Effect of diamantane on the thermal stability of cryomilled aluminum alloy

Walid M. Hanna1*, Farghalli A. Mohamed2

1Materials Engineering Department, Military Technical College, KobryElkoba, Cairo, 11843, Egypt

2Department of Chemical Engineering and Materials Science, University of California, Irvine, CA92697, USA

Adv. Mater. Lett., 2019, 10 (5), pp 361-365

DOI: 10.5185/amlett.2019.2282

Publication Date (Web): Jan 14, 2019

E-mail: whanna1975@gmail.com

Abstract


The thermal stability behavior of Al-5083 cryomilled nanocrystalline powders stabilized by diamantane nanoparticles was studied in comparison with the alloy without diamantane. Nanocrystalline Al 5083 powders were produced by mechanical milling in a liquid nitrogen medium. The results revealed that Al 5083 with diamantane showed higher thermal stability than the cryomilled alloy without diamantane in the temperature limit from 473 °K to 773 °K (0.56 to 0.91Tm) for various annealing times from 0.5 h to 48 h. In this regard, calculations showed that while the grain size was still in the nano scale in the presence of diamantane, it was in the ultrafine range (> 150 nm) in the absence of diamantane. The above finding was qualitatively explained in terms of Zener’s concept.

Keywords

Cryomilling, Diamantane, grain boundaries, nanocrystalline materials, thermal stability.

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