Impression creep behaviour of ultrasonically processed in-situ Al3Zr-Al alloy composite in as-cast condition

Gupta, Rahul; Daniel, B.S.S.

doi:10.1016/j.matchar.2020.110594

Cited by 16 publications

(5 citation statements)

References 41 publications

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“…Thus steady state creep strain rate is the minimum creep strain rate at a given stress and temperature. Impression creep behaviour of AA6061 alloy has already been studied in earlier works [6], [7]. Impression depth i.e., depth of indentation in "mm" has been plotted with respect to time.…”

Section: Resultsmentioning

confidence: 99%

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An initial study on the impression creep behaviour of stir-cast GNP reinforced AA6061 composite (AMMC)

Khokhar

Khajuria

Bedi

2022

IOP Conf. Ser.: Mater. Sci. Eng.

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Impression creep testing technique is used to screen out creep behaviour of materials as it is relatively faster method, requires small volume of the specimen, and is relatively material non-invasive technique when compared to conventional uniaxial tensile creep test method. This technique also possesses the benefit of maintaining constant stress throughout the experiment because a flat cylindrical indenter is used to apply load on the specimen. Owing to commercial unavailability of the materials under development such as metal matrix composites (MMC), the impression creep testing approach for such materials becomes a best method. In present work, creep behaviour of stir-cast graphene nanoplatelets (GNP) reinforced AA6061 composite (AMMC) is studied by using impression creep tests. The AMMC was prepared by adding GNPs in AA6061 through stir casting process by melting the alloy up to 1073 K. The impression creep experimentation included stress levels of 140 MPa, 170 MPa, and 200 MPa at a temperature of 573 K, 603 K and 633 K. The tests were conducted at constant stress by varying the temperature and vice-versa in vacuum. Two distinct regions i.e., primary and secondary/steady-state were observed and minimum creep strain rate was obtained in steady-state region. Tertiary region was absent, since the load/stress applied was compressive. During the experiment, depth of indentation of 0.03 mm to 0.14 mm was produced in the specimen. The microstructure of the composite has been analyzed using optical microscope and scanning electron microscope (SEM) to correlate with impression creep behaviour of the studied materials.

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Section: Resultsmentioning

confidence: 99%

“…Impression creep curves of the AA6061 alloy tested under different stress levels at (a) 543K; (b) 573 K and (c) 603 K[6],[7] …”

mentioning

confidence: 99%

An initial study on the impression creep behaviour of stir-cast GNP reinforced AA6061 composite (AMMC)

Khokhar

Khajuria

Bedi

2022

IOP Conf. Ser.: Mater. Sci. Eng.

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“…No other intermetallics were observed from the SEM micrographs and it may be due to the presence of thermodynamically stable nano Y 2 O 3 particles. Alike outcomes have been accounted by Rahul Gupta et al [17] in their study on creep properties of ultrasonically processed in-situ Al 3 Zr-Al alloy composites. The UT acoustic streaming and cavitation non-linear effect gives e cient stirring and signi cantly modi ed the primary Al and eutectic Si morphology.…”

Section: Microstructure Analysismentioning

confidence: 99%

Microstructure and mechanical properties of ultrasonically processed Al-7Si alloy / Y2O3 nanocomposite.

Kumar

Nampoothiri

Shalini

2022

Silicon

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The aim of the present study is to investigate the microstructure and mechanical properties of the A356 aluminum metal matrix composite reinforced with Y 2 O 3 particles. The composite is synthesized by adding 1 and 2 vol.% of reinforcement via stir casting assisted by ultrasonic treatment (UT). Microstructural contemplates shows improvement in the dispersion of nano Y 2 O 3 particles and decrease in the porosity level due to the ultrasound aided synthesis. The UT re nes the size of the Y 2 O 3 particles as well as helps to improve its dispersion. The secondary dendrite arm spacing of 2 vol.% Y 2 O 3 reinforced samples with 5 min UT is found to be signi cantly reduced to 12 µm as compared to that of the as-cast A356 alloy. Addition of 2 vol.% of nano Y 2 O 3 has signi cantly improved the hardness of the A356 alloy from 60 HV to 108 HV. A considerable increment in the YS and TS of the A356 alloy is observed with the of Y 2 O 3 and found to further improve with UT. However, small reduction in ductility is observed with the addition of Y 2 O 3 as well as ultrasonic treatment.

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“…Figure 7 shows the average hardness values for the composites reinforced with 1 vol. [17] in their study on A356/nano-SiC p reinforced composites. The UT also improves the % of elongation and the elongation of 1 vol.% nano Y 2 O 3 particle added composite with UT is higher than that of 2 vol.% nano Y 2 O 3 particle added composite with UT.…”

Section: Hardness Measrementmentioning

confidence: 99%

Microstructure And Mechanical Properties of Ultrasonically Processed Al-7Si Alloy / Y2O3 Nanocomposite

Kumar

Nampoothiri

Shalini

2021

Preprint

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The aim of the present study is to investigate the microstructure and mechanical properties of the A356 aluminum metal matrix composite reinforced with Y2O3 particles. The composite is synthesized by adding 1 and 2 vol.% of reinforcement via stir casting assisted by ultrasonic treatment (UT). Microstructural contemplates shows improvement in the dispersion of nano Y2O3 particles and decrease in the porosity level due to the ultrasound aided synthesis. The UT refines the size of the Y2O3 particles as well as helps to improve its dispersion. The secondary dendrite arm spacing of 2 vol.% Y2O3 reinforced samples with 5 min UT is found to be significantly reduced to 12 µm as compared to that of the as-cast A356 alloy. Addition of 2 vol.% of nano Y2O3 has significantly improved the hardness of the A356 alloy from 60 HV to 108 HV. A considerable increment in the YS and TS of the A356 alloy is observed with the of Y2O3 and found to further improve with UT. However, small reduction in ductility is observed with the addition of Y2O3 as well as ultrasonic treatment.

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Impression creep behaviour of ultrasonically processed in-situ Al3Zr-Al alloy composite in as-cast condition

Cited by 16 publications

References 41 publications

An initial study on the impression creep behaviour of stir-cast GNP reinforced AA6061 composite (AMMC)

An initial study on the impression creep behaviour of stir-cast GNP reinforced AA6061 composite (AMMC)

Microstructure and mechanical properties of ultrasonically processed Al-7Si alloy / Y2O3 nanocomposite.

Microstructure And Mechanical Properties of Ultrasonically Processed Al-7Si Alloy / Y2O3 Nanocomposite

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