Explosive compaction of Al2O3 nanopowders

Wang, Bingfeng; Xie, Fangyu; Li, Zhicheng; Hong, Zhang

doi:10.1016/j.ceramint.2016.02.066

Cited by 16 publications

(4 citation statements)

References 27 publications

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“…In recent years, shock compaction has been applied by many studies to compact a wide range of powdered materials such as metal matrix composites, 13 polymers, 14 and ceramics. 15 In the shock compaction technique, shock waves are generated by two different methods. The first, which is the indirect method, includes high-velocity impact of a flyer plate or piston against the powder particles placed in the die.…”

Section: Shock Compaction Techniquementioning

confidence: 99%

“…25 Another technique based on direct application of explosive charge in powder compaction process has been used by many scholars for a wide range of powders. 15,26–28 This method, which is called the direct shock compaction, includes passage of shock waves through the powder particles due to detonation of explosive charge. The propagation velocity of shock waves is greater than the velocity of sound in the powdered material.…”

Section: Shock Compaction Techniquementioning

confidence: 99%

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Modeling and prediction of metallic powder behavior in explosive compaction process by using genetic programming method based on dimensionless numbers

Alitavoli

Khaleghi

Babaei

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part E:

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Explosive compaction process of metallic powders has been studied using a semi-empirical method. This method utilizes dimensional analysis along with genetic programming approach to obtain an expression relating the final density of compacts to the effective parameters during compaction process such as shock compaction energy, properties of metallic powder, and geometry of the problem and explosive charge. Dimensionless numbers have been constructed based on the effective parameters using a complete set of input–output experimental data. The obtained dimensionless numbers then have been applied as input–output data pairs for genetic programming optimization process considering modeling error as the objective. The obtained results show that the proposed model using dimensional analysis method along with genetic programming can predict the final density of compacts with 99.8% accuracy. Also, the outputs of the proposed model have been compared with those obtained by group method of data handling type neural network in the literature. Consequently, genetic programming method has much less root mean square error than group method of data handling model and can be successfully used for modeling and prediction of the complex process behavior.

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Section: Shock Compaction Techniquementioning

confidence: 99%

Section: Shock Compaction Techniquementioning

confidence: 99%

Modeling and prediction of metallic powder behavior in explosive compaction process by using genetic programming method based on dimensionless numbers

Alitavoli

Khaleghi

Babaei

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part E:

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“…Rapid solidification technology is a rapidly advancing field, and unique microstructures of metallic alloys and ceramics have been created [ 15 , 16 , 17 , 18 , 19 ]. Shock consolidation (SC) is a unique technique, using a shock wave generated by explosion or impact, shows considerable promise for producing bulk material from powders [ 19 ].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Nanocrystalline AlCoCrFeNi High Entropy Alloy through Shock Consolidation and Mechanical Alloying

Arab

Guo

Zhou

et al. 2019

Entropy

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High entropy alloys (HEAs) are usually fabricated using arc melting which has the disadvantages of diseconomy, and the limitations in the shape and size of final products. However, recently, quite a large amount of research has been carried out to find the fabrication techniques for HEAs with better properties such as mechanical alloying and rapid solidification. In this paper, an AlCoCrFeNi high entropy alloy was successfully fabricated by the shock consolidation technique. In this method, the starting powders were mixed by mechanical alloying and then the shock wave was imposed to the compacted powders by explosion. High levels of residual stress existed in samples fabricated by the shock consolidation method. Due to this, after fabrication of the sample, heat treatment was used to eliminate the residual stress and improve the mechanical properties. The microstructure of the samples before and after heat treatment were examined by XRD, SEM and electron backscatter diffraction (EBSD). The shock consolidated sample and sample with heat treatment both showed the nano-structure. After heat treatment the hardness of the sample was decreased from 715 HV to the 624 HV, however the failure strength increased, and as expected the ductility of the sample was improved after heat treatment.

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“…Owing to these characteristics, explosive consolidation has been researched. Wang utilized explosive consolidation to prepare a dense, high-volume Al 2 O 3 rod with nanostructures [23]. Farinha et al successfully synthesized two different sizes of stainless steel powders and produced crack-free blocks through explosive consolidation [24].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Bulk Amorphous Alloy from Fe-Base Powders by Explosive Consolidation

et al. 2018

Metals

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A Fe61Cr2Nb3Si12B22 amorphous alloy rod sample of 8.8 mm diameter has been successfully prepared through explosive consolidation. The structure and thermal stability of the as-synthesized sample have been analyzed through X-ray diffraction (XRD) and differential scanning calorimeter (DSC) analysis. The results demonstrate that the sample still retains an amorphous structure, and the glass transition temperature (Tg), the crystallization onset temperature (Tx), the supercooled liquid zone (ΔTx) (Tx − Tg) and the reduced glass transition temperatures (Trg) (Tg/Tm) are 784 K, 812 K, 28 K, and 0.556, respectively. Its microstructure has been investigated by optical microscopy (OM) and scanning electron microscopy (SEM). The average microhardness of the alumina compact is about 1069 HV.

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Explosive compaction of Al2O3 nanopowders

Cited by 16 publications

References 27 publications

Modeling and prediction of metallic powder behavior in explosive compaction process by using genetic programming method based on dimensionless numbers

Modeling and prediction of metallic powder behavior in explosive compaction process by using genetic programming method based on dimensionless numbers

Fabrication of Nanocrystalline AlCoCrFeNi High Entropy Alloy through Shock Consolidation and Mechanical Alloying

Synthesis of Bulk Amorphous Alloy from Fe-Base Powders by Explosive Consolidation

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