Phase control and formation mechanism of Al–Mn(–Fe) intermetallic particles in Mg–Al-based alloys with FeCl3 addition or melt superheating. (1st August 2016)

• Record Type: Journal Article
• Authors: Han, Guang; Liu, Xiangfa
• Is Part Of: Acta materialia. Volume 114(2016)
• Page Start: 54
• Page End: 66
• Publication Date: 2016-08-01
• Subjects: Magnesium alloys -- Intermetallics -- τ-Al0.89Mn1.11 -- γ2-Al8Mn5; Materials -- Periodicals; Materials science -- Periodicals; Materials -- Mechanical properties -- Periodicals; Metallurgy -- Periodicals; Chemistry, Inorganic -- Periodicals; 620.112
• DOI: 10.1016/j.actamat.2016.05.012
• Languages: English
• ISSNs: 1359-6454

Abstract

Abstract: In this study, we identify the crystal structures and elucidate the formation mechanism of Al–Mn(–Fe) intermetallic particles formed in Mg–Al-based alloys with varied Al contents, FeCl3 addition or melt superheating. The formed Al–Mn(–Fe) particles were collected through a newly developed particle extraction method for structural, chemical and morphological characterizations. It is found that increasing the Al content from 3 wt% to 9 wt% changes the major Al–Mn phase from τ-Al0.89 Mn1.11 in AZ31 to γ2 -Al8 Mn5 in AZ91, and both FeCl3 addition and melt superheating promote the formation of γ2 -Al8 (Mn, Fe)5 in AZ31 and AZ63. In addition, through tuning FeCl3 addition level or melt superheating temperature, different morphologies of the γ2 -Al8 (Mn, Fe)5 particles are formed in AZ31 and AZ63, including quasi-cubes, octa-pod microstructures and polyhedral particles. This study provides several important approaches to control the crystal structure and morphology of Al–Mn(–Fe) intermetallic particles formed in Mg–Al-based alloys. Graphical abstract: