Structural Evolution of Ti-Fe-Si-B Alloys Produced by High-Energy Ball Milling and Sintering

2014 ◽  
Vol 802 ◽  
pp. 3-8
Author(s):  
Wladimir Leite Pereira ◽  
Isadora Rossi Bertoli ◽  
Juliana de Aquino Franzé ◽  
Alfeu Saraiva Ramos ◽  
Neide Aparecida Mariano ◽  
...  
Keyword(s):  
Ball Milling ◽  
Raw Materials ◽  
Structural Evolution ◽  
High Energy ◽  
Milling Process ◽  
High Energy Ball Milling ◽  
Powder Mixtures ◽  
Energy Ball ◽  
Sintered Alloys

This proposal aims at structural characterization of Ti-Fe-Si-B alloys produced by high-energy ball milling and subsequent sintering. In this study, quaternary alloys were prepared from raw materials of high purity: Ti (99.9 wt-%), Fe (99.8 wt-%), Si (99.999 wt-%) and B (99.5 wt-%). The milling process of the Ti-2Fe-22Si-11B and Ti-7Fe-22Si-11B (at-%) powders was carried out in a planetary Fritsch P-5 ball mill. Subsequently, the Ti-Fe-Si-B powders milled for 600 min were sintered (1100 ° C for 240 min) under vacuum to obtain equilibrium structures. The characterization of as-milled powders and sintered alloys was performed by means of X-ray diffraction, scanning electron microscopy, and electron dispersive spectrometry. Extended solid solutions were formed during the initial milling times while that the brittle Ti5Si3 phase was formed for longer milling times in both the quaternary powder mixtures. This fact contributed for reducing the particle sizes. Homogeneous samples containing a small amount of pore were obtained after sintering at 1100°C for 4h. Results have indicated that the iron addition favored the formation of different binary phases of the Ti-Si system, and the formation of the Ti6Si2B compound was inhibited from the Ti-Fe-Si-B powder mixtures.

scholarly journals Effect Of Different Mechanical Milling Processes On Morphology And Microstructural Changes Of Nano And Micron Al-Powders

2015 ◽  
Vol 60 (2) ◽  
pp. 1235-1239 ◽  
Author(s):  
H.-S. Kim ◽  
B. Madavali ◽  
T.-J. Eom ◽  
C.-M. Kim ◽  
J.-M. Koo ◽  
...  
Keyword(s):  
Ball Milling ◽  
Mechanical Milling ◽  
Structural Changes ◽  
Structural Evolution ◽  
High Energy ◽  
Milling Process ◽  
High Energy Ball Milling ◽  
Microstructural Changes ◽  
Al Nanoparticles ◽  
Energy Ball

Abstract In this research, effect of the various mechanical milling process on morphology and microstructural changes of nano and micron Al-powders was studied. The milling of Al-powders was performed by both high energy and low energy ball milling process. The influence of milling (pulverizing) energy on the structural changes of Al-powders was studied. Al-nanoparticles were agglomerated during the MA and its size was increased with increasing milling while micron Al-powder gets flattened shape during high energy ball milling due to severe plastic deformation. Meanwhile, structural evolution during high energy ball milling of the nano powder occurred faster than that of the micron powder. A slight shift in the position of X-ray diffraction peaks was observed in nano Al-powders but it was un-altered in macro Al-powders. The variation in lattice parameters was observed only for nano Al powders during the high energy ball milling due to lattice distortion.

High-Energy Ball Milling and Hot Pressing of the Ni-48Ti-2Sn and Ni-45Ti-5Sn Powder Mixtures

2014 ◽  
Vol 802 ◽  
pp. 29-34
Author(s):  
Leandro Koji Kayano ◽  
Daniel Murusawa ◽  
Gilda Maria Cortez Pereira ◽  
Alfeu Saraiva Ramos
Keyword(s):  
Ball Milling ◽  
Hot Pressing ◽  
Weight Ratio ◽  
High Energy ◽  
Milling Process ◽  
High Energy Ball Milling ◽  
Wet Milling ◽  
Powder Mixtures ◽  
Energy Ball ◽  
Steel Balls

