Physical and Structural Characterization of Monocrystalline Cu-13.7% Al-4.2% Ni Alloy Submitted to Thermo-Cyclical Treatments under Applied Loads
Abstract
:1. Introduction
2. Materials and Methods
3. Results
3.1. Analysis of the Monocrystalline Cu-13.7% Al-4.2% Ni Alloy in the Initial State
3.2. Differential Scanning Calorimetry of the Monocrystalline Cu-13.7% Al-4.2% Ni Alloy after TCT under Loads
3.2.1. Reverse RMT Curves during the First Cycle of DSC Analysis
3.2.2. Direct and Reverse RMT of the Monocrystalline Cu-13.7% Al-4.2% Ni Alloy Curves after TCT under Loads
3.3. XRD Analysis of the Monocrystalline Cu-13.7% Al-4.2% Ni Alloy after TCT under Load
3.3.1. XRD Analysis after TCT under Loading of 0.11 MPa Ending with the ½ Cooling Cycle
3.3.2. XRD Analysis after TCT under Loading of 0.11 MPa Ending with ½ Heating Cycle
3.3.3. XRD Analysis after TCT under Loading of 0.26 MPa Ending with ½ Cooling Cycle
3.3.4. XRD Analysis after TCT under Loading of 0.26 MPa Ending with ½ Heating Cycle
3.3.5. XRD Analysis after TCT under Loading of 0.53 MPa Ending with ½ Cooling Cycle
3.3.6. XRD Analysis after TCT under Loading of 0.53 MPa Ending with ½ Heating Cycle
3.4. Optical Microscopy after TCT under Loading
3.5. Vickers Microhardness after TCT under Loads
4. Discussion
5. Conclusions
- The monocrystalline Cu-13.7% Al-4.2% Ni alloy represents complex mixed transformation, revealing the RMT sequence β1 ↔ R ↔ β′1 + γ′1, where the present phases are coherent with each other and are very sensitive to structural changes.
- Alterations in the alloy structure by finishing the ½ cycle heating treatment (TA → 90 °C → TA) show good consistency with the critical temperatures of direct RMT. The martensite γ′1 field lies below the end of the intensive direct RMT (below Mof). Above this temperature, a greater participation of martensite β′1 is observed, coherent to phase R.
- The participation of the high-temperature phase β1 in the alloy structure, mainly after TCTs under the load of 0.26 MPa, appears as a response of the load applied during the treatment which promotes partially the reverse RMT γ′1 + β′1 → R → β1.
- During TCTs performed under optimized load (0.26 MPa), where the RMT range was not changed, the reorientation, hardening, and stabilization of the structure during RMT occur more intensively, resulting in a reduction of critical intervals, increasing and stabilizing of the microhardness, from 300 thermal cycles.
- The changes in the main RMT parameters of monocrystalline Cu-13.7% Al-4.2% Ni alloy during TCT under load are not very significant, especially after complete RMT cycles, which indicate good resistance of the alloy investigated to irreversible changes, making its practical use feasible.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Matlakhova, L.A.; Pereira, E.C.; Pulnev, S.A.; Shigue, C.Y.; Palii, N.A. Physical and Structural Characterization of Monocrystalline Cu-13.7% Al-4.2% Ni Alloy Submitted to Thermo-Cyclical Treatments under Applied Loads. Metals 2020, 10, 219. https://doi.org/10.3390/met10020219
Matlakhova LA, Pereira EC, Pulnev SA, Shigue CY, Palii NA. Physical and Structural Characterization of Monocrystalline Cu-13.7% Al-4.2% Ni Alloy Submitted to Thermo-Cyclical Treatments under Applied Loads. Metals. 2020; 10(2):219. https://doi.org/10.3390/met10020219
Chicago/Turabian StyleMatlakhova, Lioudmila A., Elaine C. Pereira, Serguey A. Pulnev, Carlos Y. Shigue, and Natalia A. Palii. 2020. "Physical and Structural Characterization of Monocrystalline Cu-13.7% Al-4.2% Ni Alloy Submitted to Thermo-Cyclical Treatments under Applied Loads" Metals 10, no. 2: 219. https://doi.org/10.3390/met10020219