Formation of nanocrystalline and amorphization phase of Fe–Dy2O3 powder mixtures induced by ball milling. Issue 3 (29th December 2016)

• Record Type: Journal Article
• Authors: Huang, Jinhua; Lu, Junqiang; Ran, Guang; Chen, Nanjun; Qu, Peidong
• Is Part Of: Journal of materials research. Volume 32:Issue 3(2017)
• Page Start: 575
• Page End: 581
• Publication Date: 2016-12-29
• Subjects: neutron absorber, -- dysprosium oxide, -- Fe-based composites, -- gray control rod, -- ball milling; Materials -- Research -- Periodicals; 620.1105
• DOI: 10.1557/jmr.2016.488
• Languages: English
• ISSNs: 0884-2914

Abstract

Abstract: Abstract : Ball milling induced the formation of nanocrystalline and amorphization phase in Fe–25.68% Dy2 O3 powder mixtures (mass fraction, %). The microstructure was investigated by using X-ray diffraction and transmission electron microscopy. The transformation of Dy2 O3 from cubic to monoclinic crystal structure and then to the amorphization was observed during ball milling. A few Dy atoms were dissolved into Fe crystal structure, which was discussed using mechanical kinetics. After 48 h of ball milling, the homogenous mixtures of supersaturated nanocrystalline solid solution of Fe (Dy, O) and Dy2 O3 amorphization were formed and the elements of Fe, Dy, and O were distributed uniformly in the ball-milled particles. During the whole ball mining process, a rapid decrease in Fe grain size was observed over the initial time period, while a constant value was presented in later stage, resulting in a final size of about 20 nm. The mechanism of the microstructural evolution of powder mixtures was analyzed and discussed.