Formation of Ni3Ta, Ni2Ta and NiTa by High-Energy Ball Milling and Subsequent Heat Treatment

2016 ◽  
Vol 869 ◽  
pp. 423-428
Author(s):  
Hanna Stefanni Nunes Benites ◽  
Bruna Pereira da Silva ◽  
Antonio Augusto Araújo Pinto da Silva ◽  
Belmira Benedita de Lima ◽  
Gilberto Carvalho Coelho ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Ball Milling ◽  
Weight Ratio ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Subsequent Heat Treatment ◽  
Mechanically Alloyed ◽  
Heat Treated ◽  
Energy Ball ◽  
Steel Balls

The present work reports on the formation of Ni3Ta, Ni2Ta and NiTa by high-energy ball milling and subsequent heat treatment. The elemental Ni-25Ta, Ni-33Ta and Ni-50Ta (at.-%) powder mixtures were ball milled under Ar atmosphere using stainless steel balls and vials as well as 300 rpm and a ball-to-powder weight ratio of 10:1. Following, the as-milled samples were uniaxially compacted and heat-treated under Ar atmosphere at 1100°C for 4h. The characterization of as-milled and heat-treated samples was conducted by means of X-ray diffraction, scanning electron microscopy, and energy dispersive spectrometry techniques. Supersaturated solid solutions were formed during ball milling of the Ni-25Ta, Ni-33Ta and Ni-50Ta powders. A large amount of Ni3Ta, Ni2Ta and NiTa was formed in the mechanically alloyed heat-treated Ni-25Ta, Ni-33Ta and Ni-50Ta alloys, respectively.

High-Energy Ball Milling and Subsequent Heat Treatment of Ti-Cu-Si-B Powders

2017 ◽  
Vol 899 ◽  
pp. 463-468
Author(s):  
Lucas Moreira Ferreira ◽  
Bruno Bacci Fernandes ◽  
Mario Ueda ◽  
Alfeu Saraiva Ramos
Keyword(s):  
Heat Treatment ◽  
Ball Milling ◽  
High Energy ◽  
Phase Region ◽  
High Energy Ball Milling ◽  
Subsequent Heat Treatment ◽  
Limited Information ◽  
Heat Treated ◽  
Structural Applications ◽  
Energy Ball

Metal matrix multicomponent alloys and others based on the Ti+Ti6Si2B phases are potentially attractive for structural applications. However, there is limited information in literature on the effect of alloying in stability of the Ti6Si2B compound, which presents its single-phase region close to Ti-22Si-11B alloy composition (at.-%). In this sense, this work discusses on the effect of copper addition on the stability of the Ti6Si2B compound. Elemental powder mixtures were used to prepare the Ti-xCu-22Si-11B (x=2 and 6 at.-%) alloys by high-energy ball milling and subsequent heat treatment (1100oC for 240 minutes). The as-milled Ti-Cu-Si-B powders and heat-treated samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive spectrometry (EDS). Similar behavior was noted during ball milling of Ti-Cu-Si-B powders, i.e., the Ti5Si3 phase was formed after milling for 180 minutes. The mechanically alloyed and heat treated Ti-2Cu-22Si-11B alloy presented a matrix of Ti6Si2B dissolving close to 2 at.-% Cu. Precipitates of Ti5Si3 and other unknown Cu-and Fe-rich phase were also identified in microstructures of these quaternary alloys, whose amounts were increased in the mechanical alloyed and heat treated Ti-6Cu-22Si-11B alloy.

Preparation of Nb–25Si, Nb–37.5Si, Nb–66.6Si powders by high-energy ball milling and subsequent heat treatment

2007 ◽  
Vol 434-435 ◽  
pp. 509-513 ◽  
Author(s):  
Bruno Bacci Fernandes ◽  
Erika Coaglia Trindade Ramos ◽  
Gilbert Silva ◽  
Alfeu Saraiva Ramos
Keyword(s):  
Heat Treatment ◽  
Ball Milling ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Subsequent Heat Treatment ◽  
Energy Ball

Preparation of Ti+Ti6Si2B powders by high-energy ball milling and subsequent heat treatment

2006 ◽  
Vol 14 (6) ◽  
pp. 585-591 ◽  
Author(s):  
Alexandro Nakano Silva ◽  
Gilbert Silva ◽  
Alfeu Saraiva Ramos ◽  
André Luís Paschoal ◽  
Erika Coaglia Trindade Ramos ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Ball Milling ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Subsequent Heat Treatment ◽  
Energy Ball

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.

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