This work presents the results on the high-energy ball milling and hot pressing of Ni-48Ti-2Sn and Ni-45Ti-5Sn (at-%) powder mixtures. The milling process was performed in a planetary ball mill using stainless steel vial (225 mL) and hardened steel balls (19 mm diameter), rotary speed of 300 rpm, and a ball-to-powder weight ratio of 10:1. Samples were collected into the vial after different milling times: 60, 180 and 300 min. In the sequence, wet milling (isopropyl alcohol) was adopted up to 720 min in order to increase the powder yield into the vials. The as-milled and hot-pressed samples were characterized by X-ray diffraction, electron scanning microscopy, and energy dispersive spectrometry. Results indicated that the ductile particles were promptly cold-welded during the initial milling times. XRD patterns of the Ni-48Ti-2Sn powder mixture indicated that the peaks of Ni, Ti and Sn disappeared after milling for 3h. Following, peaks of NiTi and Ni4Ti3were preferentially formed during milling of Ni-Ti-Sn powders. A large amount of fine powders was yielded into the vial after wet milling for 720 min only. No significant carbon or oxygen contamination was detected by EDS analysis. Hot pressing produced homogeneous and dense samples which presented microstructures containing a large amount of the NiTi compound.

Structural Evolution of FeAl3 Intermetallic during High-Energy Ball-Milling

2013 ◽  
Vol 755 ◽  
pp. 133-138 ◽  
Author(s):  
J. Luis López-Miranda ◽  
J.R. Romero-Romero ◽  
R. Esparza ◽  
G. Rosas
Keyword(s):  
Ball Milling ◽  
Cast Alloy ◽  
Structural Evolution ◽  
High Energy ◽  
High Energy Ball Milling ◽  
High Symmetry ◽  
Casting Technique ◽  
Conventional Casting ◽  
Energy Ball

In this work, we reported the results obtained by the structural characterization of the FeAl3 intermetallic compound. This material was synthesized by conventional casting technique using Fe (99.97%) and Al (99.92%) elemental metals. Then, the as-cast alloy was subjected to high-energy ball-milling for different times (1, 2.5, 5, 7.5, 10 and 15 h). The characterization of the alloy was performed by X-ray diffraction patterns, scanning and transmission electron microscopy. The results show that FeAl3 intermetallic was produced as a single-phase after conventional casting. The milled experiments show that the FeAl3 (monoclinic) transforms to Fe2Al5 (orthorhombic) after 15h of milling. Therefore, this phase transformation is characterized by a change from low to high symmetry systems.

Synthesis, sintering and characterization of PNZST ceramics from high-energy ball milling process

2008 ◽  
Vol 34 (4) ◽  
pp. 709-713 ◽  
Author(s):  
Lin Zhang ◽  
Zhuo Xu ◽  
Yujun Feng ◽  
Yuanyuan Hu ◽  
Xi Yao
Keyword(s):  
Ball Milling ◽  
High Energy ◽  
Milling Process ◽  
High Energy Ball Milling ◽  
Ball Milling Process ◽  
Energy Ball

An Investigation on the Mechanical Alloying of TiFe Compound by High-Energy Ball Milling

2010 ◽  
Vol 660-661 ◽  
pp. 329-334 ◽  
Author(s):  
Railson Bolsoni Falcão ◽  
Edgar Djalma Campos Carneiro Dammann ◽  
Cláudio José da Rocha ◽  
Ricardo Mendes Leal Neto
Keyword(s):  
Ball Milling ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Powder Mixtures ◽  
Milling Parameters ◽  
Process Route ◽  
Partial Formation ◽  
Energy Ball

This work reports the efforts to obtain TiFe intermetallic compound by high-energy ball milling of Ti and Fe powder mixtures. This process route has been used to provide a better hydrogen intake in this compound. Milling was carried out in a SPEX mill at different times. Strong adherence of material at the vial walls was seen to be the main problem at milling times higher than 1 hour. Attempts to solve this problem were accomplished by adding different process control agents, like ethanol, stearic acid, low density polyethylene, benzene and cyclohexane at variable quantities and keeping constant other milling parameters like ball to powder ration and balls size. Better results were attained with benzene and cyclohexane, but with partial formation of TiFe compound even after a heat treatment (annealing) of the milled samples.

Synthesis and Characterization of CNT Reinforced AA4032 Nanocomposites by High Energy Ball Milling

2010 ◽  
Author(s):  
M. S. Senthil Saravanan ◽  
K. Sivaprasad ◽  
S. P. Kumaresh Babu ◽  
P. Susila ◽  
B. S. Murty ◽  
...  
Keyword(s):  
Ball Milling ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Synthesis And Characterization ◽  
Energy Ball
Sign in / Sign up

Export Citation Format

Share Document