Improved Sintering Procedures for Aluminum P/M Parts

Dudas, J.; Thompson, Caroline

doi:10.1007/978-1-4615-8963-1_2

Cited by 24 publications

(12 citation statements)

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“…Dry N 2 is the most common atmosphere for sintering aluminium. [19][20][21][22][23][24][25][26] Vacuum is more effective than Ar and H 2 , which are detrimental to sintered density due to reduction in oxide and generation of H 2 O vapour at high temperatures resulting in pore generation. 22,23 The thermogravimetric analysis (TGA)-DSC curves for the investigated Al-6061 in N 2 and Ar are presented in Fig.…”

Section: Phase Transformationmentioning

confidence: 99%

Sintering behaviour of Al-6061 powder produced by rapid solidification process

et al. 2011

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Complex aluminium alloy components fabricated by powder metallurgy (P/M) offer the promise of a low cost and high strength-to-weight ratio, which meets the demands of the automotive sector. This paper describes the die compaction and sintering response of an atomised Al-6061 alloy powder containing Mg and Si produced by rapid solidification. A design of experiments is used involving three levels each of the die compaction pressure, sintering temperature, peak temperature hold time and heating rate. Three trials were used to obtain the optimum press sinter processing conditions. Besides the mechanical properties, phase transformation and microstructure are investigated. Supplemental insight is gained through thermogravimetric analysis, differential scanning calorimetry and SEM with energy dispersive spectroscopy. Analysis of variation is used to quantify the contribution of each design variables to the mechanical properties.

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Section: Phase Transformationmentioning

confidence: 99%

Sintering behaviour of Al-6061 powder produced by rapid solidification process

et al. 2011

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“…For this reason, its utilization should be maximized up to 5 and 10 wt.% for wrought alloys and cast alloys, respectively [28]. Moreover, it was documented that Mg vaporized during sintering, and the gas produced served as a reliable gettering agent for effective liquid phase sintering of Al [14,26,[29][30]. Therefore, it has been proposed that the application of nitrogen (Ni) as a sintering atmosphere was effective in transporting Mg vapor (effective gettering agent) around the pore network via the formation of magnesium nitride (Mg 3 N 2 ) [29].…”

Section: Phases Transformation Of the Resultant Aluminum Alloysmentioning

confidence: 99%

Assisting Liquid Phase Sintering of Pure Aluminum (Al) by the Tin Addition

Jamal¹,

Yusof²,

Ahmad³

et al. 2022

Aluminium Alloys - Design and Development of Innovative Alloys, Manufacturing Processes and Applications

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In the present study, the addition of tin (Sn) to the pure Al system was done, and its effects on the morphology, density, and compressive yield strength of pure Al were analyzed systematically. In this context, the morphology of sintered Al revealed enhanced wettability and sintering response between Al particles with increased Sn content. Moreover, physical characteristics of sintered Al alloys demonstrated oxidation phenomenon (black color specimen) with the lowest Sn content of 1.5 weight percent (wt.%), in which a higher Sn content of 2 and 2.5 wt.% produced silver color specimens, implying a reduction in oxidation. Additionally, densification of sintered Al alloys was greatly promoted with increased Sn contents, suggesting effective wetting as confirmed by the previous morphological observations. Similarly, the compressive yield strength of sintered Al alloys improved with increased Sn content which might be due to the enhanced inter-particle contacts between Al particles and sufficient wetting by molten Sn. Based on the results obtained, the introduction of Sn powder at various contents improved the sintering response of pure Al powder by providing sufficient liquid-phase sintering. Therefore, the sintered Al alloys had enhanced the morphological, densification, physical characteristics, and compressive yield strength.

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“…Magnesium is known to react with the oxide and it therefore plays a major role in the sintering of aluminium [22][23][24][25][26]. The atmosphere is also known to be important and nitrogen is widely regarded as necessary [25,27,28]. A key feature in the beneficial use of nitrogen is the formation of aluminium nitride, which can occur because the interior region of the compact becomes essentially oxygen free through an autogenous gettering process [29].…”

Section: Introductionmentioning

confidence: 99%