Nanocrystalline TiAl powders synthesized by high-energy ball milling: effects of milling parameters on yield and contamination

Bhattacharya, P.; Bellon, Pascal; Averback, Robert S; Hales, Stephen J.

doi:10.1016/j.jallcom.2003.08.079

Cited by 73 publications

(32 citation statements)

References 18 publications

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“…The latter effect could be explained by the high density of defects introduced by the intense plastic deformation associated with milling and also by the decrease of grain size. The former one was already noted by Bhattacharya [28] in the case of Tie46Ale 4.0(Cr,Nb,Ta,B). These authors concluded that deformation favors a structure to the detriment of g one.…”

Section: Microstructure Of Initial Powderssupporting

confidence: 52%

Effect of powder state on spark plasma sintering of TiAl alloys

et al. 2013

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Section: Microstructure Of Initial Powderssupporting

confidence: 52%

Effect of powder state on spark plasma sintering of TiAl alloys

et al. 2013

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“…Previous studies have also addressed the delay in the alloying process using different types of PCA. [15,18,24] In the present study, no alloying could be observed when the MA was processed with 3 pct SA or EBS for 5 hours, as shown in Figures 1(c) and (f). This fact is due to the reduction in surface tension of the solid materials by absorption of the PCA, leading to a lower degree of cold welding.…”

Section: B Morphological and Microstructural Characteristics Of Ballmentioning

confidence: 38%

Study on the Role of Stearic Acid and Ethylene-bis-stearamide on the Mechanical Alloying of a Biomedical Titanium Based Alloy

Nouri

Hodgson

Wen

2010

Metall Mater Trans A

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The present study examines the influence of different contents and types of process control agent (PCA), i.e., stearic acid (SA) and ethylene-bis-stearamide (EBS), on the microstructural evolution and characteristics of Ti-16Sn-4Nb (wt pct) alloy powders and bulk samples. The characterization of the powders and bulk samples was carried out by using chemical analysis, optical microscopy, scanning electron microscopy (SEM) combined with energy-dispersive spectrometry (EDS), and X-ray diffractometry. Results indicated that the powder recovered from the ball milling containers increased with increasing amounts of SA and EBS. Furthermore, adding more SA or EBS to the powder mixture resulted in a considerably smaller particle size, with a flaky-shaped morphology for the given ball milling time. Also, a slightly higher effectiveness was found for EBS when compared to SA. Meanwhile, the addition of both SA and EBS led to a delay in the alloy formation during mechanical alloying (MA) and caused contamination of the material with mainly carbon (C) and oxygen (O). An optimum amount of 1 wt pct PCA led to a good balance between cold welding and fracturing, and thus favored the formation of the titanium alloy. The microstructural observation of the bulk alloy showed a homogeneous distribution of fine Nb-rich b-phase colonies within the a-Ti matrix with the addition of PCA less than 1 wt pct.

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“…Among intermetallic compounds, the titanium aluminide compounds (Ti 3 Al, TiAl and TiAl 3 ) are attractive candidate materials for aerospace structure and engine applications [5]. The advantages of these materials are their low density, high specific strength, and relatively good properties at elevated temperatures and high creep resistance [6,7].…”

Section: Introductionmentioning

confidence: 99%

Self-Consolidation and Surface Modification of Mechanical Alloyed Ti-25.0 at.% Al Powder Mixture by Using an Electro-Discharge Technique

Chang¹,

Jang²,

Yoon³

et al. 2017

Archives of Metallurgy and Materials

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Electrical discharges using a capacitance of 450 μF at 0.5, 1.0, and 1.5 kJ input energies were applied in a N 2 atmosphere to obtain the mechanical alloyed Ti 3 Al powder without applying any external pressure. A solid bulk of nanostructured Ti 3 Al was obtained as short as 160 μsec by the Electrical discharge. At the same time, the surface has been modified into the form of Ti and Al nitrides due to the diffusion process of nitrogen to the surface. The input energy was found to be the most important parameter to affect the formation of a solid core and surface chemistry of the compact.

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Nanocrystalline TiAl powders synthesized by high-energy ball milling: effects of milling parameters on yield and contamination

Cited by 73 publications

References 18 publications

Effect of powder state on spark plasma sintering of TiAl alloys

Effect of powder state on spark plasma sintering of TiAl alloys

Study on the Role of Stearic Acid and Ethylene-bis-stearamide on the Mechanical Alloying of a Biomedical Titanium Based Alloy

Self-Consolidation and Surface Modification of Mechanical Alloyed Ti-25.0 at.% Al Powder Mixture by Using an Electro-Discharge Technique

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