Structure and Mechanical Properties of the Hot Pressed Compact of Ti-rich TiAl Powder Produced by the Plasma Rotating Electrode Process.

Tokizane, Masaharu; Fukami, Toshisuke; Inaba, Teruhiko

doi:10.2355/isijinternational.31.1088

Cited by 21 publications

(4 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, the simplicity of hydrogenation makes this process contamination-free and less costly compared to competitive processes such as an aluminothermic reduction method, [18] a gas atomization process, and a plasma rotating electrode process. [19] However, the mechanism of hydrogen-induced pulverization is not well understood, and the available literature concerning the hydrogenation of pure Nb is limited to articles about fundamental features of hydride formation, as exemplified in the Nb-H phase diagram (Figure 1), [20][21][22][23] and hydrogen embrittlement. [24,25,26] To apply a powder fabrication process by hydrogenation to pure Nb, it is necessary to better understand the mechanism of hydrogen-induced pulverization from metallographic points of view.…”

Section: Introductionmentioning

confidence: 99%

Fracture behavior of niobium by hydrogenation and its application for fine powder fabrication

Semboshi

Masahashi

Konno

et al. 2006

Metall Mater Trans A

View full text Add to dashboard Cite

Fracture behavior of pure niobium (Nb) by several hydrogenation procedures has been investigated to elucidate the fundamental mechanisms of hydrogen pulverization, which can then be used to produce fine Nb powders with high purity. Concentric cracks and microcracks were introduced in recrystallized Nb specimens, leading to pulverization, when they absorb hydrogen enough to form a large volume of the face-centered orthorhombic ␤-NbH phase. This hydride phase exhibits anisotropic expansion of Nb lattice and embrittlement. Thus, the fracture of Nb plates occurs in the following sequence: hydrogen absorption, the formation of the ordered hydride phase, strain generation arising from the phase transformation, and crack nucleation and propagation. The authors also show that Nb powders less than 1 m were prepared by hydrogenation and ball-milling at a temperature below 203 K, in which hydrogen was removed by dehydrogenation at above 724 K. Thus, fine and contamination-free Nb powders can be effectively fabricated by using hydrogenation, ball-milling, and dehydrogenation procedures.

show abstract

Section: Introductionmentioning

confidence: 99%

Fracture behavior of niobium by hydrogenation and its application for fine powder fabrication

Semboshi

Masahashi

Konno

et al. 2006

Metall Mater Trans A

View full text Add to dashboard Cite

show abstract

“…The chemical composition of the starting material β-CEZ Ti alloy [10] is given in Table 1. Powders were prepared at Ritsumeikan University -Japan [11]. They were obtained from the rod by a plasma Rotating Electrode Process (PREP) and had an average particle size of 150 μm.…”

Section: Introductionmentioning

confidence: 99%

Study of harmonic microstructure development during Spark Plasma Sintering (SPS) of β-CEZ titanium alloy

et al. 2020

View full text Add to dashboard Cite

The present study focuses on the formation of harmonic microstructures in a metastable β titanium alloy, the β-Cez alloy (Tβ =890°C). Previous studies showed that harmonic structures obtained by a powder metallurgy route led to an increase in mechanical properties. In this study, the harmonic structure was obtained after a Mechanical Milling of the Initial Powder followed by Spark Plasma Sintering. The phase transformations occurring in the Initial Powder and Mechanical Milled powders during a heat treatment similar to the SPS one were studied. Electrical resistivity, high energy XRD and SEM-EBSD were used to characterize the evolution of phases and microstructures and highlight the effect of the thermal treatment and the milling. It was shown that after thermal treatment of Mechanical Milled powders, a harmonic α + β microstructure is obtained consisting of nodular α grains in the powder shell and α lamellae in the powder core. The stress/strain induced martensite formed during the milling associated with the heavier deformation at the powder surface areas contributes highly to the formation of network arrangement of nodular α grains by a recovery/recrystallization phenomenon of β and α phases during the heating.

show abstract

“…This process has been applied using TiAl powders produced by PREP and mechanical alloying. 1,2) The PREP is one of the production methods of rapidly solidified Ti base alloy powders. Characteristically, the obtained powder has uniform spherical shape and is rather free from impurity elements.…”

Section: Introductionmentioning

confidence: 99%

Superplasticity-like Behavior of Rapidly Solidified Ti-rich TiAl Powders and its Application to In-situ Sintering Bonding

et al. 2003

View full text Add to dashboard Cite

The application of rapidly solidified Ti-rich TiAl alloy powders to bonding technique has been proposed. The alloy powders are produced by plasma rotating electrode process (PREP). Among them, the powders (denoted as M powders) having surface relief of martensitic phase are used as an interlayer of the joint. The bonding of two Ti-50 mol%Al alloy disks was performed at 1273 K for 0.6 ks under 1.9 kN using the M powders of Ti-40 mol%Al alloy. Since the M powder shows superplasticity-like deformation, there are no defects such as void and oxide film in the bonding interface and the powders in the interlayer are indistinguishable. It is also confirmed that the bonding strength of the obtained joint increases notably by the use of the powder interlayer. Consequently, the bonding of the TiAl disks is achieved well by the excellent deformation behavior of the M powder even at relatively lower temperature and shorter holding time.

show abstract

Structure and Mechanical Properties of the Hot Pressed Compact of Ti-rich TiAl Powder Produced by the Plasma Rotating Electrode Process.

Abstract: The structure and the compressive mechanical properties of the Ti-rich TiAl (approximately

Cited by 21 publications

References 0 publications

Fracture behavior of niobium by hydrogenation and its application for fine powder fabrication

Fracture behavior of niobium by hydrogenation and its application for fine powder fabrication

Study of harmonic microstructure development during Spark Plasma Sintering (SPS) of β-CEZ titanium alloy

Superplasticity-like Behavior of Rapidly Solidified Ti-rich TiAl Powders and its Application to In-situ Sintering Bonding

Contact Info

Product

Resources

About