Study on the Phase Selection and Debye Temperature of Hyper-Peritectic Al-Ni Alloy under High Pressure
Abstract
:1. Introduction
2. Materials and Methods
3. Results and Discussion
4. Conclusions
- (1)
- The new diffraction peak of α-Al phase generates during solidification under high pressure.
- (2)
- A dendrite tip radius model for the growth of intermetallic compounds with nil solubility was established.
- (3)
- There is no constitutional undercooling that exists at the frontier of Al3Ni interface.
- (4)
- Peritectic Al3Ni2 phase nucleates and grows directly from the metastable liquid.
- (5)
- When Al-47wt%Ni alloy synthesized at high pressure, ΔTAlNi < ΔTAl3Ni2 < ΔTβ-Al3Ni.
- (6)
- The Debye temperatures of Al-47wt%Ni alloy synthesized at ambient pressure, 2 GPa and 4 GPa are 518.63 K, 524 K and 594.15 K, respectively.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Pressure | Phase Color | Ni wt.% |
---|---|---|
Ambient pressure | Gray | 42.8 |
White | 57.5 | |
2 GPa | Black | 1.03 |
Grey | 43.0 | |
White | 58.1 | |
3 GPa | Grey | 43.09 |
White | 60.04 | |
Black | 1.29 | |
4 GPa | Grey | 43.06 |
White | 60.52 | |
Black | 1.87 | |
Layer | 50.43 |
Physical Quantities | Al-47%Ni |
---|---|
Liquidus temperature TL(K) | 1392 |
Density (Alsolid) ρSAl (g/cm3) | 2.7 |
Density (Alliquid) ΡLAl (g/cm3) | 2.375 |
Density (Nisolid) ρSNi (g/cm3) | 8.908 |
Density (Niliquid) ΡLNi (g/cm3) | 7.81 |
κAl (W/m·K) | 235 |
ΚNi (W/m·K) | 91 |
Eutectic structure contact angle | – |
Liquidus slope of α, mLα (K/%) | −3.51 |
Liquidus slope of β, mLβ (K/%) | 18.5 |
mLAl3Ni2 (K/%) | 23.25 |
mLAlNi (K/%) | 29.8 |
DL (m2/s) | 0.78 × 10−7 × exp(−7.44 × 10−20/KBT) [30] |
Pressure (GPa) | βa (mJ/mol·K) | ΘD/K |
---|---|---|
0 | 0.01672 | 518.63 |
2 | 0.01621 | 524 |
4 | 0.01112 | 594.15 |
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Wang, X.; Chen, Z.; Dong, D.; Zhu, D.; Wang, H.; Wei, Z. Study on the Phase Selection and Debye Temperature of Hyper-Peritectic Al-Ni Alloy under High Pressure. Metals 2021, 11, 84. https://doi.org/10.3390/met11010084
Wang X, Chen Z, Dong D, Zhu D, Wang H, Wei Z. Study on the Phase Selection and Debye Temperature of Hyper-Peritectic Al-Ni Alloy under High Pressure. Metals. 2021; 11(1):84. https://doi.org/10.3390/met11010084
Chicago/Turabian StyleWang, Xiaohong, Zhipeng Chen, Duo Dong, Dongdong Zhu, Hongwei Wang, and Zunjie Wei. 2021. "Study on the Phase Selection and Debye Temperature of Hyper-Peritectic Al-Ni Alloy under High Pressure" Metals 11, no. 1: 84. https://doi.org/10.3390/met11010084