Cover Page May-2019-Advanced Materials Letters

Advanced Materials Letters

Volume 10, Issue 5, Pages 361-365, May 2019
About Cover

Graphene has emerged as the most popular subject area in the active research field since its discovery in 2004. The published documents illustrate the popularity of Graphene research and innovations, spontaneously increased from about 150 in 2004 to 21,500 in 2018. Graphene is relatively young but high-hope for markets. The cover photo of May 2019 issue describes the structure of a cylindrical Graphene to celebrate the 15th anniversary of it's discovery.


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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