Special Features of Structure and Phase Transitions of Al – Fe – Cr Alloy under Different Crystallization Conditions in Additive Technologies

Логинова, И. С.; Sazera, M. V.; Kuskov, K. V.; Popov, N. A.; Khalil, A.; Солонин, А. Н.

doi:10.1007/s11041-022-00768-z

Cited by 1 publication

(1 citation statement)

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“…Mg (1.8 wt%), Cu (4.9 wt%), and Si (0.5 wt%) weight ratios make AA2024 exceptionally difficult to process. Furthermore, evaporation of the alloying elements (such as Mg, due to its low boiling point) may result in element loss, which brings the ratios of weight closer to the peak points of the relative crack sensitivity curves [21], increasing the relative crack sensitivity of the AA2024 alloy significantly. Al-Cu-Mg (2xxx) systems are basic for long and widely used wrought alloys.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Zirconium and Yttrium Addition on the Microstructure and Hardness of AlCuMgMn Alloy when Applying In Situ Heating during the Laser Melting Process

Khalil,

Pozdniakov,

Solonin

et al. 2023

Materials

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This paper studies the effect of the laser melting process (LMP) on the microstructure and hardness of a new modified AlCuMgMn alloy with zirconium (Zr) and Yttrium (Y) elements. Homogenized (480 °C/8 h) alloys were laser-surface-treated at room temperature and a heating platform with in situ heating conditions was used in order to control the formed microstructure by decreasing the solidification rate in the laser-melted zone (LMZ). Modifying the AlCuMgMn alloy with 0.4 wt% Zr and 0.6 wt% Y led to a decrease in grain size by 25% with a uniform grain size distribution in the as-cast state due to the formation of Al3(Y, Zr). The homogenization dissolved the nonequilibrium intermetallic phases into the (Al) matrix and spheroidized and fragmentized the equilibrium phase’s particles, which led to the solidification of the crack-free LM zone with a nonuniform grain structure. The microstructure in the LMZ was improved by using the in situ heating approach, which decreased the temperature gradient between the BM and the melt pool. Two different microstructures were observed: ultrafine grains at the boundaries of the melted pool due to the extremely high concentration of optimally sized Al3(Y, Zr) and fine equiaxed grains at the center of the LMZ. The combination of the presence of ZrY and applying a heating platform during the LMP increased the hardness of the LMZ by 1.14 times more than the hardness of the LMZ of the cast AlCuMgMn alloy.

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Section: Introductionmentioning

confidence: 99%