Activation volume and the role of solute atoms in Al-Mg-Si alloy processed by equal channel angular extrusion

Soula, Amel; Couzinié, Jean-Philippe; Heni, Hanen; Bourgon, Julie; Champion, Yannick; Njah, Nabil

doi:10.1016/j.jallcom.2021.163334

Cited by 5 publications

(4 citation statements)

References 71 publications

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“…These values are much higher than those expected for dislocation based deformation mechanisms; they are consistent rather with deformation by emission of dislocations from GB and TB i.e. the inverse Cottrell-Stokes (ICS) regime[79][80][81]. In the present alloy, the high twin density observed after ECAP (Fig.3, 7) promotes the emission of dislocations (perfect1 2 < 110 > or Shockley partials 1 6…”

supporting

confidence: 77%

“…The higher values of V* as were calculated from the data of table 1 are due to an overestimation of the dislocation free path since other factors can contribute to pinning like solute atoms. Furthermore, it has been shown that this effect is more important at low SR where the waiting time for dislocations the overcome a barrier is sufficient for solute atoms to segregate and pin the dislocations [81].…”

Section: Comparison With Nanoindentation (Ni) Resultsmentioning

confidence: 99%

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Microstructure and activation volume of a Cu-6 wt %Zn brass processed by equal channel angular pressing

Turki,

Guelorget,

Optasanu

et al. 2023

Journal of Alloys and Compounds

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supporting

confidence: 77%

Section: Comparison With Nanoindentation (Ni) Resultsmentioning

confidence: 99%

Microstructure and activation volume of a Cu-6 wt %Zn brass processed by equal channel angular pressing

Turki,

Guelorget,

Optasanu

et al. 2023

Journal of Alloys and Compounds

Self Cite

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“…The normalized activation volume increases with the increase in deformation temperature. It is reported [ 51 ] that when the grain size ranges from 6 to 40 μm, V * = 100 − 300 b 3 , in this case, trans-granular dislocation slip occurs, but when V * < 1 − 10 b 3 , grain boundary sliding occurs in nanometer material. The experimental grain sizes of 6.42 and 22.32 μm fall into the range of 6–40 μm.…”

Section: Discussionmentioning

confidence: 99%

High Strain Rate Quasi-Superplasticity Behavior in an Ultralight Mg-9.55Li-2.92Al-0.027Y-0.026Mn Alloy Fabricated by Multidirectional Forging and Asymmetrical Rolling

et al. 2022

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To explore new approaches to severe plastic deformation and the ductility of a multicomponent magnesium–lithium alloy, an ultralight microduplex Mg-9.55Li-2.92Al-0.027Y-0.026Mn alloy was made by novel multidirectional forging and asymmetrical rolling, and the superplasticity behavior was investigated by optical microscope, hot tensile test, and modeling. The average grain size is 1.9 μm in this alloy after multidirectional forging and asymmetrical rolling. Remarkable grain refinement caused by such a forming, which turns the as-cast grain size of 144.68 μm into the as-rolled grain size of 1.9 μm, is achieved. The elongation to failure of 228.05% is obtained at 523 K and 1 × 10−2 s−1, which demonstrates the high strain rate quasi-superplasticity. The maximum elongation to failure of 287.12% was achieved in this alloy at 573 K and 5 × 10−4 s−1. It was found that strain-induced grain coarsening at 523 K is much weaker than the strain-induced grain coarsening at 573 K. Thus, the ductility of 228.05% is suitable for application in high strain rate superplastic forming. The stress exponent of 3 and the average activation energy for deformation of 50.06 kJ/mol indicate that the rate-controlling deformation mechanism is dislocation-glide controlled by pipe diffusion.

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“…During the AAT process, the aging time and temperature have significant influences on the mechanical properties of aluminum alloy [11,12]. The typical precipitation sequence of 6000 series aluminum alloys during the artificial aging process is α (SSSS)→GP (Guinier Preston) zone→β ′′ →β ′ →β; the α (SSSS) signifies a supersaturated solid solution [13]. It is well known that the type, size, shape, and distribution of the precipitates have a significant influence on the comprehensive mechanical properties of 6000 series aluminum alloys.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Microstructural Evolution of 6082 Aluminum Alloy with Different Heat Treatment Methods

Xia,

Ye,

Qiu

et al. 2024

Coatings

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The influence of solid solution treatment (SST), artificial aging treatment (AAT), and deep cryogenic-aging treatment (DCAT) on the mechanical properties and microstructure evolution of 6082 aluminum alloy was investigated. The tensile test was performed to obtain the true stress–strain curves through an electronic universal testing machine. The results show that the yield strengths of the SST specimens in all three directions are the lowest, of less than 200 MPa. In addition, the maximum elongation of the SST specimen is over 16% and the value of in-plane anisotropy (IPA) is 5.40%. For the AAT specimen, the yield strengths of the AAT alloy in three directions have distinct improvements, which are beyond 340 MPa. However, the maximum elongation and the IPA were evidently reduced. The yield strength and elongation of the DCAT alloy exhibit a slight enhancement compared with those in the AAT condition, and the corresponding IPA is 0.61%. The studied alloy specimens in all conditions exhibit ductile fracture. The DCAT alloy has the highest density of precipitates with the smallest size. Therefore, the dislocation pinning effect of the DCAT specimens are the strongest, which exhibit the highest yield strength accordingly. In addition, the uniformly distributed precipitates in the matrix with a large ratio of long and short axes can suppress the anisotropy caused by elongated grains.

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Activation volume and the role of solute atoms in Al-Mg-Si alloy processed by equal channel angular extrusion

Cited by 5 publications

References 71 publications

Microstructure and activation volume of a Cu-6 wt %Zn brass processed by equal channel angular pressing

Microstructure and activation volume of a Cu-6 wt %Zn brass processed by equal channel angular pressing

High Strain Rate Quasi-Superplasticity Behavior in an Ultralight Mg-9.55Li-2.92Al-0.027Y-0.026Mn Alloy Fabricated by Multidirectional Forging and Asymmetrical Rolling

Mechanical Properties and Microstructural Evolution of 6082 Aluminum Alloy with Different Heat Treatment Methods

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