Refinement of Recrystallized Grain Structure in Al-Mn-Mg Alloy Sheets via Strip Casting

Suzuki, Yoshikazu; Hashimoto, Takeyoshi; Muramatsu, Tadashi

doi:10.4028/www.scientific.net/msf.396-402.113

Cited by 1 publication

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“…The equilibrium solubility of Mn in Al is limited by 0.62 at.% [24]. Meanwhile, the solute increases to 1-1.3 at.% Mn for continuous and electromagnetic casting [25][26][27][28], and up to 2-2.5 at.% for rapid solidification, like granular technologies and melt-spun ribbons [24,29]. An anomalously supersaturated solid solution with 7.5 at.% is observed for Al-Mn alloys prepared by electrodeposition from an ionic liquid [30].…”

Section: Introductionmentioning

confidence: 99%

Effect of Mechanical Alloying on the Dissolution of the Elemental Mn and Al-Mn Compound in Aluminum

Yakovtseva,

Emelina,

Mochugovskiy

et al. 2023

Metals

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The grain boundary, solid solution, and precipitation strengthening mechanisms are important for controlling the mechanical properties of Al-based alloys. Due to severe plastic deformation, mechanical alloying refines grain structure to a nanoscale level which leads to a strong increase in solute content and the related strengthening effect of solute atoms and secondary-phase precipitates. This study analyzed the elemental Mn and Al6Mn phase dissolution in Al during high-energy ball milling. For this purpose, XRD data, microstructure, and hardness evolutions were compared for two Al—5.2 at% Mn alloys prepared by mechanical alloying using elemental Al and Mn powders and a pre-melted master alloy. In the two-phase master alloy, containing the Al solid solution and the Al6Mn phase, the strain accumulation, grain refinement, solid solution supersaturation, and milling-induced hardening effects were facilitated. Both elemental Mn and intermetallic compound were dissolved during mechanical alloying, and the maximum solute content was near 3.1 at% Mn. A fine crystalline size of ~25 nm and the maximum Mn solute content were observed after milling of elemental powders and the master alloy for 60 h and 20 h, respectively. The microhardness of ~3 GPa corresponded to a ~3.1% solute Mn content, and the microhardness increased to ~5 GPa after long–term milling due to precipitation strengthening effect of the secondary Al6Mn phase in the master alloy.

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