A study on preparation and mechanism of Ni based ternary alloy

2019 ◽  
Vol 9 (6) ◽  
pp. 681-685
Author(s):  
Hong Shi ◽  
Minghui Liu ◽  
Lin Cong ◽  
Lizhong Wang
Keyword(s):  
Tensile Strength ◽  
Amorphous Alloy ◽  
Mechanical Alloying ◽  
X Ray Diffraction ◽  
Upward Trend ◽  
Mechanically Alloyed ◽  
X Ray ◽  
Alloy Material ◽  
Stress Changes ◽  
High Internal Stress

In this paper, the preparation of Ni–Ti–Nb amorphous alloy materials made by mechanical alloying method has been studied. The Ni–Ti–Nb mixed powders obtained by different mechanical alloying times have been analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results show that the Ni–Ti–Nb mixed powders can be mechanically alloyed after milling for 10 hours, and retained with ball milling. Continuously, Ni, Ti and Nb alloy powders diffuse with each other. When the diffusion rate increases to a certain extent, it is too late to form an ordered structure and form a Ni–Ti–Nb amorphous alloy. The stress and displacement curves are obtained by testing the tensile strength at room temperature. The stress changes of the restrained curves are relatively stable when the displacement is 6–18 mm, and the stress changes of the unconstrained curves show a distinct upward trend when the displacement is 6–18 mm, indicating that the strength of the specimens treated with restraint is higher than that of the specimens treated with restraint. This is due to the high internal stress of the material caused by the restraint and the decrease in the tensile strength of the alloy material.

Reactive Al-Li Powders Prepared by Mechanical Alloying

2005 ◽  
Vol 896 ◽  
Author(s):  
Xiaoying Zhu ◽  
Mirko Schoenitz ◽  
Vern K. Hoffmann ◽  
Edward L. Dreizin
Keyword(s):  
Mechanical Alloying ◽  
Amorphous Material ◽  
Relaxation Processes ◽  
X Ray Diffraction ◽  
Mechanically Alloyed ◽  
Exothermic Reactions ◽  
X Ray ◽  
Δ Phase ◽  
Endothermic Reactions ◽  
Synthesized Materials

AbstractMechanically alloyed powders with the composition Al0.7Li0.3 are synthesized. Materials milled for different times are studied using electron microscopy, x-ray diffraction, and thermal analysis. A solid solution of Li in Al (α-phase) is formed with as much as 10 at % of dissolved Li. The LiAl intermetallic δ-phase is readily produced by mechanical alloying but disappears after extended milling times. The final product of milling for 102 hours consists of an x-ray amorphous phase. Mechanically alloyed powders heated in inert environment exhibit several weak exothermic reactions between 420 and 700 K, and two endothermic reactions, around 810 and 870 K. All the observed relaxation processes become less pronounced and eventually become undetectable as the milling time increases and an amorphous material is produced. Ignition experiments performed for the powders coated on an electrically heated filament showed that the powders ignited in the vicinity of 1250 K. An experimental setup for studying combustion of reactive mechanically alloyed powders is developed and initial experimental results are described.

scholarly journals Formation of nanocrystalline B2-structured (Fe,Ni)Al in mechanically alloyed Fe50Al30Ni20 (wt.%) powder

2018 ◽  
pp. 66
Author(s):  
Nakib Chafika
Keyword(s):  
Dislocation Density ◽  
Mechanical Alloying ◽  
Room Temperature ◽  
X Ray Diffraction ◽  
Mechanically Alloyed ◽  
Sem Images ◽  
X Ray ◽  
Paramagnetic Behaviour ◽  
Powder Particles ◽  
Bcc Phase

B2-structured (Fe,Ni)Al was synthesised by an abrupt reaction during mechanical alloying (MA) of the elemental powders of Fe, Al and Ni. The structural, microstructural, morphological and magnetic changes occurring in the studied material during MA were investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Two crystalline phases were found, a majority one corresponding to (Fe,Ni)Al bcc phase with a crystallite size less than 10 nm, a lattice strain up to 1.6% and a dislocation density of about 2.3 x1016 m-2. The other phase was in a low proportion corresponding to Fe (Al,Ni) solid solution. SEM images showed an irregular morphology of powder particles. Mossbauer spectra of the milled powders, recorded at room temperature, reveal the paramagnetic behaviour of the obtained powder. Keywords: Mechanical alloying, ternary composition, dislocation density, structural properties, paramagnetic behaviour.

Synthesis and Evaluations of Microstructure Properties on Al-(50, 60, 70 mass%)Si Systems by Mechanical Alloying

2004 ◽  
Vol 449-452 ◽  
pp. 249-252 ◽  
Author(s):  
Jung Il Lee ◽  
Tae Whan Hong ◽  
Il Ho Kim ◽  
Soon Chul Ur ◽  
Young Geun Lee ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Mechanical Alloying ◽  
Milling Time ◽  
Alloy System ◽  
Misfit Strain ◽  
X Ray Diffraction ◽  
Mechanically Alloyed ◽  
X Ray ◽  
Transmission Electron ◽  
Nanocrystalline Structures

High silicon Al-Si alloy powders having nanocrystalline structures have been produced by mechanical alloying process. Microstructures in mechanically alloyed Al-Si powders were investigated by scanning electron microscopy and transmission electron microscopy. X-ray diffraction analyses were also carried out to characterize lattice constant, crystallite size and misfit strain. Effective milling time for the formation of nanocrystalline microstructure was thought to be approximately 12 hours, and the sizes of Al and Si crystallites in mechanically alloyed powders after longer than 12 hours of milling were reduced to about 30nm and 70nm respectively, in Al-70 mass% Si alloy system. The misfit strains increased with milling time up to 240 hours, and saturated to 5.73×10-3 and 4.39×10-3 for Al and Si crystallites, respectively.

scholarly journals Iron-based intermetallic particles formation in Al-Zn-Si alloy through powder metallurgy route

2021 ◽  
Vol 8 (12) ◽  
pp. 36-42
Author(s):  
Khaliq et al. ◽  
Keyword(s):  
Powder Metallurgy ◽  
Mechanical Alloying ◽  
Ball Milling ◽  
X Ray Diffraction ◽  
Mechanically Alloyed ◽  
Cold Pressing ◽  
X Ray ◽  
Steel Strips ◽  
Intermetallic Particles ◽  
Powder Metallurgy Route

Corrosion of the steel products is one of the significant challenges which is managed by coating with Al-Zn-based alloys. The Galvalume alloy (Al-55%, 43.5%-Zn, Si-1.5%) is coated on steel strips via a hot-dipping process. The dissolution of iron (Fe) from steel strips and the formation of Fe-based intermetallic particles is an inevitable phenomenon during the hot-dip coating process. These intermetallic particles are a primary source of massive bottom dross build-up in the coating pot and metal spot defects in the coated steel products. Therefore, it is important to investigate the formation of Fe-based intermetallic particles. In this study, Fe-based intermetallic particles are produced via the powder metallurgy route. High energy ball milling was used for mechanical alloying of aluminum (Al), iron (Fe), silicon (Si), and zinc (Zn) powders. Optimized ball milling conditions were identified after a series of trials. After cold pressing, the mechanically alloyed samples (pellets) were sintered at various conditions in a high vacuum sintering furnace. The X-ray diffraction (XRD) and scanning electron microscope (SEM) equipped with energy-dispersive X-ray diffraction (EDS) were used for the analysis of raw material, mechanically alloyed powders, and sintered pellets. It is concluded that the mechanical alloying of 6h and cold pressing at 9 tons for 30 min is sufficient to produce a dense compact material. It was found that Fe-based intermetallic particles were successfully fabricated which were α-AlFeSi. However, intermetallic particles similar to those found in the bottom dross of the coating pot are difficult to fabricate through the powder metallurgy route due to the volatilization of Zn during the sintering process.

Investigation the Structural and Magnetic Properties of FINEMET Type Alloy Produced by Mechanical Alloying

2014 ◽  
Vol 970 ◽  
pp. 252-255 ◽  
Author(s):  
Tayebeh Gheiratmand ◽  
Saeed Mohammadi Siyani ◽  
Hamid Reza Madaah Hosseini ◽  
Parviz Davami
Keyword(s):  
Electron Microscopy ◽  
Solid Solution ◽  
Mechanical Alloying ◽  
Milled Powder ◽  
Main Peak ◽  
X Ray Diffraction ◽  
Type Alloy ◽  
Mechanically Alloyed ◽  
X Ray ◽  
Transmission Electron

In this research, FINEMET alloy with composition of Fe73.5Si13.5B9Nb3Cu1was produced by mechanical alloying from elemental powders. The effect of milling time on the magnetic and structural properties of alloy has been investigated using X-ray diffraction, scanning electron microscopy, transmission electron microscopy and vibrating sample magnetometery. The results showed that milling for 53 hr leads to the formation of Fe supersaturated solid solution which includes Si, B and Nb atoms with mean crystallite size of ~30 nm. The shift of the main peak of Fe to the higher angles indicated that Si and B atoms dissolve in the Fe solid solution, at primary stage of mechanical alloying, up to the 42 hr while Nb atoms dissolve at final stages. The magnetization of milled powder for 53 hr was 173.7 emu/g, almost the same as that of the melt-spun ribbon. In addition; the coercivity reached to 15.5 Oe after 53 hr of milling. The higher value of coercivity in mechanically alloyed samples is attributed to strains induce to the structure during milling and the lack of amorphous phase and exchange interaction between nanograins.

Structural Evolution of Mechanically Alloyed Nanocrystalline Al70Fe25Ni5 Intermetallics

2013 ◽  
Vol 275-277 ◽  
pp. 1751-1754
Author(s):  
Zhang Jing ◽  
Qi Zhi Cao ◽  
Zheng Liang Li
Keyword(s):  
Mechanical Alloying ◽  
Solid Solutions ◽  
Ball Mill ◽  
Structural Changes ◽  
Structural Evolution ◽  
High Energy ◽  
X Ray Diffraction ◽  
Mechanically Alloyed ◽  
X Ray ◽  
Scanning Electron

Nanostructured Al-25at.%Fe-5at.%Ni intermetallics were prepared directly by mechanical alloying (MA) in a high-energy planetary ball-mill. The phase transformations and structural changes occurring in the studied material during mechanical alloying were investigated by X-ray diffraction (XRD). Scanning electron microscopy (SEM) was employed to examine the morphology of the powders. Thermal behavior of the milled powders was examined by differential thermal analysis (DTA). The solid solutions of Fe (Al) and Ni (Fe) in the Al70Fe25Ni5 system are observed at the early milling stage. The solid solutions transforms into amorphous and disordered Al (Fe, Ni) phase. The last milling products in the Al70Fe25Ni5 system are Al3Ni2, AlFe3 and AlFe0.23Ni0.77 phases.

Crystallisation of Amorphous Al60Fe20Ti15Ni5 Alloy Produced by Mechanical Alloying

2010 ◽  
Vol 163 ◽  
pp. 243-246 ◽  
Author(s):  
Marek Krasnowski ◽  
Tadeusz Kulik
Keyword(s):  
Mechanical Alloying ◽  
Amorphous Phase ◽  
High Energy ◽  
Lattice Parameter ◽  
Cubic Phase ◽  
X Ray Diffraction ◽  
Mechanically Alloyed ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Elemental Powder Mixture

In the present work, an elemental powder mixture of Al60Fe20Ti15Ni5 (at.%) was mechanically alloyed in a high-energy ball mill. The phase transformations occurring in the material during milling were studied with the use of X-ray diffraction. The results obtained show that an amorphous phase was formed during performed mechanical alloying process. Thermal behaviour of the milling product was examined by differential scanning calorimetry. It was found that amorphous phase crystallised above 540 °C when a heating rate of 40 °C/min was applied. On the basis of X-ray diffraction results, crystallisation product was identified as a cubic phase with the lattice parameter a0 = 11.856 Å, isomorphic with the 2 (Al2FeTi, fcc structure D8a) phase. The mean crystallite size of the crystallised 2 phase was 19 nm.

