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Sequential precipitation behavior of Mg17Al12 and Mg2Sn in Mg-8Al-2Sn-1Zn alloys

TitleSequential precipitation behavior of Mg17Al12 and Mg2Sn in Mg-8Al-2Sn-1Zn alloys
Publication TypeJournal Article
Year of Publication2018
AuthorsJo, SM, Kim, SD, Kim, TH, Go, Y, Yang, CW, You, BS, Kim, YM
JournalJournal of Alloys and Compounds
Volume749
Pagination794-802
Date Published06
Type of ArticleArticle
ISBN Number0925-8388
Accession NumberWOS:000432666200094
Keywordsage-hardening response, Aging, aging behavior, al-based alloys, az91 magnesium alloy, chemistry, magnesium alloys, Materials Science, mechanical-properties, Metallurgical Engineering, mg-sn alloys, Mg17Al12, Mg2Sn, migration mechanisms, multivariant beta-mg17al12, phase-field simulation, precipitation, zn alloy
Abstract

The precipitation behavior of Mg-8Al-2Sn-1Zn (ATZ821) alloy was investigated. Sn addition to the AZ81 alloy greatly influenced the initial precipitation behavior in the following two aspects: (i) the segregation of Sn solutes at the interface of Mg17Al12 via Sn partitioning induced during the growth of Mg17Al12 and (ii) high interfacial energy at the edge-tip of growing Mg17Al12. According to the hardness profile and detailed microstructural analyses of ATZ821 cast samples artificially aged at 453 K for different times, it was confirmed that the initial precipitation of Mg17Al12 was delayed due to Sn partitioning at the interface, and all Mg2Sn without exception was nucleated at the edge-tip of pre-existing Mg17Al12 precipitates on the basal planes. In addition, a selected area diffraction pattern analysis confirmed that alpha-Mg, Mg17Al12, and Mg2Sn had the following orientation relationship: (0001)(alpha)//(110)(Mg17Al12), [1 (2) over bar 10]alpha//[(1) over bar 11](Mg17Al12) and (0001)(alpha)//(022)Mg2Sn, [1 (2) over bar 10](alpha)//[1 (1) over bar1](Mg2Sn). (C) 2018 Elsevier B.V. All rights reserved.

DOI10.1016/j.jallcom.2018.03.380
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