustainable Direct Recycling Technique of Aluminium: Mechanical Properties and Surface Integrity

2017

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Meltless recycling technique has been utilized to overcome the lack of primary resources, focusing on reducing the usage of energy and materials. Hot press was proposed as a novel direct recycling technique which results in astoundingly low energy usage in contrast with conventional recycling. The aim of this study is to prove the technical feasibility of this approach by characterizing the recycled samples. For this purpose, AA6061 aluminium chips were recycled by utilizing hot press process under various operating temperature (Ts = 430, 480, and 530 °C) and holding times (ts = 60, 90, and 120 min). The maximum mechanical properties of recycled chip are Ultimate tensile strength (UTS) = 266.78 MPa, Elongation to failure (ETF) = 16.129%, while, for surface integrity of the chips, the calculated microhardness is 81.744 HV, exhibited at Ts = 530 °C and ts = 120 min. It is comparable to theoretical AA6061 T4-temper where maximum UTS and microhardness is increased up to 9.27% and 20.48%, respectively. As the desired mechanical properties of forgings can only be obtained by means of a final heat treatment, T5-temper, aging after forging process was employed. Heat treated recycled billet AA6061 (T5-temper) are considered comparable with as-received AA6061 T6, where the value of microhardness (98.649 HV) at 175 °C and 120 min of aging condition was revealed to be greater than 3.18%. Although it is quite early to put a base mainly on the observations in experimental settings, the potential for significant improvement offered by the direct recycling methods for production aluminium scrap can be clearly demonstrated. This overtures perspectives for industrial development of solid state recycling processes as environmentally benign alternatives of current melting based practices.

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Section: Resultssupporting

confidence: 81%

Section: Resultsmentioning

confidence: 99%

Hot Press as a Sustainable Direct Recycling Technique of Aluminium: Mechanical Properties and Surface Integrity

2017

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“…Aluminum alloys can also be heat treated to precondition for aging and improve phase structure without precipitation 23) .…”

Section: Introductionmentioning

confidence: 99%

Investigation of Temperature History, Porosity and Fracture Mode on AA1100 Using the Controlled Intermittent Wire Feeder Method

Baskoro¹,

Amat²,

Putra³

et al. 2020

Evergreen

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In this study, the effect of variation of intermittent wire feeding method on thermal histories during the welding process, the physical appearance, mechanical properties, and fracture mode was investigated. The configuration parameter of wire feeding was determined by the properties of the so-called length ratio (RL). It was influenced by welding speed, wire feeding speed, feeding time, and delaying time. Bigger value of length ratio tends to have a smaller bead width with a higher cap. Also, a larger ratio tends to have bigger tensile strength and the fracture location close to the weld bead.

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“…To reveal the grain boundary resulting from dynamic recovery or recrystallization, the specimens underwent etching using Baker's reagent. The grain boundary analysis was performed using the intercept methods at basic magnification at 100x on ASTM-E112 [10,11].…”

Section: • Mechanical Characterizationmentioning

confidence: 99%

Life cycle assessment of direct recycling hot press forging of aluminium AA7075 metal matrix composite

Khaireez,

Yusuf,

Ghaleb

et al. 2024

Mater. Res. Express

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The primary objective of this research is to investigate the process of direct recycling of AA7075 aluminium alloy, which is extensively utilised in the aerospace and flight sectors due to its exceptional strength and lightweight characteristics. This study aims to examine the effect of hot press forging (HPF) parameters on the mechanical characteristics and surface integrity of a metal matrix composite (MMC) constructed of AA7075 alloy with 1% Al2O3. Furthermore, the utilisation of an integrated life cycle assessment (LCA) approach is implemented to assess the environmental impacts and economic expenses associated with the recycling of aluminium via high-pressure forming (HPF) for both the metal matrix composite (MMC) and AA7075 alloy. Response surface methodology (RSM) is applied to ascertain the optimal parameters for high-performance filtration (HPF). The findings suggest that employing a forging temperature of 532.34◦C and a holding time of 60 minutes produces favourable results. When comparing the characteristics of the MMC and recycled aluminium, it can be observed that they both demonstrate similar essential process attributes. The utilisation of High-Performance Fibres (HPF) in conjunction with the Multi-Material Composite (MMC) has the potential to yield a reduction of up to 24.97% in Global Warming Potential (GWP). This research demonstrates the efficacy of HPF as a viable approach for environmentally conscious and economically efficient recycling of AA7075 aluminium scrap, thereby improving product performance and promoting sustainability.

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Microstructural and Mechanical Study of Aluminium Alloys Submitted to Distinct Soaking Times During Solution Heat Treatment

Cited by 10 publications

References 6 publications

Hot Press as a Sustainable Direct Recycling Technique of Aluminium: Mechanical Properties and Surface Integrity

Hot Press as a Sustainable Direct Recycling Technique of Aluminium: Mechanical Properties and Surface Integrity

Investigation of Temperature History, Porosity and Fracture Mode on AA1100 Using the Controlled Intermittent Wire Feeder Method

Life cycle assessment of direct recycling hot press forging of aluminium AA7075 metal matrix composite

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