Producing ultrafine-grained aluminum rods by cyclic forward-backward extrusion: Study the microstructures and mechanical properties

Alihosseini, Hamid; Zaeem, Mohsen Asle; Dehghani, K.; Shivaee, Hossein Asghari

doi:10.1016/j.matlet.2012.01.102

Cited by 18 publications

(8 citation statements)

References 17 publications

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“…In the other word, the hardness increases more than 53 % at the strain of about 3. Comparison of the hardness of the sample with that in the other works done previously on the same material and plastic strain [10,20,29] shows a good agreements. The extrusion force versus displacement resulted from experimental test and FE was compared in Fig.…”

Section: Resultssupporting

confidence: 67%

Applicability of a modified backward extrusion process on commercially pure aluminum

Hosseini

Abrinia

Faraji

2015

Materials & Design (1980-2015)

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Section: Resultssupporting

confidence: 67%

Applicability of a modified backward extrusion process on commercially pure aluminum

Hosseini

Abrinia

Faraji

2015

Materials & Design (1980-2015)

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“…As an excellent propellant, ANs show advantages in combustion applications such as high heat, fast energy releasing rate, burning completeness without cluster aggregation in combustion [1,2]. Nowadays, there are various methods to prepare ANs materials mainly including: wire electrical explosive process [3,4], vacuum spray technique [5,6], ball milling [7,8], plasma evaporation [9], inhomogeneous tensile deformation [10,11], and flow-levitation method [12]. Since ANs have a large active surface area and high surface energy, they can be easily oxidized and deactivated in the air, thus, limiting their practical use in propellants.…”

Section: Introductionmentioning

confidence: 99%

Surface Nitridation of Aluminum Nanoparticles by Off-Line Operation and Its Kinetics Analysis

Dai

et al. 2018

Metals

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To improve combustion efficiency and anti-oxidation property of aluminum nanoparticles (ANs), surface nitridation of ANs was performed in a pipe furnace under the protection of nitrogen gas in a glove-operation hermetic box via an off-line nitridation process. The product was characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) analysis. A core-shell nanostructure with an aluminum nitride (AlN) coating on the ANs core was observed. The empirical kinetic triplets (Ea, A, and f(α)) for the nitridation of ANs, for the first time, were calculated and analyzed using five types of iso-conversional methods and a differentiation method. The effects of the kinetics of the reaction were investigated by simultaneous differential scanning calorimetry-thermogravimetry (DSC-TG) and thermal analysis using linear programmed temperature at different heating rates.

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“…Certain studies are presented regarding this method [13][14][15][16][17]. A novel cyclic forwardbackward extrusion (CFBE) method, consisting of the forward-backward extrusion followed by constrained back-pressing, was earlier proposed for UFG materials [18,19] production. A new backward extrusion utilizing a small diameter billet was also recently described as a technique for grain refinement [20].…”

Section: Introductionmentioning

confidence: 99%

Development of a novel high straining backward extrusion process

Wang

Zhang

et al. 2018

MATEC Web Conf.

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In this study, a new method of backward extrusion is proposed. In this new process, a punch with a movable mandrel was designed. A hollow billet was firstly backward extruded and subsequently upset with the use of the punch after the mandrel returned. The extrusion and upsetting processes were successively executed in order for a higher effective strain to be imposed and a fibrous tissue flow direction to be controlled. In order for the capability of this process to be investigated, experimental and finite element (FE) methods were used. The effective strain of the final part prepared by both the conventional and the new process were compared along the bottom radial and wall axial direction respectively. In the results, it is shown that the plastic strain applied through the processed sample was approximately higher in twice the value of the sample processed via conventional backward extrusion. Consequently, this may improve the mechanical properties and anisotropy of the final products. The difference of the UTS and the TYS between radial and tangential at the bottom was less than 3%.This new process has proven to be promising for parts with a central hole at the bottom production in order for the parts low performance to be improved.

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Producing ultrafine-grained aluminum rods by cyclic forward-backward extrusion: Study the microstructures and mechanical properties

Cited by 18 publications

References 17 publications

Applicability of a modified backward extrusion process on commercially pure aluminum

Applicability of a modified backward extrusion process on commercially pure aluminum

Surface Nitridation of Aluminum Nanoparticles by Off-Line Operation and Its Kinetics Analysis

Development of a novel high straining backward extrusion process

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