Tensile Properties and Corrosion Behavior of Extruded Low-Alloyed Mg–1Sn–1Al–1Zn Alloy: The Influence of Microstructural Characteristics
Abstract
:1. Introduction
2. Experimental Procedure
2.1. Specimen Preparation
2.2. Microstructural Characterization
2.3. Tensile Properties
2.4. Electrochemical Test
3. Results and Discussion
3.1. Microstructural Characteristics Prior to Corrosion
3.2. Phase Composition
3.3. Texture
3.4. Tensile Properties
3.5. Corrosion Tests in the Simulated Body Fluid (SBF) Solution
4. Conclusions
- (1)
- The average grain size of homogenized alloy was 121.07 ± 32.15 μm. After extrusion, the alloy exhibited a microstructure consisting of fine dynamically recrystallized (DRXed) grains of ~2.65 μm and coarse unDRXed grains with strong texture.
- (2)
- The extruded alloy showed a high YS of 259 MPa, UTS of 297 MPa, and EL of 19.0%, which was ascribed to the grain boundary, solid solution and texture strengthening as well as a moderate SF value.
- (3)
- The presence of non-basal grains in the extruded alloy accelerate the corrosion process of the present extruded low-alloyed Mg–Sn–Al–Zn alloy. In addition, the corrosion product film mainly consisted of MgO, Mg(OH)2 and MgCl2, which cannot protect the matrix effectively.
Author Contributions
Acknowledgments
Conflicts of Interest
References
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Specimen | Ecorr (Vsce) | icorr (mA/cm2) | βa (mV) | βc (mV) | Pi (mm/a) |
---|---|---|---|---|---|
As-extruded | −1.48 | 4.93 × 10−2 | 54.71 | 382.29 | 11.2 |
As-cast | −1.53 | 5.42 × 10−2 | 167.3 | 228.63 | 12.4 |
Specimen | RS (Ω cm2) | C1 (F/cm2) | RC (Ω cm2) | RL (Ω cm2) | L1 (H/cm2) | RP (Ω cm2) | |
---|---|---|---|---|---|---|---|
C1 | n | ||||||
As-extruded | 9.741 | 6.818 × 10−6 | 0.995 | 526.5 | 187.7 | 417.1 | 723.94 |
As-cast | 1.663 | 5.655 × 10−5 | 0.852 | 110.3 | 75.46 | 6.77 | 187.33 |
Specimen | Ecorr (Vsce) | icorr (mA/cm2) | βa (mV) | βc (mV) | Pi (mm/a) |
---|---|---|---|---|---|
5 min | −1.49 | 4.83 × 10−2 | 66.74 | 270.19 | 11.0 |
20 min | −1.43 | 2.93 × 10−2 | 62.40 | 348.26 | 6.6 |
40 min | −1.46 | 4.12 × 10−2 | 77.62 | 211.71 | 9.4 |
1 h | −1.49 | 4.80 × 10−2 | 80.06 | 252.76 | 10.9 |
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Cheng, W.; Zhang, Y.; Ma, S.; Arthanari, S.; Cui, Z.; Wang, H.-x.; Wang, L. Tensile Properties and Corrosion Behavior of Extruded Low-Alloyed Mg–1Sn–1Al–1Zn Alloy: The Influence of Microstructural Characteristics. Materials 2018, 11, 1157. https://doi.org/10.3390/ma11071157
Cheng W, Zhang Y, Ma S, Arthanari S, Cui Z, Wang H-x, Wang L. Tensile Properties and Corrosion Behavior of Extruded Low-Alloyed Mg–1Sn–1Al–1Zn Alloy: The Influence of Microstructural Characteristics. Materials. 2018; 11(7):1157. https://doi.org/10.3390/ma11071157
Chicago/Turabian StyleCheng, Weili, Yao Zhang, Shichao Ma, Srinivasan Arthanari, Zeqin Cui, Hong-xia Wang, and Lifei Wang. 2018. "Tensile Properties and Corrosion Behavior of Extruded Low-Alloyed Mg–1Sn–1Al–1Zn Alloy: The Influence of Microstructural Characteristics" Materials 11, no. 7: 1157. https://doi.org/10.3390/ma11071157