Abstract
Ni-Cr-Al alloy was deposited by electron beam-physical vapor deposition (EB-PVD) method. The microstructure was investigated on as-deposited and long-term aged alloy. The results indicate that grain on surface of as-deposited alloy is about 185 nm in size, and a laminated structure in cross-section is observed. However, after aging for 16 and 120 h at 760°C, the laminated structure is dissolved, and the individual grain can be seen clearly. Columnar crystals form on the evaporation side, and exquiaxed grains form on the substrate side. The major precipitate is γ′ phase after prolonged aging at 760°C. Mechanical properties of the Ni-Cr-Al alloy were also studied. The results show that the fracture of as-deposited alloy has mixed type at room temperature, and intergranular fracture among columnar crystals is observed. Compared to that of as-deposited alloy, fracture of alloy after aging for 16 and 120 h at 760°C appears to involve ductile fracture with dimples.
| Original language | English |
|---|---|
| Pages (from-to) | 275-279 |
| Number of pages | 5 |
| Journal | Transactions of Nonferrous Metals Society of China (English Edition) |
| Volume | 15 |
| Issue number | 2 |
| State | Published - Apr 2005 |
Keywords
- Columnar crystal
- Mechanical properties
- Microstructure
- Ni-Cr-Al alloy
- Physical vapor deposition
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