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논문 기본 정보

자료유형
학술저널
저자정보
Sourav Ganguly (National Institute of Technology Rourkela) Smarajit Sarkar (National Institute of Technology Rourkela) A. K. Mondal (Indian Institute of Technology (BHU) Varanasi)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.27 No.10
발행연도
2021.10
수록면
3,796 - 3,809 (14page)
DOI
10.1007/s12540-020-00744-3

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The present work investigates the effect of SiC nanoparticles (SiCnp) additions on the tensile properties of the squeeze-castAZ91 + 2.0Ca + 0.3Sb (wt%) alloy at ambient, 423 K and 473 K temperatures. All the AZ91 + 2.0Ca + 0.3Sb + xSiCnp [x = 0.5wt% (0.29 vol%), 1.0 wt% (0.58 vol%), and 2.0 wt% (1.16 vol%)] nanocomposites illustrate greater yield strength and ultimatetensile strength in contrast to the AZ91 + 2.0Ca + 0.3Sb alloy at all the temperatures employed. The yield strength, ultimatetensile strength and elastic modulus of both the alloy and the nanocomposites decline as the temperature increases, whereasthe work to fracture increases with a rise in temperature. Among the nanocomposites, the one comprising of 2.0SiCnp demonstratesthe best tensile properties. All the nanocomposites display superior strain hardening response than the alloy, andthe maximum strain hardening is perceived in the AZ91 + 2.0Ca + 0.3Sb + 2.0SiCnp nanocomposite. The improved tensileproperties of the nanocomposites are ascribed to the reduced grain size, the increase in dislocation density owing to Coefficientof Thermal Expansion (CTE) mismatch between the alloy and the SiC nanoparticles, the Orowan strengthening aswell as the presence of a relatively higher amount of Al2Caphase in the nanocomposites. The contribution to the improvementof strength of the nanocomposites in decreasing order of their influence are the strengthening due to CTE mismatch,the Hall?Petch strengthening, and Orowan strengthening. The fracture surfaces of the tensile specimens tested at 298 Kconfirmed the presence of transgranular cleavage fracture which remained unchanged at 473 K as well.

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