Regular Article

Synthesis and microstructure characterization of nanocrystalline NiAl intermetallic compound with molybdenum additions obtained by mechanical alloying

¹ Department of Mining and Metallurgical Engineering, Yazd University, Safayieh, Daneshgah Blvd, University Main Campus, PO Box 89195-741, Yazd, Iran
² Department of Materials Science and Engineering, Shahid Bahonar University, PO Box 76135-133, Kerman, Iran

^* Email: alikhajesarvi@stu.yazd.ac.ir

Received: 8 March 2017
Received in final form: 23 July 2017
Accepted: 31 July 2017

Abstract

Nanocrystalline Ni₅₀Al_50−xMo_x (X = 0 and 5 at.%) intermetallic powders were synthesized by mechanical alloying (MA) in a planetary ball mill. Microstructural characterization and structural changes of powder particles during mechanical alloying were studied by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The results confirmed that the synthesis behavior of NiAl intermetallic depends on the milling time and Mo content. The mechanical alloyed powders have a microstructure consisting of nanometer size particles. Mo enhance has a considerable effect on the lowering of crystallite size. The TEM image showed that the Ni₅₀Al₄₅Mo₅ nano-particles were less than 10 nm.