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Effects of hyper-high-temperature solid-solution treatment on microstructure evolution and nanoprecipitation of the Al-Ni-Cu-Fe-Zr-Sc alloy manufactured by selective laser melting
- Source :
- Journal of Alloys and Compounds. 883:160781
- Publication Year :
- 2021
- Publisher :
- Elsevier BV, 2021.
-
Abstract
- The novel selective laser melting (SLM) Al-Ni-Cu-Fe-Zr-Sc alloy has high temperature stability, but the segregation of the melting pool boundary limits its potential applications. Because conventional heat treatment with a solid solution at 530 °C is inappropriate for the SLM Al-Ni-Cu-Fe-Zr-Sc alloy, this study used hyper-high-temperature solid-solution treatment at three temperatures (560, 570, and 580 °C for 1 h) to investigate the evolution of the melting pool structure. An artificial aging treatment was applied at 175 °C for 6 h to investigate the precipitation mechanism. The results indicated that as-printed presented a bimodal microstructure consisting of a coarse-grained (CG) region and a fine-grained (FG) region. The hyper-high-temperature solid-solution treatment promoted the decomposition of the melting pool boundary and expansion of FG region. The FG region was composed of Ni-, Cu-, and Fe-rich equiaxed grains. After aging treatment, Al9Fe(Cu)Ni and Al3(Sc, Zr) nano-scale strengthening phases could be found in the FG region. The decomposition of the melting pool boundary, bimodal microstructure, and nano-scale phases can strengthen the matrix and increase hardness. In addition, the mechanism of element diffusion in melting pool was also explored to confirm that heat treatment can reduce material deterioration caused by boundary precipitation. These characteristics mitigate the disadvantages of the SLM Al-Ni-Cu-Fe-Zr-Sc alloy in terms of its strength directionality and establish its potential for use in aerospace applications.
- Subjects :
- Equiaxed crystals
Materials science
Precipitation (chemistry)
Mechanical Engineering
Diffusion
Alloy
Metals and Alloys
02 engineering and technology
engineering.material
010402 general chemistry
021001 nanoscience & nanotechnology
Microstructure
01 natural sciences
Decomposition
0104 chemical sciences
Mechanics of Materials
Materials Chemistry
engineering
Selective laser melting
Composite material
0210 nano-technology
Solid solution
Subjects
Details
- ISSN :
- 09258388
- Volume :
- 883
- Database :
- OpenAIRE
- Journal :
- Journal of Alloys and Compounds
- Accession number :
- edsair.doi...........b07a0993499eb30b881b91fc98a53278