scholarly journals Discovering a new MgH2 metastable phase

RSC Advances ◽  
2018 ◽  
Vol 8 (56) ◽  
pp. 32003-32008 ◽  
Author(s):  
Mohamed Sherif El-Eskandarany ◽  
Mohammad Banyan ◽  
Fahad Al-Ajmi
Keyword(s):  
Phase Transformation ◽  
Cold Rolling ◽  
Ball Milling ◽  
Metastable Phase ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Energy Ball ◽  
Cyclic Phase

Effect of mechanically-induced cold-rolling followed by high energy ball milling on cyclic phase transformation.

A Study on Characteristics of TiH2-Al-Nb Alloyed Powder During High Energy Ball Milling

2011 ◽  
Vol 688 ◽  
pp. 1-5
Author(s):  
Hua Chen ◽  
Tian Yu Zhang ◽  
X.Y Lu ◽  
Su Qiu Jia ◽  
Zhi Long Chai
Keyword(s):  
Ball Milling ◽  
Metastable Phase ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Morphology Evolution ◽  
System Alloy ◽  
Forming Process ◽  
Mixed Powder ◽  
Tial Intermetallics ◽  
Energy Ball

In this paper, TiH2-47Al-5Nb (at.%) and TiH2-47Al-7Nb(at.%) alloys were mixed and synthesized using TiH2, Al and Nb powders. The composition and morphology evolution of the mixed powder were systematically investigated during high energy ball milling. The results show obvious that structure change of the particle during milling, and amorphous, TiAl, Ti3Al and Ti2Al phases at nanoscale are formed. The addition of Nb shows an active influence on the decomposition of TiH2and formation of TiAl-intermetallics. Compare with Ti-Al system alloy, the forming process of TiAl-intermetallics for TiH2-Al-Nb system alloy is different and slower. Ti2Al metastable phase formed after ball milling for 15 h in our experiments.

scholarly journals Влияние способа получения на аморфно-кристаллический переход в сплаве Fe-=SUB=-84-=/SUB=-B-=SUB=-16-=/SUB=-

2019 ◽  
Vol 89 (12) ◽  
pp. 1903
Author(s):  
Д.Ю. Ковалев ◽  
Н.Ф. Шкодич ◽  
С.Г. Вадченко ◽  
А.С. Рогачев ◽  
А.С. Аронин
Keyword(s):  
Amorphous Alloy ◽  
Ball Milling ◽  
Structural Changes ◽  
Metastable Phase ◽  
Diffraction Method ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Time Resolved ◽  
Short Period ◽  
Energy Ball

The amorphous-crystalline transitions in Fe84B16 alloy received by spinning melt and high-energy ball milling have been studied. Using time-resolved X-ray diffraction method, it has been shown that the kinetics of transition in crystalline state depends on the method of metastable alloy production. In amorphous alloy Fe84B16, received by spinning melt, the crystallization process goes on for a short period of time not exceeding 1 s and is accompanied by formation of eutectic α-Fe-Fe3B. At a temperature of more than 600 ℃ metastable phase Fe3B transition into Fe2B and α-Fe. In amorphous alloy Fe84B16, received by high-energy ball milling, structural changes occur within 4-8 s and transition in state with perfect crystalline structure associated with growth of nanoscale crystallites.

Hydrogenation of Nanocrystalline Mg2Ni Alloy Prepared by High Energy Ball-Milling Followed by Equal-Channel Angular Pressing or Cold Rolling

2014 ◽  
Vol 93 ◽  
pp. 112-117 ◽  
Author(s):  
Ádám Révész ◽  
Marcell Gajdics ◽  
Lajos K. Varga ◽  
Tony Spassov
Keyword(s):  
Cold Rolling ◽  
Ball Milling ◽  
Equal Channel Angular Pressing ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Kinetic Measurements ◽  
Angular Pressing ◽  
Profile Fitting ◽  
Fitting Method ◽  
Energy Ball

Nanocrystalline Mg2Ni powders produced by high energy ball milling (HEBM) were subjected to further severe plastic deformation by cold rolling (CR) or equal-channel angular pressing (ECAP). The microstructure of the alloys have been analysed by the Convolutional whole profile fitting method of the X-ray line profiles. The hydrogenation behavior has been studied by absorption kinetic measurements.

