Synthesis of the Mg2Ni Alloy Prepared by Mechanical Alloying Using a High Energy Ball Mill

Abstract

Mg2Ni was synthesized by a solid state reaction from the constituent elemental powder mixtures via mechanical alloying. The mixture was ball milled for 10 h at room temperature in an argon atmosphere. The high energy ball mill used here was fabricated at ININ. A hardened steel vial and three steel balls of 12.7 mm in diameter were used for milling. The ball to powder weight ratio was 10:1. A small amount of powder was removed at regular intervals to monitor the structural changes. All the steps were performed in a little lucite glove box under argon gas, this glove box was also constructed in our Institute. The structural evolution during milling was characterized by X-ray diffraction and scanning electron microscopy techniques. The hydrogen reaction was carried out in a micro-reactor under controlledconditions of pressure and temperature. The hydrogen storage properties of mechanically milled powders were evaluated by using a TGA system. Although homogeneous refining and alloying take place efficiently by repeated forging, the process time can be reduced to one fiftieth of the time necessary for conventional mechanical milling and attrition.
 
 
 

Synthesis of Mg2Ni using stoichiometric and superstoichiometric compositions for hydrogen storage applications

“…The synthesis of intermetallic Mg 2 Ni using ball milling requires long duration milling with time ranging from 20 to 100 hours, as mentioned in various literature reports 36‐39 . The long milling time frequently causes difficulties such as contamination of alloy due to material that wears out from balls and the milling bowl, besides this alloy often sticks on milling balls and bowl inner wall and sometimes results in the formation of oxides 40 . The milling time is significantly reduced when the ball milling is followed by annealing 41‐43 .…”

A Comprehensive Review on Hydrogen Absorption Behaviour of Metal Alloys Prepared through Mechanical Alloying

“…In most cases, the rate of hydrogenation has been greatly enhanced when compared with that of materials prepared through conventional equilibrium methods, but due to the amorphous nature of milled alloys, a loss of hydrogen content was observed [25]. MA provides various advantages, including smaller restrictions with respect to composition and works much better when applied to A 2 B alloys [29]. Moreover, through the use of MA method, nano-crystalline alloys are obtained, starting either with a pre-prepared alloy or with a mixture of pure elemental metals [28].…”

Ball-Milled and Acid-Treated Mineral Activated Carbon as Hydrogen Storage Material

“…Some of the most common approaches are the use of compressed gases [4][5][6] and cryogenic liquids [7][8][9]. On the other hand, some research centers have conducted studies on the development of new compounds for hydrogen storage in solids which include metals and alloys [10][11][12][13][14][15][16], complex hydrides, e.g., alanates [17][18][19][20][21][22], among other chemicals. However, the reactions of the latter are irreversible, so they cannot serve as a basis for a rechargeable hydrogen storage system.…”