Effects of an electric field applied during the solution heat treatment of the Al–Mg–Si–Cu alloy AA 6111 on the subsequent natural aging kinetics and tensile properties

Quench trials were performed on AA6005A and AA6016 alloys to assess the sensitivity of their tensile properties as well as bendability to quench after solution heat treatment. Results indicate that the tensile properties in T4 and in the paint-baked state (2% pre-strain + 185 °C/20 min) are hardly affected by quench rate as long as the exit temperature (Texit) is sufficiently low. The bendability however, appears to be more sensitive to quench rate, and the sensitivity depends on the chemical composition of the alloy. The alloy with a higher excess Si content exhibits higher sensitivity to natural aging which in turn affects the bending and hemming performance of the material. Therefore, it is not only the quench rate which affects the bendability but also the temperature of the material at the end of quench. DSC analysis revealed how cluster formation proceeding the solution heat-treatment (SH) and quench provokes the quench sensitivity.

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On the Development of an Al4.8 wt% Cu Alloy Obtained from Recycled Aluminum Cans Designed for Thixoforming Process

Advances in Materials Science and Engineering ◽

10.1155/2016/6762109 ◽

2016 ◽

Vol 2016 ◽

pp. 1-8

Author(s):

Ronan Miller Vieira ◽

Gianni Ferreira Alves Moreira ◽

André Itman Filho ◽

Estéfano Aparecido Vieira

Keyword(s):

Solution Heat Treatment ◽

Natural Aging ◽

Tensile Tests ◽

Permanent Mold ◽

Semisolid State ◽

Globular Microstructure ◽

Cu Alloy ◽

Heat Treated ◽

Aluminum Cans ◽

Melting And Solidification

This work has focused on the development of a new aluminum alloy containing 4.8 wt% of Cu alloy obtained from recycled aluminium cans designed for thixoforming process. After the step of melting and solidification of the alloy in a metallic permanent mold, samples were solution heat treated at 525°C for times ranging from 2 h to 48 h, quenched in water and followed by natural aging. Results have shown the evolution of hardness so from them solubilization solution heat treatment was chosen for 24 h. The best condition for aging was 190°C during 3 h. With this data pieces were thixoforged at 580°C and 615°C corresponding, respectively, to solid fraction (fs) of 0.8 and 0.6. The optimized T6 temper was applied and tensile tests were performed. The mechanical properties obtained are compatible with those obtained for consolidated alloys processed in semisolid state (SS) and after T6 temper hardness increases from 95 HB to 122 HB and the best results were a tensile strength of 324 MPa ± 10 MPa, yield strength of 257 MPa ± 18 MPa, and an elongation of 7.1% ± 1%. For alloys designed for thixoforming process, these results are in accordance with what was expected whereas globular microstructure, high ductility, and good performance under cyclic conditions are desirable.

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Optimizing the tensile properties of Al–Si–Cu–Mg 319-type alloys: Role of solution heat treatment

Materials & Design (1980-2015) ◽

10.1016/j.matdes.2014.01.060 ◽

2014 ◽

Vol 58 ◽

pp. 426-438 ◽

Cited By ~ 49

Author(s):

Y. Han ◽

A.M. Samuel ◽

H.W. Doty ◽

S. Valtierra ◽

F.H. Samuel

Keyword(s):

Heat Treatment ◽

Tensile Properties ◽

Solution Heat Treatment

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Effect of Non-Conventional Aging Treatments on the Tensile Properties of Non-Hipped Castings of Aluminum Alloy 354

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.875-877.1397 ◽

2014 ◽

Vol 875-877 ◽

pp. 1397-1405 ◽

Cited By ~ 2

Author(s):

G. Dinesh Babu ◽

M. Nageswara Rao

Keyword(s):

Mechanical Properties ◽

Heat Treatment ◽

Aluminum Alloy ◽

Tensile Properties ◽

Artificial Aging ◽

Natural Aging ◽

Single Step ◽

Cast Aluminum Alloy ◽

Cast Aluminum ◽

Automobile Components

Cast aluminum alloy 354 is used extensively for production of critical automobile components, owing to its excellent castability and attractive combination of mechanical properties after heat-treatment. With the advent of higher performance engines, there has been a steady demand to further improve the mechanical behavior of the castings made of the alloy, among others, through improvements in processing. The present study explores the possibility of improving tensile properties of the alloy by adopting certain non-conventional aging treatments. The non-conventional treatments include aging cycles similar to T6I4 and T6I6 referred to in the published literature, artificial aging in two steps instead of in single step and artificial aging preceded by various natural aging times. The results show that none of these non-conventional treatments leads to improvement of all tensile properties compared to the standard T61 treatment. Significant hardening takes place in the alloy due to natural aging. Changing the time of natural aging preceding artificial aging was found to have little effect on tensile properties.

