Temperature induced porosity in hot isostatically pressed gamma titanium aluminide alloy powders

Wegmann, Gerhard; Gerling, R.; Schimansky, F.P.

doi:10.1016/s1359-6454(02)00465-2

Cited by 75 publications

(32 citation statements)

References 9 publications

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“…For example, after a thermal treatment for 4 h at 1390 C of HIP-compacted c-TiAl alloy powder, the largest pore which was observed had a diameter of 65 lm. [27] Although the argon entrapment can not be completely suppressed during atomization of TiAl-alloys, the aim must be to keep the Ar level as low as possible. A series of experiments has been conducted in the frame of which three differ- ent alloys were atomized by means of three different atomization techniques such as PIGA, EIGA and CA (Centrifugal Atomization).…”

Section: Argon In Atomized Powder Particlesmentioning

confidence: 99%

“…A series of experiments has been conducted in the frame of which three differ- ent alloys were atomized by means of three different atomization techniques such as PIGA, EIGA and CA (Centrifugal Atomization). [27] CA was conducted in an Ar atmosphere of normal pressure. The results of the argon analyses indicated the argon levels to vary significantly with the atomization technique but to be similar for different alloys if atomized with the same technique.…”

Section: Argon In Atomized Powder Particlesmentioning

confidence: 99%

“…A more detailed discussion of these results is provided in the literature. [27] Although the trapped argon concentrations are very low, inadequate processing parameters for PM products can cause noticeable porosity levels. Aspects for the minimization of an Ar-induced porosity will be discussed in chapter 3.…”

Section: Argon In Atomized Powder Particlesmentioning

confidence: 99%

“…During high temperarture heat treatments of compacts consisting of such alloy powder, the pore formation is even more pronounced when compared with the Ar-atomized powder. [25,27] Certain atomization techniques as REP can be conducted in vacuum. This would exclude an entrapment of inert gas.…”

Section: Argon In Atomized Powder Particlesmentioning

confidence: 99%

“…In such compacts light microscopy based porosity determina- tions therefore usually yield porosity levels £ 0.01 %. [27] Nevertheless, chemical analyses of the compacts indicate the presence of Ar gas at concentrations comparable to that trapped in the alloy powder particles used. After high temperature treatments of HIPed compacts, occasionally pores have been observed.…”

Section: Powder Consolidation By Hot-isostatic-pressingmentioning

confidence: 99%

See 4 more Smart Citations

Powder Metallurgical Processing of Intermetallic Gamma Titanium Aluminides

Gerling¹,

Clemens

Schimansky³

2004

Adv Eng Mater

198

155

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Intermetallic γ‐TiAl‐based alloys represent a new class of light‐weight structural materials for use at high temperatures. Because of their unique properties these alloys are considered for applications in aerospace and automotive industries. During the last decade both, alloy development and materials processing progressed significantly. New materials and powder metallurgy (PM) have formed a symbiosis since many decades. In fact, PM is an ancient technology which has been used for the processing for almost every metal or ceramic material. Therefore, it is hardly surprising that PM plays an important role in research and development of γ‐TiAl‐based alloys.

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Section: Argon In Atomized Powder Particlesmentioning

confidence: 99%

Section: Argon In Atomized Powder Particlesmentioning

confidence: 99%

Section: Argon In Atomized Powder Particlesmentioning

confidence: 99%

Section: Argon In Atomized Powder Particlesmentioning

confidence: 99%

Section: Powder Consolidation By Hot-isostatic-pressingmentioning

confidence: 99%

See 3 more Smart Citations

Powder Metallurgical Processing of Intermetallic Gamma Titanium Aluminides

Gerling¹,

Clemens

Schimansky³

2004

Adv Eng Mater

198

155

View full text Add to dashboard Cite

show abstract

Powder Metallurgy

2011

Gamma Titanium Aluminide Alloys

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Solid State Porous Metal Production: A Review of the Capabilities, Characteristics, and Challenges

et al. 2018

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Porous metals have been under development for nearly a century, but commercial adoption remains limited. This development has followed two primary routes: liquid state or solid state processing. Liquid state foaming introduces porosity to a liquid or semi‐solid metal, and solid state foaming introduces porosity to a metal, which is fully solid. Either method may create pores by internal gas pressure or introducing metal around a template directly control porosity. Process optimization and commercial output has been primarily related to liquid state methods, as solid state processing is often more complex, diverse, and with lower throughput. Solid state methods, however, are often more versatile and offer greater control of pore characteristics. Ongoing advancements in solid state foaming have allowed for a wide array of metals and alloys to be made porous and the three‐dimensional structure to be precisely tailored. In general, solid state processing remains limited to niche applications, often with modest dimensions (cm scale). “Traditional” solid state processes are being further refined and extended, and continuing developments to reduce cost, increase output, and control pore characteristics are likely to produce important advancements in coming years. The extensive variability of pore quantity and morphology makes solid state processes suitable, and often preferable, for an assortment of functional and structural applications, with electrodes and biomedical devices being among the most popular in current research. Various techniques for introducing porosity, the way these methods are applied, important considerations, typical outcomes, and current applications are reviewed.

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Temperature induced porosity in hot isostatically pressed gamma titanium aluminide alloy powders

Cited by 75 publications

References 9 publications

Powder Metallurgical Processing of Intermetallic Gamma Titanium Aluminides

Powder Metallurgical Processing of Intermetallic Gamma Titanium Aluminides

Powder Metallurgy

Solid State Porous Metal Production: A Review of the Capabilities, Characteristics, and Challenges

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