EFFECTS OF IRON AND NICKEL ON THE PROCESSING AND PERFORMANCE OF AN EMERGING ALUMINUM-COPPER-MAGNESIUM POWDER METALLURGY ALLOY
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Notice bibliographique
Résumé
Aluminum (Al) powder metallurgy (PM) provides a cost effective and environmentally\nfriendly means of creating lightweight, high performance, near net shape components,\nrelative to conventional casting/die casting technology. Unfortunately, the current lack of\ncommercially available Al alloy powder blends has hindered development in this field as\na result of the limited scope of mechanical properties available; especially under elevated\ntemperature conditions common to many automotive applications. As such, the objective\nof this research was to attempt to improve the versatility of current Al PM technology\nthrough the incorporation of Fe and Ni transition metal additions into an emerging Al-\n4.4Cu-1.5Mg-0.2Sn alloy, as this technique is known to enhance the elevated temperature\nstability of wrought/cast Al alloys through the formation of stable, Fe/Ni aluminide\ndispersoids.\nInitial experimentation consisted of evaluating the feasibility of incorporating Fe and Ni\nboth elementally and pre-alloyed, through a series of tests related to their PM processing\nbehaviour (compressibility, sintering response) and sintered product performance\n(ambient tensile properties). Results confirmed that pre-alloying of the base Al powder\nwas the most effective means of incorporating Fe and Ni as all such specimens achieved\nproperties similar or slightly superior to the unmodified alloy. Of the pre-alloyed systems\nconsidered, that containing 1%Fe+1%Ni displayed the most desirable results in terms of\nmechanical performance and microstructural homogeneity of the Fe/Ni dispersoid phases\npresent in the sintered product.\nBars of the baseline system and that modified with pre-alloyed additions of 1Fe/1Ni were\nthen sintered industrially to gain a preliminary sense of commercial viability and obtain\nadditional specimens for elevated temperature exposure tests. Results confirmed that the\nsintering response, tensile properties and microstructures were essentially identical in\nboth alloys whether they were sintered in a controlled laboratory setting or an industrial\nproduction environment. Furthermore, DSC data indicated that S (Al2CuMg)-type phases\nwere the dominant precipitates formed during heat treatment. The effects of elevated\ntemperature exposure were assessed in the final stage of research. Both alloys were\nfound to exhibit comparable behaviour when exposed to the lowest (120°C) and highest\n(280°C) temperatures considered. Here, the alloys showed no obvious degradation at\n120°C. Conversely, exposure at 280°C prompted a steady decline in yield strength for\nboth alloys with significant precipitate coarsening noted as well. Despite these\nsimilarities, differences emerged during isochronal tests at intermediate temperatures.\nHere, DSC data indicated that the precipitates present in the pre-alloyed material were\nstable at temperatures up to 160°C while those in the unmodified alloy had begun to\noverage under the same exposure conditions. These differences were accompanied by\nincreased stability in tensile yield strength for the pre-alloyed material. In all, this study\nhas indicated that the use of Al powder pre-alloyed with Fe/Ni additions is feasible for\npress-and-sinter PM technology and that the sintered product exhibits improved elevated\ntemperature stability under certain conditions.
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Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
Scores machine (provisoires)
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Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découle