A systematic study of the effect of interrupted ageing conditions on the strength and toughness development of AA6061

The Al-5.5Zn-2.5Mg (wt pct) ternary alloy was prepared using a vacuum melting furnace and a casting furnace. Five samples were directionally solidified upwards at a constant temperature gradient (G = 5.5 K/mm) under different growth rates (V = 8.3-165 lm/s) in a Bridgman-type directional solidification furnace. The primary dendrite arm spacing, k 1 , secondary dendrite arm spacing, k 2 , and microhardness, HV, of the samples were measured. The effects of V on k 1 , k 2 and HV properties of the Al-Zn-Mg alloy were studied by microstructure analysis and mechanical characterization. Microstructure characterization of the alloys was carried out using optical microscopy, scanning electron microscopy, wavelength-dispersive X-ray fluorescence spectrometry, and energy dispersive X-ray spectroscopy. From the experimental results, it is found that the k 1 , k 2 values decrease, but HV values increase with the increase in V, and HV values decrease with the increase in k 1 and k 2 . Dependencies of dendritic spacing and microhardness on the growth rate were determined using linear regression analysis. The growth rate, microstructure, and Hall-Petch-type relationships obtained in this work have been compared with the results of previous studies.

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“…), and heating and cooling rates of the sample affect the microhardness. [75][76][77][78][79][80][81] …”

Section: The Effect Of Dendritic Spacing and Growth Rate On Microhmentioning

confidence: 99%

Effect of Growth Rate on the Microstructure and Microhardness in a Directionally Solidified Al-Zn-Mg Alloy

Acer

Çadırlı

Erol

et al. 2016

Metall Mater Trans A

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“…The decrease in the hardness is associated with an increase in the inter-particle spacing among precipitates, which makes the dislocation bowing much easier. 12,13 Moreover, the coarsening of the silicon phase results in a reduction of the hardness values.…”

Section: Effects Of the Artificial-aging Temperature And Time On The mentioning

confidence: 99%

Effects of the artificial-aging temperature and time on the mechanical properties and springback behavior of AA6061

Polat¹,

Avsar²,

Öztürk³

2015

Mater. Tehnol.

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In this study, the effects of the artificial-aging temperature and time on the mechanical properties and springback behavior of AA6061 are investigated. The results reveal that the yield strength, the tensile strength and the elongations decreased with the increasing artificial-aging temperature, but increased with the increasing artificial-aging time up to the peak age. The springback of the alloy increased significantly with the increasing artificial-aging time at the artificial-aging temperature ranging from 160°C to 180°C and decreased with the artificial-aging time at 200°C. The springback angle in the as-received condition is lower than in all the aged conditions. Keywords: aluminum alloy, AA6061, artificial aging, mechanical properties, springback V tej {tudiji so bili preiskovani vplivi temperature in~asa umetnega staranja na mehanske lastnosti in vzmetnost AA6061. Rezultati so pokazali zmanj{anje meje te~enja, natezne trdnosti in raztezka pri nara{~anju temperature umetnega staranja ter pove~evanje teh vrednosti do maksimuma pri podalj{anju~asa staranja. Vzmetnost zlitine ob~utno nara{~a z nara{~anjem~asa umetnega staranja v obmo~ju temperatur od 160°C do 180°C in se zmanj{a s~asom umetnega staranja pri 200°C. Kot vzmetnosti v dobavljenem stanju je manj{i kot pri vseh staranih razmerah. Klju~ne besede: aluminijeva zlitina, AA6061, umetno staranje, mehanske lastnosti, vzmetnost

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“…Other methods of corrosion control include inhibitors addition [32][33][34]. Heat treatment (PH) (including DTAT) [31,[35][36][37][38][39][40]. Corrosion resistance of Al-Si-Mg alloy is much better than the aluminium-copper alloys [41].…”

Section: Introductionmentioning

confidence: 99%

Degradation Behavior of High Chromium Sodium-Modified A356.0-Type Al-Si-Mg Alloy in Simulated Seawater Environment

Abdulwahab

Madugu²,

Yaro³

et al. 2011

JMMCE

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The effect of multiple-step thermal ageing treatment (MSTAT) on the corrosion characteristics of A356.0-type Al-Si-Mg alloy in simulated seawater has been studied. The MSTAT treatment also consists of Double Thermal Ageing (DTAT-T7), Single Thermal Ageing (STAT-T6), Step-Quenching and Ageing (SQA). The corrosion of the thermal treated samples was characterized by electrochemical Potentiodynamics polarization techniques consisting of linear polarization and chronopotentiometric method using the fit Tafel plot. Generally, from the linear polarization, the corrosion rate decreases at all temperatures with the ageing time. The corrosion behavior of the DTAT and SQA Al-Si-Mg alloy in the simulated seawater showed better resistance than the STAT Al-Si-Mg alloy. Samples in the SQA-STAT have improved corrosion resistance than the SQA-DTAT one. The chronopotentiometric corrosion study of some selected samples indicates a decrease in the corrosion resistance with open circuit potential exposure time. Consequently, the form of corrosion in the studied Al-Si-Mg alloy are slightly uniform and predominantly pitting corrosion as obtained from the SEM study. The pits diameter were found to range from 30-50µm.

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A systematic study of the effect of interrupted ageing conditions on the strength and toughness development of AA6061

Cited by 45 publications

References 32 publications

Effect of Growth Rate on the Microstructure and Microhardness in a Directionally Solidified Al-Zn-Mg Alloy

Effect of Growth Rate on the Microstructure and Microhardness in a Directionally Solidified Al-Zn-Mg Alloy

Effects of the artificial-aging temperature and time on the mechanical properties and springback behavior of AA6061

Degradation Behavior of High Chromium Sodium-Modified A356.0-Type Al-Si-Mg Alloy in Simulated Seawater Environment

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