Temperature programmed desorption studies of outgassing of aluminium powder

Lalauze, René; Guillemin, I.; Pijolat, Christophe

doi:10.1007/bf02119266

Cited by 11 publications

(1 citation statement)

References 1 publication

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“…The peak in stage (b) agreed well with the temperature range provided in the literature for the release of chemisorbed water. [3,13,20] For comparison, the pressure-vs-time curve for the atomized Al-7.5Mg was also plotted in Figure 8(a). Note that the atomized Al-7.5Mg powder showed a much stronger release of both physisorbed and chemisorbed water when compared to the cryomilled Al-7.5Mg powder.…”

Section: Degassing Of Cryomilled Powdermentioning

confidence: 99%

Degassing Behavior of Nanostructured Al and Its Composites

Zhang

Dallek

Vogt

et al. 2009

Metall Mater Trans A

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The synthesis of bulk ultrafine-grained (UFG) and nanostructured Al via cryomilling can frequently require a degassing step prior to consolidation, partly due to the large surface area of the as-milled powders. The objective of this study is to investigate the effects associated with cryomilling with stearic acid additions (as a process-control agent) on the degassing behavior of Al powders. This objective was accomplished by completing select experiments with Al-7.5Mg, Al-6.4 wt pct Al 85 Ni 10 La 5 , and Al-14.3 wt pct B 4 C. The interaction between Al and stearic acid was determined using thermal analysis combined with Fourier transform infrared spectroscopy (FTIR). The degassing experiments were carried out under high vacuum (10 À4 to~10 À6 torr) in a range from room temperature to 400°C, with the pressure of the released gases monitored using a digital vacuum gage. The results showed that the liberation of chemisorbed water was suppressed in cryomilled Al powders and both the chemisorbed water and stearic acid were primarily released in the form of hydrogen. It was also demonstrated that under certain conditions, a nanostructure (grain size~100 nm) can be retained following the hot vacuum degassing of cryomilled Al.

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Section: Degassing Of Cryomilled Powdermentioning

confidence: 99%

Degassing Behavior of Nanostructured Al and Its Composites

Zhang

Dallek

Vogt

et al. 2009

Metall Mater Trans A

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Evolution of alloying elements during outgassing in an aluminium zinc magnesium alloy made by powder metallurgy

1988

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International audienceTo obtain high-quality produces from aluminium alloys powders, degassing is usually carried out before consolidation. But, in the case of Al-Zn-Mg alloys an evaporation of alloying elements may occur during outgassing. The aim of this work was to determine the influence of degassing conditions (temperature, pressure, nature of the gaseous atmosphere) on the stability of the alloy composition. These studies were performed on X7091 alloy by means of thermogravimetry and temperature-programmed desorption technique. The results show that liberation of alloying elements is closely connected with the evolution of the surface oxide layer which itself depends on various thermodynamic and kinetic parameters. The role of water vapour in the gaseous environment was particularly emphasized

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The presence and consequences of precipitatefree zones in an aluminium-copper-lithium alloy

Srivatsan¹,

Lavernia²

1991

J Mater Sci

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Temperature programmed desorption studies of outgassing of aluminium powder

Cited by 11 publications

References 1 publication

Degassing Behavior of Nanostructured Al and Its Composites

Degassing Behavior of Nanostructured Al and Its Composites

Evolution of alloying elements during outgassing in an aluminium zinc magnesium alloy made by powder metallurgy

The presence and consequences of precipitatefree zones in an aluminium-copper-lithium alloy

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