Enhanced Strengthening in Ultrafine‐Grained Al–Mg–Si Alloys Produced via ECAP with Parallel Channels

Bobruk, Elena V.; Kazykhanov, Vil U.; Murashkin, M. Yu.; Valiev, Ruslan Z.

doi:10.1002/adem.201500119

Cited by 10 publications

(19 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These precipitates point to the fact that the UFG structure formation during ECAP-C was accompanied by solid solution decomposition due to the dynamic aging (DA). It has also been previously observed in various Al-Mg-Si alloys during SPD both at elevated [19][20][21][22][23][24][41][42][43][44][45] and room temperature [23,24,46].…”

Section: Microstructural Features Of the Alloy Processed Via Ecap-csupporting

confidence: 58%

“…The size of the precipitates increases considerably near GBs (Figure 3c). The same pattern of spherical β′-precipitates distribution can be observed in the UFG Al-Mg-Si alloys processed via ECAP-PС or conventional ECAP at 100 °C [22,41,42], whereas β-precipitates were observed in the Al-Mg-Si alloy processed by HPT at 130 °C [23]. These precipitates point to the fact that the UFG structure formation during ECAP-C was accompanied by solid solution decomposition due to the dynamic aging (DA).…”

Section: Microstructural Features Of the Alloy Processed Via Ecap-csupporting

confidence: 56%

“…TEM studies revealed spherical disperse particles varying from 3 nm to 20 nm in size formed as a result of ECAP-C processing ( Figure 3c). Their morphology same as in the previous research [19,22,41,42] on the Al-Mg-Si alloys subjected to SPD under similar temperature conditions indicates that the particles found in the Al 6101 alloy can be regarded as metastable β-phase precipitates with hexagonal lattice with a Mg/Si ratio of 1.8 [13]. Analysis of SAED patterns ( Figure 3b) shows that a part of the spots corresponding to the Al matrix, there are also spots related to the β′-precipitates, as well as β-precipitates with a Mg/Si ratio of 2.…”

Section: Microstructural Features Of the Alloy Processed Via Ecap-cmentioning

confidence: 85%

“…These results are consistent with the phase composition changes observed in the wire rods after ECAP-C by TEM (Figure 3с). This points to a notable decrease in the concentration of Mg and Si in the Al matrix [19,22,42].…”

Section: Microstructural Features Of the Alloy Processed Via Ecap-cmentioning

confidence: 99%

“…There has also been noted that AA can lead to both strength and ductility increases in UFG alloys [22,42,44,49], or only to mechanical strength enhancement with an admissible ductility decrease [41]. Following these findings a part of the ECAP-C processed wire rod was subjected to AA at 170 °C and 190 °C -the temperatures that are typically used in traditional heat treatment procedures of the commercial rods/wire of 6101 alloy [2,[6][7][8]50].…”

Section: Properties and Microstructure Of The Ufg Alloy Processed Viamentioning

confidence: 99%

See 4 more Smart Citations

Enhanced Mechanical Properties and Electrical Conductivity in Ultrafine-Grained Al 6101 Alloy Processed via ECAP-Conform

Murashkin

Medvedev

Kazykhanov

et al. 2015

Metals

View full text Add to dashboard Cite

This paper studies the effect of equal channel angular pressing-Conform (ECAP-C) and further artificial aging (AA) on microstructure, mechanical, and electrical properties of Al 6101 alloy. As is shown, ECAP-C at 130 °C with six cycles resulted in the formation of an ultrafine-grained (UFG) structure with a grain size of 400-600 nm containing nanoscale spherical metastable β′ and stable β second-phase precipitates. As a result, processed wire rods demonstrated the ultimate tensile strength (UTS) of 308 MPa and electrical conductivity of 53.1% IACS. Electrical conductivity can be increased without any notable degradation in mechanical strength of the UFG alloy by further AA at 170 °C and considerably enhanced by additional decomposition of solid solution accompanied by the formation of rod-shaped metastable β′ precipitates mainly in the ultrafine grain interior and by the decrease of the alloying element content in the Al matrix. It is demonstrated that ECAP-C can be used to process Al-Mg-Si wire rods with the specified UFG microstructure. The mechanical strength and electrical conductivity in this case are shown to be much higher than those in the industrial semi-finished products made of similar material processed by the conventional T6 or T81 treatment. OPEN ACCESSMetals 2015, 5 2149

show abstract

Section: Microstructural Features Of the Alloy Processed Via Ecap-csupporting

confidence: 58%

Section: Microstructural Features Of the Alloy Processed Via Ecap-csupporting

confidence: 56%

Section: Microstructural Features Of the Alloy Processed Via Ecap-cmentioning

confidence: 85%

Section: Microstructural Features Of the Alloy Processed Via Ecap-cmentioning

confidence: 99%

Section: Properties and Microstructure Of The Ufg Alloy Processed Viamentioning

confidence: 99%

See 3 more Smart Citations

Enhanced Mechanical Properties and Electrical Conductivity in Ultrafine-Grained Al 6101 Alloy Processed via ECAP-Conform

