Microstructure evolution, texture and laser surface HEACs of Al-Mg-Si alloy for light automobile parts

Abstract Effect of the rare earth (RE) elements and Cu on the microstructure performance and texture of the hot-rolled Al-Mg-Si alloys during the solution and artificial aging was investigated in this study. The results showed that Cube{100}〈001〉 and CubeND{001}〈310〉 textures were suppressed in a certain extent with the Ti/Zr addition, leading the Copper{112}〈111〉 and the {110}〈011〉 textures to be formed; the texture strength of Cube{100} increased with Ce/Er-added, also the F{111}〈112〉 texture was varied, the strength of {110}//ND decreased. The orientation density of the hot-rolled T6 Al-Mg-Si-Cu alloys increased with the Ce/Er addition, the nucleation mechanism of the re-crystallization was the Cube texture, also the nucleation mechanism of the Cube texture and PSN were weaken. Then, the mixed powders of FeCoCrAlCu (high-entropy alloy powder)-MoSi2-Mn-Sb were deposited on the produced hot-rolled Ce/Er modified Al-Mg-Si-Cu alloy substrate by mean of a laser melting deposition (LMD) technique to form the high-entropy alloy composites (HEACs) to improve the surface performance of alloy substrate. Identification of the synthetic ultrafine nanocrystals (UNs) in LMD HEACs contributes theoretical/experimental basis to improve the quality of the laser 3D print materials. The research on the texture of the hot-rolled Al-Mg-Si-Cu alloy also the Co3Mo2Si UNs in laser-treated HEACs can provide the essential theoretical/experimental basis to improve the quality of the light alloys for the automobile parts.