Milling media and alloying effects on synthesis and characteristics of mechanically alloyed ODS heavy tungsten alloys

Compositional and Structural Evolution during Ball Milling of Ti-based Metallic Glass Powder

“…The change of alloy composition due to abrasion and contamination of milling media,direct crystallization and oxidation caused by rise of local temperature at collision region on powder trapped by milling balls or milling ball-vial, and stress induced crystallization from shear bands development which act as preferred site for nanocrystals precipitation are the possible reasons ofthe structural evolution on MG powder during ball milling [9], [12].…”

“…Milling parameters to convert ribbon into powder plays an important role to determine structure and properties of generated amorphous powder. The process feasibility and bulk product quality such as mechanical and chemical properties will be influenced by state of initial powder [8], [9].Exceeds milling time and cycles can be the purpose of both powder contamination and crystallization due to the stress and temperature elevation during milling process. On the other hand, the interaction between powder and milling media (both of vial and balls) material also determines the powder composition obtained from milling process.…”

“…In addition, low GFA Ti-based MGs indicating low thermal and mechanical stabilization are susceptible to loss their amorphous nature as a result of thermal and mechanical working during powder milling. So, optimum milling condition and milling media selection must be reached to obtain high quality powder [9], [10]. Nevertheless, the informations regarding milling parameters effect on Ti-based MG powder structure and thermal properties have never been revealed by previous studies.…”

The Effect of Mo and Dispersoids on Microstructure, Sintering Behavior, and Mechanical Properties of W-Mo-Ni-Fe-Co Heavy Tungsten Alloys

“…In WHAs, nickel, iron, copper, and cobalt elements are commonly added to a tungsten matrix and serve as a binder phase, which helps in providing ductility to the materials [5][6][7]. In recent years, oxide dispersion strengthened (ODS) tungsten heavy alloys have attracted attention as potential high temperature structural materials [8][9][10][11][12]. The nano-oxide dispersed particles can be intentionally introduced or formed in-situ by mechanical alloying, which can further enhance high temperature strength and ductility of materials [6].…”

“…The ODS WHAs are normally produced by mechanical alloying, which is a solid-state powder metallurgy processing technique that involves repeated cold welding, fracturing and rewelding of powder particles. During mechanical alloying, some parameters should be taken into account to prevent material contamination, such as grinding media materials, the process control agent (PCA), and the milling atmosphere [9,10].…”