Effect of impurities on the weldability of powder metallurgy, electron-beam melted and arc-melted molybdenum and its alloys

Morito, F.

doi:10.1007/bf01139072

Cited by 15 publications

(4 citation statements)

References 13 publications

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“…Some researchers try to find a new alloy series, such as TZM [17,18], but it still seems not good enough. Accordingly, the forge technique is modified in this paper to change the microstructure of molybdenum bars, and as seen from Table 1, this method is quite promising.…”

Section: Transverse Ductility Performance At Different Annealing Tempmentioning

confidence: 98%

“…Another point should be marked is that, to improve the transverse ductility of pure molybdenum bars, one method is to reduce the impurity content, namely to develop high-purity molybdenum to increase the grain boundary strength [17], however, its improvement is not so remarkable. Some researchers try to find a new alloy series, such as TZM [17,18], but it still seems not good enough.…”

Section: Transverse Ductility Performance At Different Annealing Tempmentioning

confidence: 99%

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The annealing characteristics of pure molybdenum bars manufactured by a modified technique

Wang¹,

Guo²,

Cao³

et al. 2008

Journal of Alloys and Compounds

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Section: Transverse Ductility Performance At Different Annealing Tempmentioning

confidence: 98%

Section: Transverse Ductility Performance At Different Annealing Tempmentioning

confidence: 99%

The annealing characteristics of pure molybdenum bars manufactured by a modified technique

Wang¹,

Guo²,

Cao³

et al. 2008

Journal of Alloys and Compounds

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“…In the case of joining, both electron beam welding [39][40][41] and friction welding [41 ] of Mo alloys (Mo, TZM, Mo-Nb) have been performed. The effects of impurity contents and their segregation at grain boundaries upon the properties of joints have been examined.…”

Section: Molybdenum *Tomentioning

confidence: 99%

Recent Advances and Developments in Refractory Alloys

Nieh

Wadsworth

1993

MRS Proc.

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Refractory metal alloys based on Mo, W, Re, Ta, and Nb (Cb) find applications in a wide range of aerospace applications because of their high melting points and high-temperature strength. In this paper, we present recent progress in the understanding and applications of these alloys. Recent studies to improve the oxidation and mechanical behavior of refractory metal alloys, and particularly Nb alloys, will also be discussed. Some Re structures, for extremely high temperature applications (> 2000°C), made by CVD and P/M processes, are also illustrated. Interesting work on the development of new W alloys (W-HfC-X) and the characterization of some commercial refractory metals, e.g., K-doped W, TZM, and Nb-l%Zr, continues. Finally, recent developments in high temperature composites reinforced with refractory metal filaments, and refractory metal-based intermetallics, e.g., Nb3A1, Nb2Be17, and MoSi2, are briefly described.

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“…In [8], it was shown that the work of fracture is the function of the O segregation level at the grain boundary. Furthermore, it is worth mentioning that embrittlement at room temperature occurs at a relatively low O content, lying at around several dozens of ppm [8,15]. Auger electron spectroscopy [8] and atom probe tomography [16] reveal that oxygen segregates significantly on the grain boundary.…”

Section: Introductionmentioning

confidence: 99%

Effect of Oxygen in Mo-TM (TM = Ti, Zr, Hf) Solid Solutions as Studied with Density Functional Theory Calculations

Touzani,

Nizinkovskyi,

Krüger

2024

Crystals

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Mo-Ti-Si, Mo-Zr-B, and Mo-Hf-B are promising alloy systems for high-temperature applications as they show higher toughness and higher creep resistance than other Mo-based alloys. Regarding ductility and toughness, the chemical composition of the Mo solid-solution phase is the main parameter with which to tweak these properties of multiphase Mo-based alloys. Besides the common solid-solution hardening, one goal is to minimize embrittlement by decreasing the detrimental effects of interstitials like oxygen atoms in Mo alloys, which might be present in the bulk material due to trapping. For a better understanding of the trapping mechanisms and behavior of Mo solid solutions, the bonding situation and interaction of Mo atoms with the atoms of the alloying partners, as well as oxygen atoms, is worthwhile to investigate. For this, an in-depth analysis of the chemical bonding situation with calculations based on density functional theory in selected Mo-TM(-O) (TM = Ti, Zr, Hf) solid solutions is conducted in this work. It is shown that Ti atoms in a Mo solid solution are strong traps for oxygen atoms, while Hf and, even more clearly, Zr atoms are not. It is pointed out that the ionic and covalent interactions are the primary influence on the trapping behavior, as the change in ionic and covalent interactions between trapping and nontrapping models follows the trend Mo-1Ti > Mo-1Hf > Mo-1Zr, which resembles the trend of the trapping energy.

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Effect of impurities on the weldability of powder metallurgy, electron-beam melted and arc-melted molybdenum and its alloys

Cited by 15 publications

References 13 publications

The annealing characteristics of pure molybdenum bars manufactured by a modified technique

The annealing characteristics of pure molybdenum bars manufactured by a modified technique

Recent Advances and Developments in Refractory Alloys

Effect of Oxygen in Mo-TM (TM = Ti, Zr, Hf) Solid Solutions as Studied with Density Functional Theory Calculations

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