Murashkin

Medvedev

Kazykhanov

et al. 2015

Metals

View full text Add to dashboard Cite

show abstract

Effect of Crystallization Temperature on the Microstructures and Mechanical Properties of Enamel Substrate RT330

Tao

Yan

et al. 2016

Adv Eng Mater

View full text Add to dashboard Cite

The experimental crystallization simulates the manufacturing process of the heat sink in a heat exchanger used in nuclear power stations. The effect of the temperature of crystallization on the microstructures and mechanical properties of enamel substrate RT330 was investigated using an optical microscope, scanning electron microscope, transmission electron microscope and others. The experiment demonstrates that second-phase particles generated at the bottom of dimples enhance the RT330 mechanical properties. Due to the interaction between the precipitation and the solid solution, the density of precipitations (TiN and TiC) reaches the maximum when crystallization treatment is at 850 C.

show abstract

Ultrasonic Assisted Incremental Equal Angular Channel Pressing Process of AA 6063

Bulutsuz

2020

Adv Eng Mater

View full text Add to dashboard Cite

Recent technological developments need lightweight materials with high mechanical properties, especially in energy, automotive, and aerospace industries. [1,2] New chemical compositions have been developed with the increased demand for Al and their alloys. Moreover, to increase their mechanical properties, thermomechanical processes, such as extrusion, upsetting, and wire drawing, have widely been used for industrial applications of Al and its alloys. Severe plastic deformation (SPD) is one of the thermomechanical processes, which increases dislocation density. This increase results in finer grain sizes and increased mechanical properties, which render SPD techniques an attractive method. [3,4] Conventional methods, such as extrusion or upset forging, are able to deform, generally, external parts of materials. However, SPD methods, such as equal channel angular pressing (ECAP), can produce more homogenous strain distribution along the cross section of the material due to homogenous severe deformation. SPD methods are capable of doubling the mechanical strength while manufacturing ultrafine grain structures with mean grain sizes smaller than 400 nm. [4-6] Despite improved material properties' results of SPD techniques, most of them are still being used at the laboratory scale due to their manufacturing costs and usage difficulties. Materials size and length are the usage difficulties, which is generally restricted by die sizes. According to the literature, the ECAP is more convenient for producing longer specimens than other SPD methods for producing longer size ultrafine-grained materials. [7,8] However, this technique restricts the specimen length with its die size and plunger length, which is a significant limitation. High friction rate between the die walls and the specimen is another restriction for specimen size. Movable side walls during ECAP are developed as a solution to friction. However, the specimen length is limited to the die size. [9] Conform methods adapt continuous material feeding to SPD processes, which allow manufacturing fine-grained longer products. The conform SPD application was developed by Raab et al. in 2004 [10] for deformation of pure Al with ECAP. Various materials were used in conform methods, such as Ti G4, [11] TiNi, [12] Al6061, [13] and Al6101. [14] The most significant limitation of this method is the high friction rate between die and material. Especially, materials with low melting temperatures are effected from friction heat and result with a grain recovery that also decreases process efficiency. In the incremental ECAP (I-ECAP) process, which was first described in 2007, the material is fed step by step, and a punch deforms material between these steps; there are two separated synchronous movements of punch (deformation) and feeding system. [15] Thus, there is not a load on the specimen during feeding, which also eliminates high friction rates between die and specimen in contrast with traditional ECAP. Because of the continuous feeding of materials in the I-ECAP method, the ...

show abstract

Enhanced Strengthening in Ultrafine‐Grained Al–Mg–Si Alloys Produced via ECAP with Parallel Channels

Cited by 10 publications

References 19 publications

Enhanced Mechanical Properties and Electrical Conductivity in Ultrafine-Grained Al 6101 Alloy Processed via ECAP-Conform

Enhanced Mechanical Properties and Electrical Conductivity in Ultrafine-Grained Al 6101 Alloy Processed via ECAP-Conform

Effect of Crystallization Temperature on the Microstructures and Mechanical Properties of Enamel Substrate RT330

Ultrasonic Assisted Incremental Equal Angular Channel Pressing Process of AA 6063

Contact Info

Product

Resources

About