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The Simultaneous Effect of Extrusion Ratio and Solution Heat Treatment on the Microstructure and Tensile Properties of Extruded Al-15%Mg2Si- 1.0%Gd Composite

Materials Science Forum ◽

10.4028/www.scientific.net/msf.1010.166 ◽

2020 ◽

Vol 1010 ◽

pp. 166-171

Author(s):

Hamidreza Ghandvar ◽

Wan Famin Faiz ◽

Tuty Asma Abu Bakar ◽

Mohd Hasbullah Idris

Keyword(s):

Heat Treatment ◽

Ductile Fracture ◽

Tensile Properties ◽

Solution Heat Treatment ◽

Extrusion Ratio ◽

Treatment Processes ◽

Heat Treated ◽

Size And Morphology ◽

Surface Examination ◽

Strength And Ductility

The effect of extrusion ratios and solution heat treatment on microstructure and tensile properties of extruded Al-15%Mg2Si-1.0%Gd composite was investigated. The as-cast composite was hot extruded using three different dies and solution heat treated. After conducting heat treatment on extruded samples, microstructure alteration was examined using scanning electron microscope (SEM). Furthermore, mechanical properties of the composites were studied with tensile test. The results demonstrated that extruded and heat treated composite possesses higher strength and ductility compared to as-extruded composites. It was also found that the extrusion and heat treatment processes altered the morphology of primary Mg2Si particles as well as reduction in their size especially when the extrusion ratio increases. Fracture surface examination revealed a transition from ductile fracture in as-extruded samples to more ductile fracture in extruded and heat treated ones. This can be attributed to the change in size and morphology of primary Mg2Si particles as well as fragmentation of Gd intermetallic compounds.

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Effect of Sr-P Interaction on the Microstructure and Tensile Properties of A413.0 Type Alloys

Advances in Materials Science and Engineering ◽

10.1155/2016/7691535 ◽

2016 ◽

Vol 2016 ◽

pp. 1-11 ◽

Cited By ~ 3

Author(s):

A. M. Samuel ◽

H. W. Doty ◽

S. Valtierra ◽

F. H. Samuel

Keyword(s):

Heat Treatment ◽

Tensile Properties ◽

Solution Heat Treatment ◽

Eutectic Silicon ◽

Low Magnesium ◽

The Third ◽

Wide Range ◽

Eutectic Si ◽

Second Peak ◽

Silicon Particles

The present study was performed on low magnesium A413.0 type alloys. The results show that strontium (Sr) is mainly concentrated in the silicon particles. Overmodification occurs when Sr precipitates in the form of Al2SrSi2, which takes place over a wide range of temperatures. The first peak occurs following the precipitation ofα-Al, the second peak is merged with the precipitation of eutectic silicon (Si), and the third peak is a posteutectic reaction. Introduction of phosphorus (P) to Sr-modified alloys leads to the formation of (Al,P,Sr)2O5compound, which reduces the modification effectiveness of Sr. Therefore, in the presence of P, the amount of added Sr should exceed 200 ppm. For the same levels of P, the tensile parameters of well modified alloys (233 ppm Sr) are relatively higher than those partially modified with Sr (about 60 ppm Sr) containing the same amount of P. During solution heat treatment, coarsening of the eutectic Si particles occurs by the growth of some particles at the expense of the dissolution of the smaller ones, as well as by the collision of nearby particles.

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Effect of Heat Treatment on the Mechanical Properties of Wrought Al-Zn-Mg-Cu Alloy Cast by Rapid Solidification

Materials Science Forum ◽

10.4028/www.scientific.net/msf.765.496 ◽

2013 ◽

Vol 765 ◽

pp. 496-500 ◽

Cited By ~ 3

Author(s):

Dawid Kapinos ◽

Marcin Szymanek ◽

Bogusław Augustyn ◽

Maciej Gawlik

Keyword(s):

Mechanical Properties ◽

Heat Treatment ◽

Rapid Solidification ◽

Solution Heat Treatment ◽

Grain Structure ◽

Ultrafine Grain ◽

Cu Alloy ◽

Optimum Heat ◽

Ultrafine Grain Structure ◽

Alloy Cast

The article presents the change in mechanical properties of AlZn9Mg2.5Cu1.8 alloy resulting from the process of solution heat treatment and aging. The heat treatment was performed on a unique UMSA (Universal Metallurgical Simulator and Analyzer) device. The aim of the study was to determine optimum heat treatment parameters for the tested alloy of ultrafine grain structure obtained by Rapid Solidification (RS). To achieve this purpose, heat treatment to the T4 and T6 condition was carried out. The solution heat treatment was carried out at a constant temperature of 460 °C for 2 hours, while the time - temperature parameters of the aging process varied. The treatment undertaken resulted in improved mechanical properties.

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