Structural Evolution of Mechanically Alloyed Nanocrystalline Fe25Al50Ni25 Intermetallics

2012 ◽  
Vol 476-478 ◽  
pp. 1476-1479
Author(s):  
Qi Zhi Cao ◽  
Jing Zhang ◽  
Jian Ying Li
Keyword(s):  
Solid Solution ◽  
Mechanical Alloying ◽  
Ball Mill ◽  
Structural Changes ◽  
Structural Evolution ◽  
High Energy ◽  
X Ray Diffraction ◽  
Mechanically Alloyed ◽  
X Ray ◽  
Unknown Phase

Nanostructured Fe25Al50Ni25intermetallics was prepared directly by mechanical alloying (MA) in a high-energy planetary ball-mill. The phase transformations and structural changes occurring in the studied material during mechanical alloying were investigated by X-ray diffraction (XRD). Thermal behavior of the milled powders was examined by differential thermal analysis (DTA). Disordered Al(Fe,Ni) solid solution was formed After 50 h of milling. Al(Fe,Ni) solid solution milled for 100h transformed into FeNi,FeNi3 and AlNi3 phase. The power annealed at temperature 500 results in forming of intermetallics AlFe0.23Ni0.77, Al1.1Ni0.9 , AlNi and two unknown phase after 5h milling. The nanocrystalline metallic compound was obtained after 100h milling.

Chemical Redistribution and Microstructural Evolution of ODS Fe-Cr Powders During Mechanical Alloying

2018 ◽  
Vol 69 (2) ◽  
pp. 495-498
Author(s):  
Madalina Stanciulescu ◽  
Marioara Abrudeanu ◽  
Catalin Ducu ◽  
Adriana Gabriela Plaiasu
Keyword(s):  
Mechanical Alloying ◽  
Oxide Dispersion Strengthened ◽  
Xrd Analysis ◽  
Alloy Formation ◽  
Oxide Dispersion ◽  
X Ray Diffraction ◽  
Mechanically Alloyed ◽  
Solid Solution Formation ◽  
X Ray ◽  
Solution Formation

The oxide dispersion strengthened ferritic steel powders with chemical composition of Fe-14Cr-3W-0.3Y2O3 were mechanically alloyed from elemental powders in a planetary ball mill. Microstructural and chemical changes at different milling times were investigated by electron microscopy (SEM-EDS) and X-ray diffraction analysis (XRD). It was observed that morphology and structure of powders have experienced many stages during milling, and a quantitative mechanism was proposed. The initiation and evolution of the alloy formation started somewhere around 32 h of mechanical alloying (MA). According to microscopy and XRD analysis, in the first MA stages, milling chiefly has resulted in severe plastic deformation and grain refinement of powders, while in the later stages, alloying was progressed. It seems that 32 hours of milling are necessary to initiate the alloying process of Fe with Cr, but 78 h are not sufficient for completely dissolving W into �-Fe matrix retarding the Fe-Cr-W solid solution formation.

Solid State Amorphization of a Ni-B Alloy by Mechanical Alloying

1990 ◽  
Vol 205 ◽  
Author(s):  
T. Nasu ◽  
C.C. Koch ◽  
K. Nagaoka ◽  
M. Sakurai ◽  
K. Suzuki
Keyword(s):  
Solid State ◽  
Mechanical Alloying ◽  
Alloy Powder ◽  
Milling Time ◽  
Milling Machine ◽  
Long Range Order ◽  
X Ray Diffraction ◽  
Mechanically Alloyed ◽  
X Ray ◽  
State Amorphization

AbstractThe main purpose of this work was to investigate the possibility of solid state amorphization of Ni-B crystal powder. A Ni-B alloy powder was obtained by mechanical alloying of Ni and B powder using a conventional ball milling machine. X-ray diffraction and EXAFS measurements were made for the mechanically alloyed samples as a function of milling time. An amorphization reaction was observed in Ni64B36 at 400 h of milling time. The long range order of the crystalline Ni phase diminished with an increase of solution of B into the Ni matrix. This suggests that the solution of B atoms into the Ni crystalline phase, forced by mechanical alloying, plays an important role in the crystalamorphous transformation.

Sign in / Sign up

Export Citation Format

Share Document