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Improving the Elevated-Temperature Properties by Two-Step Heat Treatments in Al-Mn-Mg 3004 Alloys

Liu Kun, Ma Hezhaoye et Chen X-Grant. (2018). Improving the Elevated-Temperature Properties by Two-Step Heat Treatments in Al-Mn-Mg 3004 Alloys. Metallurgical and Materials Transactions B, 49, (4), p. 1588-1596.

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In the present work, two-step heat treatments with preheating at different temperatures (175 °C, 250 °C, and 330 °C) as the first step followed by the peak precipitation treatment (375 °C/48 h) as the second step were performed in Al-Mn-Mg 3004 alloys to study their effects on the formation of dispersoids and the evolution of the elevated-temperature strength and creep resistance. During the two-step heat treatments, the microhardness is gradually increased with increasing time to a plateau after 24 hours when first treated at 250 °C and 330 °C, while there is a minor decrease with time when first treated at 175 °C. Results show that both the yield strength (YS) and creep resistance at 300 °C reach the peak values after the two-step treatment of 250 °C/24 h + 375 °C/48 h. The formation of dispersoids is greatly related to the type and size of pre-existing Mg2Si precipitated during the preheating treatments. It was found that coarse rodlike β′-Mg2Si strongly promotes the nucleation of dispersoids, while fine needle like β″-Mg2Si has less influence. Under optimized two-step heat treatment and modified alloying elements, the YS at 300 °C can reach as high as 97 MPa with the minimum creep rate of 2.2 × 10−9 s−1 at 300 °C in Al-Mn-Mg 3004 alloys, enabling them as one of the most promising candidates in lightweight aluminum alloys for elevated-temperature applications.

Type de document:Article publié dans une revue avec comité d'évaluation
Pages:p. 1588-1596
Version évaluée par les pairs:Oui
Identifiant unique:10.1007/s11663-018-1268-x
Sujets:Sciences naturelles et génie > Génie
Sciences naturelles et génie > Génie > Génie des matériaux et génie métallurgique
Sciences naturelles et génie > Sciences appliquées
Département, module, service et unité de recherche:Départements et modules > Département des sciences appliquées > Module d'ingénierie
Mots-clés:26 elevated-temperature properties, Al-Mn-Mg alloy, dispersoids, elevated temperature, elevated temperature strength, elevated-temperature applications, minimum creep rates, needle-like, nucleation, peak values, preheating treatments, two-step heat treatment
Déposé le:06 oct. 2023 14:50
Dernière modification:06 oct. 2023 14:50
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