Grain Size-Related Strengthening and Softening of a Precompressed and Heat-Treated Mg–Zn–Ca Alloy
Abstract
:1. Introduction
2. Materials and Methods
- Compression of the as-extruded state
- Tension of the as-extruded state
- Compression of heat-treated (16 h @ 150 °C) samples
- Tension of heat-treated (16 h @ 150 °C) samples
- Furthermore, samples have been precompressed up to 3% of plastic strain and subjected to
- Compression
- Tension
- A heat treatment of 16 h @ 150 °C followed by compression
- A heat treatment of 16 h @ 150 °C followed by tension
3. Results
4. Discussion
4.1. Effect of Extrussion Parameters
4.2. Effect of Heat Tratment
4.3. Effect of Precompression
4.4. Effect of Precompression and Heat Treatment
5. Conclusions
- Heat treatment (HT) at 150 °C for 16 h leads to strengthening and consequently to a slight increase in stress compared to the as-extruded condition within observed grain size interval.
- However, using HT after precompression, the strengthening effect is significantly higher compared to that observed after HT of extruded bars.
- At the same time, HT reduces the impact of detwinning on yielding during reversed tensile loading.
- Precompression up to 3% of plastic strain slightly decreased the compressive yield strength and distinctly reduced the tensile yield strength in comparison with the initial state. However, the Hall–Petch plot is similar throughout the observed grain size interval for both loading conditions.
- The strengthening effect caused by heat treatment applied after precompression is more pronounced in tension than in compression without any change in the Hall–Petch slope throughout the observed grain size interval. Thus, there is no grain size dependence of strengthening.
- Deformation-thermal processing leads to reverse tensile–compression yield asymmetry with higher strength values in compression. By comparison of the yield strength in the initial state with that observed after deformation-thermal processing, it is evident that the increasing grain size has a positive effect on compressive yield strength and also reduces negative effect on tensile yield strength due to the twinning–detwinning process.
Author Contributions
Funding
Conflicts of Interest
References
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Designation | As-Extruded | Heat-Treated | Precompressed | Precompressed and Heat-Treated |
---|---|---|---|---|
ZX10-04 | 29 | 27 | −83 | −46 |
ZX10-11 | 34 | 31 | −60 | −55 |
ZX10–23 | 48 | 46 | −62 | −48 |
ZX10–53 | 39 | 36 | −62 | −43 |
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Dobroň, P.; Drozdenko, D.; Horváth Fekete, K.; Olejňák, J.; Bohlen, J. Grain Size-Related Strengthening and Softening of a Precompressed and Heat-Treated Mg–Zn–Ca Alloy. Materials 2020, 13, 351. https://doi.org/10.3390/ma13020351
Dobroň P, Drozdenko D, Horváth Fekete K, Olejňák J, Bohlen J. Grain Size-Related Strengthening and Softening of a Precompressed and Heat-Treated Mg–Zn–Ca Alloy. Materials. 2020; 13(2):351. https://doi.org/10.3390/ma13020351
Chicago/Turabian StyleDobroň, Patrik, Daria Drozdenko, Klaudia Horváth Fekete, Juraj Olejňák, and Jan Bohlen. 2020. "Grain Size-Related Strengthening and Softening of a Precompressed and Heat-Treated Mg–Zn–Ca Alloy" Materials 13, no. 2: 351. https://doi.org/10.3390/ma13020351