Microstructural development during hot forging of Al 7075 powder

Joshi, Tilak C.; Prakash, U.; Dabhade, Vikram V.

doi:10.1016/j.jallcom.2015.03.099

Cited by 33 publications

(11 citation statements)

References 18 publications

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“…Therefore, the mechanical response of the material and the effect of strain rate must be investigated in the area of interest. At high temperatures, materials generally become much more ductile and can also exhibit microstructural changes due to recrystallization phenomena [90][91][92][93]. At low temperatures, however, the strength of the material generally increases, and the mechanical behavior changes from ductile to brittle.…”

Section: Experimental Test At High-temperaturementioning

confidence: 99%

Review of Intermediate Strain Rate Testing Devices

Bhujangrao

Froustey

Iriondo

et al. 2020

Metals

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Materials undergo various loading conditions during different manufacturing processes, including varying strain rates and temperatures. Research has shown that the deformation of metals and alloys during manufacturing processes such as metal forming, machining, and friction stir welding (FSW), can reach a strain rate ranging from 10−1 to 106 s−1. Hence, studying the flow behavior of materials at different strain rates is important to understanding the material response during manufacturing processes. Experimental data for a low strain rate of <101 s−1 and a high strain rate of >103 s−1 are readily available by using traditional testing devices such as a servo-hydraulic testing machine and the split Hopkinson pressure bar method, respectively. However, for the intermediate strain rate (101 to 103 s−1), very few testing devices are available. Testing the intermediate strain rate requires a demanding test regime, in which researchers have expanded the use of special instruments. This review paper describes the development and evolution of the existing intermediate strain rate testing devices. They are divided based on the loading mechanism; it includes the high-speed servo-hydraulic testing machines, hybrid testing apparatus, the drop tower, and the flywheel machine. A general description of the testing device is systematically reviewed; which includes the working principles, some critical theories, technological innovation in load measurement techniques, components of the device, basic technical assumption, and measuring techniques. In addition, some research direction on future implementation and development of an intermediate strain rate apparatus is also discussed in detail.

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Section: Experimental Test At High-temperaturementioning

confidence: 99%

Review of Intermediate Strain Rate Testing Devices

Bhujangrao

Froustey

Iriondo

et al. 2020

Metals

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“…The powder metallurgy (PM) route provides lower energy consumption, higher material utilisation and excellent machinability in aluminium [1]. PM technology can present a homogeneous microstructure with little segregation compared with the casting method [2].…”

Section: Introductionmentioning

confidence: 99%

Effects of Sintering Temperature on Densification, Microstructure and Mechanical Properties of Al-Based Alloy by High-Velocity Compaction

Yuan

Yin

et al. 2021

Metals

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This present work investigates the effects of sintering temperature on densification, mechanical properties and microstructure of Al-based alloy pressed by high-velocity compaction. The green samples were heated under the flow of high pure (99.99 wt%) N2. The heating rate was 4 °C/min before 315 °C. For reducing the residual stress, the samples were isothermally held for one h. Then, the specimens were respectively heated at the rate of 10 °C/min to the temperature between 540 °C and 700 °C, held for one h, and then furnace-cooled to the room temperature. Results indicate that when the sintered temperature was 640 °C, both the sintered density and mechanical properties was optimum. Differential Scanning Calorimetry, X-ray diffraction of sintered samples, Scanning Electron Microscopy, Energy Dispersive Spectroscopy, and Transmission Electron Microscope were used to analyse the microstructure and phases.

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“…Powder metallurgy (P/M), which is the manufacturing of parts from powder material, offers high material utilization, production of nearnet shaped parts, and reduction or elimination of the costs related with complex machining operations [1][2][3]. Al P/M alloys have a wide range of applications such as hand tools, office machinery and automotive.…”

Section: Introductionmentioning

confidence: 99%

“…It has been suggested that the formation of the spinel layer arising from the reaction of Mg and the alumina layer would impose the requirement for a higher applied load to break the oxide layer [20]. Alternatively, forging of aluminum P/M products is known to close the residual porosity and disrupts the oxide film around the powder particles because of the high strains and strain rates involved [1]. This enhances the metallurgical bonding across the interfaces where the oxide layer is broken [1].…”

Section: Introductionmentioning

confidence: 99%

Spark plasma sintering and spark plasma upsetting of an Al-Zn-Mg-Cu alloy

Tünçay

Bishop

Brochu

2017

Materials Science and Engineering: A

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Al-Zn-Mg-Cu alloy powder Alumix 431D was sintered at 400°C by spark plasma sintering (SPS) and upset forging was applied to the sintered sample through SPS. Densities of 99.1 ± 0.3% and 99.8 ± 0.1% of theoretical were obtained for the sintered and forged samples, respectively. T6 temper was carried out on the samples and microstructure analysis and mechanical properties before and after heat treatment were evaluated. Microhardness of 173 ± 3 and 172 ± 3 HV were attained in the T6 temper of as-sintered and forged samples, respectively. The flexural strength and strain values were significantly improved after the forging process, which can be mainly attributed to the better particle bonding in addition to the occurrence of some recrystallization. Significant loss in the ductility was observed after the T6 temper.

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Microstructural development during hot forging of Al 7075 powder

Cited by 33 publications

References 18 publications

Review of Intermediate Strain Rate Testing Devices

Review of Intermediate Strain Rate Testing Devices

Effects of Sintering Temperature on Densification, Microstructure and Mechanical Properties of Al-Based Alloy by High-Velocity Compaction

Spark plasma sintering and spark plasma upsetting of an Al-Zn-Mg-Cu alloy

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