Phase transformation of the CuAl2 intermetallic alloy during high-energy ball-milling

2015 ◽  
Vol 61 ◽  
pp. 51-55 ◽  
Author(s):  
Felipe de la Rosa ◽  
J.R. Romero-Romero ◽  
J. Luis López-Miranda ◽  
A.G. Hernández-Torres ◽  
G. Rosas
Keyword(s):  
Phase Transformation ◽  
Ball Milling ◽  
High Energy ◽  
Intermetallic Alloy ◽  
High Energy Ball Milling ◽  
Energy Ball

Solid state reactions between Pd and Si induced by high energy ball milling

1994 ◽  
Vol 9 (1) ◽  
pp. 53-60 ◽  
Author(s):  
D.L. Zhang ◽  
T.B. Massalski
Keyword(s):  
Solid State ◽  
Ball Milling ◽  
Amorphous Phase ◽  
Metastable Phase ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Solid State Reactions ◽  
Scanning Calorimetry ◽  
Energy Ball ◽  
Si Content

Solid state reactions induced by high energy ball milling between Pd and Si have been studied. X-ray diffractometry and differential scanning calorimetry have been used to characterize the resulting phases. During milling, Pd and Si react by diffusion to form different phases depending on the Si content in the starting mixture. With a low Si content of 19 at. %, an amorphous phase forms of the same composition. On continued milling, this amorphous phase partially crystallizes into Pd9Si2 and Pd2Si compounds. With the Si content equal to or higher than 33 at. %, no amorphous phases were observed. Instead, the Pd2Si phase is produced. For powder composition corresponding to the stoichiometric compound Pd2Si (33 at. % Si), the Pd2Si forms and remains stable during further milling. With Si content equal to or higher than 50 at. %, the initially produced Pd2Si is destabilized by a reaction with the remaining Si to form PdSi, which is a metastable phase at the temperature of ball milling. It is very unlikely that an amorphous phase of a composition equal to or higher than 33 at. % Si could be produced by ball milling in the Pd-Si system. This is because the Pd2Si phase forms very easily through the reaction between Pd and Si, and this reaction competes effectively with glass formation.

High-Energy Ball-Milling of FeAl2 and Fe2Al5 Intermetallic Systems

2013 ◽  
Vol 755 ◽  
pp. 47-52 ◽  
Author(s):  
J.R. Romero-Romero ◽  
J. Luis López-Miranda ◽  
R. Esparza ◽  
M.A. Espinosa-Medina ◽  
G. Rosas
Keyword(s):  
Electron Microscopy ◽  
Phase Transformation ◽  
Ball Milling ◽  
High Energy ◽  
Milling Process ◽  
High Energy Ball Milling ◽  
High Symmetry ◽  
Scanning Calorimetry ◽  
Casting Technique ◽  
Energy Ball

In this study, FeAl2 and Fe2Al5 intermetallic alloys were prepared by conventional casting technique. In order to study their structural stability the alloys were subjected to high-energy ball milling process for 1, 2.5, 5 and 10 h. The structural and chemical characterizations were conducted by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and differential scanning calorimetry. After 10 h of milling, the experimental results indicated a phase transformation from FeAl2-triclinic phase to Fe2Al5-ortorrombic structure. This phase transformation is characterized by a change from low to high symmetry systems.

High-Energy Ball Milling of Ni-Ti and Ni-Ti-Nb Powders

2006 ◽  
Vol 530-531 ◽  
pp. 211-216 ◽  
Author(s):  
C.B. Martins ◽  
Gilbert Silva ◽  
Bruno Bacci Fernandes ◽  
Erika Coaglia Trindade Ramos ◽  
D.A. Mardegan ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Ball Milling ◽  
Metastable Phase ◽  
High Energy ◽  
Milling Process ◽  
High Energy Ball Milling ◽  
Heat Treated ◽  
Niti Phase ◽  
Energy Ball ◽  
Two Phases

This work reports on the preparation of Ni-50Ti and Ni-40Ti-10Nb and Ni-30Ti- 20Nb (at.%) powders by high-energy ball milling and subsequent heat treatment. The milling process was carried out at room temperature in a planetary ball mill under Ar atmosphere. The as-milled powders were than heat-treated at 900oC for 1h under Ar atmosphere. X-ray diffraction (XRD), scanning electron microscopy (SEM), and microanalysis via energy dispersive spectroscopy (EDS) were used to characterize the milled and heat-treated powders. A metastable phase was initially formed in Ni-50Ti and Ni-40Ti-10Nb powders milled for 1h. Following the ball milling, the B2-NiTi compound was formed in these powder mixtures. The disordering of the B2-NiTi compound occurred owing the internal lattice strain after milling for 30h. Two phases were identified in Ni-50Ti and Ni-40Ti-10Nb powders milled for 60h: the metastable phase previously reported, and an amorphous phase. In Ni-30Ti-20Nb powders, it was noted the presence of an amorphous halo only. A structural relaxation of the B2-NiTi phase occurred in heat-treated Ni-50Ti, Ni-40Ti-10Nb, and Ni-30Ti-20Nb powders. A small amount of Ni3Ti and NiTi2 was also formed after heat treatment at 900oC for 1h, and an iron contamination lower than 2at.% was found.

Sign in / Sign up

Export Citation Format

Share Document